4th axis engraving ??

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4th axis engraving ??

Postby Vmax549 » Fri Jan 19, 2018 1:46 am

Does anyone here do 4th axis engraving ? Would you be interested in a function for UCCNC to convert teh 4th axis to run as Y and have teh feedrates and size based on part diameter.

You would draw teh part as XY perspective and then UCCNC can wrap the XY code as XA motions. Being it is actually XY gcode you will see it in teh toolpathing as a flat plane instead of a wrapped plain(a). But at least you get to see teh toolpath (;-)

It would basically be for engraving as if you get too far away from Z0 teh cutting may start to distort as teh diameter of A at teh tool tip changes with depth.

I did this with Mach3 and have it working with UCCNC.

Just a thought, (;-)TP
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Re: 4th axis engraving ??

Postby velvetpig » Fri Jan 19, 2018 2:40 am

Hi Vmax549,
I would be very interested as i do 4th axis work- YtoA.
At the moment i have to change over to Mach3 for 4th Axis work.
It would be nice to stay with UCCNC.
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Re: 4th axis engraving ??

Postby Vmax549 » Fri Jan 19, 2018 3:05 am

Let me did out the code and double check it and then I will post it.

(;-) TP
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Re: 4th axis engraving ??

Postby Greolt » Fri Jan 19, 2018 11:14 am

Interested to see what you come up with.
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Re: 4th axis engraving ??

Postby velvetpig » Fri Jan 19, 2018 11:18 am

That would be great.
I am a new user of UCCNC, I Appreciate the work you and others do to make the changeover interesting.
Testing Plugins and Macros ect
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Re: 4th axis engraving ??

Postby ger21 » Fri Jan 19, 2018 12:49 pm

CNC Drive has plans to implement the required 4th axis features, they just haven't gotten to it yet.
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Re: 4th axis engraving ??

Postby cncdrive » Fri Jan 19, 2018 12:51 pm

Yes, we do. What I think is missing is selectable constant surface speed over radius of the workpiece and if we want to make it really nice then 4-axis toolpath view.
And yes, we really did not get to it yet, we still working on other things at the moment.
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Re: 4th axis engraving ??

Postby Gary Campbell » Fri Jan 19, 2018 1:16 pm

One thing to think about. While constant speed at the surface is virtually necessary on a lathe while turning. My experience has shown me that it is counterintuitive to wood routing on a 4th axis rotary. Having the rotary feedrate increase as the bit plunges deeper just does not work.

There could be some very minor advantage of feedrate increase on a rotary Z level rouging pass, but running a 3D rotary finish path with the feature enabled appears (to a human) to be the worst option available. Watching a small diameter tapered ballnose slow at the surface and then increase as it plunges deeper appears to be and is wrong. On a lathe the feature provides a constant load on the tool, on a rotary axis it actually makes sure the chipload is never consistent

Careful what you wish for.
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Re: 4th axis engraving ??

Postby Vmax549 » Fri Jan 19, 2018 3:01 pm

(;-) My 4th axis wrapper is not a constant speed variant. It simply sets up teh 4th axis as Y and modifies teh Y settings to move at a rate that is defined by the 4th axis surface diameter.

You have to remember when programing that you have a defined SIZE in Y that you must draw in. Your X is teh length of teh cylinder and the Y is teh circumference of teh cylinder. Otherwise you will overlap teh surface will cutting.

One note you can use ARCS to move teh 4th axis. It can make some very nice details in teh cylinder.

I found teh code and it was setup as a PAGE in a screenset I need to convert it over to a Wizard form.

(;-) TP
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Re: 4th axis engraving ??

Postby Gary Campbell » Fri Jan 19, 2018 3:36 pm

In my rotary work, I did the opposite. Using a viable XY feedrate to determine an equivalent diameter based rotary feedrate.

Using the formula F{(115)*(XY feed)/(DIA)}A or {(360/pi) * (feed) / (DIA) returns a surface feed for the rotary. Note: My experience is based on using Vectric rotary wrapped machining, but the math is the same.

Here is an example showing how a diametrical feed increase would be devastating: https://youtu.be/9bLnP9R7bE0

During the flute cuts you can see that the feedrates are slowed by a slow (10ipm) Z feedrate during the sections that are closer to vertical
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