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### Author Topic: Problems understanding why my X and Y are coords dont = mill ?  (Read 5257 times)

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#### menglor

• 58
##### Problems understanding why my X and Y are coords dont = mill ?
« on: January 01, 2014, 12:08:14 PM »
Problems understanding why my X and Y are coords dont = mill ?

So this morning I decided I wanted to play a bit on the mill, I am still thttp://www.machsupport.com/forum/index.php/board,1.0.htmlrying to learn Cam, Cad and CnC so please forgive if this is an obvious duh moment!

So, I am in BobCam,  I make a box (120mm x 60mm) ,  I put a pocket in the box (100mm x 50mm) , I export to Gcode.

I open it up in Mach3 , I home the machine, then I Zero the work piece. and then I click start.

it seems to plunge into the work piece about 3mm (as it should), then it cuts the Y axis. iy goes from 0 to 48 (ish)
then it starts to travel to X 97  but I dont want it too,  I want it too move about 10mm over, then travel to 0 on the Y.

Kind of like you see in the picture.

But as I am typing this, it looks like its trying to up to 90 and start from right and come back?

So its starting to look more and more like I still havent figured out my zero'ing problems. which historically is always been my problems with all my posts.

#### menglor

• 58
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #1 on: January 01, 2014, 12:10:05 PM »
so as you can see in BobCad, the work is in the upper right quadrant.

when I run the verify of the work.  it starts on the left,  works it way over to the right.

But I am getting the feeling, in Mach3, it wants to start on the right and work its way right, but I dont want it doing that.

does anyone know how to make it work from left to right
« Last Edit: January 01, 2014, 12:12:16 PM by menglor »

#### Hood

• 25,846
• Carnoustie, Scotland
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #2 on: January 01, 2014, 04:28:32 PM »
attach you .bccd file and your xml and I will take a look.
Hood

#### menglor

• 58
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #3 on: January 02, 2014, 07:27:01 AM »
I really appreciate this!

p.s.  I am not 100% this is the right  bbcd, bur i am 99% sure

#### menglor

• 58
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #4 on: January 02, 2014, 07:28:46 AM »
its not letting me post my xML file, its telling me that its already posted. I will have to look through my posts and see if I can find it

#### menglor

• 58
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #5 on: January 02, 2014, 07:33:56 AM »
ok found it.

http://www.machsupport.com/forum/index.php/topic,25821.10.html

as I read that post though, really it seems like its the same problem, pretty much its a lack of understanding how it generates the Gcode, I seem to expect one thing from bobCad, but Mach does is differently.

I think Mach3 is doing what its told. so it has to be either Bobcad doing something weird, or its me.  but that wouldnt be a first.

#### Hood

• 25,846
• Carnoustie, Scotland
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #6 on: January 02, 2014, 07:35:17 AM »
You will need to either zip or rename your xml. The forum only accepts a file name once no matter whether it was you or another that attached it.
So easiest to just zip with a unique name such as menglor1

Hood

#### menglor

• 58
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #7 on: January 02, 2014, 08:14:00 AM »
Testing 1 2 3

Ok, I posted it as directed

thanks.

#### menglor

• 58
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #8 on: January 02, 2014, 08:22:03 AM »
I understand that Gcode is like a coordinate system, like  GPS.  So I am expecting your going to tell me there is nothing mach3 can do to change it, because its only doing what its told.

So I kind of expect I am going to have to change something I am doing in Bob (which is tottally fine) or I am going to have to go to bobcad website and ask the same quest.  I hope you can help, but I totally understand if its beyond your expertise, since there are like a million flavors of CAM out there.

Just from looking at this code:

N09 X60.153
N10 Y31.743
N11 X53.803
N12 Y66.503
N13 X47.453
N14 Y31.743
N15 X41.103
N16 Y66.503
N17 X34.753

Its sending the X to the far right, then coming back, and I suppose this is the part I don't understand. since when I watch the "verify" its actually doing the opposite (see  2:22)  http://www.youtube.com/watch?v=K-gSa9wvKOE

#### Hood

• 25,846
• Carnoustie, Scotland
##### Re: Problems understanding why my X and Y are coords dont = mill ?
« Reply #9 on: January 02, 2014, 08:22:57 AM »
Ok only have V26 Bobcad here at the workshop so will have to wait until I get home tonight to try it out.
Hood