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Type: Posts; User: Eldon_Joh

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  1. Re: 16/3 @ 18 AMP per conductor - for VFC Cable ?

    2.2kw at 110vac 3 phase is only 11.5 amps. 16 gauge is fine.

    a vfd delivering 2.2kw from 120vac single phase (with a dumb rectifier and capacitor input filter) will draw as high as 30 amps rms...
  2. Re: Getting single phase 220v and 110v from 3 phase 220v

    why not just run your neutral through the phase perfect and wire up a
    L21-20R plug.

    if you're too lazy to add another 3 phase contactor in your machine so you can power off the spindle and servo...
  3. Re: Getting single phase 220v and 110v from 3 phase 220v

    you likely do not need 120vac for your computer. many are 100-260vac, they take the incoming ac and convert it to 400 volts dc.

    the older computer power supplies have a switch you need to set for...
  4. Thread: Concrete VMC

    by Eldon_Joh
    Replies
    135
    Views
    6,798

    Re: Concrete VMC

    i believe that. but my comment regards my own experience of bolting a 20mm rail to about 1/8" or 3mm of system 3 mirror coat.

    under a 20mm rails there are only two, about 5 or 6 mm wide contact...
  5. Thread: Concrete VMC

    by Eldon_Joh
    Replies
    135
    Views
    6,798

    Re: Concrete VMC

    i recommend just lapping the top of the X axis rails flat. epoxy a strip of steel just as wide as the rails so you don't need to remove any more metal than necessary.

    to get the twist out of it,...
  6. Re: Increasing torque with high power 380V spindle on a low power 220V VFD ?

    you can do that, but i would buy the 4.5KW spindle if you need to get 1.8nm of torque continuously.

    you will need to program the vfd correctly so as to get the most torque for the least amount of...
  7. Re: Repair and upgrade of high voltage power supply

    i'm not sure its worth your time or money to attempt to drive a 100w tube from a 50 watt power supply.
  8. Re: Repair and upgrade of high voltage power supply

    did you burn out the 50 watt transformer?


    if you can verify the 100 watt flyback has the same turns ratio, you may be able to change the air gap of the core so that they both have the same...
  9. Replies
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    218

    Re: Ballscrew and nut mismatch

    there is a chance you can fit oversize bearings into it but the oversize bearings are going to contact the nut in only the outer portions of the helix, so its going to wear out quickly, literally...
  10. Re: DIY Power drawbar what are the options...

    the wide flange is revealed if i'm not mistaken and needs to contact the face of the spindle nose, not the collet.

    what you saw on the ebay link.. you could add a flange to that but i find it...
  11. Replies
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    5

    Re: China Spindle Cooling

    you have a dc brushed motor, so yes pulling air through the air gap between the rotor and the magnets is going to be 10 times more effective than simply cooling the outer casing of the motor.
  12. Re: im upgrading my taig spindle motor to a clearpath AC motor... will it work?

    with a counter weight you can use as large a motor as you want.

    as for the taig being stiff enough, forget it.


    replace the 2.5" square steel L frame with 100 pound box beam made from 6" or...
  13. Replies
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    5

    Re: China Spindle Cooling

    or use the 24v fan but epoxy a finned heat-sink onto the side of the motor.


    or drill larger holes in the motor case to get more airflow through the motor, or 3-d print a better shroud to suck...
  14. Replies
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    5

    Re: China Spindle Cooling

    i'm not op but i'd try to balance the existing blade or replace it with an aux fan before waiting 3 weeks for a new fanblade.
  15. Replies
    33
    Views
    5

    Re: China Spindle Cooling

    doesn't make a damn bit of difference.

    i had a friend of mine 3d print a fan blade for a vacuum cleaner motor, 6" diameter, probably ran at 12,000 rpm.
  16. Replies
    33
    Views
    5

    Re: China Spindle Cooling

    he reminds me of digger doug on practical machinist, always defending thermite, who got banned.


    anyhow while it would be a challenge to ballance a 3d printed fan blade for maybe 3" diamter at...
  17. Replies
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    1

    Re: V-Rail vs Linear Guide Rail

    are the v rails and their roller bearings arranged properly or are they subject to slop in the bearings.

    and even if they are subject to slop in the bearings are the bearings doubled up and...
  18. Re: 8,000# Machine Delivery on Asphalt Driveway

    Just build a skid and drag it into the garage, have the rigger drop the machine on the skid. use your car to pull it, just need some folks to pickup the broom handles and lay them out in front of the...
  19. Re: How to Set up a Huanyang VFD and 2.2KW Air Cooled Spindle

    The shield should be grounded at both ends from the vfd to the motor. depending on the nature of your machine its also good to ensure an extra ground path from the motor to the frame of the machine,...
  20. Re: help with spindle motor winding resistance 10hp

    so usually induction motors draw about 30% nameplate full load amps at no load.

    a 15KW motor pulling 100 amps at no load, sounds like you have saturated the motor by applying too many volts per...
  21. Re: help with spindle motor winding resistance 10hp

    synchronous motors such as most "sevos" are permanent magnet, of course you can't just plug them in.

    if they have a shorted turn they will cog and be difficult to rotate by hand, but still produce...
  22. Re: help with spindle motor winding resistance 10hp

    its a 200 volt motor. will run fairly saturated on 240v 3 phase. no reason you couldn't just plug it in and see if it runs though.

    if there is a shorted turn in a 10hp motor you should see a lot...
  23. Replies
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    201

    Re: 500w chinese spindle interference

    You should be able to use an emi filter on the 0-10 volt command going into the spindle controller. depending on the type they are typically CLC filters, 4.7nF to ground on both phases, a 1-10mH...
  24. Replies
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    201

    Re: 500w chinese spindle interference

    is this a brushed dc motor with pwm controller?
  25. Re: Can a 2.2kw 20,000 RPM water cooled spindle be indexed if coupled to an encoder?

    there is no intrinsic problem with using a cheap 2.2KW Chinese spindle for indexing..

    the problem is simply $$$ and time to setup a servo driver configured for an induction motor (a relatively...
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