BE-FAQ - Bearing measurement marks - Revision history

Rcollins at 23:13, 3 June 2023

2023-06-03T23:13:03Z

← Older revision		Revision as of 23:13, 3 June 2023
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	Q: Has BE Bearings always measured their shells?<br>		Q: Has BE Bearings always measured their shells?<br>
	A: Yes. Since the ~~very beginning in 2015~~, BE Bearings has always measured their shells.		A: Yes, kind of. Since the second batch received, BE Bearings has always measured their shells.
	#In 2015, the first shells were measured with a Mitutoyo ball-anvil micrometer. This device seemed like a good idea, but proved too time consuming and did not produce repeatable results. Measuring each shell took approximately 21 seconds.		#In 2015, the first shells were measured with a Mitutoyo ball-anvil micrometer. This device seemed like a good idea, but proved too time consuming and did not produce repeatable results. Measuring each shell took approximately 21 seconds.
	#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.		#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.

Rcollins at 22:09, 28 March 2023

2023-03-28T22:09:08Z

← Older revision		Revision as of 22:09, 28 March 2023
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	During the measuring process, after they are measured, each shell is sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.		During the measuring process, after they are measured, each shell is sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.

			All bearings measured with the new Mahr air gauge will not have marks on them. See the Q&A below for an explanation. These bearings are only available after March, 2023.

	'''Q&A:'''		'''Q&A:'''

Rcollins at 22:07, 28 March 2023

2023-03-28T22:07:46Z

← Older revision		Revision as of 22:07, 28 March 2023
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	#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.		#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.
	#More recently, the ball-shaped tip was replaced with a rounded roller bearing. The roller bearing does not scrape the bearing surface, but does still leave visible marks. There are no harm caused by these marks and they cannot be felt by your fingers or measured with any device that you may have. Measuring each shell takes approximately 6.0 seconds.		#More recently, the ball-shaped tip was replaced with a rounded roller bearing. The roller bearing does not scrape the bearing surface, but does still leave visible marks. There are no harm caused by these marks and they cannot be felt by your fingers or measured with any device that you may have. Measuring each shell takes approximately 6.0 seconds.
	#Starting March 2023, a new device will be used. A custom-made Mahr air gage will be used to measure BE Bearings. This new device is accurate to 0.0000005 inch, with resolution. Bearings will be measured to 0.00001 inch (1/100,000 of an inch) and rounded up to 0.00005 for sorting and binning parts. This new air gage will use differential air pressure to measure the bearing thicknesses. The new air gage be able to measure, sort, and bin each shell in approximately 6.5 - 7.0 seconds.		#Starting March 2023, a new device will be used. A custom-made Mahr air gage will be used to measure BE Bearings. This new device is accurate to 0.0000005 inch, with resolution. Bearings will be measured to 0.00001 inch (1/100,000 of an inch) and rounded up to 0.00005 for sorting and binning parts. This new air gage will use differential air pressure to measure the bearing thicknesses. The new air gage be able to measure, sort, and bin each shell in approximately 6.5 - 7.0 seconds.<br>
	Q: Now that I'm used to seeing these measurement marks on my bearings, why don't my new bearings have any marks on them? Did BE forget to measure them?
	A: All bearings measured after March, 2023 will not have marks on them. The new Mahr air gage does not leave any marks. BE did not forget to measure them.		Q: Now that I'm used to seeing these measurement marks on my bearings, why don't my new bearings have any marks on them? Did BE forget to measure them?<br>
			A: All bearings measured after March, 2023 will not have marks on them. The new Mahr air gage does not leave any marks. BE did not forget to measure them.<br>

Rcollins at 22:07, 28 March 2023

2023-03-28T22:07:12Z

← Older revision		Revision as of 22:07, 28 March 2023
Line 18:		Line 18:
	#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.		#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.
	#More recently, the ball-shaped tip was replaced with a rounded roller bearing. The roller bearing does not scrape the bearing surface, but does still leave visible marks. There are no harm caused by these marks and they cannot be felt by your fingers or measured with any device that you may have. Measuring each shell takes approximately 6.0 seconds.		#More recently, the ball-shaped tip was replaced with a rounded roller bearing. The roller bearing does not scrape the bearing surface, but does still leave visible marks. There are no harm caused by these marks and they cannot be felt by your fingers or measured with any device that you may have. Measuring each shell takes approximately 6.0 seconds.
	#Starting ~~late 2022~~, a new device will be used. A custom-made Mahr air gage will be used to measure BE Bearings. This new device is accurate to 0.~~000002~~ inch, with resolution to 0.~~000001~~ inch (1/~~1,000~~,000 of an inch). This new air gage will use differential air pressure to measure the bearing thicknesses. ~~It's unknown how much time it will take~~ to measure each shell ~~with this technique, but it should be~~ approximately 6.0 - 7.0 seconds.		#Starting March 2023, a new device will be used. A custom-made Mahr air gage will be used to measure BE Bearings. This new device is accurate to 0.0000005 inch, with resolution. Bearings will be measured to 0.00001 inch (1/100,000 of an inch) and rounded up to 0.00005 for sorting and binning parts. This new air gage will use differential air pressure to measure the bearing thicknesses. The new air gage be able to measure, sort, and bin each shell in approximately 6.5 - 7.0 seconds.
			Q: Now that I'm used to seeing these measurement marks on my bearings, why don't my new bearings have any marks on them? Did BE forget to measure them?
			A: All bearings measured after March, 2023 will not have marks on them. The new Mahr air gage does not leave any marks. BE did not forget to measure them.

Rcollins at 04:58, 4 July 2022

2022-07-04T04:58:12Z

Rcollins at 00:20, 4 July 2022

2022-07-04T00:20:00Z

← Older revision		Revision as of 00:20, 4 July 2022
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	Let me explain why BE Bearings have marks on the surface.		Let me explain why BE Bearings have marks on the surface.

	Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a rounded roller bearing tip. The roller bearing tip is like a wheel that rolls over the surface of the bearing while it measures the bearing thickness. This process leaves a very small mark on the surface of the bearing. The marks that this process leaves are totally harmless, and you will never be able to fill them with your fingers or even measurement with another device.		Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a rounded roller bearing tip (P/N: 543-562ACAL). The roller bearing tip is like a wheel that rolls over the surface of the bearing while it measures the bearing thickness. This process leaves a very small mark on the surface of the bearing. The marks that this process leaves are totally harmless, and you will never be able to fill them with your fingers or even measurement with another device.

	As the shells are hand measured, they are sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\|take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.		As the shells are hand measured, they are sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\|take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.
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	Q: What if I want a set that doesn't have these marks? Can I get a set that isn't measured?<br>		Q: What if I want a set that doesn't have these marks? Can I get a set that isn't measured?<br>
	A: Yes, upon special request, you may obtain a set of bearings that are not measured. We do not advise to do this. Since the issue of the S65 bearing clearances is exacerbated by tolerance stacking, measuring, sorting, binning, and creating matched set of bearings is the only way to eliminate the bearings themselves from contributing to the bearing clearance problem. If you do decide that you want a set that hasn't been measured, then you will be giving up the engine replacement warranty offered by BE Bearings. That engine replacement warranty is described [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_BE_Bearings_Engine_Replacement_Warranty\| here].		A: Yes, upon special request, you may obtain a set of bearings that are not measured. We do not advise to do this. Since the issue of the S65 bearing clearances is exacerbated by tolerance stacking, measuring, sorting, binning, and creating matched set of bearings is the only way to eliminate the bearings themselves from contributing to the bearing clearance problem. If you do decide that you want a set that hasn't been measured, then you will be giving up the engine replacement warranty offered by BE Bearings. That engine replacement warranty is described [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_BE_Bearings_Engine_Replacement_Warranty\| here].

			Q: Has BE Bearings always measured their shells?<br>
			A: Yes. Since the very beginning in 2015, BE Bearings has always measured their shells.
			#The first devices as a Mitutoyo ball-anvil micrometer. This device seemed like a good idea, but proved too time consuming and did not produce repeatable results. Measuring each shell took approximately 21 seconds.
			#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.
			#More recently, the ball-shaped tip has been replaced with a ball-shaped roller bearing. The roller bearing does not scrape the bearing surface, but does still leave visiable marks. There are no harm caused by these marks and they cannot be felt by your fingers or measured with any device that you may have. Measuring each shell takes approximately 6.0 seconds.
			#Starting late 2022, a new device will be used. A custom-made Mahr air gage will be used. This new device is accurate to 0.000002 inch, with resolution to 0.000001 inch. This new air gage will use differential air pressure to measure the bearing thicknesses. It's unknown how much time it will take to measure each shell with this technique, but it should be approximately 6.0 - 7.0 seconds.

Rcollins at 23:24, 3 July 2022

2022-07-03T23:24:58Z

← Older revision		Revision as of 23:24, 3 July 2022
Line 5:		Line 5:
	As the shells are hand measured, they are sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\|take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.		As the shells are hand measured, they are sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\|take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.

	Q&A:		'''Q&A:'''
	Q: Does this process hurt the bearings?
			Q: Does this process hurt the bearings?<br>
	A: No, the marks are only on the surface and do not cause any damage to the shells. You can't even feel them or measure them with another devices.		A: No, the marks are only on the surface and do not cause any damage to the shells. You can't even feel them or measure them with another devices.

	Q: What if I want a set that doesn't have these marks? Can I get a set that isn't measured?		Q: What if I want a set that doesn't have these marks? Can I get a set that isn't measured?<br>
	A: Yes, upon special request, you may obtain a set of bearings that are not measured. We do not advise to do this. Since the issue of the S65 bearing clearances is exacerbated by tolerance stacking, measuring, sorting, binning, and creating matched set of bearings is the only way to eliminate the bearings themselves from contributing to the bearing clearance problem. If you do decide that you want a set that hasn't been measured, then you will be giving up the engine replacement warranty offered by BE Bearings. That engine replacement warranty is described here:		A: Yes, upon special request, you may obtain a set of bearings that are not measured. We do not advise to do this. Since the issue of the S65 bearing clearances is exacerbated by tolerance stacking, measuring, sorting, binning, and creating matched set of bearings is the only way to eliminate the bearings themselves from contributing to the bearing clearance problem. If you do decide that you want a set that hasn't been measured, then you will be giving up the engine replacement warranty offered by BE Bearings. That engine replacement warranty is described [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_BE_Bearings_Engine_Replacement_Warranty\| here].

Rcollins at 23:10, 3 July 2022

2022-07-03T23:10:41Z

← Older revision		Revision as of 23:10, 3 July 2022
Line 3:		Line 3:
	Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a rounded roller bearing tip. The roller bearing tip is like a wheel that rolls over the surface of the bearing while it measures the bearing thickness. This process leaves a very small mark on the surface of the bearing. The marks that this process leaves are totally harmless, and you will never be able to fill them with your fingers or even measurement with another device.		Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a rounded roller bearing tip. The roller bearing tip is like a wheel that rolls over the surface of the bearing while it measures the bearing thickness. This process leaves a very small mark on the surface of the bearing. The marks that this process leaves are totally harmless, and you will never be able to fill them with your fingers or even measurement with another device.

	As the shells are hand measured, they are sorted and placed in bins ~~with~~ 0.00005 inch ~~differences~~. The measuring, sorting, and binning allows us to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. ~~Each~~		As the shells are hand measured, they are sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\|take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.

			Q&A:
			Q: Does this process hurt the bearings?
			A: No, the marks are only on the surface and do not cause any damage to the shells. You can't even feel them or measure them with another devices.

			Q: What if I want a set that doesn't have these marks? Can I get a set that isn't measured?
			A: Yes, upon special request, you may obtain a set of bearings that are not measured. We do not advise to do this. Since the issue of the S65 bearing clearances is exacerbated by tolerance stacking, measuring, sorting, binning, and creating matched set of bearings is the only way to eliminate the bearings themselves from contributing to the bearing clearance problem. If you do decide that you want a set that hasn't been measured, then you will be giving up the engine replacement warranty offered by BE Bearings. That engine replacement warranty is described here:

Rcollins: Created page with "Let me explain why BE Bearings have marks on the surface. Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a round..."

2022-07-03T22:53:19Z

Created page with "Let me explain why BE Bearings have marks on the surface. Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a round..."

New page

Let me explain why BE Bearings have marks on the surface.

Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a rounded roller bearing tip. The roller bearing tip is like a wheel that rolls over the surface of the bearing while it measures the bearing thickness. This process leaves a very small mark on the surface of the bearing. The marks that this process leaves are totally harmless, and you will never be able to fill them with your fingers or even measurement with another device.

As the shells are hand measured, they are sorted and placed in bins with 0.00005 inch differences. The measuring, sorting, and binning allows us to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. Each

← Older revision		Revision as of 04:58, 4 July 2022
Line 1:		Line 1:
	Let me explain why BE Bearings have marks on the surface.		Let me explain why BE Bearings have marks on the surface.

	Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a rounded roller bearing tip (P/N: 543-562ACAL). The roller bearing tip is like a wheel that rolls over the surface of the bearing while it measures the bearing thickness. This process leaves a ~~very small~~ mark on the surface of the bearing. The marks ~~that~~ this process ~~leaves~~ are totally harmless, and you will never be able to ~~fill~~ them with your fingers or ~~even measurement~~ with ~~another~~ device.		Every BE Bearing is hand measured. The measurement process uses a data logging Mitutoyo drop indicator with a rounded roller bearing tip (P/N: 543-562ACAL). The roller bearing tip is like a wheel that rolls over the surface of the bearing while it measures the bearing thickness. This process leaves a visible mark on the surface of the bearing. The marks left by this process are totally harmless, and you will never be able to feel them with your fingers or measure them with a measuring device.

	As the ~~shells~~ are ~~hand~~ measured, ~~they are~~ sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\|take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.		During the measuring process, after they are measured, each shell is sorted and placed in bins according to every 0.00005 inch difference. The measuring, sorting, and binning allows us to [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| take advantage of the normal distribution curve of bearing thicknesses] to create perfectly matched sets of bearings for each customer. Once the bearings are sorted and binned, they are then used to create matched sets. [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_Mixed_sets_of_STD/%2B025_shells\| This article] describes how we mix and match individual shells to create perfectly matched sets of bearings.

	'''Q&A:'''		'''Q&A:'''

	Q: Does this process hurt the bearings?<br>		Q: Does this process hurt the bearings?<br>
	A: No, the marks are only on the surface and do not cause any damage to the shells. You can't even feel them or measure them with ~~another~~ devices.		A: No, the marks are only on the surface and do not cause any damage to the shells. You can't even feel them or measure them with other measuring devices.

	Q: What if I want a set that doesn't have these marks? Can I get a set that isn't measured?<br>		Q: What if I want a set that doesn't have these marks? Can I get a set that isn't measured?<br>
	A: Yes, upon special request, you may obtain a set of bearings that are not measured. We do not advise ~~to do~~ this. Since the issue of the S65 bearing clearances is exacerbated by tolerance stacking, measuring, sorting, binning, and creating matched set of bearings is the only way to eliminate the bearings themselves from contributing to the bearing clearance problem. If you do decide that you want a set that hasn't been measured, then you will be giving up the engine replacement warranty offered by BE Bearings. That engine replacement warranty is described [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_BE_Bearings_Engine_Replacement_Warranty\| here].		A: Yes, upon special request, you may obtain a set of bearings that are not measured. However, you might wait a while because all shells are measured when they arrive, and you would have to wait until a future shipment to obtain an unmeasured set. We do not advise doing this. Since the issue of the S65 bearing clearances is exacerbated by tolerance stacking, measuring, sorting, binning, and creating matched set of bearings is the only way to eliminate the bearings themselves from contributing to the bearing clearance problem. If you do decide that you want a set of BE Bearings that hasn't been measured, then you will be giving up the engine replacement warranty offered by BE Bearings. That engine replacement warranty is described [http://wiki.rcollins.org/core/index.php?title=BE-FAQ_-_BE_Bearings_Engine_Replacement_Warranty\| here].

	Q: Has BE Bearings always measured their shells?<br>		Q: Has BE Bearings always measured their shells?<br>
	A: Yes. Since the very beginning in 2015, BE Bearings has always measured their shells.		A: Yes. Since the very beginning in 2015, BE Bearings has always measured their shells.
	#~~The~~ first ~~devices as~~ a Mitutoyo ball-anvil micrometer. This device seemed like a good idea, but proved too time consuming and did not produce repeatable results. Measuring each shell took approximately 21 seconds.		#In 2015, the first shells were measured with a Mitutoyo ball-anvil micrometer. This device seemed like a good idea, but proved too time consuming and did not produce repeatable results. Measuring each shell took approximately 21 seconds.
	#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.		#The second device was a Mitutoyo 543-562A drop indicator with a ball-shaped tip. This device is accurate to 0.00005 inch with resolution to 0.00002 inch. This device has been used since 2017. This device proved very reliable and repeatable. The ball-shaped tip seemed to scrape the shells a little more than desired and was eventually replaced. Measuring each shell took approximately 7.5 seconds.
	#More recently, the ball-shaped tip ~~has been~~ replaced with a ~~ball-shaped~~ roller bearing. The roller bearing does not scrape the bearing surface, but does still leave ~~visiable~~ marks. There are no harm caused by these marks and they cannot be felt by your fingers or measured with any device that you may have. Measuring each shell takes approximately 6.0 seconds.		#More recently, the ball-shaped tip was replaced with a rounded roller bearing. The roller bearing does not scrape the bearing surface, but does still leave visible marks. There are no harm caused by these marks and they cannot be felt by your fingers or measured with any device that you may have. Measuring each shell takes approximately 6.0 seconds.
	#Starting late 2022, a new device will be used. A custom-made Mahr air gage will be used. This new device is accurate to 0.000002 inch, with resolution to 0.000001 inch. This new air gage will use differential air pressure to measure the bearing thicknesses. It's unknown how much time it will take to measure each shell with this technique, but it should be approximately 6.0 - 7.0 seconds.		#Starting late 2022, a new device will be used. A custom-made Mahr air gage will be used to measure BE Bearings. This new device is accurate to 0.000002 inch, with resolution to 0.000001 inch (1/1,000,000 of an inch). This new air gage will use differential air pressure to measure the bearing thicknesses. It's unknown how much time it will take to measure each shell with this technique, but it should be approximately 6.0 - 7.0 seconds.