Rick,
the drill press type tool was seven years ago..
after that I went to a CNC drilling machine based on a micro mill
the latest is the proxxon hanging from the pulley, the last two pictures in the album.. 'proxxon1' and 'proxxon2'
This setup gives the fastest and most accurate holes of the three by far..
There are a whole lot of reasons it works better..
the CNC machine could not compensate for size variations in the boards due to temperature variations in the toner transfer process.
the drill press arrangement was very solid.. if the positioning was half a hole out, it would drill a hole half a hole out..
the hand held suspended arrangement solves both of these problems.. the drill wanders into the centre of the hole all by itself..
by the way, the pulley is the same as in the 'drill1' and 'drill2' pictures
Chris
--- In Homebrew_PCBs@yahoogroups.com, "Rick Sparber" wrote:
>
> Chris,
>
> I was a bit confused about which pictures you were talking about. The first
> few showed an arrangement to hold the proxxon that involved some boards and
> a spring. I thought that was very good. But your text didn't match those
> pictures so I next looked at the last pictures in your file and see an
> upgrade to the system you talked about last.
>
> Is the key difference here that you can swing the proxxon around without
> moving the board given how it hangs. I can see how the first pictures show a
> machine similar to a drill press.
>
> Rick
>
> -----Original Message-----
> From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
> On Behalf Of chris
> Sent: Saturday, January 26, 2013 5:31 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: [Homebrew_PCBs] Re: What size drill bits?
>
>
>
>
> Just a footnote ...
>
> Having posted some pics of my hand drilling jig/aid thingy I decided to
> update it a bit with some improvements I've been meaning to make for the
> last several years ! (my normal motto is, "if its not broke, don't fix
> it"!.. but the proxxon drill finally died, so I took that as an excuse)
>
> a) changed the counterweight to a solid steel weight instead of a plastic
> pot of old nuts and bolts..
>
> b) fitted a new proxxon IBS/E drill as the old IB/E had given up the ghost
>
> c) lengthened the support rod to (successfully) reduce the small
> oscillations at the drill tip
>
> d) added an LED light to the side of the drill (6 x 0.5Watt White LEDs.. a
> bit heath robinson but I had the parts to hand)
>
> e) instead of drilling and tapping a hole in the proxxon casting to fix,
> since the new one is under warranty, used a cable tie to mount it
>
> The result is that it is now faster, easier to hit the precise centre of the
> etched hole.. and I can drill more holes before my 57 year old eyes get
> tired ..
>
> I managed about 1500 holes in one half hour sitting this afternoon before my
> eyes got tired..
>
> a couple of pics in the photos spiyda folder
>
> Chris
>
> --- In Homebrew_PCBs@yahoogroups.com, "Rick Sparber" wrote:
> >
> > Chris,
> >
> > Yes, the second picture really helps.
> >
> > Thanks,
> >
> > Rick
> >
> > -----Original Message-----
> > From: Homebrew_PCBs@yahoogroups.com
> > [mailto:Homebrew_PCBs@yahoogroups.com]
> > On Behalf Of chris
> > Sent: Sunday, January 13, 2013 7:02 PM
> > To: Homebrew_PCBs@yahoogroups.com
> > Subject: [Homebrew_PCBs] Re: What size drill bits?
> >
> > Sorry second pic added..
> >
> > in photos ... spiyda drill2
> >
> > it just hangs like a plumb bob
> >
> > Chris
> >
> > --- In Homebrew_PCBs@yahoogroups.com, "Jeff Heiss" wrote:
> > >
> > > 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.com
> > > Subject: [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 , "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@yahoogroups.com
> > > ]
> > > > On Behalf Of chris
> > > > Sent: Sunday, January 13, 2013 7:00 AM
> > > > To: Homebrew_PCBs@yahoogroups.com
> > >
> > > > Subject: [Homebrew_PCBs] Re: What size drill bits?
> > > >
> > > >
> > > >
> > > > --- In Homebrew_PCBs@yahoogroups.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
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > ------------------------------------
> > > >
> > > > Be sure to visit the group home and check for new Links, Files,
> > > > and
> > > Photos:
> > > > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> > > >
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
> >
> >
> > ------------------------------------
> >
> > Be sure to visit the group home and check for new Links, Files, and
> Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
>
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>