Lathe quiery

Bikes or not. Whatever
keith.hodgenia
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 250
Joined: Sun Feb 27, 2011 11:53 am
Location: Nantwich. Cheshire East
Contact:

Lathe quiery

Postby keith.hodgenia » Sun Aug 11, 2013 7:17 pm

Can one of you talented engineers run through the process of mounting a lathe chuck onto a mounting plate. I would like it to be centred when I finish!
The chuck has 3 threaded holes on the back that don't go through to the front and the mounting plate just has it's mounting thread in the centre. Keith.

chaz.wheeler
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 151
Joined: Sun Jul 15, 2012 8:37 am
Contact:

Postby chaz.wheeler » Sun Aug 11, 2013 9:19 pm

sounds like either you have two different fitting items or you are missing an adaptor.
there is usually a register/spigot that the counterbore on the chuck locates on and the three threaded holes have bolts that pull it back onto the plate.
on a threaded central location the chuck just screws on and its centralised.

nevhunter
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 4145
Joined: Tue May 10, 2011 9:42 am
Location: Victoria.. Australia.
Contact:

Postby nevhunter » Mon Aug 12, 2013 1:22 am

The original Myford (as an example) chucks screw on to the spindle direct. If you are fitting another chuck which has blind threads (3) and a step on the rear face for alignment, you have to purchase or make an adaptor that has a good fitting thread that bottoms on a nice face so it maintains alignment. All you have to do is mount the adapter on the lathe spindle and machine it to fit snugly onto the back of the chuck, then drill the three mounting holes for the bolts. Nev

keith.hodgenia
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 250
Joined: Sun Feb 27, 2011 11:53 am
Location: Nantwich. Cheshire East
Contact:

Postby keith.hodgenia » Mon Aug 12, 2013 11:02 am

Thanks Nev and Chaz. It's easy when you know what you are doing. I hadn't thought of machining the face of the mounting plate. Keith.

User avatar
Bob.Murphy
Holder of a Silver Anorak
Holder of a Silver Anorak
Posts: 959
Joined: Thu Nov 29, 2012 10:32 pm
Location: Kirkliston, on the West side of Edinburgh.
Contact:

Lathe Chucks:

Postby Bob.Murphy » Mon Aug 12, 2013 11:32 am

Keith,

'Chronos' have mounting plates and chuck combinations. Its a good site for info as well.

http://www.chronos.ltd.uk/cgi-bin/ss000001.pl?RANDOM=NETQUOTEVAR%3ARANDOM&PAGE=SEARCH&SO=1_3_4_0&SS=chuck+mounting&ACTION=Search&TB=A&PR=-1&GB=A&SX=0

My 1950s Denford Viceroy lathe has a threaded mandrel that the chuck & face plates screw onto (1.5" X 8tpi if memory serves) but I have a couple of blank mounting plates as well - just ready for attaching other devices.

Warning: The Chronos website is very bad for your wallet (I spend a fortune there :cry: ).

Good luck with it.

Bob.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH

Mike Nash
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 191
Joined: Thu Jan 10, 2013 9:43 pm
Location: Hurstbourne Tarrant, Andover, Hants.
Contact:

Postby Mike Nash » Tue Aug 13, 2013 8:32 pm

Well Keith, as a bodger rather than a proper engineer can I add a thought?

My very ancient Drummond round bed lathe has a couple of extra chucks which are secured to mounting plates that screw onto the lathe mandrel in usual way, but the holes through which the bolts go that hold the chuck on to the plate are slightly larger than the bolts' diameter. So with the bolts just nipped up its possible to gently tap the chuck with a soft hammer and with a dial gauge on a bar held in the chuck to ease it central in relation to the mandrel by tapping and turning it.

I thought they were all like this! Regards, MikeN.

nevhunter
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 4145
Joined: Tue May 10, 2011 9:42 am
Location: Victoria.. Australia.
Contact:

Postby nevhunter » Wed Aug 14, 2013 3:48 am

It should be located by the step in the face . If the adapter becomes out of true you can turn the face down again as long is there is sufficient thickness in it. Chuck direct on mandrel is the most rigid and best. The more the chuck hangs out from the spindle the more it will chatter when parting off etc. Nev

keith.hodgenia
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 250
Joined: Sun Feb 27, 2011 11:53 am
Location: Nantwich. Cheshire East
Contact:

Postby keith.hodgenia » Wed Aug 14, 2013 8:28 am

Hi Mike, being a fellow bodger, your solution was what I had in mind. However machining the mounting plate sounds like more rigid solution. Keith.

john.whiting
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 1705
Joined: Sun May 22, 2011 2:10 pm
Location: Brisbane QLD
Contact:

Postby john.whiting » Wed Aug 14, 2013 9:55 am

Yes ,its best to reduce overhang of the chuck as far as possible.Its allways preferable to thread the inside of the chuck for mounting ,even if you need an adapter to match sizes.If you reverse the chuck,and grip the spindle end,you automatically centre the chuck,and can use your own lathe if you don't have another chuck. While on the subject of lathes, if you see an old lathe being scrapped,allways check it out to see if a bike gearbox has been used somewhere. I recently salvaged a near new army Indian Chief gearbox and clutch from a large old lathe loaded on a low loader headed to the scrapyard.The funny thing is the owner of the lathe is an old bike fanatic,yet he d never noticed the gearbox.He still doesn't know.Regards John.


Return to “Main Chat Forum”

Who is online

Users browsing this forum: No registered users and 9 guests