Ackworthie Tapping Head

Some time ago I picked up an Ackworthie Tapping Head, quite cheaply as it came without any collets; I think I gave a tenner for it.

Now I have a little more time, as I retired last year, I was going to knock some up, but have no idea what the originals looked like. I'm sure I can make something that works OK, As I've made a set of metric collets for my Clarkson milling chuck in the past, but I knew what I was trying to achieve, as I already had an imperial set.

I can't find any photos or diagrams on the net anywhere, other than this one for sale on ebay. **LINK** so at least you can see what type of head it is.

Does anyone have one the same and is able to show me either a photo or some measurements of an original collet.

Many Thanks

Bill

Edited By peak4 on 21/02/2016 21:19:07

Hi Bill

From memory I think the collets were double angle with a short parallel part between and a tubular extension from the back, the end part is slightly larger diameter and a sliding fit to the spindle bore.

If you check the inside of the closing nut you should see the angled closer, the other angle is on the inside of the threaded nose.

The collets are slit in 4 places.

Emgee

Thanks for that Emgee, That was what I assumed looking at the head. It would seem that the parallel hole in the body is a smaller diameter than the hole in the nut.

Not quite sure how long the parallel bit is in between the tapers though, and whether the tapers are straight or convex; I'm presuming straight.

Bill

Edited By peak4 on 21/02/2016 22:31:34

Edited By peak4 on 21/02/2016 22:36:47

Bill

Straight tapers but only short, parallel part between about 1/4" long, both tapers OD as per the parallel part.

Emgee