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Fergus OMore:
It's getting worse! You are using silver steel which requires a different treatment to mild steel.

Your book of words suggests that you use Garia H and a razor sharp tool. Again Thomas emphasises rigidity and problems of overhangs.

DaveH:
Wong,

This is a hobby mate, something we do to enjoy just doing it. :)

Don't get overly concerned, when things don't go the way you think (and know) they should. :bang:

If it is not a critical size, "hit it" with some emery cloth, until it looks good. It is fine we all tend to do it. Then carry on with the next part. :)

It's coming along just fine :thumbup:

:beer:
DaveH

wongster:
Thanks Dave. You are right. I should just enjoy myself and pick things up along the way as I do more. It is a hobby. I did use sandpaper to smooth of the surface. Wonder how you know I cheated... Hehehe...

Norman, I don't understand the use of the term "it's getting worst". What's getting worst? It cant be as bad as the part i just scrapped. I'm trying slowly to digest the info on that book. The style of writing is not that easy for a non-tech person like me. Anyway, the silver steel was originally part of the kit I bought from Hemingway. I merely replaced it with another section meant for the 2 adjustments screws. You mentioned about "the right size" for the ER32 collet chuck. May I know what's the max I should put in there. I've collets all the way up to 19mm.

Regards,
Wong

DaveH:
Wong,

For a given collet size 25% increase in diameter in metal size(dia) outside the of the diameter being held in the collet is normally fine.

Eg. if your collet size is 16mm - then + 25% = 4mm. So 16 + 4 = 20mm diameter. So you can hold the 16mm diameter in the collet with a 20mm diameter outside, the bit you are cutting.

These ER collets were designed to hold end mills in milling machines, the forces there are far in excess that a single point tool on a lathe produces.

:beer:
DaveH

wongster:
Hi Dave,

I read somewhere (can recall now) that each collet in the ER series can hold down to about 1mm smaller in diameter. That is, if I'm putting in a rod or an endmill, of diameter 3/8" (which I've a few endmills or slot drill from sherline with such shank size), I should be using 10mm collet but not 9mm. Do correct me if I'm wrong. So for the 1/2" diameter silver steel rod from the Hemingway kit, I was using the 13mm collet.

Would your last sentence about the forces mean that it is not suitable for workholding in the lathe? If it is, I'll start practising on using the 4 jaw chuck... The small sherline 4 jaw seems simple to use but not the 100mm 4 jaw chuck from proxxon.

Regards,
Wong

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