I have placed an ad for some 430 oz in peak servo motors in the classified section. They are great for the Shoptask CNC ready models. I can supply the motors with a C23 to Nema34 adapter plate so the motor will bolt right up to the installed mounts. These are awesome motors with 250 cpr encoders. 1000 ppr in quadrature and work great with the Gecko G320/G340 servo amps. With a 3/1 or 4/1 timing belt ratio you will get awesome speed and performace from these motors. I also sell servo drive kits and assembled and tested units. See
www.camtronics-cnc.com
Here is the narrative from my ad
This is for one New Moog 430 oz in ( Made in the USA) PM DC servo motor model 23L55-30. Additional motors are in stock. It has a .315 diameter shaft about 1"Long. These motors are commonly used on full size round column and square column mill drills and the Sieg X2/3 mill rills. These are great motors that will a 3/1 ratio timing belt drive will give your cnc retrofit a great motor with awesome speed. I had my retrofit running at 90 IPM with awesome power These are the same motors that Jeff Davis uses in his excellent Mill Drill Retrofit plans at .
http://www.homecnc.info/plans.htm. Data sheets are available. The motor has a C23 frame and face mounts but for an additional charge I can supply a C23 to Nema 23 adapter plate. The motors are rated at 36VDC and 1700 RPM but can be run at higher voltages. My 36VDC 25A power supply is a perfect match. See
www.camtronics-cnc.com for other motors and this power supply kit. I also sell Gecko servo control enclosures all set up for Gecko servo amps. Camtronics has 13year experience with low cost CNC systems and can help you select the correct motor for your application. These motors are $169 ea plus s/h