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  1. #1
    Hi All.

    I already posted this as a reply on another topic, but obviously wasn't the right thread to post on. so here it is.

    I have a WM16 that was converted some 12 years or so ago by John Stevenson (did a great job!) - it was originally a Warco CNC, which was crap (it still had Acme screws and not the ball screws as I had been told - so accuracy was about as far out as the moon!). In the upgrade, John also fitted a 1:1 tooth belt drive from the motor to the gear spindle, so increased the main spindle speed to around 4300rpm max - I run mainly at 4000rpm and has run happily at this. I did have error problems with glitches in communication between the computer and the mill from time to time, but this was solved with the addition of SmoothStepper. Excellent.

    I only use it for small model engineering hobby projects so is not in constant use, but it has done a few hundred hours of reliable running.

    My problem now is that after experiencing a sudden build-up of chatter over a short period, I replaced all the bearings in the head and tightened up all the gib strips. Now I still have a vibration at high speed - removing the belt from the pulley and running the motor by itself, there is a vibration there, although not as much, but still there (it may be amplifying through the gear train) so need to replace the motor.

    Does anyone know of a higher-speed motor (say 5000rpm) that would be a direct replacement for this one? Or will I have to go back to Warco for the motor?

    Regards,
    GeoffB

  2. #2
    I don't know what power you need but over on the Model Engineer forum a few people have mentioned modern brushless sewing machine motors and found them very good.

    https://www.tysew.co.uk/industrial-a...ng-servo-motor

  3. #3
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 5 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,745. Received thanks 331 times, giving thanks to others 8 times.
    I think you'd struggle to get a different motor that would be a direct replacement.

    Is the vibration a mechanic vibration, or an electrical stutter?
    I'm assuming this uses a DC motor, in which case the SCR type controllers can fail and cause motor stuttering.

    Personally, I'd look at fitting a servo motor, but the 5000RPM requirement would likely involve changing the drive pulleys to step up the speed.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  4. #4
    Hello Guys,

    well thanks for the replies. I had a lot of searching and it looks like the direct replacement with higher speed isn't available. I have considered changing to brushless motors, but to be honest I'm wondering whether the time to machine the necessary fittings is worth it as it has done well for a number of years at the 4K+ speed.

    So, many thanks for the replies, but have ordered a replacement from Warco - arrived next day.

    Regards,

    GeoffB

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