[PSUBS-MAILIST] machining q ball

[Jim Rudholm via Personal_Submersibles]

I use billard balls for handles on my lathe fixtures. Try a PVC water pipe
cap mounted in the 3-jaw and machine the inside for a snug fit. Then
tighten a little more. Also add coolant and dress down the drill's cutting
edges with a hand diamond hone to a very narrow flat. This gives more of a
scraping action, works for brass and bronze, too. For handles, its a blind
hole for a 1/2-13 thread.
JimR

On Fri, Oct 17, 2014 at 3:00 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Thanks guys
> Emile,
> I think the hard resin q ball is what Gamma had when it was built.
> Vance,
> That is great, I am thinking the q ball twisted in the jaws causing the
> drill to bind.  I can make a fixture to hold the ball tight without
> damaging it, while it is in the lathe.
> Hank
> --------------------------------------------
> On Fri, 10/17/14, via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>  Subject: Re: [PSUBS-MAILIST] machining q ball
>  To: personal_submersibles at psubs.org
>  Received: Friday, October 17, 2014, 5:44 PM
>
>  Hank,
>  I've sent along some questions to the
>  horse's mouth. Haven't heard from him in months, but
>  I'm hoping he will get back to us shortly.
>
>  Vance
>
>
>
>
>
>
>  -----Original
>  Message-----
>
>  From: hank pronk via Personal_Submersibles
>  <personal_submersibles at psubs.org>
>
>  To: personal_submersibles
>  <personal_submersibles at psubs.org>
>
>  Sent: Fri, Oct 17, 2014 4:37 pm
>
>  Subject: [PSUBS-MAILIST] machining q ball
>
>
>
>
>
>
>
>
>
>  help!
>  I tried to machine a q ball today as an experiment before
>  the proper one
>  arrives.  I put tape around it and put it in a 3 jaw chuck
>  and while drilling
>  the hole through it cracked.  Do I need to make a fixture to
>  hold the q ball
>  steady maybe?  I made a home made o-ring groove cutter and
>  that worked perfect.
>  The q ball is very brittle, but machines very nice.  Any
>  ideas would be
>  appreciated.
>  Hank
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