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#1
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How many motors use mechmate in the long axis
Hi, I'm gonna build a mechmate and I want to know how many motors use mm in the long axis, 1 o 2?, Right now I have 3 740 OZin Stepper motors, thank you for the help and sorry for my bad English
Alberto |
#2
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2 motors on long axis. You need 4 motors total.
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#3
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Well it depends on which is the long axis. Commonly 2 but if your Y is longer then your X (mine is) then the answer is 1.
Alberto, those sound like powerful motors for a MM. |
#5
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Hi
So, do you think that 2 stepper motors of 740 oz-in are to big for my long axis??, I have 4 stepper motors of 740 oz-in, what do you thing about my motors??, sorry for the english jaja
Kind Regards Alberto |
#6
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Alberto, do you have any of the electrical data for the motors. We can help you better if we know exactly what you have. Normally, a 740 oz*in motor should work fine. It is probably very similar in size and capability to the Oriental Motor PK299 motors that I've tested.
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#7
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Hi Richard
the motors are RHT34-740 from http://www.homeshopcnc.com/RHTstepperMotors2.html The data information that I have is: Motors are 4 Lead parallel configured, 2 phase, 1.8 degree step angle HOLDING TORQUE Nm 5.2 (740 oz-in) Rated Voltaje 2.0 Rated current per phase (amps DC) 6.0 Resistance 0.33 INDUCTION mH 2.7 Rotor Inertia g-cm2 1400 I hope that you can help me with this information, thank you! Kind Regards Alberto |
#8
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Besser read 3740 oz.in per motor, instead of 3 motors at 740 oz.in each.
Looking at the homeshopcnc link, the motors are 78mm long and weigh 2.3 kg. That immediately suggests single stack, and a rotor inertia of 1400 g.cm^2 confirms it. (equivalent Oriental Motor is the PK296 series). It is highly unlikely that the 740 oz.in is possible from these motors on a permanent basis without damaging them. These motors will not be suitable as direct-drive motors for the MM, but with 3:1 belt reductions, you could be okay. |
#9
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Hi Gerald,
Thank you for your quick response, I donīt speak English very good.. sorry XD, single stack is a bad thing?, I donīt understand this: "It is highly unlikely that the 740 oz.in is possible from these motors on a permanent basis without damaging them" Could you explain me this with single words jaja, I understand that I need a 3:1 belt reduction system but I donīt understand why and I have one question jaja, my MM with that motors and the 3:1 belt reduction gonna works fine and fast or it gonna be slow??? Thank you! Kind Regards Alberto |
#10
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Sorry Gerald I donīt ask you one thing..
Can I use the RHT34-740 Oz-in on direct drive with a ballscrew?, because my Z axis gonna be with ballscrew.. or I need belt reduction in the Z Axis too? Thank you |
#11
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Alberto, I have no experience with those motors, and I have no direct experience with ballscrew drives on router tables, so I can not answer all your questions.
Simple language: I do not believe the specification of 740 oz.in that is given by the supplier. I think it is a lot less. (maybe 500 oz.in max?) If you fit a pinion gear direct to that motor, and run it direct on the rack, then the performance will be bad. If you use belt-drives with that motor, I think you will be okay. I never make promises of speeds. |
#12
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2 motors on X axis
I know ive read somewhere regarding keeping the 2 steppers working together on the x axis but cant find it anymore...can someone please point me in the right direction.
thanks |
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