Remove ratchet on Hejnar rail with Mitutoyo micrometer?

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dlg
Posts: 26
Joined: Wed Nov 04, 2015 11:47 pm

Remove ratchet on Hejnar rail with Mitutoyo micrometer?

Post by dlg »

Just got a Hejnar 25 mm micrometer rail with the 20% off Memorial Day sale. :D The Mitutoyo micrometer screw has a ratchet at the end, but as the torque forces to move the stage are much higher than for micrometer measurement applications, it is useless. I can unscrew it to make the whole device a bit more compact, but then there is a hole at the of the micrometer device. Is that an issue with dirt? Should I find a blank screw to plug the hole? Anything to else to consider?

Thanks!

lothman
Posts: 455
Joined: Sat Feb 14, 2009 7:00 am
Location: Stuttgart/Germany

Re: Remove ratchet on Hejnar rail with Mitutoyo micrometer?

Post by lothman »

dlg wrote:...I can unscrew it to make the whole device a bit more compact, but then there is a hole at the of the micrometer device. Is that an issue with dirt? Should I find a blank screw to plug the hole? Anything to else to consider?

Thanks!
If this Link shows your micrometer screw, then there is no "open" hole for the ingress of dirt. But due to optics I would close the ratchet hole by an appropriate screw or a small plug.

goto10
Posts: 3
Joined: Sun Jan 26, 2014 7:17 pm

Post by goto10 »

I too have the Hejnar 25mm rail (one sexy hunk of metal) and removed the ratchet for the same reasons mentioned by OP. I did some research and concluded that the thread size of the screw is not something standard, though I could be wrong. Ended up using a little bit of gaffer tape to seal the hole.

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