How can I do it without the fixture shown in this video - Driving Pulley

[DaveH]

Wong,
I have a Sherline RT and Tom is correct, the Sherline RT will not rotate freely enough.

DaveH

[Brian]

I think you will also have to calculate the diameter of the piece so the final pcd of the teeth is correct or it will just chew it up.

Brian.

[stevec]

[Brian]

(10-29-2013, 10:54 AM)TomG Wrote:

(10-29-2013, 10:26 AM)Wongster Wrote: Tom, I've a rotary table from Sherline with stepper motor mounted. Will this do? I will check if it can rotate freely. This will simplify the process.

Wong,

I doubt that a rotary table would be free enough. Maybe you could just mount it on a bolt with a couple of jam nuts to take up the end play. Then mount the bolt in the tool post of your lathe and the tap in the spindle. Use a bolt with an unthreaded shank so it doesn't chew up the bore of the gear.

Tom

To follow on from Tom
Then use a taper tap in the chuck set the cross slide to the correct depth for the pcd then use the compound or saddle to feed onto the tap, do not plunge cut as shown in the video.
If the tap has a point use a hollow center to support it, hollow centers can be made by simply center drilling a piece of bar grease well.