Thread: new build opinions required
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10-12-2013 #1
finally getting on with this.
Going for a rig thats 2000mm double x 1200mm y 300mm z
ordered this lot
supported linear rails SBR20-300/1200/2000mm rails(6 supported rails+12 SBR20UU bearing blocks)
4pcs of ballscrews RM1605-350/1200/2000/2000mm overall length-C7(4screws+4ballnuts+4end-machinings)
4 SETS OF BK/BF12(with locknuts and cir-cplis)
4pcs of flexible couplings 6.35mm*8mm
am building a base similar to the above mentioned thread, with a few modds for rigid bed
am going for duel x motors, so heres my first question.
There now seems to be nema23 and nema24 motors, with the latter having more power eg
4 Axis Nema24 Stepper Motor 567oz-in CNC Controller Kit With Display And Keypad | eBay
so, is it worth the extra for the nema 24s, or is there something am not seeing ?
I want the Y gantry to be heave duty so i can maybe strap a B/C head on,
question 2 would a nema24 be overkill for a y axis at 1200mm travel, would i be better of with nema23
Question 3, i want to build a heavy duty rotary table on part of the bed, for stone carving. would nema 34 cause me any problems with lighter weight things like wood or foam and what gearing would you recommend.
i sort of need to order the motors over the next 2 days
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11-12-2013 #2
YES your not seeing plenty.?
First the only difference between Nema 23 & 24 is physical outer Dim 23=57mm 24=60mm both have the same Bolt centres so both can be used on same mount.
The Difference you'll be seeing between them is Holding torque, Probably 3.1Nm and 4Nm.
Now the thing you don't realise is that what's important is the Inductance rating and often the larger 4Nm motors have much higher inductance than the lower 3.1Nm and this means they don't perform has good.
Now the Motors Eddy linked to seem quite Low inductance for 4Nm if that is indeed true.?? But most of the 4nm Chinese motors I've encountered have been quite High and IME the slightly lower 3.1Nm motors perform much better.
Now it seems to me your Rushing and not really knowing what your buying or what Mass you have to move.? This is a recipe for disaster and you will end up buying the wrong stuff if your not careful.!
The Kit you linked to is a prime example, it's Rubbish and completely wrong for your needs. The Drives are Rubbish junk, The PSU is way to Low voltage at 36V for those motors you'll end up with a very low performing machine. Thou this won't be too much of a problem thou has the drives will probably have died in short time so it won't be going anywhere.!!
Honestly I'm not just being Negative or pulling down but please take a Step back put a foot on the brakes and assess what you need better otherwise you'll regret it and waste shit load of money.
I'll PM you my number if you want to ring me and I'll try to help.
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