[ATM] drilling calipers

[Berthold Hamburger]

Thanks for all the good suggestions! In the meantime and out of desperation
I resorted to gorilla gluing some aluminum pieces to the caliper in order to
get some fixing points. However that does not inflict too much confidence
and I will probably end up getting some carbide tipped bits. I was not aware
that masonry bits are carbide tipped, so I might try that first. However,
since I need a 3mm bit and my masonry bits start at 4mm, that may not be an
option.

Thanks again

Berthold

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


>>-----Original Message-----
>>From: o1bigtenor [mailto:o1bigtenor at gmail.com]
>>Sent: sábado, 04 de septiembre de 2010 7:18
>>To: Berthold Hamburger
>>Subject: Re: [ATM] drilling calipers
>>
>>On Sat, Sep 4, 2010 at 11:10 AM, Berthold Hamburger <b-
>>hamburger at artinso.com> wrote:
>>> Hi,
>>>
>>>
>>>
>>> Has anybody successfully drilled through the hardened shaft of a
>>> Chinese digital caliper? I have tried the better part of this
>>> afternoon to do it using cobalt drill bits and have not gotten anywhere.
>>>
>>Use a carbide drill bit. If you want to do it on the cheap go find
yourself a
>>concrete drilling bit. Same idea except the concrete drilling bit only has
a carbide
>>tip where the other one is all carbide.
>>
>>There are lots of grade available with quality reflected in the price.
>>You want to turn things not too quickly. If you can´t keep things flooded
with
>>coolant (pressurized spray more like it) drill it dry.
>>Carbide doesn´t like thermal shocks or vibration either make things
crumble!!
>>
>>Let me know how things go.
>>
>>Darald