Gallery, Projects and General > How do I??
Alternative to backplates
Darren:
I'd really like a faceplate and 3 jaw chuck on my Smart & Brown lathe.
Trouble is it has a 2" dia threaded nose and ready made plates are almost as rare as Dodo's
I have found one in two years of constant searching and this currently holds my 6" 4 jaw chuck.
But I was thinking, Uh oh..... :ddb:
I have a couple of these, one in 50mm and one in 100m dia
Do you recon I could mount a chuck to the larger one and thread the smaller one to take a 1/2 threaded faceplate I have from another lathe?
Or even a Myford thread, as there is all sorts avail for these?
The real question is would a 5C fixture be up to the task :scratch: it looks pretty tough to me, but i though I'd throw this one out to the wind and see what comes back?
Darren:
Aww, forget the last idea, I have no way of threading it, won't fit in the mini lathe.
But the 1st idea sound feasible?
bogstandard:
Darren,
I wouldn't like to go too large a chuck size.
On the ones I used for converting to Myford nose, I kept the largest to 125mm, and if you saw my post, I made a basic faceplate out of the same sized backplate. Going over that is really putting a large strain onto the fine threads of the 5C system.
John
Darren:
Thanks John,
Isn't the 5c locked by a keyway? Mine is, the threads just pull it back.
I don't think I'd trust the mass of a big chuck but maybe a slimline one kept down to 100 or 125mm dia.
Oooh, I wonder if I have the power to used this?
Doubt it.....
http://cgi.ebay.co.uk/MYFORD-HEADSTOCK-NOSE-THREAD-DIE-1-1-8-X-12-BSW_W0QQitemZ260345165436QQcmdZViewItemQQptZUK_Home_Garden_PowerTools_SM?hash=item260345165436&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A7|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A50
bogstandard:
Darren,
It isn't just the threads, it is all of it. Because it isn't a solid lump, it will be nowhere near as strong as if it was all one solid spindle. That is why I kept mine down to the smaller sizes and do no heavy cutting with them.
I saw that die when you showed it earlier. Really, what you should do is single point the thread roughly to size, then finish off with the die to give the true thread form. If you try to cut in one go, just using the die, you only have to be a gnats out of square and you will be in deep doodoo.
Really, the best bet would be to mount the blank into your 5C carrier, then cut the thread using single point. But rather than Myford, I would use something like a Boxford thread, which is the same as Atlas, some South Bend and a few other large lathes. That would then give you access to much cheaper second hand nose fittings, rather than Myford, which tend to be expensive even second hand, purely because of the name.
John
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