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General Mach Discussion / G code goes crazy on small detailed drawing ONLY. help !!!

« on: August 24, 2011, 06:06:51 AM »

Hi all , I really need your help ! I've been using the Mach 3 program for many years with great success .  Up until now I  have not noticed any problem when entering my G code into the Mach3 program , all G codes over hundreds of drawings have been perfect . The only thing I have changed , or done different is entered a G code from a drawing that has very small detail .

Let me explain ....

Up until now every CAD drawing I have done ( again hundreds of them ) have had detail where as all the objects were a minimum of 3.2mm ( 1/8 ) or more apart from each other . Where as my new drawings require objects to be cut within 2 mm of each other . It was only at this time I realized that once I put the G code into the Mach 3 program , the G code went crazy in some places . So what I did was go right back to CAD , stretch the entire drawing abit , recreate a new DXF file + G code and then re-import the same drawing ( now stretched a bit ) back in to Mach 3 . By stretching to a point where all objects were 2.6 to 3 mm or greater apart from each other , then the G code would become totally stable again . I repeated this process a few times and it is very consistent , the closer the object get together the more crazy the G code becomes .

So in summery , when doing a drawings with a reasonable spacing between the object there is no problem . However as the drawing detail becomes smaller ( objects closer to each other ) the Mach 3 program does not  seem to be able to decipher it properly .

To me it doesn't seem like there is any problem with the CAD drawing , DXF file or G code . It really does seem to me as if the Mach 3 program doesn't have enough resolution to deal with very small detailed drawings . Again I don't have any problems with cutting on my CNC router table when the drawing objects are far enough away from each other .

Any ideas would be greatly appreciated at this frustrating point in time , many thanks in advance .

Regards Sterling