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Author Topic: Complete circles from nowhere?  (Read 13251 times)

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Re: Complete circles from nowhere?
« Reply #10 on: August 06, 2007, 07:10:18 PM »
just to let you know that it is programed for 1/8 tool. if you want to add cutter comp you need to put the code and offsets in. There is no H,D,G ect

Offline gm276

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Re: Complete circles from nowhere?
« Reply #11 on: August 06, 2007, 07:46:44 PM »
I'm still confused.
I tried the file. 
Now I only see one corner where
this circle event happens.
I tried loading another computer (my laptop)
and I get the same thing.
thanks
Don B

Offline gm276

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Re: Complete circles from nowhere?
« Reply #12 on: August 06, 2007, 08:00:37 PM »
Line 272 has  no value for X which
makes X the same as existing and
a circle occurs. I edited line 272 to
include an X value different from the
existing value and the circle went away.
Don B
Re: Complete circles from nowhere?
« Reply #13 on: August 06, 2007, 08:03:56 PM »
There is something funny about this geomitry. I did not zoom in close enought the first time.I think htere is an issue here let's look a little closer before you run or do an air pass first
Re: Complete circles from nowhere?
« Reply #14 on: August 06, 2007, 08:15:01 PM »
What I found that the top side of that V has 66 line just to go acrossed.  I reworked that side here some code and a dxf  your file just went from 395 enities to 328 entities from just changing that one area
« Last Edit: August 06, 2007, 08:17:13 PM by Lakeside design »

Offline gm276

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Re: Complete circles from nowhere?
« Reply #15 on: August 06, 2007, 08:54:20 PM »
I have to agree the DXF file may overly complex.
I am noticing the same thing from some code
generated from Bobcad.   It generates G2 moves
with out any X or Y value which seems to generate
a circle in Mach3.  Thanks for your help. I think I'll do
some reading on the G2 and see if I can learn a bit more.
Thanks
Don B

Offline gm276

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Re: Complete circles from nowhere?
« Reply #16 on: August 06, 2007, 08:59:49 PM »
I am guessing that due to the overly
detailed DXF, that the changes in xy
are too small sometimes to generate a different
x or y ( at least withing the preciision of the
current gcode.
Don B
Re: Complete circles from nowhere?
« Reply #17 on: August 06, 2007, 09:34:20 PM »
This is a bug in Lcam... I am working on fixing it at this time :( The problem is the start and end of an Arc section is less then .00001 diff. So when the file is posted the numbers are rounded to be the same as the start point and this will give you circle. So in your Gcode file just delete the circle and the file will run okay. I will be fixing that bug tomorrow night.
Thanks
Brian
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com

Offline gm276

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Re: Complete circles from nowhere?
« Reply #18 on: August 06, 2007, 10:02:16 PM »
Brian,
You made my night!
Thanks to all for the input.
Don B
Re: Complete circles from nowhere?
« Reply #19 on: August 07, 2007, 05:22:26 AM »
check the dxf to see that the lines join at the end poimt. Can you post a dxf of the cut out
Brain amd GM276 This was my first thought. In Bobcad we call the crop circles. But what happens is the software is making a position move from the end of one line to the start of the next.
Here is a post from the bobcad forum by the Bird BCC tech. man

Believe it or not, the crop circles that most people get are due to the geometry used to generate the toolpath.



What happens is when you have an arc and a line that intersect and the line is not perfectly tangent to the arc, the system generates an arc move around the corner. This arc can be so small that the beginning and end of the arc have a difference that is less than 0.00005, so when the coordinates are rounded you get the same position for both the end of the arc and the beginning of the arc (full circle).

I suggest trying to use the Make Arcs Tangential command, when possible. That alone should help reduce the appearance of the arcs.

Regards


« Last Edit: August 07, 2007, 06:00:12 AM by Lakeside design »