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Jacobs chuck

C

Chris152

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The Jacobs chuck that came with our Myford lathe is in pretty poor condition - I've tried to sort it and failed. Actually, it's a fair bit worse after today's efforts.

It's a No. 34 0-1/2" chuck on MT2 and I'd like to replace it with a similar size one but not pay a huge amount - can anyone recommend a reasonably priced but decent quality replacement?

Thanks, Chris
 
I would want to buy a quality drill chuck, the main reason being accuracy, and it's one of those things you use very often and will have for your entire life if you look after it so it's worth buying something that's easy to work with.

The cheaper ones from China or India are OK but they often don't operate smoothly and quality can be hit and miss, and often the cheaper chucks will only grip 3mm as a minimum size, where a good quality chuck will close to almost nothing. They're usually fine for woodturners and imprecise work but if you want to drill precision holes you really need a precisely made chuck from the likes of Jacobs, Rohm, or if you're feeling flush, Albrecht.

You can often pick up a decent quality secondhand chuck on eBay for around £25 and up depending on condition. Some won't have MT2 arbours on and may require one purchased separately to suit the mounting on the chuck whether that's Jacobs Taper or thread-on.
 
Thanks for that Dan. Having sorted some new drills, we got frustrated with the malfunctioning chuck - little point having the one and not the other. So yes, something that works and continues to work sounds a smart move. I'd not heard of Rohm or Albrecht, I'll take a look.
 
I believe the new Jacobs are another Chinese delight.......

will be doing the same *upgrading* when I can.......
will be going for the German jobbie.....used of course...

I would like a new chuck on my corded Hitachi angle drill.....nobody here to repair it.....
cant get it off..tried everything I know inc the biggest Allen key and wacking it with a hammer......
scared I will damage the gears...screw removed from the center.....
Just might not bother as Lidils have an 20v angle drill on the way......
for what I use it will be ok....only small stuff.....
 
I don't have a lathe but I do use a Rohm keyless chuck on my pillar drill, with an MT2 adapter (unusually, the Rohm has a female thread at the back). It's excellent, although I have bigger Jacobs-style chucks for the serious-sized holes.

Have a look at what Chronos have on offer presently. They also do any MT2 adapter you're likely to need.

E.

PS: I was surprised to notice t'other day that Adam Booth ("Abom79" on YouTube) has a keyless tailstock chuck on his new "Precision Matthews" metalworking lathe (I _think_ it's American, but possibly a Chinese import to the USA). All the rest of his ones are keyed, and mostly genuine Jacobs. The keyless one doesn't seem to cause a problem, even with large drills - he often uses massive things, preparatory to taking the hole to finished size with a boring bar.

Have you cast about for a s/h Jacobs? The older, industrial-quality ones can be fairly easily stripped and cleaned (but you might need a press).
 
Thanks Eric. I've been looking at used Jacobs, they seem to go for about the same price as cheap new ones from China so may go that way. In the meantime, I ordered one of these:
https://www.ebay.co.uk/itm/313434294361
I couldn't resist at the price and it may do the job with the right adapter (it's a screw fit) and some Loctite. If it's not concentric, we'll have it there for future use.
 
If you buy a second hand Jacob's, don't be put off by a wrong sized arbor, it can be removed easily by drilling a hole about 4mm through the bottom of the chuck, inserting a nail or something and giving it a whack. It's easily done, the bottom of the chuck is dished so the drill will self centre.
 
I've tried driving it out from the jaws end on the old one Phil (I wanted to re-use the arbor), no joy even after heating with a blow torch, then heating and immersing the arbor in ice water, nothing seems to work!
 
I presume you drilled it?

Place the bottom of the chuck on the jaws of a hefty vice with the arbor unsupported and use a lump hammer on a nail/pin of some description.
 
It was already drilled, I managed to bend a fairly substantial drift/ punch thing using a lump hammer trying to get it out! I think it's just determined to stay where it is. And no, it's not threaded :-)
 
Chris152":turl46dc said:
It was already drilled, I managed to bend a fairly substantial drift/ punch thing using a lump hammer trying to get it out! I think it's just determined to stay where it is. And no, it's not threaded :-)
Click to expand...
Try holding the tang in some soft jaws, and giving the chuck a firm twist (anticlockwise, just in case it’s threaded!) with a punch through one of the chuck key holes.

If no go, make up some opposing wedges to go under the lip of the arbour nearest the chuck. Works a treat.
 
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