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davidh
02-08-2008, 12:01 AM
i have a number 14 jacobs chuck called a spirial gear chuck. it needs a special spirial cut key to tighten it. its also about 4 years older than dirt.
i called jacobs customer service and they kinda laughed at me. . . . no one there thats old enuf to remember i was told.
its only a 1/2" but its in beautiful condition and if i use a rubber strap wrench i can tighten it enufto hold smaller bits tight but i would like to have the real key if anyone knows of one. i could take a picture of it if anyone can help me or has a need to see it. . .
thanks in advance
davidh

BadDog
02-08-2008, 12:57 AM
I've seen them, and yes, they are VERY old. But I don't know where you'll get a picture of one, much less a key.

davidh
02-08-2008, 02:08 AM
as far as a picture is concerned, i have the chuck so a photo is pretty easy. but i do want a key to fit it. . . . . . .

Fasttrack
02-08-2008, 02:24 AM
Sorry i can't help, but i'd love to see a picture - i like old tools!

IOWOLF
02-08-2008, 07:21 AM
Make one. :)

davidh
02-08-2008, 10:54 AM
i will post a picture today. make one ? maybe if i could see a real one first. but then again i really don't think i have that talent. but then again. . .

Paul Alciatore
02-08-2008, 10:59 AM
Sounds like a museum piece to me. Perhaps a carefully worded E-Bay search might yield results in 5 or 10 years. I doubt you would have much trouble winning the bid.

But why would they use a spiral? Seems like it would make it easier to tighten or to loosen depending on the direction of the spiral. But why? It just seems like a lot of trouble to manufacture for no real advantage.

davidh
02-08-2008, 12:30 PM
we' try a couple pix's here. . .
<a href="http://s260.photobucket.com/albums/ii12/tooldoc/?action=view&current=spirialchuck.jpg" target="_blank"><img src="http://i260.photobucket.com/albums/ii12/tooldoc/spirialchuck.jpg" border="0" alt="Photobucket"></a>
<a href="http://s260.photobucket.com/albums/ii12/tooldoc/?action=view&current=HPIM0547.jpg" target="_blank"><img src="http://i260.photobucket.com/albums/ii12/tooldoc/HPIM0547.jpg" border="0" alt="Photobucket"></a>

davidh
02-08-2008, 12:32 PM
lets try again
http://i260.photobucket.com/albums/ii12/tooldoc/spirialchuck.jpg
http://i260.photobucket.com/albums/ii12/tooldoc/HPIM0547.jpg

BadDog
02-08-2008, 12:37 PM
I think the spiral was to help keep the key seated when really reefing it down tight. However, I've got to believe that was less than successful when trying to open the chuck after such a tightening, which is likely why we don't see them now (along with more complex/costly manuf).

JCHannum
02-08-2008, 12:41 PM
They turn up from time to time, but I have never seen a key. This is one in the 8-1/2 size.

http://members.aol.com/jchannum/jacobs

It has a patent date of 1925 and is marked Super Chuck in script the same as the early Super Chucks. They were apparently the first version of the Ball Bearing Super Chucks as they use the same size designations; 8-1/2, 14 etc. But they were probably a short lived version as I can see that it would be possible to get the chuck quite tight, but loosening would drive the key out.

davidh
02-08-2008, 12:52 PM
with the heavy duty serrations on the outside, i just used hand tightening for a 1/4" bit and it held. too nice to sit on a shelf. jacobs had no interest at all, not surprised at that. .
i will probably just keep using it with a HF rubber strap wrench to tighten it as its sooooo nice and true for my purposes. thanks for the input

sconisbee
02-08-2008, 01:23 PM
I'm almost certain i have seen a key for one of these at a surplus tooling place near me, they have a ton of old stuff, ill take a look over the weekend and see if its still there, if it is i can easily get it then stick it in an envelope to the US or where ever.

davidh
02-08-2008, 01:59 PM
fantastic. . . . .
email tooldoc@birchindustrial.com
david
tons of thank yous !

davidh
02-24-2008, 02:47 PM
I'm almost certain i have seen a key for one of these at a surplus tooling place near me, they have a ton of old stuff, ill take a look over the weekend and see if its still there, if it is i can easily get it then stick it in an envelope to the US or where ever.


did you ever find key for my old chuck ?