Great Information!
It looks like all the steppers used for these sorts of projects are about 2.8V, with the amperage increasing with the torque. I wonder if it would be worth it to explore using a higher voltage/lower amp motor? There are also some of these for sale.
The better steppers being used for upgrades appear to all have a torque of about 44, expressed in either g/cm or Ncm. For anyone interested here is an good link for converting torque to a different scale.
http://www.numberfactory.com/nf_torque.html
There are some heavier motors with holding torque as high as 65 or 80, but be cautious of the overall length which increases with more torque. There is only so much room in the ultimaker for the X and Y steppers (about 55mm or a little more), the motors at ~44Ncm seem to all have a length under 50mm so should be a safe bet.
Let us know how your upgrade turned out,
Cheers!
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owen 19
Hi
This is the spec sheet for the ones that were in my UM (Sticker on the side says SY42STH33-1334A), which are bi-polar
http://www.slidesandballscrews.com/pdf/steppermotors/SY42STH33-1334A.pdf
I've got http://www.slidesandballscrews.com/pdf/steppermotors/SY42STH47-1684B.pdf
which I got from http://www.mendel-parts.com/index.php/stepper-motor-nema17-incl-molex-connector.html
By the spec sheet voltage is the same and the current and torque is higher, which is what you want. Having the same step angle is preferable but you can get around this with settings I think.
They have a bit of shaft hanging out the back so they're not ideal but they do fit.
I have tested that they spin when connected and operated from the control panel and am in the process of mounting them.
Hopefully I will be using them tomorrow.
I can let you know how they go if you like.
Let me know if you need any explanation of any part of the spec sheets. I have a basic understanding and did a lot of research yesterday.
I noticed those Motors were out of stock from Ultimachine and was thrilled to find these ones I already have will probably work.
Owen.
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