Also nice for holding thin wall tube

In a nutshell light duty, high precision work holding. A bit like an adjustable collet really.

And apparently if you take out two opposite jaws you can use it like a less powerful 4-jaw…can save changing heavy chucks for a quicky type job.

I have a Pratt one just over 4" dia which I cadged when we were having a full refurb of our Brierly ZB32 Drill grinder.

As Adam says its grinding where they come into their own, in particular grip spreading on spiral fluted cutters.

Mine goes down to gripping a tad under 2mm in diameter and is really true considerering it's past life. Not really worth the cost for normal jobbing type operations at their new prices. Reckon mose people was just opt for good collet setup.

£128 (inc. postage) for an almost new 6" Buck Tru-Grip chuck from our favourite auction site seemed like good value to me.

Dave
The Emerald Isle

You won't find it John because it was about 2 years ago.

It was badly advertised and there were no other bids Said it was for a Hardinge lathe so all I had to do was change the backplate for my lathe.

Dave
The Emerald Isle

.

Right OK got it.

Bit like that new Mini van I bought in 1968 for £440 then ?

That was brand new Steve but the cheapest I could get. Because it was classed as a commercial vehicle you could get £20 knocked off for buying it in primer and in those days it only cost £3 for enough paint to do a Mini.

Plus at that time road tax was £25 but if you taxed it goods it fell into the lower class and only cost £24