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Author Topic: newbee, steps per stay the same but .125 now = 3.3125  (Read 6217 times)

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Offline Hood

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Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #10 on: October 01, 2010, 01:25:50 PM »
The xml you attached is set as metric units by default, is that correct?
Hood

Offline Hood

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Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #11 on: October 01, 2010, 01:33:47 PM »
In other words, what I am asking is when you first start Mach and if you zero the X DRO and command a G0X1 from MDI does it move 1mm or 1 inch?
Hood
Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #12 on: October 01, 2010, 01:35:46 PM »
hood,
I do see menu. I'll go and try that.
And thanks for the help.
JR
Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #13 on: October 01, 2010, 01:36:44 PM »
It needs to be inches

Offline Hood

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Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #14 on: October 01, 2010, 01:40:25 PM »
Ok you are set as default units metric and what I suspect is happening is you have set up your steps per unit to move 1 inch when you command a 1 inch move when in fact 1 unit should only move 1mm.
What are your screws pitch and also is there any gearing between motor and screws?
Hood
Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #15 on: October 01, 2010, 02:41:17 PM »
Hood
will this tell you anything?
ACME 1/2-10 Single Start Anti-Backlash Nut   or
ACME 1/2-10 5 Start Anti-Backlash Nut   Don't know which one. How can I tell or does it mater?
JR
Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #16 on: October 01, 2010, 02:42:33 PM »
Motors are direct connect. Shaft to shaft.

Offline Hood

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Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #17 on: October 01, 2010, 02:51:45 PM »
Ok as you are already getting 1 inch movement when you command a 1 unit move then really all you need to do is go to config menu and then Default units. Change that to Inch and you should be fine.
The problem you have been getting is you have it set to metric but you have entered the amount of steps per unit to equal a 1 inch move. So when you command a move of 1unit you get 1 inch like you expect. Problem is Mach is thinking its only 1mm so you load the roadrunner and it seems fine but when you load your code it is 25.4 times bigger, the reason is your code has G20 in it telling Mach its inch and for a move of 1 it needs to move 25.4 times the normal unit. The reason the Roadrunner is fine is because there is no G20 in it :)

I suspect your screw is 5 start 1/2 -10 which would mean 2 turns of the motor would move 1 inch so 200 steps x 10 microsteps x 2 turns = 4000 steps per unit.
You have it close to that if I recall but really the number should be 4000 if the screws are accurate.
Hood

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Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #18 on: October 01, 2010, 02:56:43 PM »
Its actually named Select Native Units and not Default Units like I said.
Hood
Re: newbee, steps per stay the same but .125 now = 3.3125
« Reply #19 on: October 01, 2010, 03:03:55 PM »
X = 4059
Y = 4118
Z = 4050
I'll check that once I have set to inches.

I was sure that I set it to inches at the start.

What is the best way to set it? Somewhere I read that you have to setup everything if you change it.