RE: [CAD_CAM_EDM_DRO] calibrating cnc systems

Scott:

It's all mathematics, but nothing too difficult.

Stepper motors are rated by the number of steps per revolution. A typical
value is 200 steps per revolution, with 400 SPR for half stepping.

Next, the leadscrew has a pitch, either metric or English units. If you're
working with a Sherline tool, the English leadscrew is 20 TPI.
Multiplication of 200 by 20 gives a resolution of 4000 steps per inch. Now,
if you wish to move 1/4 inch, you simply multiply 4000 by 1/4 to get a total
of 1000 steps which you should move the motor. Now, this doesn't include any
backlash in the system. You'll add the number of steps corresponding to the
backlash to the number of steps to move if the motor changes direction.

If you're dealing with a half stepping motor, the motion would be 8000 steps
per inch instead of 4000.

I hope this helps.

-- Jerry Jankura
Strongsville, Ohio
So many toys, so little time....

| -----Original Message-----
| From: S.L.Ramsay [mailto:slramsay@...]
| Sent: Tuesday, October 30, 2001 11:47 AM
| To: CAD_CAM_EDM_DRO
| Subject: [CAD_CAM_EDM_DRO] calibrating cnc systems
|
|
| how in the world do you calibrate software so that it knows to
| turn a stepper motor or servo "X" amount of times to move an
| exact distance?
|
| Scott
|
|
| [Non-text portions of this message have been removed]
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