calculating expected max cutting force required
where to begin?


Looking to design a r/p table with 3.6 gear ratio for 4x8 table with dual
y motors. With x and y using NEMA 34 HIGH TORQUE STEPPER MOTOR 1160 oz-in

What are you cutting, and what are you using for a spindle, and how fast do you want to cut?

What are you cutting, and what are you using for a spindle, and how fast do you want to cut?


going to be cut oak 3/4 raised panel doors, some light alunmin
machining for future parts for cnc add ons, some mdf for doors,
want to do verneer inlays for table tops floors etc. see pic of inlay
below..... want this boy to have speed...
just say dont want to be there all day cutting one part
lets say, for now a cnc router ... if all goes well i will design or buy a diy spindle, or buy a resonable low cost one.. not sure where they price out if u bought off shelf? any one phase units out there?

spindle?

If you use a handheld router for the spindle, figure 30-50lbs or so. If you use a real spindle (5HP), you can figure closer to 100lbs or so, maybe 150. That should get you in the ballpark

If you use a handheld router for the spindle, figure 30-50lbs or so. If you use a real spindle (5HP), you can figure closer to 100lbs or so, maybe 150. That should get you in the ballpark


so if you did diy spindle from 3-5 hp ac motor gear her down 8000 rmp
I still would need 100 lbs.. how to cal that respect to motors ...should i go servo on x, y on a large table 4x8 what my pro and cons

calculating expected max cutting force required
where to begin?....

It might sound a bit funny but this it not what you need to worry about. In one of your posts you say; ..... want this boy to have speed... and speed is pointless without acceleration. You need to size your drives to obtain the acceleration and speed you want; the acceleration load is much greater than any cutting load.

It might sound a bit funny but this it not what you need to worry about. In one of your posts you say; ..... want this boy to have speed... and speed is pointless without acceleration. You need to size your drives to obtain the acceleration and speed you want; the acceleration load is much greater than any cutting load.

the speed comment was refering to time it takes to complete a cnc job
from beging to end..... in hours

so where do I start... in figuring out my accelation speed / load
evering thing is in a design mode still.. open to suggestion...
machine will be a rack and pinion desgn.. 2 y motors.... with timing shaft to
pinion / motor table size larger enought to cut a 4x8...
x is a ball screw for now. 5/8x .2 x motor same size and torque as Y axis
( have not order them) z drive ballscrew 5/8x .2 motor 480nm

y axis will be some kind of linear rail

Perhaps this will help.

Good Luck,

Or this:
http://www.cnczone.com/forums/showthread.php?t=31815