Thread: CNC 4th Axis at work
Just found this video of a 4th axis in action, i liked the design he was cutting and also think its a good example of what you could do if you went for a 4th axis !
Is anyone looking to add a 4th axis or ?
Last edited by Lee Roberts; 30-01-2014 at 12:01 PM..Me
Is that a 4th axis or merely a rotary X or Y?
Here's one I did earlier :dance:
Ignore the dancing about, the X3 was on a transport stand ready to go to the 2006 Harrorgate show and the castors were not locked down.
This is another gear but instead of being done on a rotary table or 4th axis this one is just done in X, Y and Z fixed in a chuck bolted to the table.
The model came out of a CAD parts file off the web as an STL file, programmed in Vectric's Cut3D and cut with a 2mm ball nose cutter.
The video shows the final clean up pass in the opposite direction to remove some of the cutter marks.
It could have been a lot better if I had reduced to stepover but as I'd not done one before I didn't want to waste a lot of cutting time if it didn't work.
Never got round to doing a finer pass gear and some bastard nicked that one anyway [ probably Kip :whistling: ]
Spiral helicals are one of the hardest type of gear to cut and a one off can take well over a day to cut in a home shop.
Last edited by Lee Roberts; 30-01-2014 at 12:02 PM.John S -
Out of interest, is there a general thread for CNC videos?
Video Gallery but it hasnt been used that much. I add video's as i find them, your more then welcome..Me
On the subject of axis'sss whats the diference between 2.5d and 3d ?
2.5 D is where the Z axis drops to a predetermined depth and the shape is produced in X and Y whilst at this depth. X and Y can work together like doing a circle and it's called interpolation.
Typical example is doing a pocket down to 10mm deep in stages of 2mm at a time.
3D is where the Z axis is changing all the time as the X and Y are moving, imagine machining the aerofoil section on a plane wing.
Virtually all machines with a powered Z can do 2.5D and 3D, the difference is in the CAM software to generate the code.
2.5D is relatively cheap but full 3D starts to get very expensive.
.John S -
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