Thread: NordicCNC's build log
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07-05-2020 #141
What kind of signal wires are recommended between the controller and AC servo drives? Would ethernet cables be good? Also do they need to be shielded?
Cat5 or Cat6?
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08-05-2020 #142
Most AC servos have manufacturer made cables between the motor and drive.
Are you taking about within the control box? Or outside?
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08-05-2020 #143
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08-05-2020 #144-use common sense, if you lack it, there is no software to help that.
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Web site: www.jazzcnc.co.uk
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10-05-2020 #145
Hi,
from #111 "Perhaps I could change the design and use only 1 servo motor on the Y-axis with belt drive connected to both sides. This in turn will not allow for squaring the gantry with motion controller but I think i can get it square any way."
I am face to the same question and first thought is doubling motor + driver + home switch is a costly option compare to 1 motor + belt drive... Have you develop the track of 1 motor for the both Y with belt drive ? Could you advice buildLog of thread that discuss this point ?
Regards
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10-05-2020 #146
No I didn't go for that. I did alrady buy the components fpr dual drive Y-axis and they are being shipped currently. I never looked into the design either. I bet it could work, but perhaps it is not ideal in my case for a 1200mm gantry!
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19-05-2020 #147
Status update.
I have ordered all parts and have now received linear rails and ballscrews from BST automation. Stuff looks high quality, but to my unpleasant surprise I ahbe received 2005 ballscrews instead of the requested and quoted 2010 ballscrews... Looks like I will only be getting 7.5m/min rapids now...
I will try to sort this out with Fred, but my expectations are not high. I am not sure how it works with returning the parts. I already paid extremely expensive shipping (due to current world situation) and rip off custom clearance.. Feelings are not the greaterst right now, downgrading from 15m/min to 7.5m/min.
As mentioned earlier in the build log, I will be using servos rated at 3000rpm, with a 2:1 ratio to limit ballscrew rpm to 1500. As I said, I have also already ordered belts and pulleys for that gearing. Fuck. Rant over.
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19-05-2020 #148
Are you sure there aren't just two threads on the screws? I initially thought the same thing, then realised if I follow one helix it goes 10mm in one rotation.
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19-05-2020 #149
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19-05-2020 #150
No they will be correct, they are twin start screws. If you look carefully at the end you will see multiple threads, but it's easy to check just rotate the ballnut and measure how far it moves.
It's a common mistake.
The reason they use this method is it gives higher torque and lessens the depth required and keeps the screw stronger.-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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