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1

General Mach Discussion / parts are the wrong size

« on: February 11, 2013, 07:23:50 PM »

hi, i have been using mach for a while now on a cnc router that i built myself completely from scratch.

here is the situation. i have calibrated all the axis. everything moves accurately. ie if i move the x axis 1" or 30" it goes exactly that far +/- .005"

when i use any of the mach wizards, or g code from a cam program. the parts come out the wrong size.

if i run a hand written g code program they come out the right size.

here is an example of a simple g code program i wrote to cut the inside of a 1" square. i am using a .125" (1/8") cutter

Code: [Select]

g01
m03
z-.125
x-.9375
y.9375
x.9375
y-.9375
x-.9375
y0
z.1
and here is an example of the squares it cuts.



and here is an example of what happens with the mach 3 pocketing wizard.



as you can see they are not the right size. i am at a loss as to what could be causing this to happen.

i have also cut some parts with multiple passes for depth. ie. .100" doc. 5 times for .500" total. all of the steps line up exactly so i dont think i am loosing steps. and the manual code is also right on.


any ideas or help are greatly appreciated.

2

General Mach Discussion / HELP! no lpt output. (advanced)

« on: December 31, 2010, 08:08:27 PM »

im new here, and to mach. been doing my research for a while tho. really good with computers and electronics.

here is the problem.

i get no output from the parallel port (lpt). when i try to jog the axis (x,y,z,a). i have verified this with a multi meter directly at the port on the motherboard.



HERE IS WHAT I HAVE DONE.

i am running the latest version of mach. Mach3 R3.042.040

ran the mach3 driver test. (it works perfectly)

i uninstall ed and re installed the mach driver (per the manual, meaning i deleted all traces of the driver from my system)

i uninstall ed and re installed mach (with a new download)

i uninstall ed and re installed the parallel port driver (windows)

i tried installing a pci parallel port add on card.

i verified and tried different ports and pins for everything.

the parallel port addresses are correct.

i tried changing the different bios settings for the parallel port


im at a loss right now.  there is no output coming from the axis ports. i DO get a charge pump signal. it seems to work fine. but nothing else does.

if you have read the above and can think of anything else for me to try please let me know.