Far more support to the workpiece. More jaw less gap. Collets are better still.

regards Martin

When I was on the handles we only used 4 jaw chucks for big work where large depth of cut/high feed was used, 3 jaw chucks were occasionally used for light work and capstans for round and hex repetition stuff. The 120" chuck on the Webster & Bennett vertical borer that they had only used 4 jaws or the chuck was used as a faceplate.

I can't remember seeing 6 jaws in the UK workshops I've been in and as Hopper says they are only really any use for good symetrical stock if they work on the scroll mechanism that most 3 jaw chucks have.

Edited By Henry Brown on 23/03/2023 10:52:39

Our mechanical workshop has several. They are particularly useful for reducing distortion when holding bored out components with thin walls. Chuck a bit of tube in a 3 jaw and bore it. When it comes off the machine the bore will be trilobite to a degree.

regards Martin

I thought that was exactly what I said?

regards Martin

Not only that but an educated one too. I obviously meant Tri-lobate. Blasted auto correct , at it again.

😵‍💫

Without going into the pro's n con's you find on youtube on creator fits a 6 jaw chuck then other do bit like when someone put a steering wheel on their mill everyone got on the band wagon

H

Rotagrip lists them as a drill grinding chuck.

The six jaw chucks intended for holding drills have very thin teeth as they are then able to grip smaller drills. The type with conventional jaws work well with thin wall tubes as already mentioned, quicker than machining special soft jaws to reduce the distortion with a three jaw chuck. The cheap six jawed chucks only have internal jaws, and the high end ones with both sets cost an arm and a leg, one reason why I have never bought one. They can suffer the same shortcomings as self centralising four jaw chucks, if the workpiece is a perfect cylinder, the clamping will vary and if the workpiece is not a perfect cylinder the same happens, something not present in a three jaw chuck.

Thanks Old Mart,

Now I know what the very slim set of jaws are for. It had puzzled me for years!

Andrew.

Cutwel used to list an eight jaw chuck on their website.

Does anyone have/use a 2-jaw chuck..?

He seems to do a lot of high precision small parts where minimising the distortion of the part is key, so it figures…

I get the distinct impression that he's not so much a "YouTube Creator" so much as some guy who is really passionate about precision manufacturing filming things he does aas part of running his business that he finds too interesting not to share, and has got popular for exactly that reason.

My interpretation is that it's actually the grip-tru backplate which he finds useful on that chuck as it allows him to apply minimum required clamping pressure with the chuck then dial things for concentricity in by adjusting the chuck position on the backplate.