Reverse post

Camdude® · February 25, 2005

Has anyone tried to reverse post in V9.1 Mr0105

or any V9 release for that matter. i have som g-code i need to reverse post with but i keep getting post errors when trying to run it. i need to retrace toolpath for engraving purposes. basically need to see where previous program starts and end engrave so i can add to it with out

overwriting previous engraving.

Don S at Barefoot CNC South · February 25, 2005

I have tried with Version 9 and had the same results errors from the post.

perfecseal mankato · February 25, 2005

Was the original program written thru mastercam?

If not you may have to do a little editing to the code before you can get the reverse post to work.

I ran into the same problem on some really old work, figured out where the errors in the old code were.Then all I had to to was a few simple edits and it worked fine.

JayMan · February 25, 2005

I didn't think mastercam offered that option. If so where is it??

Camdude® · February 25, 2005

the code wasn't writte in mastercam but there are no glaring errors or strange commands its all vanilla G & M codes. but when i try to run the reverse post i get all kinds of variable not found or expecting some seperator comment

.

Tom Szelag · February 25, 2005

I had no idea this option existed. What is it, you take some NC file and turn it back into a toolpath?

Glenn Stephens. from CCCS · February 25, 2005

camdude: You can usually just ignore all the errors. The reverse post can only read the G0 G1 G2/3 lines. Nothing else. Also, no rotary motion is supported, so if you've got A/B's it'll be an issue. I like to split the .nc file into seperate files with 1 tool per file to make it cleaner as well as being able to backplot the .nci files onto different levels.

Are you using the rp(l)fan from v9.1? I haven't has any real prblems with it. If you can't get a good .NCI, post the .nc on the FTP and I'll take a look at it.

For others: you can run (reverse) a gcode file through rpfan.pst to get an .NCI file. you can then backplot the .NCI and save as geometry to get the toolpath as lines and arcs. If the gcode file has a G41/42 in it, you won't know whether the toolpath is to the part line with full radius comp, or to tool centerline with wear comp, so be careful.

DC Gorn · February 26, 2005

HEY PHIL!

Looks like you got a real job. I like to use a the Gcode editor and out put a DWG of the path then reassign tools in MC so I don't get any surprises.

Free download

http://www.i-logic.com/inplot.htm

Fred Mitchell

JayMan · March 4, 2005

OK, Slow down so that us stupid people can get this.. how do you run the nc file through the rpfan post????

Ying Jiang · March 4, 2005

http://www.emastercam.com/ubb/ultimatebb.p...t=012364#000000

JayMan · March 5, 2005

I'm even stupider than that.

benito · March 23, 2005

I have v9.1 mr0105

I don't have the option to reverse nc codes.

Does anyone know why isn't available on my version?

thanks

Benito

P_Scott · March 23, 2005

benito,

Welcome to the forum. It's a little more complicated than that. I believe there is also a need to include the menu option for "Reverse" in the Post Processor menu from NC Utilities. This can only be done by editing the "Mill9.TXT" file in the right place to include the reverse post option. Perform a search in this forum by clicking on the link to the left of the "faq" link above. Search for words like "reverse" and "post" or a phrase such as "reverse engineering" for starters. Good luck. HTH