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Thread: What did I do wrong?
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07-28-2014, 05:11 PM #25
IIRC, the steps/mm on the extruder is around 860, which is 1/16 microsteps. This means it's about 54 full steps/mm. If you're trying to retract at 25mm/s, this is 1350Hz.
That seems like a lot. Let's try calculating it another way. The effective diameter of the hobbed bolt is about 6mm, so the circumference is about 19mm. 200 steps per motor revolution times 5.2:1 gear ratio divided by 19mm effective circumference equals 55 steps/mm. That agrees, so it's likely about right.
How does this compare to an X/Y motor? A typical 20-tooth pulley has a 40mm circumference, which means 100mm/sec would be 2.5rev/sec. Time 200 steps/rev = 500Hz. So the extruder is moving almost three times as fast during a 25mm/s retract.
Check my math.
We still have the question about whether I have identified the correct motor.
Printer will print perfect...
06-14-2024, 10:44 AM in Tips, Tricks and Tech Help