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### Author Topic: Forth axis  (Read 4423 times)

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#### northray

• 41
##### Forth axis
« on: October 07, 2008, 04:19:09 AM »
Hi all I am not sure if this is the place for this question but here goes.

I have just added a forth axis to my set up and all is working fine through Mach3

I want to mill in the round and cannot find any tutorial to show me how it is done.

Ray

#### Bodini

• 216
##### Re: Forth axis
« Reply #1 on: October 07, 2008, 05:32:14 PM »
It's just like X, Y, or Z, but it's A (assuming you set it to A, anyway).  You can set Mach to degrees or distance for A, so if you go "g0 X1 a360", it'll do 1 rev over that 1 unit travelled on X.

Sorry for the short & rudimentary post.  Give an example of what you'd like to do.

#### northray

• 41
##### Re: Forth axis
« Reply #2 on: October 07, 2008, 06:36:33 PM »
What I would like to do is carve some 3D models I have but instead of carving in the flat plane
I would like to mount the timber blank onto the forth axis and mill the complete 3D model in one go.

I see what you mean buy using the method you say and I will give that a try.

I guess what you mean is to take one of the sides of the design and in fact wrap this around the diameter of the work
the circumference being equal to length of side.

Thanks
Ray

#### ger21

• 6,292
##### Re: Forth axis
« Reply #3 on: October 07, 2008, 08:42:03 PM »
MeshCAM can do 4th axis inexpensively. www.meshcam.com
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

#### northray

• 41
##### Re: Forth axis
« Reply #4 on: October 08, 2008, 07:07:34 AM »
Thanks Jerry, I will have a look at that.
Rayc

#### Bodini

• 216
##### Re: Forth axis
« Reply #5 on: October 08, 2008, 09:01:57 AM »

#### Bodini

• 216
##### Re: Forth axis
« Reply #6 on: October 08, 2008, 09:08:19 AM »
MeshCAM can do 4th axis inexpensively. www.meshcam.com
If I remember right, meshcam doesnt really do 4th axis.  It does multi-sided code.... X Y Z on a portion, then rotates A, then does XYZ again.  Correct me if I'm wrong, its been 6 months or so since I looked at it.... Also, dont get me wrong, Meshcam is one of the best values in hobbyist toolpathing.

#### ger21

• 6,292
##### Re: Forth axis
« Reply #7 on: October 08, 2008, 11:16:10 AM »
It's indexed 4th axis, but it's still 4 axis, and a lot cheaper than any other methods that I know of.
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

#### panaceabeachbum

• 338
##### Re: Forth axis
« Reply #8 on: October 08, 2008, 09:37:02 PM »
here is a pretty good tutorial

http://deskcnc.com/Rotary_Tutorial.html

#### northray

• 41
##### Re: Forth axis
« Reply #9 on: October 09, 2008, 04:01:28 AM »
Thanks for the replies a lot to get my head around but the end results should be worth the effort
Ray