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2718Re: [mill_drill] Tramming Spec?

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  • Paul R. Hvidston
    Jun 4 1:44 PM
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      The old-timers would just use a cat-whisker (bent piece of heavy wire)
      chucked up and a set of feeler gauges. Set the cat-whisker to the highest
      point in the circle and measure the gap with the gauges. Now that really
      avoids the T-slot problem!

      Paul R. Hvidston, N6MGN
      ACKSYS Engineering
      Upland, CA

      ----- Original Message -----
      From: "Stan Stocker" <skstocker@...>
      To: <mill_drill@yahoogroups.com>
      Sent: Tuesday, June 04, 2002 1:31 PM
      Subject: Re: [mill_drill] Tramming Spec?

      > Hi Duncan;
      > Glad to be of some help.
      > A DTI is fine, in fact, as you can drag the indicator and it's contact
      > point behind the swinging arm and avoid the whole T slot grabbing the
      > indicator rod hassle, while avoiding a lot of neck twisting to read a
      > dial. The fact that a DTI doesn't indicate true when the arm position
      > is changed doesn't matter in this case, you're just characterizing the
      > range of difference rather than an absolute from a reference point.
      > You've noticed by now that the shim thickness doesn't seem to map
      > cleanly as some percentage of the indicated reading, so it all comes
      > down to a seat of the pants creep up on the target sort of affair
      > anyhow.
      > Most folks who are just tramming a mill the first time haven't got a
      > DTI, I usually try not to imply the need for yet another tool when I
      > post, it seems everytime you turn around someone is telling you to go
      > buy another tool when you are getting started with a new machine. You
      > can start thinking that boats or private aircraft might have been a
      > better choice, at least you know your wallet will get emptied by those
      > hobbies!
      > Cheers,
      > Stan
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