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I decided to stay with my 495 holding torque stepper motor  and timing pulley ratio and add the Taig lathe chuck to fit the 3/4" ER32 collet. This way I can remove the Chuck and use the ER32 collets.
The pictures will show the Newer 4th axis setup.

2011-03-25_1314.jpg

The ER32  fit the 3/4" ID bearings,  just a nice slip fit.

Need to make a Swarf/ Dust Cover
mvc015f.jpg

4thside.jpg

Added a spring loaded block to clamp the ER32  for the wrench.
Also added a chip/swarf  plastic cover.

block1.jpg

Motor fits in a milled pocket

Small Ball Bearing added for Backlash takeout.
May add another bearing below.

4thback.jpg

4thfront.jpg

mvc-018f.jpg

mvc-019f.jpg

I seen this gearbox used a while back. Thought i give it try, only cost around $17.00. So far it looks like its got a lot of power. Drawback is, it only has 18 to 1 ratio. I'm waiting on a ER32 arbor to replace the spindle. This was a good idea except I didn't like the motor.

gearsteppermotor.jpg

4th Axis with 495 oz-in holding power stepper motor,
30T Timing Pulley and 15T Motor pulley.

With Bearing Preload adjustment.

Rear View Click to Enlarge pictures
4th_axis2.jpg

All the Parts
parts1.jpg

Mounting Plate
mount.jpg

Note:
Shaft inprovement, would be to machine the Shaft with 3/4-16 NF threads on both ends. Then the hole thru the Shaft could be used for long small stock. The other end would fit a 3/4-16 threaded Chuck.
These bearings are 3/4" Timken wheel axle bearings.

Shaft and Bearings
shaft1.jpg

Bearing Housing
rside.jpg

Bearing Cups
bearing_cups.jpg
Housing was made from scrap aluminum

Rear Bearing
bearing_cone.jpg

Shaft with preload adjustment
back.jpg

4th Axis CNC Indexer Setups

New 4th Axis CNC Indexer Program
Click On Pictures to Enlarge

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