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Dails Caliper has a mystery component in box?

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Chris TickTock19/08/2019 13:45:13
163 forum posts
1 photos

Hi, i have bought a used dial caliper but it has a copper looking thing about 2b inches long thin at one end with a sphere to hold it at the other, i would guess its for calibration but does anyone know for sure what it is for and how it is used.

regards

Chris

Can anyone help guide me how to upload a picture with a post/

Brian G19/08/2019 13:51:13
548 forum posts
17 photos

Hi Chris

If you click on the "Albums" link at the top you can create a new album and upload your image. Then to put it in a post you click on the camera icon (top row of the box you type your message in) and select the image from your album.

Neil put full instructions here **LINK**

Brian

Edit:  Is the box fitted to take the additional item?  If not, could it be part of a wiggler like this?

Edited By Brian G on 19/08/2019 13:54:23

old mart19/08/2019 13:55:15
442 forum posts
42 photos

Dial calipers have a rack which meshes with a gear that drives the pointer. Sometimes the gears jump a tooth or more, resulting in the pointer not reading zero when the jaws are shut. I am guessing, here, but the tool may be for tipping the spring loaded gear out of mesh with the rack, to get the pointer reset. I had a Tesa dial caliper, but that was 40 years ago, and my memory is not great.

Somebody will be able to post some photos showing exactly how its done.

Chris TickTock19/08/2019 15:03:39
163 forum posts
1 photos
Posted by Brian G on 19/08/2019 13:51:13:

Hi Chris

If you click on the "Albums" link at the top you can create a new album and upload your image. Then to put it in a post you click on the camera icon (top row of the box you type your message in) and select the image from your album.

Neil put full instructions here **LINK**

Brian

Edit: Is the box fitted to take the additional item? If not, could it be part of a wiggler like this?

Edited By Brian G on 19/08/2019 13:54:23

Thanks guys appreciated.

Chris

Mick B119/08/2019 16:06:38
1151 forum posts
63 photos
Posted by old mart on 19/08/2019 13:55:15:

Dial calipers have a rack which meshes with a gear that drives the pointer. Sometimes the gears jump a tooth or more, resulting in the pointer not reading zero when the jaws are shut. I am guessing, here, but the tool may be for tipping the spring loaded gear out of mesh with the rack, to get the pointer reset. I had a Tesa dial caliper, but that was 40 years ago, and my memory is not great.

Somebody will be able to post some photos showing exactly how its done.

I thought the things must've stopped doing that since then, otherwise why are people still buying them?

surprise

old mart19/08/2019 16:32:46
442 forum posts
42 photos

If a foreign body gets trapped in the rack, the pinion would be destroyed if there was no allowance made to spring load the pinion shaft. Outside of a clean room, shit happens.

David George 120/08/2019 11:12:50
avatar
877 forum posts
292 photos

Hi I have a dial caliper and in the box is a copper coloured strip which is used to adjust the dial if it jumps a tooth. You slide it between the rack and gear and then slide the carriage along a small amount and then pull out strip it may take a few tries to get it right.

David

old mart20/08/2019 13:08:17
442 forum posts
42 photos

That's exactly what I was trying to explain, David, thanks for the endorsement.

Michael Gilligan20/08/2019 14:05:02
avatar
13801 forum posts
599 photos
Posted by old mart on 20/08/2019 13:08:17:

That's exactly what I was trying to explain, David, thanks for the endorsement.

.

Just one small caveat, if I may: The descriptions of the tool's purpose are fine, but it is always worth checking the rack and cleaning if appropriate. ... Said foreign body can sometimes be stuck in place rather tenaciously

MichaelG.

Chris TickTock20/08/2019 14:50:43
163 forum posts
1 photos

Thanks guys you have given me enough to work on.

Regards

Chris

old mart20/08/2019 15:54:13
442 forum posts
42 photos

This is the weakness of a design with exposed gears, you have to take care not to drop then in the dirt.

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