New servo from ebay...but will it work

[bgolash]

Hi
I have some specs on this Baldor servo motor. I`m wondering if its large enough for my DIY router. I`m using a .2 ballscrew and will gear down the speed of the servo from 5000 to 1000 rpms.

MT-2250-ACYCN
Max Speed 5000
Torque Stall 50 oz-in
Max Voltage 60
Voltage Const. 12.0
Current Peak 18.5

I did visit the Baldor website but the specs on the motor I have does not
seem to match the specs on the website. Mine seems to have a lower
current peak then any of the motors that match closely in serial number.
http://www.baldor.com/products/servo...r/dc_servo.asp

[ViperTX]

at 50 oz-in stall torque.....it most likely won't work...unless you're moving feathers around...

[Al_The_Man]

Where did the 50 oz-in come from? It does'nt jive with the other specs given. Going by the Baldor site, I suspect it is higher than 50 oz-in.
Al.

[bgolash]

Hi Al

I got the 50 oz-in spec off the nameplate of the motor. I`m wondering
if that is 50 oz-in is per amp. Seems to me I`ve seen that relationship
listed on other motors. Baldor has tech email ..I`ll run this by the
tech. I too didn`t feel the specs seemed right. It has a max current
of 18.5. That spec matches Jeff`s motors at homecnc and they are
360 oz-ins.

Regards Barry

[bgolash]

Hi all

I posted at the yahoo gecko usergroup and got this reply. This info
maybe helpful to other members.

"The 50oz-in is the continuous stall torque. The motor can run stalled at
that torque all day. The current will be 3.42A at this torque. The peak
torque is (50/3.42)*18.5 = 270oz-in. Note that you must not exceed 18.5A
at any time or you will permanently damage the magnets of the motor.

A safe peak torque is probably around 150oz-in (at 10.26A). You can use
this torque for your acceleration calculations. This should give you a
theoretical peak thrust of (150 *5 * pi) /0.2 = 11780oz = 736lbs.
Allowing for friction losses etc, say 500lbs. Maximum safe cutting
thrust will be (50 * 5 * pi)/0.2 = 3926oz = 245lbs. Say around 200lbs
to allow for friction.

Those figures sound pretty good to me. You could probably get away with
a lower reduction ratio, say 4:1 or even 3:1. This will probably make
the gearing a lot simpler and would of course give you higher feed rates."

[pstockley]

Whats the name of the gecko user group?

[ger21]

Originally Posted by pstockley Whats the name of the gecko user group?

Geckodrive

[cnogueiraneto]

Maybe Lb-in in the site all is Lb-in