Hi Guy's.
I am in the process of designing a new CNC 3 axix router for wood/plastics etc, I have given the spec to a large german servo company and they have come back with motor sizes I don't agree with( and a price to match $28K maybe nervous of the project ) here is the basic layout information given to them, and I was wondering if one of you could verify servo motor sizes/torques for the 3 axis.
Project is a CNC wood/plastic Router.
Table working area size is 3,040mm X 1600 mm Z axis movement of approximately 350mm.
Style of build is a traveling gantry ( single drive in the centre )fixed table.
X axis gantry will be driven by a single central ball screw, mounted under the table with a diameter of 40mm with a pitch of 20mm maximum speed of the ball screw is around 1016 rpm )
The weight of the gantry complete with the router should not exceed 150kg and will be supported by two linear rails 25mm with 2 bearing blocks per side.
Acceleration I would assume to be around 0.5sec about 0.1g
We are intending to mount the servo motor on the gantry cross brace under the table and drive the ball screw with a tooth timiming belt ratio + - 3 :1
Cross Y axix will be a 25mm ball screw with a pitch of 10mm speed of maximum 1110 rpm. ( torque can also be reduced with a toothed belt ).
The Z axix will be a 16mm ball screw with a pitch of 5mm required to rotate at 2500 rpm max.
The Router motor I would like to use will be in the order of 7.5Kw to a speed of 20,000 rpm and the size of cutter will be a maximum of 20mm dia ( feeds will be in the order of 5 meters per minute.
with this size cutter and up to 25 meters per minute for the small 6mm cutters ). (PS maybe someone can offer a router motor Culombo have an agent here who will not sell me a unit, thy build routers).
Kind regards
Chris Flint  |