Jacobs Drill Chuck.

[jcdammeyer]

Watched this video.

Then decided to attack this chuck which is really hard to turn. It's the 3/4" that came with the Craftsman Drill Press. Hardly ever use it. Too big most of the time.

Methinks it's been dropped once or twice.

 

[DavidR8]

Jeepers, that's really pooched!

 

[jcdammeyer]

Yeah. I don't need 3/4" all that often but it's nice to have for that occasional use.

The one that is normally on the drill press is a no name brand but the chuck key has missing teeth.
And I haven't found a key that fits all that well. A K3 sort of does but not quite.

I have this one that came with the mill. 1mm-16mm with a M18 taper (~5/8"). It came with an R8-M18 arbor but what I really need is an 3MT-M18 to be able to use it. Haven't found it at KBC yet. I should check Aliexpress.

 

[DavidR8]

I have several keys that I inherited but don't fit any of my chucks. Have a look at them tomorrow.

 

[jcdammeyer]

Ah. $12.66 + $13.97 shipping will get me an MT3 B18 arbor. Should I or shouldn't I...

 

[DavidR8]

For $27 for sure!

 

[Tom Kitta]

Ah. $12.66 + $13.97 shipping will get me an MT3 B18 arbor. Should I or shouldn't I...

Here found cheaper one - https://www.amazon.ca/Othmro-Lathe-...id=1659492273&sprefix=mt3+b18+,aps,223&sr=8-9


One day delivery for $22 CAD!

MT3-B18 Drill Chuck Arbor, Morse Taper Shap Holder Connector Rod with Tang End Self Tightening Toolholding Connecting Adapter for 6JT Drilling : Amazon.ca: Tools & Home Improvement

MT3-B18 Drill Chuck Arbor, Morse Taper Shap Holder Connector Rod with Tang End Self Tightening Toolholding Connecting Adapter for 6JT Drilling : Amazon.ca: Tools & Home Improvement

www.amazon.ca

 

[Tom Kitta]

Rebuild kits for Jacobs chucks are expensive even on auction.

Expensive == like $50 for rebuild kit for 1/2 in chuck

More then $50 for 3/4 ball bearing chuck.

Essentially once rebuild some old beaten up chuck ===> brand new Jacobs chuck.

 

[jcdammeyer]

Here found cheaper one - https://www.amazon.ca/Othmro-Lathe-Extension-Drill-Arbors/dp/B081ZWZ7ZN/ref=sr_1_9?crid=30CDTDW2NMVDU&keywords=MT3+B18&qid=1659492273&sprefix=mt3+b18+,aps,223&sr=8-9


One day delivery for $22 CAD!

MT3-B18 Drill Chuck Arbor, Morse Taper Shap Holder Connector Rod with Tang End Self Tightening Toolholding Connecting Adapter for 6JT Drilling : Amazon.ca: Tools & Home Improvement

MT3-B18 Drill Chuck Arbor, Morse Taper Shap Holder Connector Rod with Tang End Self Tightening Toolholding Connecting Adapter for 6JT Drilling : Amazon.ca: Tools & Home Improvement

www.amazon.ca

Done. Should be here Saturday.

I don't use the Craftsman drill press enough to justify a ball bearing chuck like the one I splurged on for the mill.
I have only one 1/4" chuck with a TT holder. I'd like to get a few more so I can have more than one drill bit in the tool rack.

 

[jcdammeyer]

Rebuild kits for Jacobs chucks are expensive even on auction.

Expensive == like $50 for rebuild kit for 1/2 in chuck

More then $50 for 3/4 ball bearing chuck.

Essentially once rebuild some old beaten up chuck ===> brand new Jacobs chuck.

Not sure that rebuild stuff would fit though on a no name chuck.

 

[Tom Kitta]

Not sure that rebuild stuff would fit though on a no name chuck.

Rebuild is only for same type of chuck - so Jacob chuck say no 34 would have its own rebuild kit.

I just acquired another Jacob chuck and its 6A with an E taper... Yeah, who knew there was an E taper. Its JT E. Bet you did not know about it. They are super rare and feel like they are all before WWI, right after Jacobs started making chucks. Have to post it on machinist FB forum.

 

[jcdammeyer]

Thank you David. Fits perfectly! Almost better than the original.

 

[DavidR8]

Thank you David. Fits perfectly! Almost better than the original.

View attachment 25332

Awesome!
Thanks for the visit!

 

[Dabbler]

I'm glad it worked out!

 

[jcdammeyer]

The MT3-M18 arbor arrived today. I dug out a couple of spare plastic holders since this one came in one too. I'll file them away in a corner where I'll likely forget about them for a few years.

 

[Former Member]

I just switched from a Jacobs style chuck to a keyless one and am impressed. Reason for the switch was simple, chuck came off the jacob taper R8 shank and did damage to it (first time this has ever happened to me, I suspect it was the heat transfer from drilling to break it free).


Replace the arbor with new but added a new chuck, good to have backup just in case.

 

[Tom Kitta]

I just switched from a Jacobs style chuck to a keyless one and am impressed. Reason for the switch was simple, chuck came off the jacob taper R8 shank and did damage to it (first time this has ever happened to me, I suspect it was the heat transfer from drilling to break it free).


Replace the arbor with new but added a new chuck, good to have backup just in case.

If you are going to drill hard you may consider freezing the jacob taper and heating the chuck (or reverse). The mating is a bit ... harder to break (or near impossible).

There are chucks out there with integrated MT shank.

Keyless has its uses - it is nice for casual drilling. It is a chuck that not only hand tightens but also self tightens when the drill starts to slip. Main issues are:
- need a spanner wrench when chuck over tightens - so you are not free of "key"
- cannot reverse drill or reverse a tap etc. As self tightening feature becomes self loosening
- a bit more travel time is needed to change from one size to another.

Note that keyless has been around just few years less then Jacobs. Both are over 100 year old designs.

 

[Dabbler]

I have a keyless chuck for my tail stocks for repetitive changes, but still prefer my keyed chucks. One day I'll just sell of my keyless ones - I don't see any advantage at all.

 

[Former Member]

If you are going to drill hard you may consider freezing the jacob taper and heating the chuck (or reverse). The mating is a bit ... harder to break (or near impossible).

There are chucks out there with integrated MT shank.

Keyless has its uses - it is nice for casual drilling. It is a chuck that not only hand tightens but also self tightens when the drill starts to slip. Main issues are:
- need a spanner wrench when chuck over tightens - so you are not free of "key"
- cannot reverse drill or reverse a tap etc. As self tightening feature becomes self loosening
- a bit more travel time is needed to change from one size to another.

Note that keyless has been around just few years less then Jacobs. Both are over 100 year old designs.

Well that may be, but the good chuck require mounting. The idea of heat and cooling to mount is actually very good and sound. However heat buildup in the chuck will counter that for the same reason and methodology.

Having tried the keyless chuck I am impressed. I find I have less slippage compared to a keyed chuck (even cranked down). I am also impressed with the tolerances (keyless is from Accusize and the keyed is from KBC and German made) the keyless compared to all
my keyed chucks and one true Jacobs, the keyless is way tighter and easier to operate.

IMHO (including research on what machine shops use) it truly becomes a personal preference based on experience.

 

[Tom O]

I have 3 keyless ones for my mill and haven’t had a problem. I did read somewhere that the drill shouldn’t be bottomed out because as it’s tightened it pulls it in more.