Inaccurate feedrates in g-code vs. program

[CJH]

Hi everyone,

I have a bit of an issue that I am hoping someone may be able to shed some light on. I posted the same inquiry over on the Artcam forum as well.

I had my PC upgraded to a 64 bit with Windows 7 Pro op system on it. Previous system was 32 bit XP Pro. So here is the issue. I am trying to test 2 posts I have for a CR Onsrud Panel Pro CNC Router with the OSAI 10 control. All the program header values in both posts are correct to make the nachine move the way it should, and the spindle speed is correct. But the feedrates that are posted in the code are way off. My programmed feedrates are 105 mmpm for the G01 cut moves, and the plunge moves are programmed for 42 mmpm. The posted code feedrates are 60 times faster than the program feedrates for the plunge, and linear moves. I cant figure out what is going on. I have tried the same files in both Artcam Pro 2009 and AC Pro 2010. The results are the same. I suspect it may be a variable in the post that I am missing that needs changed. I even read the post processor manual, and can find nothing to help me.

When I got the post from our reseller some time ago, we were trying to sort out the issue, but had to abandon it cauase I was not getting satisfactory results. Since AC is our secondary CAM program it wasn't that big of a deal, and I was only using it with our CNC Mill.

But now there are a couple projects on the horizon that we will need to do on the router with AC. Thus the need to revisit this....Also the other wrinkle is we let our maint. on it lapse this year since I am using it so infrequently. I contacted CR Onrud to see if the may be able to help, and they were unable to since they do not have a post for the Panel Pro w/ OSAI control in Artcam. All of their posts are for AC Express with a differnet controller on their entry level machines. So they told me I may have to take this issue directly to Delcam, and bypass our reseller to get facilitated satisfactory results.

Before I go to Delcam I was wondering if anyone has ever had this issue, and how they fixed it. Any thoughts would be appreciated to help me figure this out, or to help me illustrate the issue better to Delcam tech support.

I have attached the program file and it is a simple rectangle. Here is the resulting g-code:

;Profile
G92X(@XAXG92)
G16XY
N4 G90
N5 G80
N6 G40
N7 G00 G79 Z(@ZPARKP1)
N8 G71
N9 (UAO,1)
;Profile
N11 M6 T9
N12 M3 S15000
N13 G00 X0.0000 Y0.0000
N14Z100.0000
N15G00 X136.2640 Y708.7975 Z50.0000
N16G01 Z10.0000 F2520.0
N17G02 X133.2640 Y711.7975 R3.000 F6300.0
N18G01 X133.2640 Y1077.5585
N19G02 X136.2640 Y1080.5585 R3.000
N20G01 X526.2280
N21G02 X529.2280 Y1077.5585 R3.000
N22G01 Y711.7975
N23G02 X526.2280 Y708.7975 R3.000
N24G01 X136.2640 Y708.7975
N25G01 Z0.0000 F2520.0
N26G02 X133.2640 Y711.7975 R3.000 F6300.0
N27G01 X133.2640 Y1077.5585
N28G02 X136.2640 Y1080.5585 R3.000
N29G01 X526.2280
N30G02 X529.2280 Y1077.5585 R3.000
N31G01 Y711.7975
N32G02 X526.2280 Y708.7975 R3.000
N33G01 X136.2640 Y708.7975
N34G00 Z50.0000
N35G00 X0.0000 Y0.0000 Z100.0000
N36 M5
N37 M30

Thanks,
Chris

[Eurisko]

Don't know if this helps, but .42 mm per revolution X 15000 rpm = 6300 mm per minute, as seen in the code...

[CJH]

Eurisko,

That doesn't help much since I don't see in the post config where there is a mm per revolution value.

Any other thoughts are welcomed though. I'm stumped.

Chris

[CJH]

Well I was able to solve the problem with a little help from some guys on the Artcam main forum. Here's a link to the result.

ArtCAM Forum • View topic - Having trouble with inaccurate feedrates in code vs. program

Hope this helps someone else if they need it.

Chris