twizzstyle wrote:For cutting out shapes I use a 1/4" down-cut two-flute. The down-cut keeps the work pieces from lifting, that's the main reason I use it. Has worked great for me! For profiling I use a big 1.5" straight flute router bit.
I have the same. 1.5050" straight flute that works great at 80ips. Roughing pass in the x axis and finish pass in the Y (tried it after reading this thread and it works like a charm! thanks twizz and M.M.). I also have a .25" down, perhaps I'll try that for this next core to be cut out tomorrow night.
One thing that I'd like to figure out is how to not have the "roughing pass" go all the way down to the depth of the finish pass on bobCAD. I'm sure its simple just have to do some digging.
Same setup as Twizz for me, except I use an upcut 1/4 bit to cut out shapes (better chip clearance)
It looks to me that the cnc J-Skis uses is an "homemade" one (so his max feedrate might be limited) -» maybe this kind of bit reduces the heat at lower feedrates, it looks like the feedrate is pretty low but he cuts the ski shape in one pass... (1/2" bit ?)
A bad day skiing is always better than a good one at work...
That can't be right. I have a huge industrial woodworking CNC and it maxes out at about 12m/m (about 470 ipm). 80ips would be 120m/m, so about ten times the max speed of my machine.
MM your value sounds about right. I usually do core profiles at 6m/m with a 20mm router bit.