Ideal Grade for Surface Plate used for Scraping - Page 2
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  1. #21
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    I prefer a scraped surface for blueing Never saw scraped granite plate so I use CI
    Peter

  2. #22
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    The two technicians from Standridge Granite stopped by this morning to calibrate and lap the plate. First off, I just want to state that the technicians were very courteous and professional, and followed all safety practices.

    They started by checking the plate with the Repeat-o-matic, then shooting it in with the auto collimator. The plate was flat, but had a wear spot at about .0007", I opted to have it lapped to AA as the price from B to AA was only about $80.

    You can see the low spots on the granite, as they are darker. The whole process took about 1.5 hours. The plate is sitting at .00025" overall flatness, with a repeatability of .000060".

    The surface feels much smoother and actually changed color from a dark smoky color to a greyish where the actual granite surface could be seen.

    img-8802.jpg
    img-8805.jpg
    img-8806.jpg

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  4. #23
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    How much did they ding you? I have a few plates and need to get mine done before long.

    And wow, talk about all the wear being in one spot! You can definitely see where that plate was used the most.

  5. #24
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    Total was $355, $40 for visit, and $315 for lapping, the calibration is free when you purchase the lapping.

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  7. #25
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    Did they measure the temperature or do anything to thermally stabilize the stone before calibrating and lapping?

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  9. #26
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    Yes, they allow the lap to equalize with the stone as well. My shop/stone was right at room temp.


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