Thanks Thanks:  0
Likes Likes:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Results 1 to 5 of 5
  1. 25th July 2011, 05:04 PM #1
    Breastfed
    Breastfed is offline Novice
    Join Date
    May 2011
    Location
    Thailand
    Posts
    12

    Default Mach3 Motor Tuning & G540

    Hi
    I've been messing around with the motor tuning in mach3 trying to get rid of a motor vibration on all 3 axis. It's not ready to start making chips just yet only cutting air so with a rapid jog its nice and smooth and like wise small slow movements and steps are also acceptable but the mid range feed where I'd be expecting the cutting is noisy and vibrates of course there is no load just the weight of the Gantry.

    I've been adjusting the trim but the noise & vibration makes it hard to listen to that sweet spot.

    my setup...
    G540 (rev4).
    Lead Screws / 15mm pitch, single start, x,y / 10mm on the z axis.
    Wantai Motor / 85BYGH450D-007 / 1.8deg, 6.4volt, 2.5amp, 15mH, 8 wire.
    Power supply / 47v 15amp unregulated
    Each of the motors are wired in series with a 2.2k ohm resister soldered into the back of the DB9 male connection to the G540 end of the harness to each motor. I figured I'd not run the max 2.5 amp just yet for fear of the smoke getting out.

    Also can someone please shed some light for this .... the 2.5amp rating per phase is this for a series or parallel configuration , I'm a little confused when I read through the GeckoDrive "Step Motor Basics Guide" the description that makes reference to figure 10, 11 and 12 has got me scratch my head.

    >>from the step basics guide



    Remember to set the drive current to exactly half of the motor’s rated parallel (as wired in Figure 11) current rating when using the series connection shown in Figure 12. <<

    appreciate the help
    Breastfed
    Reply With Quote Reply With Quote
  2. 25th July 2011 05:04 PM # ADS
    Google Adsense Advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many





     
  3. 26th July 2011, 10:08 PM #2
    Thunknker's Avatar
    Thunknker
    Thunknker is offline Senior Member
    Join Date
    Dec 2007
    Location
    Emerald (QLD)
    Posts
    106

    Default

    Been a while since I set mine up, but I just skimmed back through the users manual, and I also read the part you quoted on the web and unless your motor spec sheet lists the parallel and series current rating I'm fairly baffled as to whether they mean rated current can be doubled for parallel or must be halved for for series, but I'd lean towards the latter to be safe.
    I wired my motors in parallel and run them at close to max rated G540 current which is a little less then their rated current and have not experienced any of the problems you describe.
    I tried tuning with the trim on the drives, but couldn't notice any difference so I just tune the curves in Mach 3.

    Perhaps you could try rewiring one of them in parallel and see if this solves anything.
    Simple solutions are only simple in hindsight.
    See my rig here- https://www.woodworkforums.com/f170/my-junkbot-123715/
    Reply With Quote Reply With Quote
  4. 26th July 2011, 11:46 PM #3
    Breastfed
    Breastfed is offline Novice
    Join Date
    May 2011
    Location
    Thailand
    Posts
    12

    Default

    I read that passage a few times .... it needs a tweak .
    btw my mistake these motors are 2 amp not 2.5. and that mean's I've been pumping approx 2.2amp i don't know if this would cause the problem with vibration and noise that I'm experiencing , just a thought.

    Today I was thinking about trying the parallel connection setup and now you've mentioned it so I'll give it a go and see how.

    what wiring configuration do most folk here use with there motors, is it series or parallel ?

    Breastfed
    Reply With Quote Reply With Quote
  5. 27th July 2011, 02:40 AM #4
    Breastfed
    Breastfed is offline Novice
    Join Date
    May 2011
    Location
    Thailand
    Posts
    12

    Default

    Woohoo, definitely runs better being configured with a parallel setup and its still only limited to 2.2 amps .. however I did actually discover that the problem is with the A axis driver so this will need replacing. I've moved the x axis over to the A axis port and it's running sweet.

    Wow these G540's run warm just messing about .... I've got a finned cooler ready to mount to the back of this G540

    Breastfed
    Reply With Quote Reply With Quote
  6. 27th July 2011, 08:24 PM #5
    Thunknker's Avatar
    Thunknker
    Thunknker is offline Senior Member
    Join Date
    Dec 2007
    Location
    Emerald (QLD)
    Posts
    106

    Default

    Strange you say that about the G540. I was worried for a while with mine at the beginning and even messed up the current limit resistor values and was running max current with no limiting until I noticed the motors were getting really hot, but the G540 never got more than warm (another testament to the G540 idiotproofness).
    It's been running 2 years now with no fan or heatsink touch wood and no probs.
    I'm glad you have had some success with your setup and hopefully soon we'll see some video of it cutting more than air.

    Cheers,
    Simple solutions are only simple in hindsight.
    See my rig here- https://www.woodworkforums.com/f170/my-junkbot-123715/
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Similar Threads

  1. G540 & CNC Build
    By spidey4fun in forum CNC Machines
    Replies: 335
    Last Post: 26th January 2016, 12:47 PM
  2. Can't get motor spinning w/Mach3 & g540
    By Woodlake in forum CNC Machines
    Replies: 19
    Last Post: 17th May 2011, 12:41 AM
  3. Gecko G540 CNC Kits now available
    By phomann in forum CNC Machines
    Replies: 46
    Last Post: 17th January 2010, 06:25 PM
  4. G540 Matched Motors
    By seafurymike in forum CNC Machines
    Replies: 4
    Last Post: 25th September 2009, 02:47 PM
  5. Mach 3 & G540 Motor tuning
    By seafurymike in forum CNC Machines
    Replies: 13
    Last Post: 20th April 2009, 04:24 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules