[ward2699]

i just reduced my drive to 1:3 and now my motors stall. prior to this i was running them direct ....... any help to why would be greatly appreciated

[BTA PLASMA]

If your using smaller motors and this happens your accel rate may be too high.

[flyinwilly]

Sounds like the motors are running too fast. With the 3:1 reduction, they will have to turn 3 times as fast to get the same cut speed. Try reducing the cut speed and see if it helps.

Willy

[Torchhead]

You must:

Reset your Steps per unit (motor tuning) Re-run your calibration tests to make sure you are moving 1" for a 1" command in MACH.

Lower your Velocity setting to 500 - 600 IPM (depends on the motors and pinion specs)

Run your acceleration lower UNTIL you get the other tuning done then bring it up 5 IPS/sec per time.


The goal with belt reduction is to trade the speed you don't need for torque and resolution you do need,

Physically the motors will only spin just so fast (PRM) If you leave them at some high velocity (like 1000 IPM ) then add a belt reduction you would have to spin the motor at about 1000 RPM to get that spped and it stalls (No can do)

[ward2699]

thanks guys for the repleys. i increased my v-ref to motors and it seemed to help. i can get about 350 IPM ok. but prior to the reduction i was getting like 750+ IPM. also now 1 rev=1 inch. my motors must suck. whats the max rpm these things will spin?

[Torchhead]

Motor RPM is totally dependent on:

motor drive voltage. (24V RPM is 1/2 of 48V RPM given the same motors)
motor drivers
motor inductance (to an extent)
kernal speed of MACH3 (limits max steps per second)