[Boatanchors] Probably OT: Drill press runout question

[hwhall at compuserve.com]

I'd used the tape trick for some diamond tools whose shanks didn't fit my Dremel well and like you said the same taped tools still work fine years later. The #64 was so tiny, though, that I doubted I could get tape to roll onto it in an orderly fashion. But now you've got me thinking that some adhesive added to the drill bit before shrinking the tubing onto it might just fix it right up. Thanks!
 

 Wayne
WB4OGM

 

-----Original Message-----
From: manualman <manualman at juno.com>
To: hwhall <hwhall at compuserve.com>
Cc: boatanchors <boatanchors at mailman.qth.net>
Sent: Tue, Apr 29, 2014 12:41 am
Subject: Re: [Boatanchors] Probably OT: Drill press runout question


I've used the masking tape "trick" on several "60's" size bits over the
years. I still use several of them that I did back in the 70's. The tape
doesn't slip. Can't take credit though for the idea; I learned the trick
while working at Bell Laboratories.

Pete, wa2cwa

On Tue, 29 Apr 2014 00:12:11 -0400 (EDT) hwhall at compuserve.com writes:
> Yes, that works. I used my smallest heat shrink tubing to "fatten up" 
> the bit and it works for a while but the bit gradually slips inside 
> the tubing. That gives me an excuse to take a break, though, while I 
> readjust the bit and let my back straighten out some. I really ought 
> to have an adjustable height stool while doing this. 
> 
> I think that the next step will be getting some of the little PC 
> board drill bits with larger shanks off Ebay. I don't think I'll 
> find any around town.
> 
>  
> 
>  Wayne
> WB4OGM
> 
>  
> 
> -----Original Message-----
> From: manualman <manualman at juno.com>
> To: hwhall <hwhall at compuserve.com>
> Cc: boatanchors <boatanchors at mailman.qth.net>
> Sent: Mon, Apr 28, 2014 9:01 pm
> Subject: Re: [Boatanchors] Probably OT: Drill press runout question
> 
> 
> For the very small drill bits where the chuck won't quite grab it, 
> I've
> wrapped several layers of masking tape around the chuck end of the 
> drill
> bit. Also, one or two pieces of tubing (the stuff you slip over the 
> bare
> wires of components to keep them from shorting other things) would 
> also
> work. This way you don't have to diddle mini chucks or chuck 
> reducers.
> 
> Pete, wa2cwa
> 
> On Mon, 28 Apr 2014 22:46:49 -0400 (EDT) hwhall at compuserve.com 
> writes:
> > 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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