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Axis substutution issues.


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Hey All,

I am having some issues here with axis substitution.
What I see, is NOT what I get...
I'm sure it's my error somehow, but I'd like to learn how to resolve it, as a LOT of my work is exactly this type of work.
Machining patterns around a cylinder...
(in this particular instance, a conical shape, not a true cylinder)
Work/Tool/Construction planes are all Top.
When I simulate the cut, all is well, the part looks just like I want it to.
However, when I actually cut it, it's reversed...

Any Ideas where I am going wrong here?
I'm sure it's simple PEBKAC

I've been successfully making parts for years, but it quite often involves making a scrap part, adjusting the drawing so that reality ends up where I want it, and accepting that simulation does not look like reality.
I'd like to resolve that.
I'm sick of scrap...


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image.thumb.jpeg.91ad32f80020e10d662fe275ac41de69.jpeg

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I'm definitely interested in this,.. as not too long ago I programmed a 4th axis part that did a bit of simultaneous work (usually it's just 3+1 workflow on our 4th axis) and I had the exact same issue. my rotational axis would spin the wrong way. this was on a haas vf-2 with hrt210 (IIRC) It was just on one toolpath so we ended up just going in and fixing it by hand but it's been on the back of my mind ever since. Anyways best of luck and I'll be looking forward to figuring it out as well.

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2 minutes ago, Greg Williams said:

Good chance it is a post problem, simultaneous and axis subs are handled differently in the stock posts

 

OK, I have no problem believing that.
Where should I look for that?
I see axissub_dir and rot_ccw_pos in the post settings, both are 0
But there is nothing telling me what the options are for axissub_dir

Also, other details on the parts are placed in the correct location.
Details  indexed to angles are correct.
Other details, slots, etc... that are also cut with axis sub are in the correct location...

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I looked at the files quickly and found something that could be causing the issue.

See this video.

https://www.dropbox.com/scl/fi/bhwm3gcdgsisih2cl1870/Machine-Definition_JF.mp4?rlkey=b74e7bzatki7p1u3gjy7s9qdn&dl=0

One other thing to watch on Haas machines is there is a setting to "mirror" the axis, not sure why you would want to mirror an axis (just program it correctly).

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  • 11 months later...

I remember running an old Haas back in the day, when the counterbalance was a big block of lead and a cable/pulley arrangement.

The cable failed about 10 seconds after a tool change.

The head fell and the head, spindle, holder and tool crashed into the part.

The spindle,  part, holder and tool were a total write off. The machine was never the same.

Fortunately, it was an old machine, long overdue for replacement.

If you have any machines like this, make checking the cable and pulley and bearings a 

regular part of your machine inspection regime. 

 

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