Dails Caliper has a mystery component in box?

[Chris TickTockParticipant @christicktock]

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/

[Chris TickTockParticipant @christicktock]

[Brian GParticipant @briang]

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 martParticipant @oldmart]

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 TickTockParticipant @christicktock]

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 B1Participant @mickb1]

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?

[old martParticipant @oldmart]

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 1Participant @davidgeorge1]

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 martParticipant @oldmart]

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

[Michael GilliganParticipant @michaelgilligan61133]

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 TickTockParticipant @christicktock]

Thanks guys you have given me enough to work on.

Regards

Chris

[old martParticipant @oldmart]

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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