Some help needed with lathe

[Michael GilliganParticipant @michaelgilligan61133]

Victor,

If, as I suspect, the cone angle in your headstock and tailstock spindles is 48° [or thereabouts]; then you might be able to make a little adapter to fit … with a 40° internal cone.

There would be very little material there, but if you also move the internal cone forward a millimetre or two, it would be more substantial.

This will never be as good as properly re-machining the spindles; but it would retain originality, and let you use available collets.

If the lathe was mine, I would try making a few of these, in Brass.

MichaelG.

[Victor francisParticipant @victorfrancis52958]

Hello Michael,

Yes, I did think about making some sort of adaptor but seen as I intend using very small drill bits, I worried about loosing concentricity, The brass suggestion sounds good, I do have some stock here.

The best solution will probably be to get my uncle to make me an arrbor and see if it works out, if it does, it should be simple to make some collets. eventually, I will have to learn to make such bits myself

Kind regards,

Victor/

[Sub MandrelParticipant @submandrel]

To my eye the cone angle in the photos looks about 40 degrees. Although Tubal Cain suggests 40 is commonest with a few lesser angles used, the link Michael gave includes examples with 45 and 50 degree included angles (it gives the half angle). It may be that teh maker had access to some American collets.

Neil

[Victor francisParticipant @victorfrancis52958]

Hello Neil,

Thank for the info. I have been looking at the sheet and see what you mean.

Strange that there is so little information about such things online, just goes to show how rare some things are.

It might also be that the lathe was not made in the UK, I know nothing of its provenance apart from the fact that the last owner built live steam engines. Of course.he did not build the lathe. I wonder how old it actually is.

What attracted me to the lathe is how unique it looks, the downside is that the tooling seems as different to the norm as the lathe is.

On Monday,I willbe able to get the dead centre measured properly, this is bound to be of help.

Kind regards,

Victor.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Stub Mandrel on 02/11/2013 17:08:42:

To my eye the cone angle in the photos looks about 40 degrees.

Neil

.

Neil,

Given that we "know" the cone angle on that RGD drill arbor to be 40°, I beg to differ.

But, of course, only direct measurement will tell.

MichaelG.

[Victor francisParticipant @victorfrancis52958]

I am pretty certain that the top of the RDG cone measures 12mm, the dead centre exactly 1/2.  Seen as both cones are of the same lenght, 1/4, my dead centre's angle is bound to be greater.

Unfortunately, I cannot measure the angle until Monday, but they are most certainly different.

Kind regards,

Victor.

Edited By Victor francis on 02/11/2013 19:04:54

[Author]

Posts