1 Topic by mdrVB6

  • mdrVB6
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Topic: Source for Y-motor?

Does anyone know where I can buy a new Y- motor?  I was attempting a carriage replacement when I stripped the threads on the motor... yes, I stripped the threads.  Apparently, the motors solidoodle uses are so cheap that the metal is soft enough that the thread came out with the screw on two of the holes! I've found several motors online but they all have the threads on the top instead of the bottom like I need.  I'm getting a lot of Y-skip with it only held in by two screws, it is obviously not tight enough.

Also, is it NEMA 14?  Any other size info?  Of course it is available from solidoodle for double or more the price of similar parts elsewhere but I would prefer to avoid them.  I'm also getting some stainless steel M3 cap screws instead of the soft black metal allen screws that are easy to strip. 

Thanks!

SD4 w/ RUMBA, E3D Volcano, all bearings, glass bed

2 Reply by fxdata

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Re: Source for Y-motor?

I found this information on another website. The Y motor is a NEMA-17 model number SM42HT33-1334A. Hope this helps.

             
SM42HT33-1334A
Rated Voltage         2.8V
Current/Phase           1.33A
Resistance/Phase      2.1 Ω   
Holding Torque         30 Oz-in    2200 g-cm
#Of Leads                4
Rotor Inertia            35g-mc2
Weight                     0.22Kg
Length                     33mm

3 Reply by mdrVB6

  • mdrVB6
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Re: Source for Y-motor?

Thanks for the info, I found that on soliwiki too.  I got a little closer on this site:

http://www.omc-stepperonline.com/steppe … -1_21.html

but they are in China and still don't seem to have the exact one.  It seems to be hard to find them without a D cut shaft and near impossible to find if it has mounting holes on the bottom.  Looks like I'll be forced to order from solidoodle but if anyone has other suggestions I would still like to hear it.

SD4 w/ RUMBA, E3D Volcano, all bearings, glass bed

4 Reply by pirvan

  • pirvan
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Re: Source for Y-motor?

If you're going to change the motor, you might as well get an upgraded one with more torque.  I would get a Kysan  1124090.  Those motors have more than double the holding torque of the SM42 above (5.5Kg/cm), and they're only about $15.00

You can get them from Printrbot, or from Ultimachines
http://printrbot.com/shop/large-kysan-motor/
https://ultimachine.com/content/kysan-1 … pper-motor

It's a slightly bigger and heavier motor, but since it's stationary, you don't have to worry about the weight.  I used one for my extruder motor, and it runs a lot cooler because it doesn't have to work as hard.

To print or, 3D print, that is the question...
SD3 printer w/too many mods,  Printrbot Simple Maker Ed.,  FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.

5 Reply by mdrVB6 (edited by mdrVB6 2014-04-08 17:32:23)

  • mdrVB6
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Re: Source for Y-motor?

pirvan wrote:

If you're going to change the motor, you might as well get an upgraded one with more torque.  I would get a Kysan  1124090.  Those motors have more than double the holding torque of the SM42 above (5.5Kg/cm), and they're only about $15.00

You can get them from Printrbot, or from Ultimachines
http://printrbot.com/shop/large-kysan-motor/
https://ultimachine.com/content/kysan-1 … pper-motor

It's a slightly bigger and heavier motor, but since it's stationary, you don't have to worry about the weight.  I used one for my extruder motor, and it runs a lot cooler because it doesn't have to work as hard.


Have you confirmed that these motors have threads in the bottom so that it can be mounted on the solidoodle case?  The picture on the printrbot site seems to show a screw holding the case together on the bottom. 

Also, what calibrations would I need to do?  I assume I could just get out my calipers and measure how much the carriage moves and change the number of steps per mm in EEPROM as necessary?

SD4 w/ RUMBA, E3D Volcano, all bearings, glass bed

6 Reply by pirvan

  • pirvan
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Re: Source for Y-motor?

All these motors have screws that hold them together from the back.  All you will be doing is removing the screws, then putting back through the holes and back into the motor.  The motor guts are held together magnetically, and the housing is tightly fitted so it won't come apart when you remove the screws.

The only possible concern would be the length of the screw, since you have to take the thickness of the frame, the washers and the motor's back cover inset into consideration, all in all about 4-5mm.  So you might want to look for some M3 screws about 52mm long, although, I think the existing screws should work.

You are replacing a NEMA17 motor with a similar motor but with more torque, so you might want to change the stepper driver current (it will probably require slightly less current than the existing motor), however I don't think that would be a requirement.  As far as calibrations, you should always do those every time you make any changes to the printer.

To print or, 3D print, that is the question...
SD3 printer w/too many mods,  Printrbot Simple Maker Ed.,  FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.