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Thread: Former Colex user trying to learn my ShopBot. RPM Speed Question

  1. #1

    Default Former Colex user trying to learn my ShopBot. RPM Speed Question

    What is the max RPM I can run my table at, I have a PRSalpha 4 x 9 Gantry, I believe.

    I am trying to get the glassy edges on acrylic, that I was able to get on the Colex table. I am pretty sure, I was cutting at 25-30000 rpm.

    But, I am not sure I can run this spindle that fast. Seems the previous user has his RPMs all set at 18000

    Thanks!
    Dave

  2. #2
    Join Date
    Mar 2013
    Location
    Memphis TN
    Posts
    921

    Default

    If you have the standard spindle, the top is 18k. You should be able to get the same effect by slowing down the feeds.
    ShopBot Details:
    2013 PRS Alpha 96x60x12
    4hp Spindle
    12" indexer
    Aspire
    Rhino
    Fusion 360
    Ferrari 360
    Prusa MK3S+

  3. #3
    Join Date
    Jan 2011
    Location
    Buchanan Michigan
    Posts
    145

    Default

    A couple tricks that I learned on acrylic. I start with a wrought pass leaving around 0.05". Then finish pass to size cut as a climb cut, high RMP and fast travel. Then use a torch on the finished surface to just barely melt material (flame polish). This will give a great edge finish. You may want to experiment on some scrap material to test what works out best.
    Take a look at this link:
    https://www.youtube.com/watch?v=Mmd56UMHDK0

  4. #4
    Join Date
    May 2014
    Location
    MA
    Posts
    590

    Default

    That’s a good suggestion Rob. I do a similar approach with decent results. With a little tuning you can get pretty decent quality but at some point you run up against these being aluminum framed machines.

    Also that being a PRS alpha there’s a chance that it has a Colombo spindle capable of higher than 18k rpm.

  5. #5

    Default

    Fast Travel! I need to try that, I was thinking slower travel might be the trick, and am down to .5 in/per. Its better then what we were getting before I started, but not what I am used to.

    Back to the shop I go!

    Dave

  6. #6
    Join Date
    May 2014
    Location
    MA
    Posts
    590

    Default

    .5 IPS is waaaay to slow. Start at 3 to 4

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