Thread: Wanted 3 Jaw Chuck for Hercus 9"

Hi everyone..

Ive recently bought a Hercus 9" Model C . It came with a 3 Jaw chuck but only with the reverse set of Jaws..

Can someone advise of a part number, Model of 3 Jaw Chuck I can buy for this model

Thanks in advance

Phil

Is there a brand name on the chuck? New jaws may be available for it.

Re new chuck. If your unable to do the thread and diameter measurements just take the chuck to Hare and Forbes and they will help you out with it.

Look up Mick Moyle, Summer Hill, Sydney - they have some used chuck jaws.

If you cannot find a set of replacement jaws for your existing chuck you will probably have to buy a chuck designed for backplate mounting e.g.
Lathe Chuck - 3 Jaw - Backplate | For Sale Sydney Brisbane Melbourne Perth | Buy Workshop Equipment & Machinery online at machineryhouse.com.au
and make or buy a backplate to suit, then fit the chuck to that. Do you have much lathe experience? if so, since you already have a chuck with the reverse jaws, you could make one yourself. It is not a difficult job, but might be beyond the skills range of a beginner. Otherwise you will probably have to get one made, so will need to measure whether you have the 1 3/8 or 1/1/2 inch diameter headstock spindle thread. Whoever makes the backplate will probably need to have the chuck too so he can fit the backplate to it.

The chucks shown in the Hare and Forbes link are of Chinese manufacture and are at the bottom end of the price scale.. Generally speaking the cheaper Chinese chucks (like these) are variable in quality, some may be quite OK, others of the same make and model may have faults which make them almost useless. I am not pointing the finger at H & F, this applies to all chucks in this price range as far as I know. Better chucks manufactured in Europe are available but are much more expensive. I have two cheap Chinese chucks. The quality of the 4 jaw 160mm one is not wonderful but is acceptable, the 100 mm 3 jaw is very marginal, and another 4 jaw of unknown origin (but very cheap from a closing down sale) was virtually useless because of manufacturing faults, so the cheapies are a bit of a lottery.

Frank.

Chuck1.jpgchuck2.jpgchuck3.jpglathe serial number.jpg

Looks to be a decent English Chuck.

Not sure if I can buy a set for this in Oz or if I need to buy direct from the UK mob ?

Whats the secret to removing these chucks ?

Originally Posted by franco

If you cannot find a set of replacement jaws for your existing chuck you will probably have to buy a chuck designed for backplate mounting e.g.
Lathe Chuck - 3 Jaw - Backplate | For Sale Sydney Brisbane Melbourne Perth | Buy Workshop Equipment & Machinery online at machineryhouse.com.au
and make or buy a backplate to suit, then fit the chuck to that. Do you have much lathe experience? if so, since you already have a chuck with the reverse jaws, you could make one yourself. It is not a difficult job, but might be beyond the skills range of a beginner. Otherwise you will probably have to get one made, so will need to measure whether you have the 1 3/8 or 1/1/2 inch diameter headstock spindle thread. Whoever makes the backplate will probably need to have the chuck too so he can fit the backplate to it.



The chucks shown in the Hare and Forbes link are of Chinese manufacture and are at the bottom end of the price scale.. Generally speaking the cheaper Chinese chucks (like these) are variable in quality, some may be quite OK, others of the same make and model may have faults which make them almost useless. I am not pointing the finger at H & F, this applies to all chucks in this price range as far as I know. Better chucks manufactured in Europe are available but are much more expensive. I have two cheap Chinese chucks. The quality of the 4 jaw 160mm one is not wonderful but is acceptable, the 100 mm 3 jaw is very marginal, and another 4 jaw of unknown origin (but very cheap from a closing down sale) was virtually useless because of manufacturing faults, so the cheapies are a bit of a lottery.

Frank.

Well I did a 4 year apprenticship on the tools (through all the workshops including toolroom and machine shops) on my way to becoming a Mech Engineer, many moons ago, so capable, but rusty...

It came with a 4 Jaw on a post so looks like you secure the 4 jaw in the 3 Jaw.... A faceplate would be good for what I want to play with (small parts for motorbike builds)... 1st preference is to get a set of jaws to fit the decent English 3 Jaw it came with.... I guess..

oggy, as mentioned in your other post, Mal may be able to help you out. He has a good range of Hercus parts and chucks etc

Australian Metalworking Hobbyist

Ken

The chuck will screw off the spindle, it is a r/h thread.

You may/ will need to lock the spindle to remove the chuck, normally this is done by putting the spindle in back gear and giving the chuck a hit on the jaws or the chuck key a hit with a bit of timber or similar, you will quickly tell if it won't release and some other mechanical method will be required.

Worst case you may end up breaking some gear teeth, not a problem as spares or repairs are readily available.

If you go down the jaw route you may find it cheaper to buy either a new chuck,2nd hand with both sets of jaws or a 2nd hand chuck with xternal jaws and swap them over.

What did you mean with the 4 jaw on a pole.

Sorry. I was rushing a bit last night. The 4 jaw is bolted onto a flanged shaft so you clamp the shaft into the 3 jaw.


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I bought a genuine set of jaws for a Burnard chuck many years ago. Let's just say that it would have been cheaper to buy a new Chinese chuck complete. That brand is owned by 600 Machinery now.

Michael

That chuck that you show is not suitable in my opinion for metal work, it would probably be okay for wood work.

I would suggest that you also get yourself either a new or used 4 jaw metal work chuck.

If you get your self either of the chucks new you will probably need to use a back plate to mount them, if you can buy used you maybe able to get them with the 1 1/2" x 8 TPI thread integrated into the body, the latter would be preferred as the overall size of the chuck will be smaller.

That 4 jaw chuck looks to be a fairly light duty version. I remember seeing similar ones advertised for woodworking a few years ago. What diameter is the mounting shaft, and does it have a reasonably sized through hole? If not the length of workpiece held in the chuck is limited to the depth of the chuck. The inability to feed a long workpiece through the hollow headstock spindle will be seriously inconvenient for probably the majority of jobs a general purpose lathe is used for. I suspect it won't be long before you might be looking for a conventional 4 jaw too.

Frank.

Edit: Pipeclay posted while I was typing the above

Perhaps wait until you get yer-self a shaper and a pentograph. Then you can make all the chuck jaws ya want: https://m.youtube.com/watch?v=MYI1slVGziU