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Purpose of odd 2-jaw chuck?
- Thread starter Cannonmn
- Start date
- Replies 20
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Does it have one screw with teo opposite sections? or two screws? can't tell, probably does not matter.
No definite reading on the purpose. But it would be just the thing for chucking up pieces of rod to make bushings..... pop it in, drill, next..... probably for roughing, since the concentricity would not be perfect. Any similar purpose, where a shank needed to be chucked quickly and decently.
No definite reading on the purpose. But it would be just the thing for chucking up pieces of rod to make bushings..... pop it in, drill, next..... probably for roughing, since the concentricity would not be perfect. Any similar purpose, where a shank needed to be chucked quickly and decently.
Rob F.
Diamond
- Joined
- Aug 5, 2012
- Location
- California, Central Coast
Not sure of original intent but I would use it for square stock. I have a project right now where I am forging some posts of 1 1/4 hot rolled square into newel posts for hand railing and guard railings. Bottom of post is upset on the end to about 1 3/4 sq and will have a round bar drilled into the end. The round needs to be set into the floor to anchor the post. I do this in the lathe with 4 jaw and cat head in the steady. Face end square and drill hole. This little chuck would be perfect for jobs like that.
Gbent types faster, beat me to it
Gbent types faster, beat me to it
sfriedberg
Diamond
- Joined
- Oct 14, 2010
- Location
- Oregon, USA
2-jaw chucks were more common when rough castings were more common. Just from the title, before seeing the picture, I expected to see a chuck with slip/replaceable jaws, which would have been a standard thing. Jaws would have been customized for the job, allowing either symmetric or asymmetric parts.
Last edited:
john.k
Diamond
- Joined
- Dec 21, 2012
- Location
- Brisbane Qld Australia
Several brands of 2 jaw are listed in my 1970s machine catalogs......I wouldnt be surprised if Pratt Burnerd still sell them.....At one time twist drill chucks were 2 jaw too.....with a single lh/rh screw tightening .........The attraction of 2 jaw was lower price than 3.
Spinit
Titanium
- Joined
- May 13, 2007
- Location
- Central Texas
I have never seen this kind of chuck before. It seems it would be something which does not get used much once the three jaw chuck shows up. With the v shape in the jaws it seems it is something you may use when you do not have a collet chucker. That might mean there would be a few different v sizes to accommodate a range of diameter ranges. Just guessing.
Rob F.
Diamond
- Joined
- Aug 5, 2012
- Location
- California, Central Coast
If he wants to sell it I know it is good enough to do the forgings I am doing. Jaw threads look OK in the pic.
jims
Hot Rolled
- Joined
- Sep 12, 2004
- Location
- Sonora , Calif
I have a power two jaw chuck that uses a drawbar to open and close jaws. I think it is about a 6 inch chuck.
thermite
Diamond
- Joined
- Sep 21, 2011
Castings and forgings is wot these did, the screw-operated ones. No clear bore to the spindle. Plumbing fittings, many of their taskings were.
Not hard to make new screws.
My one is scroll-operated, Hardinge, 6", 2 piece jaws, std blanks. Those can also pass long bar stock.
Making a new scroll is a non-trivial exercise.
Thx for info. This one is old but screw threads etc in new condition, appears little to un-used. Closing is via one offset screw with opposite threads on either end. Thru hole looks like 1” dia. Or less. Offset Closing screw has male square-Drive on each end.
thermite
Diamond
- Joined
- Sep 21, 2011
You don't much want one of these for general-purpose work. Nor even those with two-piece jaws, as I have.
Basically, they were "tooled" for volume production, same part, over and over. With the jaws carved to fit, the part need not be round, not even symmetrical.
All that work went to POWER checks, first on manuals, including turret/capstan, then onto CNC, ages and ages ago.
M.B. Naegle
Titanium
- Joined
- Feb 7, 2011
- Location
- Conroe, TX USA
I've got one that came out of a shop doing motor armature work. One less jaw in the way at the expense of accuracy, so good for quick and simple jobs.
Dumpster_diving
Cast Iron
- Joined
- May 18, 2017
- Location
- Massachusetts
I have one similar, but without the spindle thread backing plate. Instead just a cylindrical spigot at the back about 1" diameter. I speculated it would serve well for holding large taps in a large tailstock (4-5 MT)...but YMMV.
Frank Ford
Hot Rolled
- Joined
- Dec 20, 2003
- Location
- Palo Alto, CA USA
thermite
Diamond
- Joined
- Sep 21, 2011
Few did, back in their heyday.
Taller ones that you see here, yes. Specialized from the factory for plumbing fittings, pipe, this, that, or.. wotever.
Yes, I know of a local shop that still uses them, and has the Low
melting alloy set up (Kirksite ?) in a room with fixtures for making
the custom jaws.
Do allot of castings, so can quickly make up a set as needed.
John Dunn
Aluminum
- Joined
- Jan 25, 2011
- Location
- Minnesota USA
I worked in automotive engine rebuilding shops decades ago and there was an old / unused thing under the bench from decades earlier. 1/3 hp motor driving a slow gear reduction with a chuck like this on the output side. It was for driving Reamers (with various size square drive shanks) when fitting bushings before they went to Sunnen honing equipment.
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