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### Author Topic: True 4 axis milling  (Read 59830 times)

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#### docltf

• 354
##### Re: True 4 axis milling
« Reply #10 on: July 19, 2010, 12:57:37 PM »
nice site Khalid.

bill

#### bwprice100

• 79
##### Re: True 4 axis milling
« Reply #11 on: July 19, 2010, 01:07:40 PM »
just type out a line of code.

g1 x-.655 y.165 z-.060 a15 f5.0

that is all 4 going at once,pretty simple.

Yes but not non linear. What would the code looke like to get the cutter, for example, to move in a simple arc at an angle that is not normal to any axis?

Brian

#### khalid

• 213
##### Re: True 4 axis milling
« Reply #12 on: July 19, 2010, 01:35:52 PM »
He showed you simple 4th axis code... The complex true 4th axis code can be generated Via true 4th axis software only;)

#### bwprice100

• 79
##### Re: True 4 axis milling
« Reply #13 on: July 19, 2010, 01:45:39 PM »
He showed you simple 4th axis code... The complex true 4th axis code can be generated Via true 4th axis software only;)

Yes but my original question was for non linear code not linear code which i am aware of. Sorry if I am using the wrong terminology.

Brian

#### khalid

• 213
##### Re: True 4 axis milling
« Reply #14 on: July 19, 2010, 01:49:51 PM »
the codes are subsequent lines with discrete movement in X/Y and Z-axis so you will get non-linearity out of linear codes..
http://www.machsupport.com/forum/index.php?action=printpage;topic=14288.0
« Last Edit: July 19, 2010, 01:58:56 PM by khalid »

#### docltf

• 354
##### Re: True 4 axis milling
« Reply #15 on: July 19, 2010, 02:00:52 PM »
if you move X & Y at the same time you are moving in a plane not linear.

bill

#### bwprice100

• 79
##### Re: True 4 axis milling
« Reply #16 on: July 19, 2010, 03:04:25 PM »
if you move X & Y at the same time you are moving in a plane not linear.

bill

Hi Bill

My interpretation is that the axis are moving in such a way that they generate a straight line between 2 point (linear), that straight line may be at an angle to all three axis but it is still the machines attempt at moving in a straight line.

For example this code from previous post
g1 x-.655 y.165 z-.060 a15 f5.0

Is still generating a linear interpolation it is only the fact that the A axis is a rotary axis that you get a non linear path and that IMHO is not the code doing this but the mechanical attribute of the rotary table; the same way a lathe generates a cylinder from a single point cutting tool and a linear movement.

Where as the code below does seem to be generating a non linear path that is non reliant on the mechanical generation of the path. The only caveat is that it is not using the 4th axis and the axis of rotation must be in a normal relationship to either the X, Y, or Z axis.
==============
G0 G49 G40  G17 G80 G50 G90
M6 T0 (TOOL DIA. 10)
G21 (mm)
M03 S0
G64
G00 G43 H0  Z1
X14.5 Y-5.75
G00 Z-2
G01 G42 P5 X8.75 F30
G02 X3 Y0 R5.75
G03 X-3 Y0 R3 Z-1.5
G03 X3 Y0 R3 Z-1
G03 X-3 Y0 R3 Z-0.5
G03 X3 Y0 R3 Z0
G03 X-3 Y0 R3 Z0.5
G02 X-8.75 Y-5.75 R5.75
G01 G40 X-14.5
G00 Z1
M5 M9
M30
=============

Are my conclusions correct?

Brian

#### khalid

• 213
##### Re: True 4 axis milling
« Reply #17 on: July 19, 2010, 03:09:06 PM »
G03 and G02 are circular interpolation so they are not straight line:) these moves can only be taken into Plane.. so for a true 3D the interpolation is very difficult... and the softwares are very costly..

#### bwprice100

• 79
##### Re: True 4 axis milling
« Reply #18 on: July 19, 2010, 03:15:10 PM »
G03 and G02 are circular interpolation so they are not straight line:) these moves can only be taken into Plane.. so for a true 3D the interpolation is very difficult... and the softwares are very costly..

Cheers for the response.

As refinement to my original post what software can do this?

Brian

#### khalid

• 213
##### Re: True 4 axis milling
« Reply #19 on: July 19, 2010, 03:19:30 PM »
My answer is simple..I don't know..I am also after this type of software...
Just check EdgeCam, Mastercam, GibbsCam.. i think they have a true 4th axis capabilities...