forum.cncdrive.com

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.
Cheers

Interested to see what you come up with.

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
Cheers

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

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.

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.

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

X axis:
Steps per inch 8128
Velocity 300
Accel 50

Sorry, but there is no 4th axis on this machine. But there may be soon, customer is waffling. These settings would be
A axis:
Steps per degree 44.4444
Velocity 36000
Accel 3000

Not until "the proud new Owner" purchases the rotary fixture

just an understanding question, is this only needed if your CAM can not do full 4 Axis ? or if u want to put an existing engraving on a round stock ?

cheers
Alex