Hi all.
I just purchesed a 1/2 jacobs chuck for my lathe it has a mt1 taper as dose my lathe but it wil not hold.
I think it may be too long but I don't see how that could be.

My question is. If it is too long would cutting it down solve my problem?

Thank in advance for any help

John

It's going to be tough to cut - most likely the shaft is made from very hard steel.

I assume you are putting this in your tailstock, not the headstock, correct?

If the taper is not precise, it will tend to spin. You may wish to contact the manufacturer for a replacement. But before doing that, make sure the inside of your lathe taper is clean, and try inserting the chuck spindle. Then give it a couple sharp raps with a wood block. That may seat it. If not, I think I'd opt for a replacement.

..............

it is going in the headstock and I also use it in the tailstock. I remember reading some were that on the HF lathe thy needed to be cut but I can not seem to find it.

Thanks
John



Edited 1 time(s). Last edit at 02/06/2011 01:19PM by John Candelmo.

You sure it's MT1, because I thought much of their stuff is MT2. In fact, the Jacobs chuck they sell is MT2. I use one on my Excelsior lathe(Rockler house brand), but I'd venture to guess mine comes from some of the same factories overseas as the castings and components are quite similar.

Yes it is an mt1# I did not buy the chuck from the as thy did not have it.. I got the chuck from wood craft.

it holds fine when using sand paper and screen but when I go to cutting tools it loosens up.

Do what Tom suggested and tap it with a block of wood or rubber mallet. I sometimes use mine in the headstock to hold a small mandrel. Maybe try to scuff it a little with sandpaper

Mike (Southgate, MI)
If I don't want to, I don't have to and nobody can make me (except my wife) cuz I'm RETIRED!!

I will thanks

John,
Take your other MT attachments and compare the size and length of your existing attachments to the new drill chuck.
Use a caliper to take measurements at identical spots on both MT tapers. See if the taper is identical.
Then, check for overall length. Some of the inserts have a different flatted on them to put in the "special MT" inserts that are in some pieces of machinery.

I picked up a couple of MT attachments for my lathe, and they had this fltatted end on the MT insert. As a result of the flatted end, the insert would not fit cleanly into the headstock.

The fix was simple. I simply used my chop saw with the abrasive wheel mounted on it to chop off the end of the MT attachment.
Arter trimming the flatted end from the MT attachement the accessory fit fine wiht no slippage.

About the only way to cut this type of hardened material is to grind it of with a grinder, or to use a high speed abrasive wheel to cut it off.

If you have a dremel tool, put in an abrasive disk and you can easily chop through the end of an MT hardened shaft. You might use a few abrasive wheels to get through it, but the dremel will cut the hardened steel just fine.

Also, as Tom suggested - whenever working on a Lathe, always have a hammer to tap an MT accessory into the headstock, or tail stock for a secure mount. Then, use your exit shaft that comes with your lathe and a hammer to tap the MT accessory out of the headstock or tailstock.

Good luck
Roger

Thanks I will check this today. I know it is longer but I don't remember seeing a flatend area on it. I will measure the taper today

On my Jet lathe, I have to crank out the tailstock a bit to get mine to fit properly. If the tailstock is cranked all the way in, then the end of the chuck shaft hits.

Mike Sledden Wrote:
-------------------------------------------------------
> On my Jet lathe, I have to crank out the tailstock
> a bit to get mine to fit properly. If the
> tailstock is cranked all the way in, then the end
> of the chuck shaft hits.


Mike - That's a good point. Some tailstocks have a "bump out" feature that removes the chuck, livecenter, etc. by cranking the arbor into the tailstock rather than having to use a hammer and steel bar to knock it out.

Dan