In article
,
"B.B." u wrote:

For class I'm turning an aluminum flywheel. 3" diameter. The steps
a face the sides, drill & ream the center, press onto a mandrel, turn
the outside and sides. Anyway, after pressing it onto the mandrel (yes,
I cleaned out the cutting oil) I've found that I have to go very slowly
or the cutting tool will grab the wheel and spin it on the mandrel.
What are some good ways to deal with this problem? I already crammed
it as far onto the mandrel as I'm comfortable with. I'm tempted to just
loctite the damn thing.

Replying to all:

I like the method jim described since it's sturdy, but I can't use it
since I've already done just about all of it except for turning the
grooves in the sides. Of course, if I ruin it.... However, I believe
we're doing this part mostly for the sake of turning something between
centers as part of the class. I'm nearly done with the assigned project
and have a half a semester to go for whatever, so I can probably try
this at some point.
Harold, When you wrote "Can I assume the mandrel is ½?" that last
character came out as Pi on my screen, and I have no idea what you meant
by it. But, bar stock, pressed the mandrel in with an arbor press.
We're using general-purpose indexable carbide tools on all of the
lathes, but I have a fresh bit of tool steel and I'll see about making
my own tool to play with. I did find (counter-intuitively) that running
on the high side of the cutting speeds helped.
I'll likely settle on the heat & press method suggested by
PrecisionMachinist. Class is on monday--I'll let you know how it goes.

--
B.B. --I am not a goat! thegoat4 at airmail dot net
http://web2.airmail.net/thegoat4/