PDA

View Full Version : What manufacturer used a 1 3/4-8 thread chuck spindle?



oddball racing
05-26-2012, 09:39 AM
Like the title says. I have an old Ellis dividing head and it has this thread and no chuck or plate. Looking for any other sources for a chuck using this thread. I somtimes see people list an item by manufacturer rather than actual back plate size. Just looking to have more hits on my searching.
Thanks, Mike

1200rpm
05-26-2012, 10:05 AM
i think South Bend used it on some of their lathes and my Sheldon 10" also has it.

i`m sure there are others.

FWIW- i think grizzly`s 10x22 lathe uses it too so they may be a source.

high country
05-26-2012, 10:19 AM
Atlas was either 1.5 or 1.75-8......I forget now.

vpt
05-26-2012, 10:33 AM
Atlas 10-12" are 1.5"

Rich Carlstedt
05-26-2012, 10:45 AM
Clausing 10 ", like a 4900 series had 1 3/4-8

Some Sheldons also had 1 3/4"-10

Willy
05-26-2012, 12:05 PM
Lots of sources for 1 3/4" x 8 tpi backplates.
1200rpm mentioned Grizzly as they do indeed use this thread for the 10x22 lathe. There are also others currently using this thread on similar lathes.

There is also the option of purchasing a blank backplate and threading it to suit your application.
I've seen other sources in the past but a quick search this morning got me these from AMTOOLS:

three inch backplate. (http://amtools.com/33-holewith1-34-8thread.aspx)

five inch backplate. (http://amtools.com/53-holewith1-12-8thread-1.aspx)

six in backplate. (http://amtools.com/63-holewith1-34-8thread.aspx)

Kaferhaus
01-24-2015, 11:21 PM
I know this is an old thread but I'm currently having trouble finding a 3 jaw chuck for my Grizzly 10x22 lathe that's this odd size 1.75" x 8 TPI as well. or even a 5" back plate with that thread..

J Tiers
01-24-2015, 11:26 PM
Is not your lathe a "thread-cutting" type?

It is a very satisfying thing to make your tools, as many as you can. No need to make all, making some shows you that you CAN make the others yourself.

And it's very good practice as well.

flylo
01-24-2015, 11:54 PM
Even if you find one that thread it may not fit as I had an older American with the same thread & a SB chuck would start but not thread on. I think SB made their thread a little different to keep business "in house" as I'm sure others did also.

RussZHC
01-25-2015, 06:38 PM
Keep looking, they show up on EBay from time to time and the price is inline with other more common backplates [finding one that is part of the chuck, as in no back plate, and that thread will be more difficult but not impossible (sometimes to gain a very little bit more length of axis)].
AFAIK Wholesale Tool for one have blank with that thread though you will need to turn it down to 5" diameter (I have not checked their website in awhile so...)

I happened across a tap that size so I got that too...its odd but who knows when it will come in handy...my lathe is 10" Sheldon by the way


FYI: there is one on EBay right now, looks OK but its from a good maker so maybe worth the $$$

FYI II: this is one of those occasion where it may help to have your location since someone near you may have one or ...

Try Plaza they often have more than one, cost will depend on condition

kitno455
01-25-2015, 08:44 PM
I know this is an old thread but I'm currently having trouble finding a 3 jaw chuck for my Grizzly 10x22 lathe that's this odd size 1.75" x 8 TPI as well. or even a 5" back plate with that thread..

Get a 1.5x8 backplate for a southbend, and open it up yourself, assuming you have some way of holding it...

allan

QSIMDO
01-25-2015, 10:30 PM
http://www.shars.com/products/view/20186/63_1348_Threaded_Back_Plates_

Bluechips
01-26-2015, 04:42 AM
Tools4Cheap

http://www.tools4cheap.net/proddetail.php?prod=134back8in

Willy
01-26-2015, 12:48 PM
It looks as if the links that I left in 2012 are no longer relevant but a number of valid options have already been presented here in the last couple of days. Wholesale Tools also usually carries them but a quick check reveals that they are currently out of stock.
Another obvious option would be to contact Grizzly Tools for a replacement chuck backplate if you chose to not want to make any chips (cast iron dust).



Is not your lathe a "thread-cutting" type?

It is a very satisfying thing to make your tools, as many as you can. No need to make all, making some shows you that you CAN make the others yourself.

And it's very good practice as well.

This would be my first choice, after all why have a tool with the capability to make what you need and then not use it. Bite the bullet and just get a rough casting and make what you need. You'll learn a lot if you haven't done this before but it will be a fun project. Lots of info both here and elsewhere on the process of making a chuck backplate.


http://i76.photobucket.com/albums/j31/250willy/IM002488a_zpsf4676ae0.jpg


http://i76.photobucket.com/albums/j31/250willy/IM002492a_zps2d956710.jpg


http://i76.photobucket.com/albums/j31/250willy/IM002485a_zps7b4a5b9c.jpg