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Old 18 March 2008, 18:41   #11
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What does a collett chuck do that a 3 jaw doesn't ?

Pete
Ask a watch maker and he will tell you - accuracy and lack of marks!!!
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Old 18 March 2008, 18:46   #12
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Originally Posted by Hightower View Post
Well you don't have to fuff about with concentricity problems as they never arise with a collet system, great for small production jobs..
Yes, and you can bar feed them. A three jaw is for rough work. Collet or 4 jaw for the precision stuff.
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Old 18 March 2008, 19:38   #13
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Been trying to find a 4-Jaw for my big old Colchester for years.

Its an old 3-bolt Flange fitting.
the Machine itself should be in a museam as its an old belt driven jobbie that was powered from the factory roof, now converted to 1/2HP Single phase.

I'm looking to replace it with one of the better quality Lathe-Mill combinations when I've £3K to spare, partly because of space to store two machines.

Andy
Plans for the future coming forward a tad I presume?
Things not working out?

Nasher.
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Old 18 March 2008, 20:13   #14
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There's a shop 200 yards from my house that deals in nothing but this kind of gear. I'll get you his phone number.
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Old 18 March 2008, 20:21   #15
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Andy
Plans for the future coming forward a tad I presume?
Things not working out?

Nasher.
No, things are starting to work out a little better, was my first day in a new job when I saw you guys and didn't have a very good first impression, coupled with the fact my body was still working shifts and I got stuck in traffic on the way home from work. I've spoken to the Production Manager and there is lots of flexibility to expand and "make it my own" workshop.

So lots happier
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Old 18 March 2008, 20:23   #16
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There's a shop 200 yards from my house that deals in nothing but this kind of gear. I'll get you his phone number.
Thanks Matt.
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Old 18 March 2008, 21:06   #17
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Originally Posted by Hightower View Post
Well you don't have to fuff about with concentricity problems as they never arise with a collet system, great for small production jobs..

You can get as standard equipment “soft jaws” for most three jaw chucks which give you the option to bore them out to suit the exact work piece diameter thus ensuring precision concentricity. This also gives lots of contact area grip on the work-piece diameter and less chance of marking any high quality finish that is being griped.

Sets of collects can be found on smaller centre lathes, Harrison and super sevens to name two.
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Old 19 March 2008, 15:19   #18
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You can get as standard equipment “soft jaws” for most three jaw chucks which give you the option to bore them out to suit the exact work piece diameter thus ensuring precision concentricity. This also gives lots of contact area grip on the work-piece diameter and less chance of marking any high quality finish that is being griped.

Sets of collects can be found on smaller centre lathes, Harrison and super sevens to name two.

Yes, thank you. I am a fully indentured Fitter Turner by trade but only ever saw a collet chuck being used on a centre lathe once, much more common on Capstan and turret lathes or CNC ones normally fitted with bar feeds.
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Old 21 March 2008, 18:00   #19
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Old 22 March 2008, 06:26   #20
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I read some reviews that claim the combo machines can suffer rigidity problems on the mill. Having said that I'll still probably end up getting one.

Quote:
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I'm looking to replace it with one of the better quality Lathe-Mill combinations when I've £3K to spare, partly because of space to store two machines.
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