Replies

1. 
   BruceS | Apr 25, 2011 05:58pm | #1

   The Chuck
   Get a good piece of drill rod and a dial indicator. Chuck up the rod and check, remove and rechuck and check a few more times. I'll bet the chuck isn't scrolling the same every time.

1. 
   HowardPeson | Apr 26, 2011 11:49am | #2

   Drill Press run out looked again

   Thanks for your response.  I did what you suggested.  I found out that the chuck itself does not run true.  It is exagerated in the bit end.  For a 5 inch drill bit the run out is about 1/16 inch.  Is there something to do to fix this?

2. 
   oldwindowguy | Apr 26, 2011 04:38pm | #3

   Very good advice to do the runout check several times.  If the runout is different each time, the problem is in the chuck.  If the runout is the same each time, the problem is most likely above the chuck.

   If the problem is in the chuck, you might spray a little thin oil up into it in the hope it will carry out any contamination with it when it drips down--most drill presses I've worked on are too big to stand on their heads.  You can replace the chuck or take it apart and clean it if you have an inclination towards watchmaking.  There are good instructions on Jacobs chucks on the web.

   If the problem is above the chuck it may be that the chuck is not mounted straight.  This is a Jacobs taper mount on my (older) Delta drill press.  Pull the chuck (again, good instructions on the web), clean the taper and remount it.  Above that, ANY burr or contamination on the shoulder of the quill against the bearing will cause the quill to precess as it turns.

1. 
   HowardPeson | Apr 27, 2011 11:21am | #4

   Drill Press run out thanks

   I did what you suggested and went on the web and cleaned the taper inside and out.  I have also noticed others tightening the chuck by applying a little on each hole.  I did that.  What ever helped did the job.  Now it is running true and it is fun to use the drill press again.  Thanks very much for your help.