Axminster Eccentric Chuck

[Glynne]

I inherited an Axminster Eccentric Chuck and have just got around to trying to use it.
Unlike the current one on the Axminster site http://www.axminster.co.uk/axminster-eccentric-spiralling-chuck-900093, my chuck which is over 10 years old only has the metal eccentric ring and an alloy plate - there is no indexing "faceplate" that fits onto the alloy.

From the packaging there doesn't seem to be anything missing so I'm wondering how I use this as the only YouTube video I've found shows moving the indexed faceplate (which I don't have).
Strangely, the instructions I have are identical to the ones on the Axminster site although I'm struggling to understand the instructions.
Any help would be gratefully appreciated.

 

[Paul Hannaby]

Hi Glynne,
What you have there is the eccentric chuck. the other bit you see on the new one used to be sold separately as a spiralling adapter but now the whole thing is sold as a single unit.
To use the bit you have, you can mount a piece of wood on it (using the three screw holes in the plate) and you can also use a centre screw or plug so you can release the holding screws and rotate the piece of wood. You can make up your own indexing with a little improvisation.
The line of tapped screw holes are the offset holes, you can slacken the two screws holding the plate to the ring and use a different offset hole to move the plate (and attached bit of wood) off centre.
The advantage of the spiralling adapter is that it has 12 point indexing to make it easier to rotate the workpiece for spiralling or other multi-faceted eccentric work.

I have one of the old versions of this which have the bits you have and also the spiralling adapter so it gives the best of both worlds.

 

[Glynne]

Thanks Paul.
So I really need to mount either my workpiece or a sacrificial piece to the plate leaving enough room to access the screws so as to be able to move the outer ring? I think I may put the full face visor on when trying it out - no wonder they improved the design.
Cheers.

 

[Paul Hannaby]

Yes, you need to be able to get to the screws to change the offset so I guess that limits you to around 3" diameter. However, there's nothing to stop you removing the wood from the plate, changing the offset and screwing it back on - as long as you can re-attach it in the same place.