O'Donnell Jaw sets

[Graham]

Just wondering what thoughts you  all have on these. looking at the pictures on Axi there seems to be three different sized sets and it reads as if they would be used at the same time which cannot be so.

[john taylor]

If you mean this set http://www.axminster.co.uk/axminster-o-donnell-jaw-sets I use them the majority of the time.   There are three sizes as you say the main jaws which screw onto the chuck are the 50mm ones, the other two sets are inserts the you put in one at a time when needed depending on the size of spiggot/recess you want to use.

john

[Graham]

Ahh, they are actually sliding together, that hadn't registered. So are they the same as the ordinary 'C' jaws as in needing a 6 or 7 mm spigot/tenon with a shoulder resting on the front of the jaw - just held further away from the chuck ?

[john taylor]

Ahh, they are actually sliding together, that hadn't registered. So are they the same as the ordinary 'C' jaws as in needing a 6 or 7 mm spigot/tenon with a shoulder resting on the front of the jaw - just held further away from the chuck ?

Yes

The main advantage of them is that they are tapered so allows easier access to the back of the work.

john

[Graham]

Cheers John, think I will have to get a set.

[Paul Hannaby]

Hi Graham,
The O'Donnel jaws have shallower dovetails so your spigot would need to be less than 5mm.

[Graham]

Hi Graham,
The O'Donnel jaws have shallower dovetails so your spigot would need to be less than 5mm.

I am surprised they manage to hold the work securely at that size.

[edbanger]

Graham

I've turned loads of things on the old multistar chucking system where the spigot is only around 4mm deep and you only have a couple of mm to play with in diameter and they hold fine. All you have to do is make sure you turn a clean spigot.

Ed

[Graham]

Thanks for that Ed