Thread: Earthing?
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15-01-2017 #31
Thanks Clive.
The 3.1Nm motor would draw a maximum of 4.2A, but we all know that in reality it's probably about half of that anyway.
So a cable of 1mm2 (normally rated for at least 10A) will more than cover this. However, I wonder if there is any benefit in using a thicker cable, other than robustness...or obsession:)
I like the motor covers with the glands. Is this something you printed yourself, or are they readily available for the Nema23 frame? BTW, my Z motor is to the side of the column, just like in your picture.
Edward
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15-01-2017 #32
I notice that Robocutters do sell similar motor covers
https://robocutters.co.uk/proddetail...CoverKitNema23
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15-01-2017 #33
I printed these a few years ago but since then I have milled them from various blocks of plastic including those fencing posts made from car tires. If you do a search for hem I have seen them in Europe somewhere
https://www.hardware-cnc.nl/en/winke...nema-23-detail
http://www.thingiverse.com/thing:243126..Clive
The more you know, The better you know, How little you know
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The Following User Says Thank You to Clive S For This Useful Post:
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15-01-2017 #34
Now't wrong with a bit of healthy obsession
Thin cable is fine and dandy if you were lighting a bulb or charging your iPhone with a bit of AC but this cable has more to do than that.
On the other end of it is a hefty inductive load, it may have tuned itself a bit to reduce the peak but sooner or later it is going to want to reverse the current in a coil winding PDQ. It will try to control that current using a chopper circuit which depends on measuring the current flowing some way away. Did you fit the optional braking resistors?
Fat, low resistance cable takes the strain off more expensive components.
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15-01-2017 #35
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15-01-2017 #36
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15-01-2017 #37
Hi Dean
I knew you would be along to explain why everyone seems hell bent on screening and tin boxes despite the problems they cause. This is something that has bothered me for some time, a trap I think I have fallen in to myself.
Ready when you are, I am all ears...
Robin
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15-01-2017 #38Did you fit the optional braking resistors?
Last edited by Clive S; 15-01-2017 at 11:53 PM.
..Clive
The more you know, The better you know, How little you know
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15-01-2017 #39
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15-01-2017 #40
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