Full credit to "LowryIndustries".
To prevent file duplication, and confusion please navigate here to download: http://www.machsupport.com/forum/index.php/topic,18586.0.html"It's been a long while since I installed it but it works like a champ. It's a heavily modified Post file for Mach3 and Mastercam where the mill I am running is an older Bridgeport Boss 6. The post is just about as perfect as you can ask for and I have been using it weekly if not daily for a couple years now without a problem at all.
It should work for all versions of Mastercam V9 and greater. I am using Mastercam X5.
And the best thing about this Post Processor is it's entirely generic. It will work on any standard mill. It supports tool changes, tool heights, tool wear, flood cooling, etc.
Just download the attached file to (on an XP system):
C:\Documents and Settings\All Users\Documents\shared mcamx5\MILL\Posts "