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Author Topic: Problems with Measurements when cutting with MACH 3  (Read 2165 times)

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Problems with Measurements when cutting with MACH 3
« on: October 23, 2011, 07:33:40 PM »
Hi Guys,

I use Autocad for my drawings and save them in DFX and convert them with Lazycam! Now I have been having toruble with measurements ... Normally one side is always off not sure why? For example I cutted a rectangle out of Acrylic which measured 2 Inches in Width x 10.75 in height! The 2 inches came out perfectly cut but the 10.75 inches measured like 10.85 and I have no idea why???? I seem to have this problem with certain drawings in Autocad but not all... Any ideas... Also another issue I have...

I make 1 piece which is a Left side for a project which has a hole on one side... I then use the mirror function in Autocad and mirror that same piece so I can have the hole as a right side for my project... Th thing is that when I convert the DXF file from Autocad mirrored and I convert it to Mach3 and then cut the part out the Hole piece is like 1/16th smaller ... Any ideas why??

Thanks for the help!

Roberto

Offline RICH

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Re: Problems with Measurements when cutting with MACH 3
« Reply #1 on: October 23, 2011, 08:24:42 PM »
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I seem to have this problem with certain drawings in Autocad but not all
Post the dxf file and also the gcode file from LC.

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Hole piece is like 1/16th smaller
Post the dxf file before mirroring it and also the dxf files for both sides.

How much backlash do you have on each axis?
I really don't think it's a Autocad or LC problem.

RICH
 

Offline BR549

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Re: Problems with Measurements when cutting with MACH 3
« Reply #2 on: October 23, 2011, 08:35:34 PM »
Double check your acad draw for errors. Check all Dims

Double check your Gcode output from Lcam , Do the math verify the cut sizes are correct in the Gcode

Finally IF those 2 check out it only leaves the machine. Check the couplings and check for lost steps on the axis.

Just a thought, (;-) TP
Re: Problems with Measurements when cutting with MACH 3
« Reply #3 on: October 24, 2011, 12:35:51 AM »
Will check my dimensions and will do the maths on the G-CODE thanks for that! And if not is my CNC machine is just weird cause there are certain files I cut first cut is great second on is like 1/32 smaller ?? But just certain files specially those I have mirrored? Will post codes tomorrow!

Regards,

Roberto