Headstock Mandrel

[PeterDRG]

Hi guys

I welcome suggestions. I made a headstock mandrel for my Boxford, but the cone just revolves instead of pulling up and spreading the end. The one I made for the Hobbymat works fine. Any thoughts on what I should do ?

 

[goldstar31]

imho It has more to do with the INTERNAL diameter and only monute adjuents to the diameter are possible.

I made one to a recognised design for one previous lathe and then bought a lathe with a different diametr and then bought a similar lathe to. the former---- and so on.
I am sure that you will realise that there is literally and expanding wedge. Repeating myself, it is probably less bother to msske a new mandrel body and use the handle only,
Here- some years ago, I saw an expanding bolt anchor designed for goinmg into concrete or brick/stone masonry being used as an alternative.

If that is the case, or possible asight of a builders catologue is an idea.

Regards

Norman

 

[Charles Lamont]

Put a tiny radial pin in the cone to fit in a (slightly widened) slit. But first, daft as it sounds, try some grease on the cone.

 

[BaronJ]

Hi guys

I welcome suggestions. I made a headstock mandrel for my Boxford, but the cone just revolves instead of pulling up and spreading the end. The one I made for the Hobbymat works fine. Any thoughts on what I should do ?View attachment 126667

It might just be as simple as pulling the rod back so that the nut grips the inside of the cone.

When I made mine I used a quite shallow taper, a locking taper. This does mean that I have to give the nut a tap in order to release the handle.

Here is a picture of the end of mine.

And one of the other end.

It only takes a single turn of the nut to lock it in place.

 

[goldstar31]

Again, there is - or was. the one on the Chris Heapy site.

It had a handle that could be detached. I used my one on the mill vice.

 

[deverett]

Again, there is - or was. the one on the Chris Heapy site.

It had a handle that could be detached. I used my one on the mill vice.

Ah, yes. Chris Heapy's site. Recommended reading for all tyro machinists.
http://web.archive.org/web/20050921130713/http://easyweb.easynet.co.uk/~chrish/homepage.htm
Dave
The Emerald Isle

 

[goldstar31]

Ah, yes. Chris Heapy's site. Recommended reading for all tyro machinists.
http://web.archive.org/web/20050921130713/http://easyweb.easynet.co.uk/~chrish/homepage.htm
Dave
The Emerald Isle

Thanks Dave

~There is still a lot of information
For newcomers- like me= I like John Moran's GadgetBuilder.com.

There's a bit from our BaronJ about 4 facet drill grinding.

GadgetBuilder would answer a lot of unnecessary questions here

Long may it flourish

Norman

 

[ajoeiam]

Ah, yes. Chris Heapy's site. Recommended reading for all tyro machinists.
http://web.archive.org/web/20050921130713/http://easyweb.easynet.co.uk/~chrish/homepage.htm
Dave
The Emerald Isle

It is a real pity that the community (of machinists and such like) is not able to maintain and continue such treasure troves of information after the passing of their founders!!