[ATM] drilling calipers

[Berthold Hamburger]

Sure enough, the gorilla glue came off... However, the masonry 4mm bit did
the job quite nicely and also concluded its useful life with that duty. Just
in case you want to know, it is for the sliding focuser of my almost
finished startesting scope and is meant to measure the exact defocusing
distance.
I hope to finish the whole thing tomorrow and will post some pictures then.

Thanks to all for the good comments!

Berthold

-- 
Berthold Hamburger - Cellist/Spain
Email: behambu at artinso.com
http://www.artinso.com
http://www.astro.artinso.com


>>-----Original Message-----
>>From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf
>>Of Bob May
>>Sent: sábado, 04 de septiembre de 2010 9:53
>>To: atm at atmlist.net
>>Subject: Re: [ATM] drilling calipers
>>
>>Drilli ng hardened steel is always a bit of fun.  It can be done
>>with a drill but is much easier done with EDM work.    For
>>drilling with a bit, try a diamond bit as the best choice.
>>Carbide tooling will sometimes do a fair job but you have to run that
stuff at a
>>very paricular speed (no hand drill motor stuff
>>hgere!)  with great pressure.  Not an easyt job to do so do you really
need to
>>have the hole?
>>Bob May
>>
>>rmay at nethere.com
>>http: slash /nav.to slash bobmay
>>http: slash /bobmay dot astronomy.net
>>
>>
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