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No problems at all
I have made a modification to the driving mechanism which improves the movement smoothness , I will insert the photos of the upgrade.

https://youtu.be/pTT8YipUcTU

https://youtu.be/f_umNSKsKiU

https://www.youtube.com/watch?v=RPtZSgpY630

https://youtu.be/KPB621BpUM0

478280

No ball or lead screws.
No rack and pinion gear.
No belts.
No cable chains.
No linear guides.
No noise issues.
All of the stepper motors are located in the rear of the machine.
All of the...

If you ask about the CAM program to use the 4th axis in ordinary cases. also in Vcarve pro when you save the tool path choose the post processor as in the attached photo.

Note that:

If your rotary axis is parallel to Y axis you will modify the last method as follows:

Replace (G17) by (G19)
Replace (X) by (Z)
Replace (I) by (K)

I use my own new technique to operate the stepper motor of the 4th axis in one direction simultaneously with the other two axis (Z & X) or (Z & Y) instead of rotating the 4th axis motor left and...

Vase - 750 mm height made of 2.70 mm sheet metal and pine wood.

Video of the roughing engraving of the rear profile of the four Cabriole legs.

https://www.youtube.com/watch?v=fST_zjQdnwI&feature=youtu.be

Routing the four attached columns according to the outer profile of the Cabriole leg, and then rotate every column 180 degree and reattach them as one column again and engrave the new column...

My method in photos to produce four Cabriole legs at the same time by my machine.
Using 4 x identical square columns 60x60mm attached to each others as one square coloumn 120x120mm by a tape and two...

I am going to take a video of the overall machine while cutting by a professional Cam.

600.0 mm height - 58.0mm max dia. - 15.0 mm min dia - pine wood

https://www.youtube.com/watch?v=3d7gRC5L8bo

A candle holder made of ash wood and 2.70mm sheet metal.

Work piece 600 x 600 mm (23.6" x 23.6")

Wall clock of 600.0 mm dia. (23 1/2") made by a combination between 3.0 mm sheet metal cut by my diy cnc plasma and 16.0 mm plywood engraved by my diy cnc router.

Wall wood clock - clean DXF

Two wall clocks.
1st one is a combination of 3.0mm sheet metal cut by my diy plasma machine and a plywood engraved by my diy cnc router.
2nd is 100% made by my cnc router on 16.0mm plywood.

coffee table 48" x 23" - 3.0 mm sheet metal - 60.0 mm dia. tube
Using rotary axis to produce the tube profile.

http://www.cnczone.com/forums/cnc-wood-router-project-log/253724-wire-rope-driving-mechanism.html

ramp column made using the ability of rotating the 4th axis around its joint.

Two samples has been done today by the rotary axis.

Driving mechanism of the gantry is located in the rear side of the machine using only one stepper motor.

https://www.youtube.com/watch?v=UuMgBP3j6so&feature=youtu.be

1st trials.
spiral column - 3 door - 1.5" diameter - 17" length - 3" pitch
Square column - 4"x4"

Z axis movement, please note the vertical movement of the mechanism block to compensate the axial displacement of the wire along the threaded axis.
...

Front part of the table designed for dovetail.

Part of the table has been designed to fix the small work pieces up to (15" x 30") using sliding bars and also used for square columns.