I connected the belt to the carriage.
End pulley connected
Motor end and belt spreader
MOTION UP AND DOWN WAS SMOOTH - BUT BELTS FALLING OFF THE END PULLEY - UPON MOVING THE CARRIAGE UP AND DOWN - TWO TURNS OF THE END PULLEY!!
ON ALL THREE SIDE ASSEMBLIES!!
I tried flipping the motor gear - SAME thing - keeps coming off the end pulley at top.....
I then read - http://reprap.org/wiki/Rostock#Belts
Belts
It can be challenging to get good belt tension. You should be able to pluck nice bass tones on the belts. Here is Johann's tensioning method:
- Make sure you don't have a flange on the outer idler bearing (the one that is facing you).
- Put timing belt on motor pulley and idler bearings.
- Push idler end up as far as possible with one hand.
- Remove belt from idler bearings.
- Push idler end up 3 mm more and tighten screws on smooth rod.
- Put timing belt on idler again. It will be very tight.
- The idler bearings are tilted 2 degrees upwards, so your belt should not fall off even though the outer bearing has no flange.
- If the belt does fall off, reduce belt tension slightly, or print a new idler end with increased upward tilt...
Important note - last two statements -
- The idler bearings are tilted 2 degrees upwards, so your belt should not fall off even though the outer bearing has no flange.
- If the belt does fall off, reduce belt tension slightly, or print a new idler end with increased upward tilt.
I did not know there was a slight angle - also noticed the screw holes where the endstop will mount - I INSTALLED ALL THREE END PULLEYS UPSIDE DOWN!!!! HAHAHAHAHAHHAAA!!
Flipped them 180 degrees AND WORKS LIKE A CHARM - belts not coming off!!!
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