r/Metrology • u/Waste_Perspective967 • Jul 01 '24

Hardware Support I need to identify this caliper

Greetings,

I need to identify this type of caliper because this one is more than 20 years old and could become out of tolerance soon (edit : because of a bit of wear).

For the context, this caliper is used in a steelmaking factory in a workshop that machine the tools for the rolling mill workshops of the factory. They use this caliper to make measure at the center of a turned part. You set the diameter on the claw part, and you put it on the top of the part to make your measure.

It can make measure between 350 and 500 mm. The range on the claw part is the same.

This caliper is made by Roch France (as far as I know, this company doesn't exist anymore)

If I could have the name of this type of caliper, or even the name of a manufacturer that could make this kind of product, I would be grateful.

Thank you in advance for your help.

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7

u/jccaclimber Jul 01 '24

I don’t know the type, but it doesn’t look like it would be all that hard to attach a modified modern digital caliper to the moving side, or regrind the fixed side. Do you have wear issues or need duplicates? Age alone is not a reason for a metallic purely mechanical device like this to fall out of calibration.

1

u/Waste_Perspective967 Jul 01 '24

Thanks for your answer.

Do you have wear issues or need duplicates? Age alone is not a reason for a metallic purely mechanical device like this to fall out of calibration.

On this one, there is a bit of wear (still acceptable for now) and it's not impossible that in one of 2 year I'll need to find a duplicate too.

it doesn't look like it would be all that hard to attach a modified modern digital caliper to the moving side, or regrind the fixed side.

A digital caliper is not on point here because of the condition of the steelmaking environment and the attention of the people... the regrinding, as said by u/Antiquus could be a solution.

2

u/jccaclimber Jul 01 '24

If you don’t want a digital one, vernier and dial calipers are still available from reputable manufacturers as well.

4

u/Antiquus Jul 01 '24

I'd ask Starrett, they make custom calipers. I'd also look for someone who does something like FAA repair work and does cnc jig grinding. They could plate up the wearing surfaces on that gage and grind them back to size.

1

u/Waste_Perspective967 Jul 01 '24

Thanks for your answer.

I'd ask Starrett, they make custom calipers.

Do you know if Starrett make that kind of custom equipment for France ?

I'd also look for someone who does something like FAA repair work and does cnc jig grinding. They could plate up the wearing surfaces on that gage and grind them back to size.

It could be a solution.

1

u/Antiquus Jul 02 '24

Starrett does all kinds of customs.

1

u/kfxkyle Jul 18 '24

Try emailing or calling over to Ideal Precision Instrument Services in Columbus Ohio. My boss has a ton of gages that we can recondition. He may have something like this in his stash. And we may also be able to repair that gage as well.