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Thread: G540 & CNC Build
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27th August 2010, 10:54 PM #91
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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27th August 2010, 11:59 PM #92GOLD MEMBER
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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
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28th August 2010, 12:10 AM #93
Yep... 48volts.
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28th August 2010, 12:26 AM #94GOLD MEMBER
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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
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28th August 2010, 12:39 AM #95
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.
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28th August 2010, 12:54 AM #96GOLD MEMBER
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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
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28th August 2010, 10:41 PM #97
Cool... I'll deal with him direct. No point paying ebay a commission if it's not needed. Is he on these boards?
Brad.
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28th August 2010, 11:00 PM #98GOLD MEMBER
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28th August 2010, 11:48 PM #99SENIOR MEMBER
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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.
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29th August 2010, 11:28 AM #100
Cool... I just emailed you.
Brad.
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1st September 2010, 09:36 PM #101
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.
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5th September 2010, 11:07 PM #102
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.
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6th September 2010, 12:19 AM #103GOLD MEMBER
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Hi Brad,
Coming along nicely there.Cheers,
Rod
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7th September 2010, 01:32 AM #104
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.
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7th September 2010, 01:50 AM #105GOLD MEMBER
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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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