14.5 Southbend 5C collet question

JamesYanco · Jul 20, 2020

I have a southbend 14.5 lathe. Just purchased a 5c 3 jaw chuck.

Lathe has a 5c draw bar, when I attach the 3 jaw chuck it tightens up but there is slop left. Feel like there should be some sort of attachment to go inside the spindle with a taper. As the 5c attached to the 3 jaw chuck is tapered. Thoughts and recommendations please.

Rogue Willie · Jul 20, 2020

Typically there is a spindle nose adapter the screws on to the spindle and contains the taper for the collet. I'm curious about the 5C fitting at all. I have a 1946 14 1/2" with a 2 1/4"-6 threaded spindle and a 5C won't fit. I think you could get 3C collets for it.

johnoder · Jul 20, 2020

Rogue Willie said:
Typically there is a spindle nose adapter the screws on to the spindle and contains the taper for the collet. I'm curious about the 5C fitting at all. I have a 1946 14 1/2" with a 2 1/4"-6 threaded spindle and a 5C won't fit. I think you could get 3C collets for it.

Indeed - as late as Catalog 100-F (August '46) the 14.5 had a 1 1/8" spindle bore with 3/4" collet capacity

JamesYanco · Jul 20, 2020

Hopefully this picture helps. There is the draw bar with the 3 jaw chuck. Also the coller that threads on.

There’s a piece missing I’m fairly sure.

texasgeartrain · Jul 20, 2020

You are missing an adapter. Its a special south bend taper, externaly, to fit in spindle. Internally, the 5c's go. Nothing threaded on it.

Note the piece on collet rack, bottom row, center. That's it.

Its also one of the 3 pieces in this listing:
South Bend 14-1/2" 16" Metal Lathe 5-C Collet Closer and other lathes | eBay

JamesYanco · Jul 20, 2020

I did see that add on EBay Tex, kinda figured that was the piece. Wanna sell me the one in your pic? &#55357;&#56833;&#55357;&#56833;&#55357;&#56833;

Hoping maybe someone comes along that has one for sale. Any idea if someone out there makes one? I did a quick check on MSC and KBC found nothing. Then again your post said it’s a special South Bend size.

johnoder · Jul 20, 2020

Apparently - from page in HTRAL - ANY (10, 13, 14.5 and 16) of the 1" collet lathes used this same part - 1.629 at gage line and .602 taper per foot on dia - outside

texasgeartrain · Jul 20, 2020

Someone makes them still today, been a while, and I forget who. But I saw a post a good while back about it.

Could be Miller Machine and Fabrication, but I thought it was someone else. But I can tell you they made my spindle test bar, and it is real nice. I don't see it listed in their services page, but they are not fancy on their web service. They answer the phone if you call, and they answer questions:
Products – Miller Machine and Fabrication

I'm just curious about the 5c chuck. Is it for small work, or something special ? You using a regular chuck normally ?

JamesYanco · Jul 21, 2020

It is for small work. I make little sterling and flame eater engines. I normally use a 10” 4 jaw independent chuck and would take the real small stuff into work. Work has a small Enco with a 4” chuck on it.

May remove the chuck and mount it in the 10” until I come across the piece I’m missing.

JamesYanco · Jul 29, 2020

Update: picked up a 5c adapter. With the thread guard on I kinda thought it would be more of a flush fit. Not so much sticking out in other words. Same with the 4 inch chuck.

Not sure I’m feeling it. Put a dial indicator on the piece of brass and it is showing .011 out. .004 on the chuck body and .003 on the 5c adapter back plate. Am I not setting it up correctly/do I have the wrong 5c adapter?

rjs44032 · Jul 29, 2020

Hello James,

First thing, pull the 3-jaw off the spindle and indicate the tapered bore of the adapter for runout. It should be better than 0.0005" or something's wrong. If so, inspect the sleeve / spindle bore for burrs or nicks and stone them. Then blue up the sleeve and ensure proper fitment. There are a plethora of spindle tapers and they can look very similar to a wrong one.

Once the adapter sleeve is fitted properly, then install the chuck and recheck the runout. Hope this helps.

Best Regards,
Bob

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