[Boatanchors] Probably OT: Drill press runout question

manualman at juno.com manualman at juno.com
Tue Apr 29 02:39:54 EDT 2014


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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