The drill is not a reliable indicator. At least put a piece of rod stock
(straight cold rolled or better) in the chuck and check it them.
Right now you have potential run-out from the:
1. drill bit
2. chuck
3. chuck taper
4. spindle taper
3. spindle
To be more exact, you will need to buy a dial indicator. If you do not think
you really need a dial indicator, then you should not be worrying about this
run-out. Seriously, you have to find the cause to fix the problem.
Mark V.S. in Austin, TX
-----Original Message-----
From: Donald H Locker [mailto:dhl@chelseamsl.com]
Sent: Thursday, October 31, 2002 1:24 PM
To: VanScoter, JMark; ryoung@navcomtech.com
Cc: rusd@velocitus.net; marka@telerama.com; shop-talk@autox.team.net
Subject: Bent spindle? (was Re: Drill Press recommendations?)
Hi, Mark and Randall.
I believe the MT socket is clean; I've always cleaned it and the arbor
before assembly, but I will check again before testing. I have the
arbour out anyway.
As for how far out the thing is, the tip of a drill bit [now]
describes a circle which is about, oh, 20 thou at a distance of eight
inches from the lowest end of the spindle socket. That decreases to
about 5 thou at a distance of two inches from the lowest end of the
spindle socket (which is the bottom of the chuck arbor.)
This is greatly reduced from it's previous error circle, which was
about 80 thou at four inches from the spindle. Looks like my previous
cleaning methods were inadequate, or I missed something.
Thank you for the questions and suggestions. I'm much happier and
more confident in my tool. And one of these days I'll get a DTI so I
can REALLY test it.
Donald.
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