Getting a Star probe square to your machine

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.

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ClayOgre over 16 years ago

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.
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ClayOgre over 16 years ago

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.
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