130mm independent 4 jaw chuck, does it exist?

So I have been searching the net for a 130mm independent 4 jaw chuck for my Clarke CL500M, plenty of 125mm out there but there doesn't seem to be any 130mm. Just wondered if maybe this isn't a thing?!

Yes Clarke do one specifically for the lathe at £200 which seems a lot. Yes I could make an adapter plate to fit a 125mm chuck, but I'd quite like the diameter to match the headstock (call me anal if you like) 🙄

I found a 130mm 4 jaw self centering chuck but no independent jaw version. Just wondered if anyone knew of somewhere to try that maybe I missed?

Thanks Stuart

The Clarke item includes an adapter plate ... which helps explain the price.

There has been another recent thread discussing this.

MichaelG.

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Ref. https://www.model-engineer.co.uk/forums/postings.asp?th=168889

Edited By Michael Gilligan on 05/01/2021 16:51:25

Surely 5 mm on the OD of a chuck will not affect its' usefulness to any real degree. If there are lots of 125 mm dia chicks and no apparent 130 mm ones at reasonable price I'd suggest getting the 125 mm one and getting on with life. BTW a 4 jaw independent chuck needs to be firmly attached to the spindle of course, but does not need ultra precise location on centre. a few thou runout of the OD of this type of chuck to centre will not matter - you are centring each job using the independent jaws.

Hmm. ..does anything prevent it swinging a 150 (or 160) mm four jaw?

Bison do a 130mm independent but makes the Clarke one seem a bargain

Has anyone measured the 130mm one to check it isn't a 5in one 'converted' by someone in marketing who only thinks in round figures.

5" = 127mm so just 3mm actually.

Stuart

Far more important to worry about jaw size than exact diameter.

Historically 4 jaw chucks, especially in the larger sizes, tend to come in heavy duty and light duty types. Heavy duty types tend to have jaw sizes approaching those of next size up three jaw and light duty ones have jaws more like next size down threes. Heavy duty types have significantly bigger and heavier bodies too.

Heavy duty ones hold workpieces more securely but the bigger jaws can seriously get in the way on smaller jobs. Although the heavy duty / light duty split isn't so specific with chucks of the size you are considering different makes and models have considerable variation. For our sort of work a light duty chuck with its smaller jaws and less massive body is generally better so, other things being equal, go for the one with the samllest jaws.

Some of the inexpensive imports have been terribly cumbersome. Objectively, on a smaller machine like yours, if a job needs heavy duty holding power its better done firmly strapped down to a faceplate.

I have both for my Smart & Brown 1024, admittedly a larger lathe than yours. The heavy duty one comes out about once a decade!

Clive

Thanks Clive, I will bear that in mind. How can you tell the difference when viewing on line? Is there anything in particular that denotes which is which for example?

Thanks Stuart