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Bridgeport mills, VFD's and the vari-speed head...

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  • #16
    Thanks, I think I have seen the conversion - he even cut down the polished ally head to make it slimmer than standard.

    I think at the moment I have a workable solution that will get me going at least - I already have a VFD on the spindle, I tested this at 25 - 75Hz range and it seemed ok with my motor. I will keep the vari-speed setup to give me the needed torque increase etc but mark the dial in two places - 700rpm and 2200rpm

    I now have effectively two speed ranges 25Hz to 75Hz at setting one and the same at setting two. This equates to variable speed and torque over a range of 450 to 3000 rpm. Then I still have the same in back-gear so my range now extends to 40rpm in four ranges.

    I have written a macro for Mach3 that looks at the speed called for in code and tells me where to set the back-gear and speed wheel.

    Its not ideal but it means it's free and should be enough to get going with. Most of my stuff is 500 to 2000 rpm anyway.
    If it does'nt fit, hit it.
    https://ddmetalproducts.co.uk
    http://www.davekearley.co.uk

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    • #17
      Update, just ordered a larger AC motor, sensorless-vector VFD, braking resistor and encoder to replace all the junk up top, the clattering pulleys and my previous variable speed plan finally got to me

      According to the motor guy I should have decent torque and power from 5Hz to 100Hz, plus with the encoder and my spindle controller I will have closed-loop speed control so it should try to maintain the requested speed up to the limits of the VFD at least, might be a bit of a lag but it is supposed to work well.
      If it does'nt fit, hit it.
      https://ddmetalproducts.co.uk
      http://www.davekearley.co.uk

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