Gallery, Projects and General > How to's
Cenerting the Four Jaw
bogstandard:
I think I am a little like youself Nick.
A absolutely hate four jaw work with a vengance, and will use any other method available to me if the opportunity arises. I tend to favour a Keats angle plate or clamping to the faceplate.
I know some people love to use them, but for me, it is like trying to wear a barbed wire thong, a real PITA.
Unfortunately, sometimes a four jaw independent has to be used. Then it is a matter of me gritting my teeth, and getting the pain over and done with as quickly as possible.
I honestly don't know why, as I have never had any real bad experiences with them, just one of those things. I think everyone has at least one pet hate that they don't like doing when working in the shop.
John
Darren:
--- Quote from: bogstandard on November 25, 2009, 06:22:33 AM ---
I think everyone has at least one pet hate that they don't like doing when working in the shop.
John
--- End quote ---
For me it used to be parting, till I went carbide ....
Four jaw, I actually prefer it over 3 jaw. But if I could get a runout of 0.001 like Nick that could quickly change ... :dremel:
NickG:
On my hot air engine before I got the new lathe I used a 4 jaw twice. I turned a square aluminium column and made the crank from 1 piece by offsetting. They both worked, but it was a PITA to get the offset, it just didn't work the way I thought it would!
But now, I would probably make a round split bush for the square aluminium - would probably grip ok with light cuts and I made a split bush to offset my crank on the rocking engine.
Like you John, I don't know why I am that anti-4jaw, I should use things like that as an opportunity to practice really.
Darren, parting is another one of mine - Cast iron, aluminium and brass I like doing - but steels my lathe doesn't seem to like much and I end up sawing!
I think I must have got lucky with my chuck, either that or I measured the run out incorrectly!
Nick
Darren:
Nick, much the same here with parting .... try a carbide parting tool and you won't look back. I can now part steel at high rpm like it's butter.
NickG:
Darren, I might just have to try that!
:offtopic: I have also asked for a set of carbide tipped tools for Christmas too so I can try them. Are the little sets you get (brazed top not indexable) all the same centre height? You can see my thinking - then I'd be able to have all the same packing pieces - or make 1 packing piece the right thickness to give me centre heigh, until i make or buy a QCTP!
Nick
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