Between centres

[John HewesParticipant @johnhewes50816]

With a job between centres, using a catchplate to revolve the job, how can I turn to the left end, as the driving dog is there, isn't it?

Thanks, John

[John HewesParticipant @johnhewes50816]

[jason udallParticipant @jasonudall57142]

Well..the point is between centers you can remove and re start the work repeatedly. ..thus you remove job..move drive dog as required . Then carry on. ..
But cafeful planning of work flow helps…

[NobbyParticipant @nobby]

Hi John
Can you turn the job round .? you can protect the turned end with a peice of ally or brass under the driving dog
Nobby

[Ady1Participant @ady1]

Or rig up a centre drive arrangement

Proper ones can be pricey

[Les Jones 1Participant @lesjones1]

Hi John,
You may be able to start with a slightly longer piece of material and cut this off later. It would depend on the thing you are making weather this method could be used.

Les.

[Gray62Participant @gray62]

There's a good description here by frank ford of a driving centre he made. I've got a couple like this in different sizes and they work extremely well.

[IanTParticipant @iant]

I seem to remember bolting sacrificial pieces on both ends of some work and then drilling centres into the bolt heads. I was then able to turn the main work piece (and reverse it as required) and I managed to get all the surfaces I wanted true to each other. The drive dog was fitted to the extension bits out of the way of the cutting tool.

The only problem is that I really cannot remember why I did this now (as Nobby's way should work just fine) only that I had some kind of problem doing it the 'easy' way. I clearly wasn't bothered that I had screw holes in the work ends either. You have to do all the work you want concentric before you remove the centre extensions, as you won't get them back central again.

Funny thing memory. Some work I can remember just about every detail of it, other bits I have to think hard about why I even made them, let alone how.

IanT

[Tony Pratt 1Participant @tonypratt1]

Turning the job around or making it over length has got to be the way to go.

Tony

[John HewesParticipant @johnhewes50816]

Thanks, all.

I don't like the idea of turning it around, and favour the overlong and cut if off later approach, I think. I will try it when I need to, thanks again

John

[Tony Pratt 1Participant @tonypratt1]

Turning the job around is an industry accepted method of machining both turned and precision ground components and will give excellent results if care is taken to ensure the centres are clean and properly lubricated on each set up. Of course your favoured choice will give good results, I hope it goes ok.

Tony

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