-----Original Message-----
From: John Kasunich [mailto:[EMAIL PROTECTED]
Sent: Thursday, October 16, 2008 5:34 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Calibration of Sherline Mill under CNC
John Domville wrote:
> I need to find someone with the same 5000 series mill running the same
> Sherline controller and see what his settings are.
No. You need to study your machine and do some basic arithmetic.
How many full steps per rev? For 95% of the motors used on CNC
machines, that is 200. I'm almost sure that is the case for Sherline. Yes
it is
How many micro-steps per full-step? That depends on the drives. I
don't have a Sherline drive, so I don't know, but I bet it is either 2,
4, 8, or 10. My first guess would be 8.
How many revolutions of the motor per revolution of the screw? I
believe Sherline directly connects the motor to the screw, so that would
be 1. Yes, it is directly connected If there is a timing belt drive or
something, count the teeth.
How many turns of the screw per inch? If you can't measure one inch and
count threads, how do you expect to do machinist work? The X, Y and Z feed
screws are all 20 threads per inch
When you have the answers to the above questions, it only takes basic
arithmetic to figure out the scale, and the documentation explains the
math. Stepconf will even do the math for you.
For example, suppose you have:
200 full steps per rev Yes
8 microsteps per full step
1 motor rev per screw rev Yes
20 turns of the screw per inch Yes
to move the table 1 inch, you need:
20 turns of the screw, which is
20 turns of the motor, which is
20 * 200 = 4000 full steps, which is
4000 * 8 = 32000 microsteps
so the scale is 32000 And where do I plug this number in or at least check
it? Somewhere in the config.ini file that the wizard sets up / writes?
> The motors I have are 1/8 degree.
Not likely. I bet it is 1.8 degrees, Again you are right, I checked and it
is 1.8 on the motor not 1/8 degrees. One point eight degrees is 200 steps
per revolution Which is what the software (config) set the steps to.
and pretty much the most common step motor made.
Regards,
John Kasunich
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