Eagle CAM Processor output - Mach3 Size issue

[deleteallusers]

I'm using Eagle to design a PCB board so I can output it to
HPGL and route the board with my DIY CNC Machine.

However, the scale/size is off really bad. My board is
suposed to be 3x3 inches when routed, however it's only
about 3/4 inch square.

I've adjusted the grid in Eagle a couple of different ways.
There is also a scale property in the CAM processor, but
I'm not sure that's the problem

Heck, it may be Mach3's that's causing the problem.
I know I'm working with inches and not mm because I used a G20
as the top line of G-Code.

Has anyone had this problem ?

What should I do ?

-Areal

[samco]

mach takes hpgl? (I don't use mach)

I use this script

http://groups.yahoo.com/group/pcb-gcode/

It outputs standard gcode.

sam

[deleteallusers]

Yes, I also can use that script, however it doesnot matter
it's very small output.

Everything I do is tiny.

I don't know why ?

Thanks,

[jcdillin]

can you cut something out with a different software package and it be the right size? Maybe the steps per rev is not set right in mach? I know I made that mistake on my machine at first. I had miscalculated it and everything I made was very tiny.

[deleteallusers]

Thats probly what it is, how do I do that ?
I have a program like this, but instead of it moving 11.9625 inches
it looks like it's only moving 3/4 inches.

G20
G90
G82 X0.0375 Y11.9625
G82 X0.0500 Y0.0500
G82 X11.9500 Y0.0500
G82 X11.9500 Y11.9500
(File Footer)
T01
G00 Z0.5000
M05
M02

[ger21]

Thats probly what it is, how do I do that ?
I have a program like this, but instead of it moving 11.9625 inches
it looks like it's only moving 3/4 inches.

G20
G90
G82 X0.0375 Y11.9625
G82 X0.0500 Y0.0500
G82 X11.9500 Y0.0500
G82 X11.9500 Y11.9500
(File Footer)
T01
G00 Z0.5000
M05
M02

Sounds like your machine is set up wrong. Incorrect steps per unit in the motor tuning screen. If you're not moving what the g-code says you should, you need to set up your machine so it does.

[jcdillin]

There are quite a few steps so it's tough to outline it here. If you check in the configuring Mach3 guide in section 5.5 they tell you step by step how to tune your motors for your machine.

[deleteallusers]

Ok, thanks, that may be what it is. I don't know what I'm doing
and I'm behind on my project.

I'll review the document again, I could not find a area that delt with this problem.

Thanks for the help.