|Home » Forums » CNC » Message||Login|
You are not logged in. Consider these WOODWEB Member advantages:
How long should this take?11/11
Hi all, I don't do much carving on my cnc . But need to incorporate two of these panels into a project I am doing. In your experience how long should this take to carve? Its roughly 12''x15''
Thank you in advance
Doesn't your software tell you run time? No idea how many bits you are going to use, and what you are going to machine all that flat space with.
My guess would be 1 to 2 hours.
When we run detailed 3D work we reduce the acceleration by about 50%. Not sure if your software would do that automatically.
Also you might try a test run........at least partially through the program ...........in scrap or MDF.
There are to many variables to give a good answer to you. What size bit what step over how fast is your cnc
Isn't the sanding a major time consideration?
I realize the feed speeds and step over rates will be the large contributing factor here. I was hoping that with the feed back from others I could zero in and refine how I should setup my program.
I have a biesse skill, plenty powerful enough machine to get the job done.
Rich.C good point, Im sure alphacam has an option to do that....I should learn it.
Bill, yes sanding is a big time consideration. Like I said I havent done many of these...but the hope is to run a little bit longer on the machine and have less hand work when it comes off.
We make our 3D cuts in 2 passes. The first pass is 1/2" core box bit at 50% overlap. It is run 1/4" to 1/2" above the final surface. This pass usually gets done very quickly.
Then we typically run a 1/4" or 1/2" core box bit with a 95% overlap on the finish pass. Shape being cut is the determining factor between the 1/4" and 1/2" bits. The 95% overlap makes for an easily sandable surface.
Feed rate is not a factor as the machine never gets up to full speed with the short steps anyway. As I said earlier we do lower the acceleration rate for smoother machine operation. This slows things down somewhat but results in a better surface on our medium duty CNT router. A heavy iron machine would likely not need this acceleration reduction but I'd think it would still be worth doing so as to ease the forces on all the bearings.
B.H. How you going to get those tendrils, leaf veins, and grape definition with a 1/4" core box bit? I wondered how you got that 1 to 2 hour estimate. I'd suggest you need a fine carving bit, down to nearly a point to get a carving to represent the picture. I thought more like 4 hours at least. Two roughing and 1 final carving.
Take note I said "my guess"........chuckle. I suppose if it can be done that quickly it will take serious time and effort on the software end.
You can create these types of 3D drawings in Enroute but I've never done it. Most of my work is with extrusion of moulding profiles down a curved line.
You obviously aren't going to do the deep V-cuts between the grapes etc. with a 1/4" bit. I'd think you could set up finish passes along those lines with a fine point bit to create the full sculpted effect.
But again this was just an estimate on my part for timing........and hopefully not so far off that it causes trouble! If James McGrew chimes in we'll get a much more informed answer.
I will have machine time on Thursday and plan to run these . I will post my results and how I came to them . I have a couple more that are a bit more intricate and will share my results with that as well .