Subject: H.S. Drillpress/ drilling thin stock

From: [email-masked]
Date: Thu, 05 Dec 1996 07:32:02

Interesting puzzle:

We drill thin (.016") curved, work-hardened yellow brass. Need a .219" 
hole. These are furniture backplates, so the hole needs to be bur free 
and the drill can't catch when it goes through, ripping the metal.

Currently we use bits specially sharpened so they cut out the edge 
cleanly. But the solution would seem to be a very high speed drill.

However, HS drillpresses all seem to have a chuck that only goes up to 
.16"

So. . . Is there a more robust HS drillpress available that we haven't 
been able to find? Special bits for thin (curved) stock?

Cannot use a punch, it's been tried, but the nature of the curves 
makes it nearly impossible not to crush or change the complex curves.

Thanks for any input,
T. Rockwell

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From: [email-masked]
Date: Thu, 05 Dec 1996 18:40:33 -0800

[email-masked] wrote:
> T. RockwellTurn the .219 shank down to .16 on a lathe.
I have done this many times to make drills fit my R8 collets
on my mills.
                                         Jim

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From: [email-masked]
Date: 7 Dec 1996 03:19:43 GMT

>makes it nearly impossible not to crush or change the complex curves.

Sounds like a job for CNC-EDM

Peter

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From: ANDY POPKY <[email-masked]>
Date: Sat, 07 Dec 1996 15:05:06 -0500

> Sounds like a job for CNC-EDM

peter

you need to get with the times<w>
this is a job Laser CNC

maybe if you watched the Discovery channel
you would learn about these things<w>

edm would be to slow

regards,
andy popky

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From: [email-masked]
Date: 8 Dec 1996 17:10:42 GMT

>you would learn about these things<w>

Perhaps you are right Andy.   But, Laser and I speak from practical
experience that has cost a bunch of money to learn, leaves a bad burr and
you have to hand deburr. The Laser melts the stuff away whereas EDM eats
it.

Horses for courses, mate. I use Laser cutting for some stuff but EDM for
others. The EDM stuff goes straight to the anodizers. Sure it is slow but
my EDM'er sets it up and lets it run over the weekend. Comes in Monday
morning and I have 300 parts.

You seem to spend too much time watching TV. You need to get out into the
real world and see how things are done, not just the theory. <g>

Peter
Still with no time to watch TV, thereby making his own discoveries.

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From: David Fogg <"[email-masked]"@worldnet.att.net>
Date: Sun, 08 Dec 1996 01:25:20 -0500

ANDY POPKY wrote:
> andy popkyabrasive water jet could also be used

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From: David Fogg <"[email-masked]"@worldnet.att.net>
Date: Sun, 08 Dec 1996 02:08:33 -0500

> you would learn about these things<w>

Abrasive water jet could also be a solution