PDA

View Full Version : JFK collet closer - how to remove hub??



1200rpm
05-16-2013, 08:08 PM
i`m not too sure about this and don`t want to force anything...

I`m trying to remove the hub adapter from the end of the spindle on my Yamazen Lancer lathe.
looking at JFK`s site there seems to be 2 types of hubs - press on and threaded.

I have never messed with one of these before and don`t know if there is a way to tell the difference from outward appearance.
JFK mentions 2 set screws for the press on adapter, and no mentin of set screws for the threaded adapter.
in any case I can only find 1 set screw - which I removed( there was not another underneath it)

I have pried on it and tried to turn it but no joy...

anyone have a clue?

here`s a pic of it- the screwdriver points to where the set screw was.

http://i1078.photobucket.com/albums/w494/hobbymachinistpics/1368748601.jpg (http://s1078.photobucket.com/user/hobbymachinistpics/media/1368748601.jpg.html)

J. Randall
05-16-2013, 10:17 PM
Not familiar with your machine, but have a question. Those 3 holes in the face, looks like there is a screw in one of them, if they are threaded could you put longer bolts in them and pull it off by screwing them in? Looks like a split line just a little ways inside.
James

1200rpm
05-17-2013, 04:07 AM
that was what I assumed, but they are blind holes, only there to hold on the what JFK calls the "indexing ring". I had it off, but re installed it to give me a lip to pull against

the headstock on this thing seems to be a dead on copy of a variable speed Logan headstock - which I am also unfamiliar with and for some reason there is about zero information I can find on the net.

I would have thought Logan information would be easy to come by, but apparently not, and information on the Yamazen is non existant.

I appreciate the thought!

RussZHC
05-17-2013, 07:12 AM
I am guessing you know but if not: http://www.loganact.com/, IIRC Scott (?) Logan is usually pretty good at returning inquiries or perhaps someone within the Logan group on Yahoo!

Edit: don't know if it will help but there was a closer sold recently on EBay and the photos are still up (in one photo it sort of looks like there is a second set screw but that could just be the photo or a different model, or my vision) http://www.ebay.com/itm/JFK-Lathe-5c-Collet-Closer-/111051718251?pt=LH_DefaultDomain_0&hash=item19db32be6b&ssPageName=RSS:B:SHOP:US:101

DR
05-17-2013, 11:48 AM
Not sure if it'd be any help, but Jet used a JFK closer clone. Years ago I bought one and put it on an 11" Logan. It's been so long I don't remember anything about the installation other than I had to either shorten or lengthen the draw tube by silver soldering.

Of all the lever closers I've used, mostly Hardinge, I recall the Jet clone was not nearly as smooth operating, whether that was Jet's doing or JFK's are that way I don't know.

Is JFK still in business? How about calling them?

rode2rouen
05-17-2013, 12:01 PM
Is JFK still in business?


Yes.
http://www.jfkprecisionproducts.com/


Rex

1200rpm
05-17-2013, 02:32 PM
Russ, that does help a lot- just seeing some close up pics of the JFK closer.
I`m betting that this one is threaded like in the pic.

we`ll soon find out...:D

thanks!

1200rpm
05-18-2013, 07:54 AM
or not!!
still stuck on there, I put way more toque than I`m comfortable with and nothing. not even a hint...

I think I may be asking the wrong question- this machine`s headstock appears to be a direct copy of a 14" Logan, and the JFK hub *may* have replaced the original "keeper"

so I may be better off asking "how to remove spindle from 14" Logan??"

rode2rouen
05-18-2013, 11:32 AM
or not!!
still stuck on there, I put way more toque than I`m comfortable with and nothing. not even a hint...



Have you tried heat?
I'm not talking "cherry red", or any other color, but rather just hot enough that you don't want to touch. If it is threaded, this may be enough to get things turning.


Rex

1200rpm
05-18-2013, 12:31 PM
yes, I have heated it/soaked in PB blaster multiple times and nothing.

I`m hoping someone with a 14" Logan will chime in... it has me baffled so far.

it could even be a left hand thread but without knowing I`m afraid to put much torque on it.

1200rpm
05-18-2013, 01:22 PM
success!!!

I use a little mirror and a pen light to look in the set screw hole and saw that it was indeed threaded.

stuck some ice cubes in the spindle hole, heated it up one more time and used a pipe wrench with a big @ss cheater bar...

BOOM!!! "oh, @#$%!!"

thought for sure I broke something, but it was just the collar breaking free- whew!!! :)

good thing it`s a D type spindle-so I could block against a chuck jaw- if it were threaded I would have been outta luck!

http://i1078.photobucket.com/albums/w494/hobbymachinistpics/1368897115.jpg (http://s1078.photobucket.com/user/hobbymachinistpics/media/1368897115.jpg.html)

http://i1078.photobucket.com/albums/w494/hobbymachinistpics/1368897073.jpg (http://s1078.photobucket.com/user/hobbymachinistpics/media/1368897073.jpg.html)

RussZHC
05-18-2013, 08:03 PM
still stuck on there, I put way more toque than I`m comfortable with and nothing. not even a hint...


I`m afraid to put much torque on it

good to see I am not the only one with such "fear"...bit paranoid because I tend to over-tighten and don't mind "leaning on things"...not sure how entertaining it is when the whole machine moves but bolt/nut stays put...ha, ha?

Glad you had success!

rvjwelch
06-03-2013, 01:49 PM
I have one myself. To remove the hub, put the bar in from the tailstock and clamp it in the chuck of the lathe, leaving the end of the bar at the end of the hub. Use a three jaw bearing puller to jack the hub off, with the center bolt in the bearing puller against the bar that is being held from moving by the chuck.
Bob

rvjwelch
06-03-2013, 01:51 PM
Whoops, This is supposed to be a reply re how to remove hub on JFK lever collet closer. Mine is a Pre Cor by King Machinery and JFK is a close of that closer.

rvjwelch
06-03-2013, 01:52 PM
I have one myself. To remove the hub, put the bar in from the tailstock and clamp it in the chuck of the lathe, leaving the end of the bar at the end of the hub. Use a three jaw bearing puller to jack the hub off, with the center bolt in the bearing puller against the bar that is being held from moving by the chuck.
Bob

jimsehr
06-03-2013, 03:30 PM
Remember, when you put it back together to just tighten the 3 screws on the end and indicate that end plate od as true as you can. Then tighten 3 screws. So it will run true.
jimsehr