ER40 Collets on a 13" South Bend Single with 1 7/8 8 TPI Spindle?

Turning your own out of solid stock is doable, but takes some skill and tooling. You would be best to cut the spindle thread, mount the stock and then proceed to cut the collet taper and ER nut thread which is metric. You also need someway to hold the chuck when unding the ER nut, I machine sume wrench flats into my ER40 chuck that I made. Alternatively you could get a back plate, mount it and then machine a registration step so you can use a set-tru mount ER chuck similar to what Alan did on his PM-1340GT.
https://www.hobby-machinist.com/threads/shars-er40-chuck-on-a-pm1340gt.68998/
http://www.shars.com/5-er40-zero-set-fine-adjustment-collet-chuck
 
How about some pics??

I'm taking pics as I proceed; it just takes a long while as I have precious little time to commit to projects in general and machining is but one of many facets. When it's done or at least near done; be it good, bad, or otherwise I'll make a thread about the process and what I've learned, but it's not likely to be anytime soon, unfortunately.
 
Da da!
Thank you Bob.
I found I have a mt4 spindle, bought a mt4 to mt3 adapter so now I can use my mt3 centers, drill chucks etc.
I found the lathe dog driver with my spindle threads on eBay. These are getting quite rare as I had but few choices.
Some people think the old dogs are worth their weight in gold.
Shoot, if I have to I’ll buy a few from Grizzly.

232C330B-E78B-4131-9B63-E64A79806139.jpeg

33A06571-A27A-4045-BBAE-5042A4718635.jpeg
 
Da da!
Thank you Bob.
I found I have a mt4 spindle, bought a mt4 to mt3 adapter so now I can use my mt3 centers, drill chucks etc.
I found the lathe dog driver with my spindle threads on eBay. These are getting quite rare as I had but few choices.
Some people think the old dogs are worth their weight in gold.
Shoot, if I have to I’ll buy a few from Grizzly.
Glad that it works for you. I have three mt3 reamers, but no mt4 reamers, and I have precision ground flat stones that do a great job of cleaning up burrs on mt taper OD's if you want to try to clean some of them up. Also have Prussian blue. We could test them for runout and fit.

I have a bunch of dogs, but they never seem to fit the job and the machine at the same time when I need to use one, so I end up making one for the job or cobbling something together to get it done. I was going to make a dog driving plate and I have the metal and a D1-4 back plate for my lathe, but the more I thought about the design for it, the more I remembered how nothing seems to fit when I need it. So, I am just going to make it to fit the first project that needs it, and then modify it as needed for every subsequent job... In some ways I prefer cutting a soft center in place in a chuck and then using the chuck jaws to drive the dog. Seems to go faster, and is inherently accurate.
 
I am familiar with what you are saying, using the chuck jaws to drive, it seems like a popular/efficient choice.
You would think the weight of a cast iron dog would be hard on the spindle bearings, but, this method has been used for a long time.
I look forward to using this new option on my lathe.
Thanks for everything Bob!!
 
You would think the weight of a cast iron dog would be hard on the spindle bearings, but, this method has been used for a long time.
The dog just pushes against the jaw or catch plate. It only pushes as hard as the cutting tool does, and the dog does not normally bounce against the chuck jaw. They just turn together, staying in contact. The dog does not mark up the chuck jaws at all, in my experience.
 
Making one for my Sheldon. Threaded the bore for the spindle and put it on to finish up.

IMG_20180120_165704.jpg
 
I configured a draw bar for the M4 taper-ER40 Chuck.
The next thing to do is to make a backing plate for the, through hole ER40 chuck.

drawbar.jpg

ER40 Back Plate.JPG

Er40 chuck.jpg
 
Making one for my Sheldon. Threaded the bore for the spindle and put it on to finish up.
Cutting the internal 8TPI thread on the Dura-Bar is giving me night twitches. That and addition to getting it exactly centered.
Good job on the Sheldon.
I like your work light :)
 
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