Thread: American Type L (long-taper) noser. backing plate

Mick Moyles stocks them but seems to be out of stock.

Lathe Cucks

thanks mate ill look into it

Originally Posted by azzrock

hi every one i need to get my hands on some
American Type L backing plate's
3 or maybe 4.
I have a brand new 3 jaw plus a 4 jaw to mount.
and a mate need some to.
i know i can get them from England for around $ 150 to$250
plus postage. $150 is not to bad but 250 seems steep.
If i cant get them cheaper ill have to make some.

I watched someone make one many years ago. Was a right prick of a job. I'd buy them if at all possible.

You could get the backing plates made as castings if you wanted to go down that path. Probably simpler than finding 8" round these days.

PDW

ok thats interesting just thought the key way would be chalange.
not if i had a broach set
castings from where?
thanks aaron

its just that we need at least 4. im not shore what the postage would be from the uk.
i wish i brought that broach set last week.
any way well see.
aaron

Originally Posted by azzrock

its just that we need at least 4. im not shore what the postage would be from the uk.
i wish i brought that broach set last week.
any way well see.
aaron

Hi aaron.
do you means the two set that was in the auction ?
Peter

See if the local secondhand shop or garage sale will yield some barbell weights of suitable size. Have even seen them on the kerbside.
Combustor.

Originally Posted by thorens

Hi aaron.
do you means the two set that was in the auction ?
Peter

hi peter i do but didnt think it out that much .you were there?
where we chatting at the end??

Originally Posted by Combustor

See if the local secondhand shop or garage sale will yield some barbell weights of suitable size. Have even seen them on the kerbside.
Combustor.

the ones ive seen would be to thin i think.
thanks for the tip
aaron.

Originally Posted by azzrock

ok thats interesting just thought the key way would be chalange.
not if i had a broach set
castings from where?
thanks aaron

A broach set might not help you a lot. That keyway is in a tapered bore. You'd have to make a custom guide bushing which isn't impossible I suppose when I think on it. Piece of cake on a vertical slotter of course.

Here's a couple references anyway.

Lathe Spindle Fittings Page 2

lathe Backplate Fittings

WRT castings my local foundry would do them but as I don't know the mass I've no idea on the price. Probably at least $100 each though so if the freight isn't a killer, I'd buy at $150 each and think of getting the castings if the price got to $250 each. Like everything it's a tradeoff....

PDW

Originally Posted by azzrock

the ones ive seen would be to thin i think.
thanks for the tip
aaron.

Quite right. You need at least 75mm thick and I'd be unhappy with anything less than 90mm myself. Most of that is the boss of course which is why a casting is the way to go.

I have a few backplate castings floating about in the shed that I made for a 2 1/4-8 tpi threaded spindle nose and I was pretty generous on the material (friend had a foundry at the time), I'll go and see what I have WRT boss thickness etc.

PDW

hi again its a funny set up. the key way is on the taper but doesn't run parallel to
the tapper.
it starts out at the tail stock end shallow and gets deeper as it movers backwards.
of course you know this all ready. I for some reason thought a tapered broach mandrel would be the go.
but any slotting operation would do the trick.
IF a blank is going to cost $100, buying them is a better use of my energy's.
last nigh i was trying to think up a plan for making them.
i couldn't reside when to cut the thread.
what sort of lathe do you have again pdw?
ah ps easy way to id cast iron in bar form?
aaron

Originally Posted by azzrock

hi peter i do but didnt think it out that much .you were there?
where we chatting at the end??

ah.
yes we did I think. I was bidding on the shaublin 102VM lathe .

regards
Peter

Hi Aaron,
CDCO have them, less than $100 for an 8". Postage will be the killer. I wonder if Frank will surface freight them?
CDCO Machinery Corp.

Ew