Dragon relief

Good evening everyone

This is my first relief with my new machine.
Size about 200x300 deep 20mm.

Regards,
V.

Hello Andy

hope the pictures are better, as you can see need a bit of sanding job.
Any suggestion on some sand technique; I would like to finish sanding this dragon before getting to old.
the relief is about 200x230 deep 20mm on a piece of scrape wood, I think is a piece of cypress belonging to a beam.
It took me about 5 hours with a few problems in the middle due to the fact that the chosen post processor in artcam did not behave properly with my tool change macro, so a bit more study have to be done.
Basically in the end i had to modify my gcode splitting the work in two files and bypass the automatic toll change; lucky i had a piece of surface left after the roughing to Z zero the next toll for the finishing.

Regards,
V.

I forgot to say that the parameters I use are:

Feed rate 60mm/sec
plunge rate 30mm/sec
spindle 12000 rpm
fist roughing 4 flute 1/4inch diameter end mill step over 100%
finishing 1mm radio conical bull nose step over 40%
estimated time by artcam under 2h

My time about 5h with pause in the middle due to problems.

Regards,
V.

Hello Tommy

Thanks, i like it too, I am still learning on process and material in my spare time.
My ultimate goal is to carve my own violin but it s a long journey.
For the moment I have to play someone else instrument.

Regards,
V.

Looks nice.

But as to the disparity of the run time estimates. The biggest problem with most run time estimates is that they generally have no proper way of accounting for machine acceleration and it's affect of the actual cutting speed. Most estimators simply add a small fudge factor for each line of g-code. But if the distance traveled per line is small and or machine accelerations are low, this calculation will often be horribly wrong, as you found out.

Hello
Thanks.
You are absolutely right, the traveling distance were "small".
No matter how much you push speed up, the acceleration won't reach its top value if the distance is less than the bottom triangle side.
I can adjust the velocity slope to shorten the distance to some extent.
In any case it's good fun.

Bye for now
V.