Machsupport Forum

Mach Discussion => Mach4 General Discussion => Topic started by: mfrisina on January 13, 2020, 12:03:43 PM

Title: Mach4 Homing doesn't set DRO's to zero
Post by: mfrisina on January 13, 2020, 12:03:43 PM

Can someone tell me why, when I Ref All Home, and the machine homes to the switches, Mach4 doesn't zero the DRO's?

Title: Re: Mach4 Homing doesn't set DRO's to zero
Post by: joeaverage on January 13, 2020, 12:52:29 PM

Hi,
most likely you have non-zero home offsets in your Homing table or you have non-zero residual G92 offsets.
To check the later look on the Machine Diagnostics tab.

Craig

Title: Re: Mach4 Homing doesn't set DRO's to zero
Post by: mfrisina on January 16, 2020, 02:31:46 PM

I have neither; however, it seems to reset to zero now. Having all sorts of issues with offsets. left an email with support.

Title: Re: Mach4 Homing doesn't set DRO's to zero
Post by: chuck.dunlap on January 16, 2020, 03:48:01 PM

I don't mean to hijack, but where is this Machine Diagnostics tab located? I dont see it in Mach4 Lathe.

Title: Re: Mach4 Homing doesn't set DRO's to zero
Post by: joeaverage on January 16, 2020, 05:28:24 PM

Hi,
I don't think there is a Machine Diagnostics tab in Mach4 Lathe.

I have had 'difficulties', if that is a fair description, where when I zero the Z axis as I have to do several times throughout
a circuit board job and the G92 offset has mysteriously grown from zero to 0.16mm or -0.045mm or some other random number.
When making a circuit board I need to control cutting depth to 0.005mm or better and so having what appears to be a random
G92 offset confuses the issue. Its no problem to reset the G92 but I am still bemused as to why it happens. I am making circuit
boards 'flat stick' for work and so have not really taken the time to work out why this happens.

As is often the case with Mach4 its not a fault or bug but a process or feature that I do not fully understand. Once the process is explained
then its no longer a problem. I'm hoping this is an example of the same thing.

Craig

Title: Re: Mach4 Homing doesn't set DRO's to zero
Post by: Stuart on January 17, 2020, 07:54:57 AM

Just maybe this may help with g92


https://smithy.com/cnc-reference-info/coordinate-system/g92-offsets/page/4

Stuart