tag:blogger.com,1999:blog-6573615209338157347.post6288438029730128571..comments2019-11-27T09:04:19.762+00:00Comments on JSR's RepRap Mendel: TechZone Extruder Controller TestingJSRhttp://www.blogger.com/profile/15313808987059484063noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-6573615209338157347.post-41529362191326150232010-07-15T00:00:00.373+01:002010-07-15T00:00:00.373+01:00going to try the kysan 1123029's which seem un...going to try the kysan 1123029's which seem under 2A and makerbot uses and sells. not sure why the SY42STH47-1684B's are listed on the reprap wiki at all given the amp problem. plus, i can't seem to find anybody using them. lambert explains that, unlike the extruder, the axes boards do have a current sensing resistor on them so won't be as quick to overheat... though may eventually.Unknownhttps://www.blogger.com/profile/01841626354373747298noreply@blogger.comtag:blogger.com,1999:blog-6573615209338157347.post-24148099491983852082010-07-14T12:22:01.363+01:002010-07-14T12:22:01.363+01:00This might seem obvious but I assume you have used...This might seem obvious but I assume you have used the pot to trim down the amps? I turned mine all the way down (anticlockwise) then slowly clockwise until I just got movement on the stepper. I have only run the motors for short periods of time - maybe i will have this problem in the future, how long did the chips take to overheat? Was the motor hot to touch? - I still doubt the 7 amp figure, I think my power supply would give up at 5 anyway, but maybe I am wrong, anybody else got ideas for geeksautonomous?JSRhttps://www.blogger.com/profile/15313808987059484063noreply@blogger.comtag:blogger.com,1999:blog-6573615209338157347.post-28113116656159151682010-07-13T15:56:53.286+01:002010-07-13T15:56:53.286+01:00oh, using http://reprap.org/wiki/Suppliers/Stepper...oh, using http://reprap.org/wiki/Suppliers/Stepper_Motors#Zapp_Automation_.2F_SY42STH47-1684B instead. rated 1.68. here's spec sheet: http://www.slidesandballscrews.com/pdf/steppermotors/SY42STH47-1684B.pdf. still, lambert claims the 12 volts raises the amps significantly. anyways, i'm stuck. any ideas?Unknownhttps://www.blogger.com/profile/01841626354373747298noreply@blogger.comtag:blogger.com,1999:blog-6573615209338157347.post-60194580743468827912010-07-13T12:29:00.077+01:002010-07-13T12:29:00.077+01:00Hi geeksautonomous thank you for reading my blog, ...Hi geeksautonomous thank you for reading my blog, are you sure you are using the same motors I am? I had a look on the datasheet for the SY42STH47-1206A steppers and it says the rated current is just 1.2 Amps.JSRhttps://www.blogger.com/profile/15313808987059484063noreply@blogger.comtag:blogger.com,1999:blog-6573615209338157347.post-87455554865890693472010-07-13T02:59:07.958+01:002010-07-13T02:59:07.958+01:00i've got the exact same config (zapp & tec...i've got the exact same config (zapp & tech zone), got the thing built, the axes work, yet the A3949 chips on my extruder board(s) keep catching on fire! it'd be really helpful to know how you are using zapp motors yet not overheating. lambert @ tech zone warned that the board couldn't handle the 7+ amperage of those motors as the A3949 chips are only rated for 2? no need the post this comment, so feel free to delete it. may i dialog with you more directly? thanks.Unknownhttps://www.blogger.com/profile/01841626354373747298noreply@blogger.com