[Milsurplus] [Boatanchors] Probably OT: Drill press runout question

[J. Forster]

You may want to clean and relube the wonky chuck. There may be some grit
or something in it.

-John

=================


> Thanks to all for the info and suggestions. Looks like I need to (a)
> upgrade my chuck hardware and (b) get some of the PC board bits with the
> larger shank diameter. For now I was able to complete the  prototype board
> drilling using the excellent ideas of tape and heat shrink tubing. The bit
> was too tiny to get the tape wrapped onto it right but I had some suitable
> sized heat shrink tubing. The bit slowly slipped inside the tubing at
> first, but taking a hint from the tape idea, I remade it with some GOOP
> glue on the bit's shank under the heat shrink tubing and that seemed not
> to slip anymore.
>
> Thanks & 73 to all,
>
> Wayne
> WB4OGM
>
>
>
>
>
> -----Original Message-----
> From: David Knepper <collinsradio at comcast.net>
> To: milsurplus <milsurplus at mailman.qth.net>; boatanchors
> <boatanchors at mailman.qth.net>; hwhall <hwhall at compuserve.com>
> Sent: Tue, Apr 29, 2014 4:43 am
> Subject: Re: [Boatanchors] Probably OT: Drill press runout question
>
>
> Try shrink tubing
>
>
>
> David Knepper - W3CRA/W3ST
> Collins Radio Association
> www.collinsra.com
> Join the CRA today
> -----Original Message-----
> From: hwhall at compuserve.com
> Sent: Monday, April 28, 2014 10:46 PM
> To: milsurplus at mailman.qth.net ; boatanchors at mailman.qth.net
> Subject: [Boatanchors] Probably OT: Drill press runout question
>
> I need to drill some very small circuit board holes for a project, #64
> drill
> size (.036 inch). My drill press chuck wouldn't grab a bit that small, so
> I
> got a mini chuck to fit into the press. The mini chuck shank is 1/4 inch.
> When I installed the mini chuck, the drill bit wandered in a circle, like
> a
> case of runout. Not like a bent bit, the whole length of the bit was
> moving
> around. But when I put a 1/16 inch bit into the drill press, there isn't
> any
> runout anymore.
>
> Thinking the mini chuck to be faulty, I looked around the workbench some
> more and found a hand drill that would grab the #64, and it ran true when
> I
> turned it, so I removed it and inserted it into the drill press. It had a
> 5/16 inch shank. This combination also showed wobble. But the drill press
> still will turn a small diameter drill bit without noticeable wobble.
>
> It's as if the wobble turns up only when the drill press chuck is made to
> hold a larger diameter, and goes away with the smallest diameters. Does
> that
> make any sense or suggest something that I should inspect or adjust?
>
> Thanks!
>
> Wayne
> WB4OGM
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