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I am thinking of purchasong one of these surface plactes but wonder of the inserts will have any effect on its accuracy?

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JimDawson

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#2
The inserts shouldn't affect the overall accuracy.
 

bhigdog

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#3
Are you sure they are true surface plates made to be FLAT, or are they only granite bases who's primary purpose was providing mass and stability to whatever was bolted to them........... Just saying................Bob
 

Dabbler

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#5
these are a scream of a deal!
 

Bob Korves

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#6
Looks like a block of granite with some threaded inserts put in it. Are there surface plate certification/calibration stickers on them? If not, I am afraid you are looking at tombstones, at least from a machinist standpoint.

I bought my 18x24x4 two ledge surface plate for $50, and had it calibrated by Standridge Granite. Sometimes inserts are put into surface plates for various uses, but make sure it is really a surface plate first. It costs a lot to get a tombstone made into a surface plate, it will have to go to the plant to be ground flat enough and then calibrated.
 

newbydave

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#7
It does look like it is from a CMM will have to check with the seller.
 

Holescreek

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#8
For $50, I'd buy one. The inserts might actually come in handy.
 
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