Servo Motor question

[jl123]

Heh

I was scared to install the Z conversion and ballscrew without the gas spring. I figured it'd just slam down if the gib wasn't locked. I installed the gas spring before anything else.

[Ron111]

JL123,

Don't forget, although the effeciency of the ball screw and ballnut system works against the holding force of the Z axis, there is enough to prevent the head from moving too rapid. I suspect that the downward travel would simulate closer to creeping down vs. slamming down.

[itsme]

Hi there,

I'm keen to use servos on my next mill (which is still many many months away...), but one of the biggest problems I have found so far while just looking around, is that servo motors are difficult to find. I know people use DC motors from places like the Surplus Centre (I think that's what it is called) and add encoders, but what other options are there?

I've come across 'proper' servo motors, but those are expensive. Most of the servos I've seen have been from electronic component suppliers and they run well into the hundreds of Pounds each - too much for my hobby use.

Where on earth are reasonably priced, decent servo motors found (for something like an X3)?

Regards
Warren

[fkaCarel]

This seems to be the general German solution:
http://www.dunkermotoren.de/default.asp?lang=2

[phantomcow2]

I think that DeskCNC sells them, also Homecnc.info sells some. Smaller DC motors with encoders are pretty much it though

[syil]

Originally Posted by Deviant Cost.... usually. Servo's cost more, and the controllers for them. Alot of people are of the opinion that with the new stronger steppers. You don't miss steps and don't need to worry as much about the servos. I have servos for my x2, but they are in a box somewhere, waiting for my garage to be unpacked.

could your post your servo x2??
thank you..hehe

[Deviant]

My x2 never got servo'd. Everytime I start, life kicks me in the butt.

I think I'm close now, but looking at ordering a taig to remove the possibility of another conversion delay.

But, I have almost everything for it.
x2 mill.
3 250oz servos with 250ppr encoders.
3 gecko 320s
1 Dual output 25v 400a toroid
1 600v 35a bridge rectifier
120000 UF 80v Capacitor.

I have all the materials to complete Steele's conversion.

Need to pickup a break out board and plate to mount everything on.

Albeit, I'm torn on the taig. I like the travel and the fact that it's ready to go out the door. More or Less. But it looks dinky in all the pictures. More so compared to the x3. I really won't to get something made.

I think I've invested over 11k in trying to make something now. Between the lathes, mills, building my old shop running power. Then I changed jobs and moved. Got everything in the garage now on my table waiting for the chips to start flying.

[FPV_GTp]

Originally Posted by MacCNC I have servos on my X3 and they are working really well. The motors cost quite a bit more but the drives are about the same (assuming quality parts like Geckos). I really overkilled it on mine, have 400oz on X & Y and 800oz on the Z. I feared it would not be enough torque to lift the Z in rapids without a spring attachment but it has enough to lift the head plus a buddy off the ground hanging on for dear life!

Hi MacCNC

what are the chances of some pictures of your setup
and some details on the conversion.

where did you buy the servos from ??

I think everyone is after DC servo motors but the biggest killer is the expense

cheers

[MacCNC]

FPV_GPp,

I got the servo motors from Dan Mauch at camtronics and am using Gecko 320s. The link to Dan's page is:

http://www.camtronics-cnc.com/

Click on the servo motors link at the left. I got the MCG ID23-005 motors for the X and Y and the MCG ID33003 for the Z.

I wish I could tell you something good about the price but I can't. I spent $800 for the motors with encoders. Don't get me wrong, I love them and the performance is great (would be really great with a G-Rex instead of a parallel port), but I think quality steppers would work as well for less $.

Don't have any pictures of the motors but you can kinda see them in this video:

http://www.cnczone.com/forums/showth...975#post185975

The duct tape is to keep the encoders clean until I can make something better

Mac