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Ballscrew kits use 5/8" Thomson ballscrews with a .200 pitch. Here is a link to the Thomson catalog page with detailed information on the ballscrews. All ballscrews are now polished, they are no longer black, but shiny sillver as shown in the kit #4 photo.

 

Kits #1 and #2 require an extended X axis leadscrew that comes with the power table feed. The Grizzly mill we purchased came with it. If you have a shorter, version of the X leadscrew, don't worry, they are only $9.95 from Littlemachineshop.com click HERE to go directly to the extended screw order page. If your motors do not have a 1/4" shaft, let us know so we can ship matching couplings.  

Mini-Mill CNC kit #1 - Three axis conversion

 

This Kits includes everything, three NEMA23 motor mounts, thrust bearings for each axis, shaft collars, lovejoy spider motor couplings, a BALLSCREW for the Z axis, and metric cap screws. You do not need to modify your mill to install this kit. This kit can also be upgraded to ballscrews on the X & Y axis.

 $409 Click to enlarge
 
Mini-Mill CNC kit #2 - no 'Z' axis
 

This kits includes, two NEMA23 motor mounts for the table, thrust bearings, shaft collar, lovejoy spider motor couplings, and metric cap screws. You do not need to modify your mill in any way to install this kit. Buy this kit if you want to make your own custom Z axis motor mount.

 $259 Click to enlargeClick to enlarge
 
Mini-Mill CNC kit #3 - 'Z' axis only
 

This kits includes, one NEMA23 motor mount for the Z-axis, thrust bearings, a BALLSCREW, shaft collar, lovejoy spider motor coupling, side mounting block for the ballnut, and metric cap screws. You do not have to modify your mill to install this kit. Buy this kit if you want to make your own X-Y motor mounts.

 $259 Click to enlarge
 

Mini-Mill CNC kit #4 - with X-Y BALLSCREWS

 

Same as Kit #1 but with BALLSCREWS for the X and Y axis. Extra hardware for installing the ballscrews is also included.

 $559 kit4
 
Mini-Mill CNC kit #5 - with X-Y BALLSCREWS
 

Same as Kit #2 but with BALLSCREWS for the X and Y axis. Extra hardware for installing the ballscrews is also included.

 $409 Click to enlargeClick to enlargeClick to enlarge
 
Mini-Mill CNC kit #6 X-Y BALLSCREW UPGRADE
 

This includes 2 BALLSCREWS for the X-Y axis and all hardware needed to mount the ballnuts under the table. You can use this kit if you previously purchased kit #1 or #2, and you now want to upgrade to ballscrews.

 $259 Click to enlarge
 
The X-Axis extension is now shipping with kits #4 & #5. You will not loose any travel on the X-axis with these kits. Kits may take up to 2 weeks to ship. Sorry for any delay guys, but we are trying to get the kits machined and shipped as fast as possible.

An installation guide for the mini mill kit is in progress. Added a couple videos milling some junk aluminum on the X2. Feedrate was 20 IPM at 2500 RPM.

pic2

specsheet
manual
partlist
quicktime
 
You will need DIVX to watch these videos. Click HERE to download it FREE!DivX

Ballnut options

 $40 One Pre-Loaded Ballnut We pre-load the nut with the largest oversize balls that will fit and still allow smooth movement, to lower the backlash between the nut and the screw. Each ballnut is matched to its screw. You can add up to three Pre-Loaded ballnuts to your cart, depending on your kit.
Heli-Cal Coupling - ZERO backlash
 $30 Heli-Cal zero backlash coupling. These are premium aluminum couplings, designed for servoes. ZERO BACKLASH. These will fit a 1/4" stepper/servo motor shaft. You will lose a small amount of X travel with these couplings undless you grind a small amount of relief in the saddle. Only two couplings can be used with KIT #1, three couplings need for KIT #4. If you are NOT purchasing these with a kit please specify your screw shaft diameter.