Re: [CAD_CAM_EDM_DRO] Threads on a ball screw........

it's the interrupted cuts that also create a bit of a problem. again,
with proper insert tooling or lots of hss grinding, the material is
easier to cut after the threads are removed. we use a ccmt 21.51
style/size insert and the smaller radius seems to cut better than some
of the larger triangle/trigon inserts we've tried.

to get a nice, polished finish on the journals, you can leave a thou or
so and spin up your lathe and use sandpaper belts of a desired width.
usually, after 400 grit, your finish will be pretty nice.

hope this helps!

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Steve Blackmore wrote:

>
> On Tue, 23 Feb 2010 16:33:39 -0500, you wrote:
>
> >What is this "sleeve goop" you speak of, something better than
> threadlocker?
> >
> >Those ballscrews ARE nearly impossible to cut down or thread, makes a
> good case for making yourself an inexpensive toolpost grinder. You
> just have to cover your entire machine with plastic so you don't get
> the grinding mess into your ways.
>
> I've turned and threaded ballscrews without any problems? They are only
> usually 4140 or 4150 alloy steel or 1050 Carbon steel. You need to take
> deep roughing cuts to get through the surface hardness with Carbide
> insert tooling. Something like Iscar IC3028 inserts are good for that.
> Once through the surface they are no trouble at all with normal insert
> tooling.
>
> Steve Blackmore
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