Expansion Chuck Help

[edbanger]

Does anyone know where I can get an expansion chuck not sure that I'm calling it by it's correct name.

I've seen someone using an old one, but I can't seem to find them online so it might be called something else.

It's use was in turning burr's you drill a hole down into the burr the chuck body which is a cylinder is inserted into the hole and tighten which expands it thus gripping the burr so it can be safely mounted on the lathe.

Hope that makes scene.

Thanks

Ed

[Mark Hancock]

It sounds like you are referring to a the variation of the pin chuck that came out many years ago.

The pin chuck http://www.peterchild.co.uk/chucks/pinchuck.htm was designed for using with natural top vessels. The variation had 4 "wings" that splayed out to tighten rather than using the pin.

I never found it that good at holding, particularly with wet timber. As things move on IMHO there are better ways of dealing with the issue of holding on an uneven surface such as between centre, screw chuck etc.

[Bryan Milham]

Ed,

you are talking about a Scroll Chuck.

Look up the Supernova2 (or 3) or the Vicmark, or the Axminster Super precision,

They all come with C Jaws, but they can be changed for various other jaw sates inluding deep hole Grippers.

[Richard Stapley]

Ed you are probably thinking of the Mini Gripper which was originally from Craft Supplies in the USA and I also think Craft Supplies in the UK also sold it.

I was asked about this a couple of weeks back as I have a picture of one I modified on my Web Site and trolled the Web but could not find a seller anywhere.

Richard
http://www.laymar-crafts.co.uk

[Bryan Milham]

Richard,

I've regularly visited your site, never realised it was you in this forum, excellent resource, thank you for it.

[Andy Coates]

I'm with Mark. A pin chuck.

[The Bowler Hatted Turner]

Now you see I can remember a type of chuck that was inserted into a hole and then when tightened it drew a wedge up the centre so wedging the whole thing open. Can't for the life of me remember what they were called though, might even still have it in one of the dark unihabitable corners of the workshop.

[edbanger]

Hi Guys thanks for the help.

Mark I mount smaller burr's this way, but my Axminster will only accept 16" over the bed, and I'm looking to turn much larger burr's that this.

The pin chuck look's like it will do the job I'll phone Peter Child's and ask what sort of weight you can mount on the pin chuck, and I'll take a look at the deep gripper and find out if that will fit my Patriot, that might also work.

Bowler that's the thing I was looking for, they came in different lengths and diameters,  if the name come's back to you please let me know.

Ed

[TWiG]

If you are looking to be turning burrs in excess of 16" with their inevitable unbalanced weight then you should really be using a face plate in my opinion .

[edbanger]

Hi TWIG

I'm with you and that's the way I was going to do it but then I saw this bedded chuck the guy had, had for years he didn't know where he got it or what it was called, so I thought I would investigate because if you could get it large enough that would take the weight of 30kg plus it might be a stronger and better hold.

Ed 

[The Bowler Hatted Turner]

ED having used that chuck in the past I agree with twig that the safest way is to use a faceplate. The beauty of that method is you can hot glue wedges onto the burr to "throw" it to get the best out of the piece. Using other methods, and especially the pin chuck, you cannot readily do this.

[edbanger]

Thank's Bowler - didn't think of gluing on pieces that's a great idea get the faceplate level make sure the screws are long enough to go through the packing pieces and secure in to the burr its self job done.

Ed

[bodrighywood]

Some of the odd shaped pieces I use I do as John said using wedges and hot glue. Only downside I have come across using this method has been picking the glue out of the crevices etc afterwards LOL. Make sure the glue is running liquid before applying though to make sure it is good and hot.

Pete

[edbanger]

Thanks Pete I'll get some tooth picks