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john11139
02-25-2015, 08:32 AM
I turn a few generator armatures. I have a regular 5/8 Jacobs chuck with the brass jaws. But sometimes I have to smooth up or turn a armature out of a drill or something pretty small that the Jacobs wont go that small or slightly larger. Years ago I seen a chuck that would mount in the tail stock just like a 3 jaw chuck but it had a roller bearing on each jaw. Where could one of these be purchased at. I looked on E-bay but really don't know what it is called. Haven't seen one in years. They have hundreds of chucks on there but haven't found what I am looking for.

MrSleepy
02-25-2015, 08:52 AM
The important word is "Live" ... which indicates it has bearings to freely rotate.

There are plenty ....."1/2" HD Drill Chuck On Live Ball Bearing Tailstock Center With MT2 Arbor ... for $50 on ebay
eg..
http://www.ebay.com/itm/291328451540


or 4 jaws
http://www.ebay.com/itm/4-Jaw-x-3-Self-Centering-Live-Bearing-Tailstock-Lathe-Chuck-On-MT2-Arbor-New-/291362726419

or plain screwed arbors
http://www.ebay.com/itm/Live-Ball-Bearing-Tailstock-Chuck-Adapter-Center-1-x-8-TPI-with-MT2-Arbor-NEW-/371198828100

There are also a few ER25/32/40 live collet holders on Ebay from China aswell.

Rob

john11139
02-25-2015, 10:08 AM
The one with the chuck might work. Sometimes I have to turn a elec. motor with a shaft 1" so the Jacobs wouldn't work. The one I was looking for was a 3 or 4" 3 jaw chuck with a small roller bearing mounted on each jaw and I think it came with reversible jaws set. Sometimes I turn 3" PVC pipe and make plugs or caps for suction hoses (to keep dirt. out) so I thought the one I am looking for would pretty nice as there would be less mass turning than a 3" chuck mounted on a live center. If I cant find what I am looking for, I have a ole 3 jaw chuck and I might just try and mount it on a live center.

john hobdeclipe
02-25-2015, 10:16 AM
http://www.victornet.com/alphabetic/Chucks-Tailstock/383.html

Ian B
02-25-2015, 11:47 AM
The chucks shown in the link all rotate. Although this will do what the OP's after (and probably better, as the chuck can be tightened on the work), his request was for a chuck that doesn't rotate, but with bearings for the work to run in. Basically, a tailstock-mounted fixed steady.

How about just using a normal fixed steady? If the chuck option is really needed, I'd suggest starting with a chuck that has soft jaws - then drill & tap for studs to mount the bearings.

Ian

wlpier
02-25-2015, 12:36 PM
You know they make live tail stock centers with interchangeable tips…. Including some cups for non-centered shafts.

But you certainly logged another project into my “To-Do” list…. Make tip to adapt a drill chuck….

Arcane
02-25-2015, 01:23 PM
I turn a few generator armatures. I have a regular 5/8 Jacobs chuck with the brass jaws. But sometimes I have to smooth up or turn a armature out of a drill or something pretty small that the Jacobs wont go that small or slightly larger. Years ago I seen a chuck that would mount in the tail stock just like a 3 jaw chuck but it had a roller bearing on each jaw. Where could one of these be purchased at. I looked on E-bay but really don't know what it is called. Haven't seen one in years. They have hundreds of chucks on there but haven't found what I am looking for.

I have one of those little chucks; it came with a lathe I bought a long time ago and I've used it a few times but I can't help you with finding one.

Stu
02-25-2015, 01:49 PM
Do you mean one of these:

http://i913.photobucket.com/albums/ac334/bstupak/chuck1_zpscauw5csq.jpg (http://s913.photobucket.com/user/bstupak/media/chuck1_zpscauw5csq.jpg.html)

This came with an Atlas lathe I just got. It clamps onto the tailstock spindle. The chuck does not rotate, only the bearings rotate.

Stu

oldtiffie
02-25-2015, 06:32 PM
Any help?

https://www.google.com.au/search?q=lathe+live+centre&biw=1536&bih=732&tbm=isch&tbo=u&source=univ&sa=X&ei=Q1vuVNDOCeGrmAWq0ILgCQ&ved=0CDcQsAQ

https://www.google.com.au/?gws_rd=ssl#q=lathe+live+centre

MrFluffy
02-26-2015, 05:28 AM
Do you mean one of these:

http://i913.photobucket.com/albums/ac334/bstupak/chuck1_zpscauw5csq.jpg (http://s913.photobucket.com/user/bstupak/media/chuck1_zpscauw5csq.jpg.html)

This came with an Atlas lathe I just got. It clamps onto the tailstock spindle. The chuck does not rotate, only the bearings rotate.

Stu
Ideas... What would be really interesting would be a four jaw version, that way you could also use it as a offset rolling centre should the desire take you, and also allow you to adjust truly concentric in use...

CCWKen
02-26-2015, 06:51 AM
I do a few antique starters and generators occasionally but I use a/the ball bearing on the armature and use a pipe center in the tail stock. I do this when cutting the commutator so I know the surface is concentric to the bearing center line. This pretty much eliminates any brush bounce. Even though the armature shaft may have a center drilling, I don't trust a 100 year old center. They usually aren't. :)

As a note: I may have misidentified the center as a "pipe center" but that's what I've always called them. It's a dead center style with a reverse cone into the center body. It's very old. It is NOT the bull nose style center.

J Tiers
02-26-2015, 08:37 AM
They can be either, or both.

These are both, although they take nothing smaller than about 0.3" diameter as a cup center.

http://img.photobucket.com/albums/0803/jstanley/cup_pipe%20centers_zpsmyrfcbld.jpg (http://smg.photobucket.com/user/jstanley/media/cup_pipe%20centers_zpsmyrfcbld.jpg.html)

You kind of have to decide if the end of the OD or the center is more accurate on the part you have. The end of the OD is often torn up, but then the center is often rusty or dinged-up also. The cup center depends on the edge of the end of the OD being perfect, and the regular center depends on the center drilling being OK. In many cases neither is any good, meaning that neither approach will work well.

That's probably the reason for the bronze jaw chucks. The bearing area is usually good even if nothing else is, and that's generally what rides on the bronze jaws.

Yes, you can clean up a bad center, and may be able to clean up a rough edge on the shaft, but the bearing area is known to be good or you probably wouldn't be messing with the thing.

I have not tried it, but I suspect that a regular chuck could be outfitted with jaw covers to do just as well as a purpose-made bronze jaw chuck. They don't have perfect centering either, and a small error will only cause a slight taper to the commutator, not an out-of-round, so long as the chuck jaws do not rotate with the armature.

John Stevenson
02-26-2015, 08:37 AM
What about this.

http://www.arceurotrade.co.uk/imagecache/68d489b0-02de-4dff-983f-9c3300bd1632_413x218.jpg

Then you can put whatever you like on it, 3 jaw or 4 jaw, within reason.

http://www.arceurotrade.co.uk/Catalogue/Chucks/Lathe-Chucks

dian
02-26-2015, 10:27 AM
"What would be really interesting would be a four jaw version, that way you could also use it as a offset rolling centre should the desire take you, and also allow you to adjust truly concentric in use... "

if you offset the four jaw, the bearings will fight the stock.

dian
02-26-2015, 10:28 AM
What about this.

http://www.arceurotrade.co.uk/imagecache/68d489b0-02de-4dff-983f-9c3300bd1632_413x218.jpg

Then you can put whatever you like on it, 3 jaw or 4 jaw, within reason.

http://www.arceurotrade.co.uk/Catalogue/Chucks/Lathe-Chucks

what bearings are in there?

EVguru
02-26-2015, 10:38 AM
I have not tried it, but I suspect that a regular chuck could be outfitted with jaw covers to do just as well as a purpose-made bronze jaw chuck.

Apart from the bronze jaws an armature chuck has a locking mechanism on the size adjustment. Might be a way of re-purposing an otherwise scrap chuck. Bronze weld up the jaws to form a bearing surface and add a means of clamping the body once set to size.

John Stevenson
02-26-2015, 11:20 AM
what bearings are in there?

Round ones

dian
02-26-2015, 01:03 PM
thanks.

Toolguy
02-26-2015, 02:40 PM
John-

Do those tailstock chuck holders come in a 3MT size?

CCWKen
02-26-2015, 03:37 PM
The cup center depends on the edge of the end of the OD being perfect, and the regular center depends on the center drilling being OK. In many cases neither is any good, meaning that neither approach will work well.

The OD is the bearing's ground edge that's on the armature shaft. It's what will ultimately determine where the armature runs so it should be good enough. It has so far for me. I don't use cheap bearings.

Rosco-P
02-26-2015, 03:56 PM
what bearings are in there?

dian, do you mean what is the TIR? Somewhat important for a rotating or live center.

john11139
02-27-2015, 11:19 AM
Do you mean one of these:

http://i913.photobucket.com/albums/ac334/bstupak/chuck1_zpscauw5csq.jpg (http://s913.photobucket.com/user/bstupak/media/chuck1_zpscauw5csq.jpg.html)

This came with an Atlas lathe I just got. It clamps onto the tailstock spindle. The chuck does not rotate, only the bearings rotate.

Stu
Bingo- you get the prize. That's what I am referring to and looking for. Most people have never seen one or heard of it. Any one have one that they don't use, let me know.