Gallery, Projects and General > How to's

Cenerting the Four Jaw

<< < (2/6) > >>

raynerd:
What is the advantage of using the 4 jaw on round bar if centering - just better grip on the work piece? I have a 4 jour, think it is 6 inch for my boxford but have never touched it. I know I will need to some day soon....thanks for the write up darren.

Chris

Darren:
Well in my case I only have a four jaw for this lathe (and 5c collets)

But apart from being able to centre work precisely you can also off centre precisely too as Tinkerer suggested.

You can also hold square or rectangular work which you can't in a 3 jaw chuck.

Andy:
And the more often you use your four jaw, the easier it gets to set up work. I work on a lot of square and rectangular stock - three jaw no good for that.

mklotz:
Darren,

I wasn't implying that you got the technique from me.  I was merely surprised that you had arrived at the same procedure since I've never seen anyone else suggest it.

When you make up your clone wrench, check the clearances at the backside of your chuck.  If things are tight (as they are on my lathe), you may want to make the clone somewhat smaller than the main wrench.

No pictures?!  Perhaps you want to revisit HMEM.  I'd rate it as photo-rich as this site.

Chris,

One reason to mount cylindrical work in the 4J is to guarantee concentricity of the machining with some previously machined feature.  With a 3J, you'll be lucky to be able to hold concentricity to within a few thou.  With the 4J, you're limited only by your DI accuracy and your patience.  And, yes, the 4J has a better grip.

Darren:

--- Quote from: Andy on October 13, 2009, 04:52:15 PM ---And the more often you use your four jaw, the easier it gets to set up work.

--- End quote ---

Only having a four jaw for a couple of years I have to agree with you. I don't have any issues using such.

Navigation

[0] Message Index

[#] Next page

[*] Previous page