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Author Topic: I Just want to draw a circle, help  (Read 2815 times)

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I Just want to draw a circle, help
« on: May 21, 2011, 02:19:50 PM »

Hi all, built a wood router in my shop and I am at the point to just draw a circle with a pencil. When I load the road runner it draws the first 500 lines fine, but
when I load the following code i get "Radius to end of arc differs from radius start line 12". I am just wanting to practice with CamBam and Mach3 untill my FUN budget
allows for the full license. Any direction would be awsome

Aaron

( Made using CamBam - http://www.cambam.co.uk )
( Untitled 5/21/2011 11:13:40 AM )
( T0 : 0.01 )
G20 G90 G64 G40
G0 Z0.125
( T0 : 0.01 )
T0 M6
( Profile1 )
G17
M3 S1000
G0 X1.0128 Y0.0
G1 F10.0 Z-0.015
G3 F30.0 X-0.5064 Y0.8771 I-1.0128 J0.0
G3 Y-0.8771 I0.5064 J-0.8771
G3 X1.0128 Y0.0 I0.5064 J0.8771
G0 Z0.125
M5
M30

Offline Hood

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Re: I Just want to draw a circle, help
« Reply #1 on: May 21, 2011, 02:26:17 PM »
Try changing the IJ mode to incremental  on the General Config page or better still have your CAM add G91.1 to the start of the code..
Hood
Re: I Just want to draw a circle, help
« Reply #2 on: May 21, 2011, 02:49:54 PM »
Hood, thank you so much, it worked! Another question if I may e so bold. How go I get CamBam to set the IJ Mode to Incremental I searched around and nothing jumped out at me.

Thanks again for the quick responce, now I have a day of garage time ahead of me

Offline Hood

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Re: I Just want to draw a circle, help
« Reply #3 on: May 21, 2011, 02:52:30 PM »
Afraid I dont have any experience with CAMBAM but it is likely you will need to edit the post processor. Maybe the guys at CAMBAM can do it for you as it will be easy for them :)
Hood

Offline ger21

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Re: I Just want to draw a circle, help
« Reply #4 on: May 21, 2011, 03:01:51 PM »
AS Hood said before, you need to get the post to add G91.1.
I'd recommend adding it after the G20 G90 G64 G40 line, like this, as it shouldn't be on the same line as G90 (one will be ignored.)

G20 G90 G64 G40
G91.1
G0 Z0.125
( T0 : 0.01 )
T0 M6
( Profile1 )

I've never used CamBam either, though, so can't tell you how it's done.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: I Just want to draw a circle, help
« Reply #5 on: May 21, 2011, 04:10:20 PM »
Thanks guys, that worked! Another question
Now I want to write my wifes name but I am stalling the X axis between letters. Moves fine when jog, home etc
any ideas?

Offline Hood

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Re: I Just want to draw a circle, help
« Reply #6 on: May 21, 2011, 04:13:55 PM »
Sounds like velocity may be too high in Motor tuning, jogging may be fine as you may have a slow jog % set (flyout screen by pressing the Tab key) and Homing fine because homing uses a % of rapid so is not at full velocity.
Hood