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  1. #91
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    As my mill will direct drive using the G540 with 2 motors the Y axis, 1 on the X and 1 on the Z.... what size motors would be suggested? With 5mm pitch ballscrews on all axis? From geckos website.. it appears I really have a choice of either 269oz or 387oz to keep with the inductance range.

    Brad.

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  3. #92
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    May 2003
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    Perth WA
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    Hi Brad,
    Thanks for the tip on the seals.

    You have asked a question with only half the required information. If you go on the Gecko site there is a white paper on how to calculate what size motor you need.

    Looking at your machine from earlier photos I would go the 387oz/in motors but don't take this as being absolutely correct and run through the calcs on the Gecko site to be sure. You could probably run a 269 on Z but hardly worth the small saving you would make.

    Are you using a 48 volt power supply for the Gecko?
    Cheers,
    Rod

  4. #93
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    Geelong
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    Yep... 48volts.

  5. #94
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    May 2003
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    Perth WA
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    Ok you should get good speed from 387's with 48v so that is probably the safest path for you to go down.

    Do you call the longer axis Y axis?
    Cheers,
    Rod

  6. #95
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    Location
    Geelong
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    Actually, I usually call it the X axis but on my currently little CNC the Y axis controls the forward and backward movement so Im kind of muddled...lol.

    Just reading the Gecko stuff now....

    http://www.geckodrive.com/upload/Ste...cs%20Guide.pdf

    but for the time being I'll get it running with the 269oz's. I'll need to consider the larger size of the 387oz motors in the design process though.

    These motors seem a reasonable price..

    387 Oz-in Nema 23 Stepper Motor "CNC Router, Mill" - eBay, Electronic Modules, Kits, Electrical, Industrial. (end time 14-Sep-10 01:24:14 AEST)


    Brad.

  7. #96
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    May 2003
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    Perth WA
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    Or you can deal with him direct here
    Chris like Peter Homann have earnt my respect by their honesty and support of this community. Both of them have donated gear and their products are competitive so why not give them a plug.
    Cheers,
    Rod

  8. #97
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    May 2008
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    Geelong
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    Cool... I'll deal with him direct. No point paying ebay a commission if it's not needed. Is he on these boards?

    Brad.

  9. #98
    Join Date
    Jul 2006
    Location
    Port Huon
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    2,685

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    Quote Originally Posted by spidey4fun View Post
    Cool... I'll deal with him direct. No point paying ebay a commission if it's not needed. Is he on these boards?

    Brad.
    He is indeed. Username ch4is

  10. #99
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    Feb 2008
    Location
    Australia
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    988

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    I'm always lurking around these parts

    Its interesting to see the different takes on how people go about building a cnc router.


    BTW I would go with the 387's as well as rod has suggested, they are the best match for the G540 driver.

  11. #100
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    May 2008
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    Geelong
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    Cool... I just emailed you.

    Brad.

  12. #101
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    May 2008
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    Geelong
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    387oz motors arrived today. Thanks Chris. Now I need to do some alterations to my motor mounts. And make some new leads with 3.5k resistors for the Gecko.

    Brad.

  13. #102
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    May 2008
    Location
    Geelong
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    The stepper motor brackets seem to work. Made on my little CNC.



    I had to put a 6mm spacer under the bearing to provide enough space for the 387oz motors.



    Next was tapping a few holes.... and snap!!! I broke my first tap. Good thing I got a $50 Mitre 10 voucher off my little boy today. Happy Fathers Day!!!



    I need to get some longer bolts to hold the bearing / motor in place. When I purchased the bolts I hadn't planned on the 6mm spacer for the larger motors. Apart from that it seems to be going to plan so far. Now to do the other side.

    Brad.

  14. #103
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    Hi Brad,
    Coming along nicely there.
    Cheers,
    Rod

  15. #104
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    May 2008
    Location
    Geelong
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    IT"S ALIVE!!!!! Completed the other side today.




    I started it at 200mm/min and increased it to 2000mm/min with acceleration at 30mm/min. Not sure what to run it at really. What's the norm for something this size and weight?

    I think the ballscrews need some greese? They came with some nibs which I've yet to attach and I've not put anything on them since I purchased them a few years back. Does anyone know what the maintenance schedule is? And what to use?

    Brad.

  16. #105
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    Perth WA
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    Hi Brad,
    That is great.
    Double those figures and see how it goes. You know when you have gone too far as the motors will lock up and it makes a grinding noise - no damage done just the steppers locking up and complaining. Have your hand ready on the stop button especially with dual axes as one side may keep going. If it doesn't handle it drop the speed by 500 until it does. You can also increase the speed if it handles it well.
    I get over 9m/min on my machine which is similar to yours but I run a 2 to 1 pulley on the ballscrew. I detuned it to 4m/min as it is a comfortable speed for me. Keep the acceleration up as it is better to have faster acceleration than faster speed.

    If you are running through the parallel port you may have to increase the Kernel Speed in Mach3 before it will let you.
    Cheers,
    Rod

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