Hi Dennis,

Thanks for all the information.? The odd thing about my collets is that they seem to be .004 - .005 undersized from the advertised dimensions for thread diameter and shaft diameter.? That said, I don't see how that could account for the complete lack of thread engagement.? I'll try to send it back.

Thanks again,

Peter

On 3/1/25 2:48 PM, Dennis Turk via groups.io wrote:

One other thing I forgot.? The end gear on the end of the spindle is also special as it has an extended sleeve that supports the lever operated closer to the end of the spindle.? The lathe in the picture was originally a pedal powered lathe that I found in California.? It was missing many things including the pedal setup as well as the tail stock?and compound slide.? What remained was in almost like all new condition and as I had the missing parts I was able to complete the lathe.? I also used a cast iron pedestal?for mounting it as it originally?had a Lot 6 lathe secured to it. The chip tray is original to the pedal?lathe. The last picture is of how the lathe was displayed at my business building along with 29 other restored lathes, shapers and drill presses. After selling my business in ;2019 all these display machines had to be removed and most of them are now in storage at my home.? Anybody need a lathe got lots of them:-))))

On Sat, Mar 1, 2025 at 11:40?AM Dennis Turk via <dennisturk448=[email protected]> wrote:

Some additional information.? A lever operated collet closer had to be ordered when purchasing a Dalton lathe.? The casting that supports the end door hinge for a lever operated collet closer lathe is totally different that what most have.? The casting has to support the end of the lever collet handle.? Also the casting that covers?to pupper part of the spindle?is also special to a lever operated collet closer as it has to have the two pins that support?the tilt up collet closer guard.

On Sat, Mar 1, 2025 at 11:35?AM Dennis Turk via <dennisturk448=[email protected]> wrote:

Hi Peter

I have Dalton as well as SB and Hardinge 3C collets.? They only vary a couple of thousands?in outside?thread diameter but that is not the critical dimension.? The?pitch diameter?of the thread? is what counts, not the outside diameter.? If your collets slide in and out of the threaded end of the draw tube this is very odd.? It may indicate that the thread in the draw tube is totally?worn out as I have seen this on a couple of SB draw tubes.? Especially?on the lever operated collet closer as they can exert way more force than a hand wheel draw bar. As to lever operated Dalton draw bar setups they are very rare.? I have one for a Lot 6 and Dalton 9 inch but do not have one for the smaller lathe.? I only know of one that is owned by a guy near Chicago and he loaned it to me when we exhibited?at the NAMEs model engineering show in 2016.? Ralph also has many other Dalton accessories we only see in catalogs. Pictures attached were taken when Ralph loans?me his lever operated collet closer.? Just some information guys.

On Sat, Mar 1, 2025 at 9:31?AM pling via <pinglis74=[email protected]> wrote:

Well... I've got a problem.? I ordered a 3C Collet Draw Bar from Ebay
that is a bit longer than the Dalton draw bar I have.? I chose to do
this because I didn't want to butcher the Dalton draw bar for more
extension.

I received the draw bar but when I went to screw in the Dalton collet it
just slid right in. No thread engagement at all.? I looked up 3C collet
dimensions and as you would expect there are more than one dimension
documents that don't appear to match.

South Bend collet dimensions for a #3 collet which is claimed to be
compatible with 3-C collets shows an overall length of 2 7/16 which
matches my Dalton collet.? The diameter of the collet shaft is .6495 on
the chart and my Dalton collet diameter is .645, a difference of .0045.?
The thread length on the chart for a 3-C is .750 and the Dalton collet
thread length is .600.? The thread diameter on the South Bend chart is
.642 which is very close to the Dalton collet thread diameter.

The inside diameter of the draw bar where threaded is .654 which allows
my Dalton collets to slide in and out.

Before I ask to return this draw bar I want to make sure that it is not
3-C as advertised.? I can't find a thread diameter on the SB chart that
matches it so it may be a metric draw bar.

I was under the impression that 3-C was a hard standard but if mistaken
please set me straight.

I want to make sure that I am correct before I ask to a return the draw bar.

Thanks,

Peter