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Questions on Drill Chuck for a Mill

A

AmericanMachinis

Plastic
Joined
Feb 25, 2019
Hello, I am sourcing a drill chuck for a Grizzly mini-mill (MT3) that I bought used and is missing the chuck.

I'm torn between a china junker for ~$70 shipped or trying to buy a better quality used USA chuck. A lot of the used USA chucks I see have threaded attachments to the spindle adapter. If I have a chuck with a threaded attachment, won't the chuck run itself off when I use a left-handed drill bit?

Left-handed drilling is specifically what I need to do with this new chuck... drill out a small bolt.

Thanks!


(PS. chuck needs to fit an MT3 arbor and hold 1/16" drill bit.)
 
Threaded reversing hand drills have a small screw down the chuck into the arbor. They are often left hand thread. pitch is not the same as the main chuck thread mount.
Bill D.
 
Thanks! So i guess these chucks I'm finding must have been for hand drills? Then i might have an issue finding an arbor that fits MT3 with threads...

Guess I'll keep looking for one with a taper?
 
The spindle is a MT taper

The arbor will be MT to a JT taper

The drill chuck will be smaller, perhaps 1/4” max capacity, with JT taper to match arbor.

Lathe Tailstock 0.5-13mm (Jacobs Jt6) MT3 Arbor Heavy Duty Drill Chuck + Key | eBay

There are odd beasts (jt33) that have an integral threaded ring to install/remove the chuck. Ignore those for the time being.

You may need a threaded arbor, instead of flatted tang.

Read the manual.
 
Your mill is either Morse taper #3 or R-8. Probably MT3 and the chuck is not threaded but has a Jacobs taper.
Go to ( Little Machine Shop) website and there you will find the chuck and taper adaptor . Also any thing you need for mini-mills and mini- lathes are on this site.
Check the forum rules before posting.
mike
 
EPAIII said:
I would still do it right.
Click to expand...

My thoughts exactly. I'm looking at NOS Jacobs USA made chucks. And will need an adapter to the MT3.

Looks like for similar money i can get a "good" china chuck or a real US chuck.

I'd rather get something that is good quality now and pairs well with a better lathe later too.

Thanks to everyone for the help.
 
I don't know about the New Jacobs chuck, when talking to MSC I was told all Jacobs chucks are being made in China. I have quite a few Albrecht keyless chucks which are very good and accurate. Ones I have on my mill fit the SPI quick change adapter J6, I'm stuck with J6 because that is the only taper available. One came with a Chinese chuck mounted, I curse the thing every time I use it! Will slip holding a #7 drill! I forgot the brand but supposed to me a better grade Chinese chuck. One I ordered was supposed to be TIN coated, I was called and told it was discontinued but I accepted the hard chrome one. Dam thing is just like the other. Seems the problem is in the pilot on the key, it's too small and the key slips. I have a number of older Jacobs chuck on my lathes, key fits great and does not slip! That's why I wanted to get a Jacobs with J6 taper from MSC and told that Jacobs was made in China. I do have a Rohm keyless that works good. I too would like to find a good key type chuck to fit J6 for my mill.
 
Thanks. Now I'm looking at Rohm keyless chucks :)

Given i currently have the mini-mill i may just go with a cheaper rohm for now. As long as the quality is good it'll be fine. I don't forsee daily use at this stage.
 
Stay away from keyless is left hand drilling is your priority. They can open up in reverse under load. Albrecht does make a "locking" chuck, and they'd be my go to anyway for keyless, but they are also about the priciest.
 
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