Starturn 4 Mach3 Motor settings help needed

andyevans · Post by **andyevans** » Thu 30 May , 2013 9:16 am

Hello

Can anyone help me out? I am getting my 1985 era Starturn4 working with Mach3 using the original drivers and motors as per David Murrays excellent posts. Can anyone who has got a similar setup let me know the steps per unit settings in Mach3 for the X and Z axes plus the max motor speeds you have been able to get?

After I have it all working I will do a post with as much detail as I can about the conversion.

Andy

angel-tech · Post by **angel-tech** » Thu 30 May , 2013 9:38 am

there are two types of drive boards in the orac, cd20 or sd2. The cd20 will give you up to 3m/min, the sd2 will be around 1.5m.min.
Set the x axis to diameter mode and if I remember correctly set the steps per to 200, velocity to 1500 or 3000 (cd20), acceleration to 150 or 300(cd20)
z axis should be the same.
Check the movement distance on the z axis, and on the x it will move half the commanded distance. If the x moves the distance commanded double the steps per.

andyevans · Post by **andyevans** » Thu 30 May , 2013 9:54 am

Thanks very much - I have the SD2 drivers, I believe these can be figured to run in half step mode too, not sure if that would be an advantage in this case. I will give it a go later

angel-tech · Post by **angel-tech** » Thu 30 May , 2013 10:22 am

they're already in half step mode

andyevans · Post by **andyevans** » Thu 30 May , 2013 11:33 am

Wouldn't half step be 400 steps per?

angel-tech · Post by **angel-tech** » Thu 30 May , 2013 16:09 pm

if you work out the pitch of the screw and the reduction on the pulleys you get 200 steps per.

andyevans · Post by **andyevans** » Thu 30 May , 2013 16:27 pm

Thanks very much - i will try it tonight and report back

andyevans · Post by **andyevans** » Fri 31 May , 2013 0:23 am

Thanks - that all works. Steppers aren't that smooth at very low feed rates but I guess that is to be expected.

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