Machsupport Forum

Third party software and hardware support forums. => Mach3 and G-Rex => Topic started by: kostner on December 03, 2007, 10:42:02 AM

Title: VERY BIG PROBLEM with G00 by Mach3 with Grex100
Post by: kostner on December 03, 2007, 10:42:02 AM

Hallo All

I have a big problem with G00 Command by Mach3 with Grex100. For example i gave G00 X1, The Maschine make 0,89 and on the DRO i can see 0,89 - but i wanted to have 1 mm !! Nevermind what Speed. This is always when i want do drive less than 5 mm. If i gave G00 X5 then maschine go to 5mm. With G01 i have no problems. If i gave G01 X1 then maschine go to 1mm and on the DRO i can see 0,9995. Next wehen i gave G01 X2 then the maschine go to 2 mm and on the DRO i can see 1,9995 - so its ok -but i don't undersand why can't Mach show exact 1 or 2 mm it muss be the same problem as with G00.
Sorry for my english

Best Regards
Daniel

Title: Re: VERY BIG PROBLEM with G00 by Mach3 with Grex100
Post by: Greolt on December 03, 2007, 03:15:02 PM

That is because you do not have a nice round number in steps per unit.

For instance I have 400 steps per mm on the Z axis but have 106.158964 steps per mm on X and Y

Mach calculates the position to ten decimal places even though it may only show three or four on the DRO

Greg

Title: Re: VERY BIG PROBLEM with G00 by Mach3 with Grex100
Post by: kostner on December 03, 2007, 03:17:35 PM

I'm using Servo's and i have 2000 steps / Unit on all Axis.

Title: Re: VERY BIG PROBLEM with G00 by Mach3 with Grex100
Post by: Greolt on December 03, 2007, 03:34:16 PM

OK disregard my previous post  ;D ;D ;D

Greg

Title: Re: VERY BIG PROBLEM with G00 by Mach3 with Grex100
Post by: Chaoticone on December 03, 2007, 09:29:18 PM

Have you checked the actual posotioning with a dial indicator? I think it will be correct, but the dro updates are a little slow I think.

Brett

Title: Re: VERY BIG PROBLEM with G00 by Mach3 with Grex100
Post by: alfredo6673 on December 04, 2007, 01:15:53 PM

Hello, although the measure never uses servos usually accurate at all, only in machines with ball screw and ball skids, and with little load, uses a higher gain in the servos

Title: Re: VERY BIG PROBLEM with G00 by Mach3 with Grex100
Post by: JiiPee on March 11, 2013, 04:48:44 AM

Hello

I have same problem with DSPMC and omron servos. How this is solved?