Help & advise please… Jacobs #20 super chuck

[GreatOldOne]

Hi all,

I’ve recently lucked into a #20… it’s in great condition, a bit dirty and in need of some new grease after a clean. It’s… large. I can use it, even in my mill (it’s not a Bridgeport or any other big piece of iron, but I have the headroom for it)

Anyway, I have hit the problem that my googling says is standard for these chucks… it’s a JT5 mount. It came with a JT5-MT4 arbor. I need a JT5-R8. I’ve seen that they *do* exist, but appear to be as rare as unicorn poo.

So my questions are:

1. Does anyone know if the correct arbor for my circumstances is available from anywhere now? Most searches I’ve done throw up either distributors or re-sellers that are no longer in business. And if you do know, is anyone willing to help a Brit out by assisting a purchase and shipping (all costs to be stood by me of course). There’s nothing this side of the pond. Period.
2. Failing all that, I could attempt to turn a new arbor myself. Then there’s two options. Either a straight shank for a collet which I guess would be easiest, or try to do an R8 and put a draw bar thread in the tail. Opinions? I do have the MT4 arbor I could use, and try and do some hard turning to get past the hardened surface.

Or am I just better using it as a doorstop or paperweight?

Cheers

Jason

 

[Janderso]

CD Tooling has one. Shars had a JT4 but no 5
$75 plus shipping.
If you can’t buy it, let me know.
PM me, glad to help
Jeff

 

[projectnut]

Here are a couple sources. I didn't attempt to order from anyone so I don't know if they really have them in stock.

R8-5JT DRILL CHUCK ARBOR H & G(GI-862-058) - 556-00405-4

www.a-1supply.com

DRILL CHUCK ARBOR R8 X JT5, Arbors - Engineering Tooling Supplies

www.engtooling.com

 

[GreatOldOne]

Thanks guys. The c&d appears to be in stock and available for shipping to the UK. Shipping is a bit expensive @ $40 - but I guess exotic items from foreign climes demand that sort of outlay.
H&G are out of stock, but ETS has them - I just don’t seem to find a shipping option to the UK. It’s a bit odd. They do ship overseas, but the list of destinations is a weird. Why only those countries I wonder?
I’ll drop ets an email and see what’s what there, and how much they’ll charge.

 

[GreatOldOne]

I finished the majority of the cleaning this evening. It was severely caked in dried up grease. Methylated Spirit got rid of most of it. I need to hit the jaw ways a bit more, but I thing that that is mostly staining.

the residue was a bit nasty - there’s an awful lot of grit there. Yet everything looks in pretty good condition. Even the ball bearings.

 

[GreatOldOne]

Still radio silence from ETS… I even put an order in in the hope that an actual order on the system might buck up the sales team, but no. I guess lockdown in Aus may have done for the office staff…

In the meantime, it’s back together and ready for action once I can get hold of an arbor. Happy how it’s come out:

Family photo. L-R, big daddy 20N, baby 14N & Mummy 16N

 

[Alcap]

Is this the arbor your looking for ? https://www.carbideanddiamondtooling.com/Drill-Chuck-Arbor-R8-to-JT5--ID-640-7-052-805_p_379686.html

 

[Janderso]

Beautiful job on the chuck.
You have to appreciate the high quality of these.
This inspired me to pull out my Jacob’s chucks for a cleaning

 

[682bear]

I need that chuck to go on my big drill press!

Nicely done!

-Bear

 

[GreatOldOne]

Is this the arbor your looking for ? https://www.carbideanddiamondtooling.com/Drill-Chuck-Arbor-R8-to-JT5--ID-640-7-052-805_p_379686.html

Yes, that’s the type I need. I’ll wait a bit to see if ETS comes back to me as they are quite a bit cheaper… but it might come to the point of having to bite the bullet and order from them instead.