On Wednesday 17 March 2010, Slavko Kocjancic wrote:
>Gene Heskett pravi:
>> On Wednesday 17 March 2010, Ian W. Wright wrote:
>>>>>>>>>>>> If you use 0.4mm drill and have little "to high"
>>>
>>> feedrate then this is
>>> recipy to broke that drill.>>>>>>>>>
>>>
>>> I regularly use 0.2mm drills and sometimes even down to 0.1
>>> - and that's carbide drills drilling tool steel usually...
>>> Have you looked at the price of 0.2mm carbide drills
>>> recently?? Fortunately, I can often get hold of a few 0.3mm
>>> and above drills ex. the printed circuit industry but they
>>> are getting harder to find recently and anything smaller
>>> than that is usually special order...
>>>
>>> Ian
>>> _____________________
>>> Ian W. Wright
>>> Sheffield UK
>>
>> And what sort of a microscope do they use to sharpen such a tiny beastie?
>>
>> Or do they just cnc the sharpening process and assume its good?
>
>Just special jig and cnc sharpening. No microscope. ... And sharpening
>is little rought word for that. It's best described with word polishing
>as operation is done with cooper disc and diamond polish. (at least 5
>year's ago when I was do that few times.
I figured as much, having seen that used to sharpen lathe tools back in '60
when we were carving out the cases and such for the tv cameras that went down
into the mohole on the Trieste in Feb '61. The machinist had a jig with
several holes bored in it, and the tool was mounted, and dropped over about a
5/16" diameter vertical rod thru each of those holes, and the tool tip then
panned back and forth across the disk which had a drop of diamond oil added.
I think that disk, about 2.5" in diameter, was brass, but after 50 years, the
memory is hazy so it could have been copper. Those cases, like the Trieste's
gondola, were designed to withstand about 25k psi. Bored them out of solid
bronze rod a couple of feet long and 8" in diameter. The camera was 2.5" in
diameter, and we gave it about 1/4" of wiggle room with rubber grippers. The
Navy supplied the quartz windows for the front, and we designed and made the
rear packing gland that passed a piece of small video cable that also carried
the power. It all worked and owners of old encyclopedias can see some of the
pix shot off the mono monitors of the life that lives 37k feet deep in the
Marianas Trench. No digital cameras in those days, 2 old range finder
Leica's and a minox & the only thing that had a lot of film was the Minox.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
After all, it is only the mediocre who are always at their best.
-- Jean Giraudoux
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