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easy motor tuning
« on: May 11, 2012, 04:29:26 AM »
Hello Chaps-  Please tell me is this is an acceptable way to correct a stepper motor
 that is not measuring correctly

Select this page

Config->motor tuning
 Example setting Z axis on lathe machine in millimetres
after setting the zero position on the Axix dro to Zero and pressing enter
I give the instruction G0 Z-100

Then I measure the distance actually moved and find that it has moved 110 mm

My current setting in steps per is 250

I do the followimg sum   250 divide 110  multiply 100  = 227.27
enter 227.27  into the steps per-- window in motor tuning screen
regards
fred evans




think of the trees-- use both sides of the computer paper

Offline stirling

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Re: easy motor tuning
« Reply #1 on: May 11, 2012, 05:25:42 AM »
Hi Fred - re-inventing the wheel again?  ;D

You're on the right lines but there is a procedure built into Mach to do this all for you.

goto the "settings" screen and bottom left hit the "set steps per unit" button. If you're using a screenset that doesn't have this screen or button then just temporarily load the standard 1024.set via the "view" menu button - do the biz and then reload your original screenset. Voila!

Ian
Re: easy motor tuning
« Reply #2 on: May 11, 2012, 06:45:09 AM »
Thanks ian--
I will try it immediately

By the way they still havent invented anything better than the wheel----

regards

fred
think of the trees-- use both sides of the computer paper
Re: easy motor tuning
« Reply #3 on: May 11, 2012, 07:08:14 AM »
Got some of it --

Its asking how far I want to move the axis--

what does it mean by "how far"  ?

How far from where?

sorry

fred
think of the trees-- use both sides of the computer paper
Re: easy motor tuning
« Reply #4 on: May 11, 2012, 07:32:13 AM »
sorry Ian _ I am confused

I loaded the screen that is called 1024.set. (I see it should have been 1024.lset
is this a problem--)

Now this 1024.set has become my default screen when I start up.
I want to get back to the original lathe screen.
What is the filename for the original lathe screen and where should that file be
in the mach3 folder?

regards fred




think of the trees-- use both sides of the computer paper

Offline stirling

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Re: easy motor tuning
« Reply #5 on: May 11, 2012, 07:44:32 AM »
1024.set is the one with the calibration button on.

1024.lset is the standard lathe screen - all .set and .lset files are in c:\mach3

re: how far from where? - from where it is.

Ian

Offline RICH

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Re: easy motor tuning
« Reply #6 on: May 11, 2012, 09:47:41 AM »
Fred,
Position the axis so you can make a move as long as possible .....a move you can measure. Remove any backlash, you move one way and then a small distance the other way.

You will asked how far to move, lets say 10", the axis will move 10" based on the current steps per unit settings, it will then will ask you how far you
moved....you measure and find it to be 9.950" and that's what you input for the value. The steps per  will be recalculated and you will be asked if you want to change them, you reply ok, if you go to motor tuning you will find that the steps per have been changed. Save settings if you want to keep the revised settings.

You can use the mill screen for the tuning, but, make note of the values and use them in the turn screen.

Once you have the steps per correct then you want to try a a few intermediate steps and see how linear the axis is in movement.
With the steps per unit correct then you want to check for backlash.

RICH

Offline stirling

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Re: easy motor tuning
« Reply #7 on: May 11, 2012, 01:17:20 PM »
You can use the mill screen for the tuning, but, make note of the values and use them in the turn screen.

RICH - do you NEED to do this? i.e. note the values. The values are surely stored in the xml NOT the screen. We're only using the mill screen for the button. The xml will still be the lathe xml. Yes/no?

Ian

Offline Hood

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Re: easy motor tuning
« Reply #8 on: May 11, 2012, 01:22:00 PM »
The xml will still be the lathe xml. Yes/no?

Ian

Correct Ian, personally I prefer to calculate the steps per, but maybe I am unusual that way ;D
Hood

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Re: easy motor tuning
« Reply #9 on: May 11, 2012, 02:34:06 PM »
Correct Ian, personally I prefer to calculate the steps per, but maybe I am unusual that way ;D
Nope - me too - never actually used the calibration thing.

Ian