ON 20110217@9:50:05 AM at page:
On a web page you were interested in at:
http://www.piclist.org/Techref/io/stepper/linistep/faq.htm#40591.4097800926
Antonio Jorge Augusto[AJA-netvisao-] Questions:
Hi
I've just finish the linistepper board a, during the test, the stepper motor gets very hot and i've tested only without step signal an the mototers still gets very hot. I use a desk printer motor to test with 12V. This behaviour is normal or do you have any ideia about this problem?
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ON 20110223@9:39:17 PM at page:
On a web page you were interested in at:
http://www.piclist.com/io/stepper/linistep/index.htm#40597.0149884259
James Newton[JMN-EFP-786] Published and replied to post 40597.0149884259
|Insert 'Thanks for the excellent point and example. Heat in the motors can also cause a loss of torque and lead to skipped steps. For a medium to small CNC machine, the Linistepper is simply the best. Having said that, honestly, for an axis that really needs 5 amps, go for a Gecko Drive. The only other option would be to counterweight the Z axis to try to reduce the power needed or increase the TPI (reducing speed) of the lead screw.' at: ''
To all the people who consider the heat trade-off of this great linear drive vs. choppers. As you've read here choppers heat the motor and linear drive heats the drive transistors. The awful, awful disadvantage of a hot motor is the likelyhood of a hot ballscrew, heating the ballscrew causes your parts to grow and holes made in a different position when hot than when cold. Not many people would notice the difference but when making parts with a tight tolerance, it's amazing to see a difference in position from morning to afternoon, and then afternoon back to nighttime. Linear drives are the way to go for accuracy. Some metal cutting machines even have coolant running thru the leadscrew to eliminate any drift due to heating. Im changing all my drives to linear. Well, almost all. My Z axis motor is a powerful 5Amp. Is it possible to use two linear drives wired in parallel or would experimenting with overkill replacement transistors?
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