I have (2) 12:1 gearheads and "made for" servo motors rated at 60V/Krpm (as seen in above pictures).
I "Plywood-boarded" a power supply giving 95.6VDC and
found the output shaft rotates at 132.8rpm. The motor shaft
therefore rotates at 1,593.6rpm (12 X 132.8).
Wanting to use an existing Gecko320 which cannot exceed 80VDC, I
will apply 75VDC to the motor. In theory, this would bring the motor
rpm down to 1,250rpm and gearhead shaft output at 104.16rpm (1250
divided by 12).
With direct drive, travel per 1 rotation of output shaft is 3.92857
inches. Hence, 1 inch of travel will equal .254545 of 1 rotation.
Multiplying this by 12 (gearhead reduction) yields 3.05454rpi
(Revolutions of motor Per Inch of travel).
If using a 500cpr (Counts Per Revolution) quadrature encoder, this
translates to 2000ppr (Pulses Per Revolution). Multiplying this by
the motor shaft rpi (Revolutions Per Inch) gives 6,109.08 pulses per
inch of travel (2000ppr X 3.05454rpi).
Changing the 1,250rpm of motor to revolutions per second yields
20.8333rps (Revolutions Per Second). With 2000ppr encoder, total
pulses per second equals 41666.67 (2000 X 20.8333).
Mach3's max ppr is 45,000 so as figured this configuration should
work with motor tuning setup at maximum velocity given ample power
of motor.
Inches Per Minute of travel (ipm) would be 409.2269 (1250rpm divided
by 3.05454rpi)
Assuming the motor has the power or the machine mass is within means,
this all should work
Originally the $30 per motor/reducer ebay buy was intended for only the gearheads, but
the motors came with them and are in pristine unused shape.
Bloy  |