Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: itolond on July 04, 2018, 12:35:36 AM

Title: centre part on table (probably a silly question)
Post by: itolond on July 04, 2018, 12:35:36 AM

Hi Forum,

i have headed back to the workshop and it appears i have forgotten a lot... :-(

I loaded G-code (all good)
set my XYZ DRO to zero on centre of part etc.. (seems ok)
set machine coordinates to 0.000 (to DRO)
but.......

my part is still showing at the edge of the table which appears to be causing all sorts of odd moves.....- see attached

Q... How to i set do my part is centered on the table?

Title: Re: centre part on table (probably a silly question)
Post by: rcaffin on July 04, 2018, 06:30:39 AM

I am not sure what those white dashed lines mean. However, The crossed purple lines show you where the origin is: righ in the middle of the part.

Lift the spindle up a bit, well clear of the part, Zero it up there, stick a bit of 1/8" PVC welding rod in the chuck, drop the feed down slow (slider), and push the Go button. This is called 'cutting air', and we all do it!

Before you do, click on ToolPath (tab 3) and see what the movement limits are. Make sure they won't cause grief.

Cheers
Roger

Title: Re: centre part on table (probably a silly question)
Post by: ger21 on July 04, 2018, 10:29:20 AM

Zero the machine coordinates first (home the machine)
Then set XY zero in the center of your part.

Title: Re: centre part on table (probably a silly question)
Post by: garyhlucas on July 04, 2018, 11:43:05 AM

You don’t need to home the machine unless you are using a tool changer or soft limits in most cases. I have limit switches that prevent a hard crash but they don’t require homing.

Title: Re: centre part on table (probably a silly question)
Post by: joeaverage on July 04, 2018, 02:36:15 PM

Hi,
because OP was not homing the machine is why the toolpath display was so far displaced from the center.

Craig