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Thread: Checking your PRS for square

  1. #1
    Join Date
    May 2014
    Location
    MA
    Posts
    462

    Default Checking your PRS for square

    Hey all here's a method I use to check my PRS for square.

    https://youtu.be/s2z9tTbTdcY

    It's a quick check I do with some scraps. I so this every time I surface my table to make sure my machine is nice and square.

  2. #2
    Join Date
    Jan 2015
    Location
    Palm Coast, FL
    Posts
    193

    Default

    I wanted to thank you for your video, Eric. I did not use your exact method but a variation of it. I nailed a couple of scrap pieces of MDF in each corner with plastic nails and then cut out a large rectangle, approx 94" x 46". Working by myself, it was then pretty simple to hook my tape on the corners and check the diagonals.
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  3. #3
    Join Date
    May 2014
    Location
    MA
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    462

    Default

    I dug this old thread up looking for it so I could share it to someone else and I realized I never posted my updated way that I keep my ShopBot in square:

    https://youtu.be/LrSLWpKjLU8

    This is a method that I use that uses a prox switch on both of my X motors. With a script, I stop one of the X motors, and use the other one to gently (and accurately) bring my gantry into square each time I power up.

    When I first started using my ShopBot, I didn't realize they could get out of square, which is why (after getting burned on running a bunch of MFT tables) I started using my modified squaring method. Now I have it run automatically with this method at powerup. It's very accurate and repeatable. Best of all, if you're into doing a bit of wiring, it can be setup with a relay and some scripts.

  4. #4
    Join Date
    May 2014
    Location
    MA
    Posts
    462

    Default

    Once again digging up this old thread... I recently moved my machine across the shop, and naturally I checked everything after the move to make sure it was in spec. Unsurprisingly it got a bit out of square. I used the same method as I did with the dowel pins, but I changed it a bit. I got some flat tape measures and taped them to the table:

    IMG_20191008_101026.jpg

    I used a V Bit to set the the tape measures' origin exactly at X0 Y0 and X0 Y48. Then taped them down and ran them diagonally across the table. From there I used the routine I did in these videos to get my machine perfectly back to square.

    https://www.amazon.com/FastCap-PMS-F...6&sr=8-1-fkmr2

    That's the tape measure I used. Hope this helps someone!

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