RE: [CAD_CAM_EDM_DRO] Re: Cheap Servo Motor?

Hi Mike
If you do a search on "servo tutorial" I think you will
find plenty of information on dc servo sizing.

I can give you a short answer though.
Torque is related to current and determines how fast
a machine can accelerate (change speed and or direction).
Moving a bigger mass requires a similarly bigger torque.

Speed is simply related to voltage.

The product of these is power...this is expressed as a complex
term and can be real (something that is converted to heat right away)
or imaginary (when energy is stored).

That being said I or others can size a motor for you.
We need to know:
1) machine moving mass in all axes
2) details of drive system (ballscrew or leadscrew pitch and size, rack
size,etc.)
3) details of the way system
3) The desired speed of the axes
4) How fast you want to go around corners (maximum corner radius at cutting
speeds)
5) expected cutting forces
6) occasional or continuous use?

We can give you a pretty good idea of the motor size you
need if you give us that information. We have motors on the
site below but they may or may not be right for your application.

Les

Leslie M.Watts
L M Watts Furniture
Tiger Georgia USA
(706) 212-0242
http://www.lmwatts.com
Engineering page:
http://www.lmwatts.com/shop.html
CNC surplus for sale:
http://www.lmwatts.com/forsale.html
CNC carved signs:
http://www.lmwatts.com/signwp.html




-----Original Message-----
From: mmeyers1111 [mailto:mmeyers1111@...]
Sent: Wednesday, October 08, 2003 2:13 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Cheap Servo Motor?



I'm in the market to purchase 2 or 3 servos for a 2 ft. by 4 ft cnc
router. The servos are for the X axis, Y axis and maybe the Z. My
problem is that I don't know how to convert motor specs into
meaningful information to determine whether or not a given
servo/motor is a good fit.