Setting up W 4th axis

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02 Nov 2011 12:07 #14510 by Todd Zuercher
I know I saw something about this once before, but darnd if I can find it now..

I have a router that I am considering converting to EMC2. It is a 4 axis machine with xyz and a true w (2 spindles each on its own axis with fixed spacing between them).

I know that I need to do some configuring of a, b, c, u, and v for w to work, but what exactly has to be specified, and what can be left out?

thanks

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02 Nov 2011 13:50 #14516 by andypugh
Replied by andypugh on topic Re:Setting up W 4th axis
Todd Zuercher wrote:

It is a 4 axis machine with xyz and a true w (2 spindles each on its own axis with fixed spacing between them).


I might be tempted to treat that as a toolchange, with a fixed Y-axis offset on T2. As long as you program a retract-on-toolchange then HAL can swap the Z command signal between the actuators without an F-error (I think).
This is only any good if you don't intend using both spindles at the same time, of course.

To have it individually programmable as a W axis, you need placeholder sections for [AXIS_3] to [AXIS_7] (which I believe can be completely empty) and then the W data in [AXIS_8].

You also need [TRAJ] AXES=9 (even though it isn't true) and [TRAJ] COORDINATES = XYZW

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02 Nov 2011 20:01 #14526 by Todd Zuercher
What I need to find is an example of the placeholders needed.

Is this only in the ini file, or is there things in the hal file as well.

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02 Nov 2011 20:07 #14528 by BigJohnT
Replied by BigJohnT on topic Re:Setting up W 4th axis
In the ini file iirc just have

[AXIS_0]
through
[AXIS_8]

and only put things in the sections that you have an axis for like 0, 1, 2, and 8

John

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27 Nov 2011 04:55 #15110 by Todd Zuercher
Thanks, so I only needed the headings.

I thought there would need to be something more, and that was where I was going wrong.

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