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Author Topic: Cant get motors to calibrate  (Read 1834 times)

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Cant get motors to calibrate
« on: February 18, 2012, 08:35:59 PM »
Motors turning, yay.  I went through the procedure to calibrate the motors and its not working.  I'm using the sherline driver setup with motors  800 steps per revolution (microstepping), equates to 16,000 steps/inch.  I setup the machine in inches but it seems its moving in metric, how can I tell what units the dro is showing?  When I auto set the axes, the steps per are huge sometimes 30,000 and when I restart mach3 I get a warning that the kernel speed is too low for the setting. 

Offline Fastest1

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Re: Cant get motors to calibrate
« Reply #1 on: February 18, 2012, 10:18:55 PM »
Shouldnt the steps be 200 per rev? Most steppers are. Stock screws on the Sherline? 1/4-20? I would have thought with 10x microstepping you would be in the 2000 range. How far does it move when you ask for 1". I am pretty sure on the General Config page, the very first dialog box "Lock DRO's to Set Up units" needs to be checked.
I want to die in my sleep like my grandfather, not like the passengers in the car! :-)

Offline Fastest1

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Re: Cant get motors to calibrate
« Reply #2 on: February 18, 2012, 10:24:09 PM »
I just went and looked up my settings for my Sherline lathe as it still has the stock screws. I was showing 8000 steps per for both axis. Stepper at 200 steps per X 4 turns per inch on the screw X 10X microstepping = 8000 steps per. I am running a G540 or a HCNC pro not the Sherline electronics. Shouldnt be any different.
I want to die in my sleep like my grandfather, not like the passengers in the car! :-)

Offline Hood

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Re: Cant get motors to calibrate
« Reply #3 on: February 19, 2012, 03:36:26 AM »
8000 would be correct according to the info you gave, if its still not quite right try using Sherline Mode as it seems some people with the G540 needs a wider pulse.
Hood

Offline RICH

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Re: Cant get motors to calibrate
« Reply #4 on: February 24, 2012, 08:25:49 PM »
200 steps/ rev of motor X 10 ( microsteps) x 20 screw rev / inch = 40000 steps per

- 200 steps / rev are the norm 1.8 deg steppers but there are others like .9 and even better
- assume you are microstepping at 10x
- with no gear reduction it takes 20 revolutions of the screw to move the axis 1 unit = 1 inch

Depending on the velocity you will define or desire, you may need  to use a higher Kernel speed. The kernel speed will be llimited by you computer.


RICH
« Last Edit: February 24, 2012, 08:38:16 PM by RICH »