3 jaws or 4

[dickm]

Always wondered, and never seen an explanation, why scroll chucks for wood work are always 4-jaw, whereas those for metal are almost always 3-jaw. I vaguely remember reading somewhere that "it is impossible to make an accurate self-centring 4-jaw chuck" but that was with reference to metal turning.

Anyone know the answer?

Apart from the jaws not really being the right shape, I find that the 3-jaw off my Myford metal lathe is OK on the Mystro in an emergency.

 

[Blister]

Arr Yes

Its all to do with the :-

Flue Flue la piffy valve , that's just behind the spod washer , captivated by the dingly dangley thigamegig , devided by the stoichiometric ratio times pie

equals

I haven't a clue

Sorry

but someone clever will be along soon :wink:

 

[TEP]

Hi ****.

I'm only guessing but I don't think it would make any real difference whether you had 3 or 4 jaws, as long as the jaws make a full circle. These scroll chucks are so powerful that when you mount a timber blank it will compress the mounting point so you would never be able to get it truly centred anyway. All due to the nature of the beast with the material we use.

PS - 'as not clever #-o

PPS - I would never use a metal turning chuck on a wood blank any bigger than a small spindle, it just won't hold the work securely.