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  1. #11
    Ross77's Avatar
    Lives in Devon, United Kingdom. Last Activity: 3 Hours Ago Has been a member for 7-8 years. Has a total post count of 641. Received thanks 25 times, giving thanks to others 22 times.
    So how is the performance with the original lead screws Clive? can you zero out the backlash in the cross slide?

    Thanks A_Camera, yeah I think I will invest in the cable and brake, they are out of stock now so will have to see how long it takes them to restock before I make my final decision. Having looked at the PID in more detail I think you a right and it is more suited to the slower response of temperature control rather than machine spindle control. How does the jog control work? is it like a servo motor for indexing?

    Thanks M_C. the motor I was planning to use is an inverter duty 4 pole so should be good from 150 to 3000rpm. 2.2kw specs are:

    For Variable Speed use:-
    Part Time Output when Inverter powered is...
    7.30Nm - 2.2kW ( 2.95HP) x 2880 RPM at 100 Hz
    14.59Nm - 2.2kW ( 2.95HP) x 1440 RPM at 50 Hz
    14.59Nm -1.1kW ( 1.47HP) x 720 RPM at 25 Hz
    14.59Nm - 0.22kW (0.29HP) x 144 RPM at 5 Hz
    Continuous Output when Inverter powered is...
    10.4Nm -2.2kW ( 2.95HP) x 2016 RPM at 70 Hz
    14.59Nm -2.2kW ( 2.95HP) x 1440 RPM at 50 Hz
    12.40Nm - 0.94kW ( 1.25HP) x 720 RPM at 25 Hz
    7.30Nm - 0.11kW (0.15HP) x 144 RPM at 5 Hz

    The lathe is only 125mm centre so not much capacity for large stock and low rpm. I was more looking for indexing at low speed. I will check the cutter forces though.

  2. #12
    So how is the performance with the original lead screws Clive? can you zero out the backlash in the cross slide?
    I don't zero out any backlash because I find that on the lathe you (or I) always back off from X at the end of the cut run and then then any backlash is taken up when you start the next cut. If that makes sense. The conversion I did was from this guy http://www.jeffree.co.uk/modelengineering.html
    ..Clive

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