Granite Surface Plate - $140 (Fresno, CA)

I have a similar Collins Surface plate, though it has 2 ledges. I paid $60 for mine, laying on a rack of metal stock in the back of a machinist's shop. I then cleaned it up and put together a "plate fest" at my shop. 3 other local machinists also brought their plates, 5 total, and Standridge Granite came to my shop on one of their road trips out of southern California and calibrated them. My portion of the calibration cost ended up to be slightly over $100, I think it was $103 and some coins. Great guys who did efficient and good work. It was calibrated to .000030" overall (Class A) from the .003+" dish in the center they found before getting to work on it. Any surface plate is only a tombstone unless it has been calibrated while in your possession.

Here is a post I did at the time: https://www.hobby-machinist.com/threads/surface-plate-calibration-collaboration-or-plate-fest.45514/

That is a good size plate for a typical hobby shop. Buy it , get it calibrated, and get to work...
 
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