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2722Re: [mill_drill] Tramming Spec?

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  • Mario L Vitale
    Jun 4, 2002
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      Duncan,
         Boy, time flies when you're having fun! Did I say a recent article? ....It's Projects in Metal magazine, August 1993  Vol. 6, No.4 pages 26, 27, and 28 !!!!
         Well at least my memeory isn't gone!?!?
                                                                      Mario
      ----- Original Message -----
      Sent: Tuesday, June 04, 2002 11:10 AM
      Subject: RE: [mill_drill] Tramming Spec?

      Thanks Mario, if you could dig up the magazine/issue number I'd appreciate it.
       
      Duncan
      -----Original Message-----
      From: Mario L Vitale [mailto:mariol.vitale@...]
      Sent: Monday, June 03, 2002 7:25 PM
      To: mill_drill@yahoogroups.com
      Subject: Re: [mill_drill] Tramming Spec?

      Duncan,
         It sounds like you used the correct proceedure and it is not too unusual to find that kind of error. If I understood you correctly you only took readings 6" to the left and right of the spindle. You should also check front to back error as well.
         With a little bit of  patience you should be able to get it within a few thou., certainly under .005"
         There was a very good article outlining the process in a recent Home Shop Machinist or Projects in Metal magazine. If you'd like, I'll try to find which issue it is in.
                                                                          Mario 
      ----- Original Message -----
      Sent: Monday, June 03, 2002 7:32 PM
      Subject: [mill_drill] Tramming Spec?

      After reading here about tramming the head I decided to check my RF20. I used an Indicol with a DTI. I positioned the DTI at about 6" to one side of the head and set it to zero. I then rotated the head 180 degrees and took a reading. I got a 10 mil difference over 12". This is a lot higher than I would have thought. Did I use the right measurement technique? Is this kind of measurement typical? If I shim the column what should I be able to get the flatness/runout down to?
       
      Duncan
      -----Original Message-----
      From: philteague [mailto:philteague@...]
      Sent: Monday, June 03, 2002 1:56 PM
      To: mill_drill@yahoogroups.com
      Subject: [mill_drill] Running out of things to post

      Group members:

      Well, I guess everyone has just run out of things to say to the
      newsgroup. Not that I have anything particularly important to share.

      Over the weekend I spent more time than I should have on trying to
      made an indexable boring bar. This involves machining a V slot in the
      end of a 1/2" piece of drill rod so I could mount a TCMT32 carbide
      insert. I had thought that this would be something I could do and
      save myself anywhere from $20-50 over the price of a commercial
      boring bar. Well, it isn't quite as easy as I thought. I did manage
      to make a boring bar, but, it was not anything that I was sure would
      work very well. I tried again and the results were even less
      successful. I may just stick to the HSS insert boring bars (using my
      lathe) or the the boring head and carbide type boring bars using my
      mill/drill. If anyone has had any luck with making such a tool I
      would like to hear about it.

      Phil Teague


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