I would like to understand your setup but I am confused too. I viewed the
picture. Is the drill/pole on a slide? Or is it just hanging from the
pulley like a plumb bob?
Jeff
_____
From:
Homebrew_PCBs@yahoogroups.com [mailto:
Homebrew_PCBs@yahoogroups.com]
On Behalf Of chris
Sent: Sunday, January 13, 2013 9:32 AM
To:
Homebrew_PCBs@yahoogroups.comSubject: [Homebrew_PCBs] Re: What size drill bits?
Rick,
there is a rope (or string really.. I use light switch pull cord)
the string goes from the counterweight (which is an old pill container with
nuts and bolts in it), over the pulley and down to the aluminium pole..
the pole is about 3 feet long with the proxxon frmly fixed to the end.. The
way I have it rigged, there is 2 foot clear of string between the pulley and
the top of the pole
the role of the pole (rhyme :-) ) is partly to damp oscillation..
I started with about a foot long and quickly realised in needed to be
longer, the aluminium pole was just a bit of scrap from under the bench
In retrospect, the pole needs to be as long as possible without fouling on
the pulley.. but what I put together works so I'm loath to fiddle with it..
An old fishing pole would probably be ideal..
I've put a picture in the photos spiyda drill
Chris
--- In
Homebrew_PCBs@yahoogroups.com<mailto:Homebrew_PCBs%40yahoogroups.com> , "Rick Sparber" wrote:
>
> Chris,
>
> Elegantly simple! You get a very clear view of the place to be drilled and
> quick action.
>
> I sounds like it doesn't take long to develop the skill to make this work.
I
> have plenty of 0.75 mm drills to learn on ;-)
>
> I'm confused about the pulley's role. Is the 3' rod resting on the pulley
or
> is there a rope attached to the pulley that supports the rod?
>
> Rick
>
> -----Original Message-----
> From: Homebrew_PCBs@yahoogroups.com
<mailto:Homebrew_PCBs%40yahoogroups.com>
[mailto:
Homebrew_PCBs@yahoogroups.com<mailto:Homebrew_PCBs%40yahoogroups.com> ]
> On Behalf Of chris
> Sent: Sunday, January 13, 2013 7:00 AM
> To: Homebrew_PCBs@yahoogroups.com <mailto:Homebrew_PCBs%40yahoogroups.com>
> Subject: [Homebrew_PCBs] Re: What size drill bits?
>
>
>
> --- In Homebrew_PCBs@yahoogroups.com
<mailto:Homebrew_PCBs%40yahoogroups.com> , Mitch Davis wrote:
> >
> > On Sun, Jan 13, 2013 at 10:59 AM, thb201 wrote:
> > > I was looking to get some drill bits but I only want to get just a
> > >few sizes, especially if I spring for the more expensive carbide types.
> >
> > Carbide bits stay sharp for a long time, but they are amazingly
> > brittle. The slightest sideways movement and ∗ping∗, they're gone.
> > It's not realistic to use them with something you hold in your hand.
> > I have used a normal drill press with good results.
> >
> > Mitch.
> >
>
> I use 0.8mm carbide bits in a hand held proxxon
>
> I can usually manage a few thousand holes before the drill breaks..
>
> My wife usually breaks the drill withing the first dozen holes or so..
>
> I have been through several methods of drilling, including a commercial
> drill press, a home made foot operated drill press, a CNC drilling machine
> and ended up with the following
>
> a pulley at ceiling height
>
> a proxxon hand held drill fittted to about a 3 foot aluminium pole
>
> the pole is suspended from the pulley with a counterweight giving it
> slightly negative weight so that when you let go it goes upward, away from
> the board
>
> the very end part of the proxxon has a rubber grommet fitted.. and it it
> this that is held lightly between finger and thumb..
>
> this setup keeps the holes vertical and reduces hand and arm strain..
>
> using this, my wife can drill almost as many holes as I can before
breaking
> the bit..
>
> I manage about 2 holes a second when they are close together..
> with an average of about 1 per second over a longer period
>
> thats a fair bit faster than my CNC machine can do.. when things like
> clamping and regictration are included.
>
> Chris
>
>
>
>
>
> ------------------------------------
>
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Photos:
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>
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