polishing spindle taper threads

Hi out there......

Decided to treat myself to a 30mm dia polishing spindle.....

I have the shaft and bearings and a good friend just donated a 3hp, 3phase motor....

so need to make the tapered threads, any idea's or just taper the shaft and

cut the threads by hand...drudgery.....??

many thanks Frank in France...

Was discussed a while ago in this thread

Look at this video:http://www.youtube.com/watch?v=I57FCsvUajg

Convert your lathe to cnc, then it's a doddle....

(ducks the brickbats...)

This youtube video shows "Doubleboost" making a taper spindle

And part two.

HI again,

I did try the search function on the forum, sorry I wasted ur time......

Very pleased with the results tho.......quite liked the thread cutting arrangement on the u tube video....

yes I know I'm sad...hahaha...

thanks again..Frank in France........just started the learning curve......

What a wonderful video, I loved the accent and the use of descriptive language when things went wrong at the end.

Doug

That was quite tame for him.!

Nick

The thread Jason linked to was started by me.

I've since managed to turn a pretty reasonable pigtail mandrel using a neat little gizmo from a Hemingway Kit ...

**LINK**

It's made it an expensive and time consuming solution but it's very satisfying when you eventually get there.

I turned the taper and cut the thread with the same effective tailstock offset (approx 8mm) but to get a steep enough taper it was only possible to cut it on a short section of stock which was then screwed onto a mandrel with a threaded nose.

I'll try to post some pics.

Jon