Hi!
Time to start the newest project for the shop - a cnc with three routers running separate bits.
The reason for three spindles:
First - drill holes
Second - cut slots and other types of pockets
Third - cut out shape
In a production environment, that means handling the product three times, which is not very efficient or profitable.
Decisions already made:
Primarily an 8020/Aluminum/Steel build, using bearings and parts from CNCRouterParts.
Shape cutting router 3+HP
other routers between 1Hp and 2HP
K2CNC router mounts
Mach3 (of course)
Gecko Drives (the only drives I haven't fried)
First problem to tackle:
Ball screw vs Acme vs R&P
This is an old discussion, but I would like opinions on the subjects of torque and holding strength. I will be cutting skateboard decks, which requires cutting though 1/2 inch 7ply Maple plywood in one pass (thus the 3+HP router.) The accuracy of all three methods are within required specs, but which system would best be able to handle the force required to plow through the plywood? The long axis (gantry) is the weak link in this area. The image (not to scale, of course) shows the basic layout of the machine. The "X" shows where the operator will be standing. The three Z-axes will be mounted on the same plate, using the same Y axis, but operating separately.
Thanks in advance for your help!