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Getting a Star probe square to your machine

John Kingston
First, you need to have your star square to the machine.
What I do is place a 123 block on my plate.
I have a Rayco plate so it is easy to get that square.
When I put the star in I eyeball it square to the block.
Your dual calsphere needs to be pretty square to the machine also.
Next, I calibrate each tip individually, starting with #1.
It might take a few tries, but it'll work.
Here are a couple of pics of how I do it.


  • You should have a set of these somewhere in your shop. HTH

    Nope, ain't seen any. Might be the Metrologoy lab has some, but I wouldn't bank on it. Think OLD....we have equipment in this place that dates as far back as 1927... The CMM I run is probably 15-20 years old. When I started this job, I had exactly three pieces of fixturing, a large cast iron machining vise (apparently made by some company no longer in business), a 4 x 10 Mitutoyo magnetic chuck with an amazingly gutless magnet, four parallel bars, and three pointy tipped screw-jack "feet" thingys (which I probably use more than anything else). A few months back, I added a V-Block. The other CMM is even more fixture-challenged, and was purchased in late 1980.

    Besides, those 123 things would be awful small for a lot of the stuff I measure.
  • Still have problem

    John I can do the same but my problem is when i go to tighten ithe star down it always ends up in the same place. Is there a way of adjusting it that I don't know of? I am a newbie at this
  • John I can do the same but my problem is when i go to tighten ithe star down it always ends up in the same place. Is there a way of adjusting it that I don't know of? I am a newbie at this

    I sent you a PM. Check it and reply .
    The star should rotate around the #1 tip when it isn't tightened. Maybe this is different than mine.
  • I agree with John "Cover sheets....We don't need no stinkin Cover Sheets"
  • Ken Amason is my predecessor. Even with his and John Kingston's help I was not able to get my star probe to calibrate all on one sphere. But with the help of James Mannes and the wonderful attached document I was able to get all tips to calibrate using both spheres. HTH


    That is one nice write up! Sure does explain a lot and just got me through what I needed Slight smile
  • New question about calibration of a star probe: I have a 3 tip "star probe" I have been using routinely for years. All of a sudden one of the tips (tip 3) won't calibrate because the magnetic coupling of our tp200 crashes into the sphere after the 4th of 9 hits. I have used this probe many many times and I basically don't know what changed to cause this issue. Watching the machine in action, it does appear the tip is going just a bit too deep into the sphere. What parameter can you just to keep the ball from going too deep?

    Thanks

    Don LaDue
  • New question about calibration of a star probe: I have a 3 tip "star probe" I have been using routinely for years. All of a sudden one of the tips (tip 3) won't calibrate because the magnetic coupling of our tp200 crashes into the sphere after the 4th of 9 hits. I have used this probe many many times and I basically don't know what changed to cause this issue. Watching the machine in action, it does appear the tip is going just a bit too deep into the sphere. What parameter can you just to keep the ball from going too deep?

    Thanks

    Don LaDue

    Have you tried qualifying the tip(s) manually? Sometimes if you do that, then the routine will run ok DCC.

    You could have a corrupt probe file. Deleting it and building a new one will fix it if that is the issue.
  • Have you tried qualifying the tip(s) manually? Sometimes if you do that, then the routine will run ok DCC.

    You could have a corrupt probe file. Deleting it and building a new one will fix it if that is the issue.


    +1
  • Isn't the "depth" of the touches adjustable?
  • Isn't the "depth" of the touches adjustable?

    Kinda Sorta Maybe . . . but. . . You stated the tip has been in use for years. Now all of a sudden something has gone wonky. Before you change the qual routine you should try to fix the wonky. Sometimes pc-dmis just "forgets" how long your tip is or where the sphere is or what it's name is or something. Occasionally when this happens, just manually calibrating the tip will solve the amnesia, (which I suspect but can't prove is due to being overdazeled by the stunning Alex & Buck).

    Pc-Dmis has also become a chronic corrupter of it's own files. You can spend a lot of time and money chasing in circles, (as I recently did), or you can just call up your star tip, open the probe utility window, make whatever notes you need to be able to rebuild the tip, then close out of pc-dmis entirely. Delete the file. Relaunch pc-dmis. Rebuild the tip. Calibrate. Carry On.

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