Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: efimius on May 23, 2007, 09:55:01 AM

Title: need help! Newbie's problems
Post by: efimius on May 23, 2007, 09:55:01 AM

In this moment I am trying to setup my home brewed engraver.
The problem is the scale factor. When I get any G-Code from
CAD prog. the MACH3 engrave it with 1/10 scale factor.
I think I know why.It's because my Microstep Drive.
How I can to setup the X,Y,Z scaling=10 in the MACH soft?

Sorry, I have very poor English.

Title: Re: need help! Newbie's problems
Post by: Graham Waterworth on May 23, 2007, 12:53:56 PM

Hi,

you need to set the 'steps per' to 10 times what they are now.

Graham.

Title: Re: need help! Newbie's problems
Post by: efimius on May 23, 2007, 01:15:58 PM

 :)I did it.Now it work!!! But...
I have "standart" 200 step 1.8 deg. stepper.My Microstep Drive
multiply it to 2000 steps,and my screw drive moved 0.1 inch
per one revolution. So I expect to get the line = 1 inch,when
I send to MACH3 (in MDI) stroke command " G0 X1".
And I get 29mm. :(.
My MACH3 setup utilise inches units.
 Thank you very much.

Title: Re: need help! Newbie's problems
Post by: Hood on May 23, 2007, 01:32:49 PM

Are your drive definitely 10 microsteps? some drives are 8?
 You say you MDI G1X1 and it moves 29mm, is this in the DRO or just you measure it as 29mm? Do you use metric normally, if so why set your machine in inches?

Hood

Title: Re: need help! Newbie's problems
Post by: Hood on May 23, 2007, 01:35:31 PM

BTW there is a setup routine for Mach to work out your steps, you will find the button on the settings page, press it and follow the instructions. The button is just above the reset on the settings page.

Hood

Title: Re: need help! Newbie's problems
Post by: efimius on May 23, 2007, 01:42:52 PM

My Microstep Drive 103M series provide only 10 micSteps.
I am newbie in the CNC area and Ihave not DRO.
29 mm is measured with simple caliper.

Title: Re: need help! Newbie's problems
Post by: Hood on May 23, 2007, 01:48:35 PM

Hi, when I said DRO I was meaning the axis DRO in Mach :)
 Do you usually work in mm? if so it is best to set Mach up in mm rather than inches.
 Hood

Title: Re: need help! Newbie's problems
Post by: efimius on May 23, 2007, 01:59:31 PM

I built this engraver for PCB milling for my projects,then
I need inches.
Just now discovered strange thing :
After BTW procedure I got right value in Y direction - 25mm,
but in the X direction I got only 22mm...
All settings in the motor tuning is the same for both axis.

Thank you.

Title: Re: need help! Newbie's problems
Post by: Hood on May 23, 2007, 02:18:09 PM

That is strange, maybe try doing it again and see how it works the second time. Keep a note of the settings you have now and if it gets worse you can re enter them in the motor tuning.
Hood

Title: Re: need help! Newbie's problems
Post by: efimius on May 23, 2007, 03:16:15 PM

It make me crazy,I check it many time and I get
in X axis 22mm instead 25,while in the Y direction
I get the right value.
It's not step skipping (I have spare of the motor power)
and all settings is a same to the both axis.
The screw drives of X and Y axis is construct from
the same screw 0.1 inch... ???
I am beginning think that my screw decrease
one revolution = 2.5mm,but why!!!

Title: Re: need help! Newbie's problems
Post by: Hood on May 23, 2007, 04:29:58 PM

What is the steps per on the X axis?
Hood

Title: Re: need help! Newbie's problems
Post by: efimius on May 23, 2007, 04:34:03 PM

20000

Title: Re: need help! Newbie's problems
Post by: Hood on May 23, 2007, 04:39:05 PM

Try it at 22727 and see what happens.

Title: Re: need help! Newbie's problems
Post by: efimius on May 23, 2007, 04:50:03 PM

What is the mystic number?
200 steps X 10 micSteps = 0.1 Inch Then
1 Inch = 20000, it's wrong?

Thank you.

Title: Re: need help! Newbie's problems
Post by: Hood on May 23, 2007, 04:54:51 PM

you have 20,000 and it moves 22mm when you command it to move 25 so I just wondered what it would move if you put 22727.

Title: Re: need help! Newbie's problems
Post by: efimius on May 24, 2007, 07:10:30 AM

 :) :) :)
Hood,thank you very much.You guide me to the
right direction.
I caught out that my screw drive have 5/8" diameter,
then it's TPI = 11, and pitch is 2.308 mm.
I did the changes in Step per and now all works
properly!

Thanks!Best regards.
                               efimius.

Title: Re: need help! Newbie's problems
Post by: Hood on May 24, 2007, 01:01:25 PM

Glad you are sorted.
Hood