You could do it as a glue up, using paper as a release between the
quarters. Turn to 6" and separate along the paper.
Fasten 4 pieces together with screws at each end, outside the area to be
turned. Trim the unturned ends off. (Note: I have never tried this but
it should work.)
Make a split turning --- Glue up 4 pieces of 3"x3" stock (or slightly
over sized). Glue paper between the joints. This will act as a
separator. Turn a 6" cylinder and split the four quadrants along the
paper seams with a tap of a chisel. It's done frequently.
Now THAT's what I'm talking about. Thanks to you two for bringing it
to my attention. I'm not a turner, but I have heard of it. I'll
definitely relay the message to our lathe guy. I'm a little surprised
he hasn't thought of it. He does turnings for us from home. Is there
another use for this trick that I would have used myself, but not
involving a lathe? For some reason I vaguely remember knocking apart
some pieces that had been glued up in this manner.
Just called him. He said "oh I know that" and seemed to think it
wouldn't work. The typical way we make large turning blanks is to glue
four pieces of thick stock into long square tubing using 45d miters.
So it's hollow in the middle. I don't know, he was pretty dismissive.
In any event, if I want to hop on the lathe at work (after I dig it out
from under two tons of crap), is this the process by which I should do
I need (4) three foot lengths of quarter round with a 3" radius. So I
take (4) 3 foot lengths of 3.125"x3.125" stock and glue them together
with a piece of grocery bag in between. Then I screw on a faceplate,
being sure that it's centered on the intersection of all four pieces.
Then I mount it on the lathe, and align the interesection at the other
end with the tailstock center. Then I turn it round to 6". Once done,
I simply take it off the lathe and split it apart - I'm assuming with a
chisel pounded into the glue joints?
Sounds very nifty. Have I missed anything?
I think the *first* step in your process should be to crosspost this thread to
rec.crafts.woodturning . You're likely to get more ideas from the folks over
there, and probably better ones than you're going to read in my post...
OK so far, AFAIK...
.. but I don't think I'd do that...
.. owing largely to the difficulty of being sure that it's centered. If it's
not centered *exactly*, you're not going to have quarter-round when you
separate the pieces.
My first thought is to grip it in a four-jaw self-centering chuck. If you
don't have one that opens wide enough, use stock an inch or so longer than
needed, and mill a stub tenon on one end, small enough to grip in whatever
chuck you do have.
Or you could use a steb center in the headstock. (Yes, that's spelled
correctly.) Probably work better than a spur center.
Sounds ok to me... but I've only *read* about doing this. Never actually did
it. Ask over at r.c.w .
Doug Miller (alphageek at milmac dot com)
Not a face plate, use centers, but otherwise, okay. Tell your lathe guy
there is no reason for it "not" to work unless he cannot get the centers in
the right place. The intersection is hard to miss though. This is one of
those cases where "we have always done it that way" because it works :-)
God bless and safe turning
Truro, NS, Canada
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