[PSUBS-MAILIST] cue ball arm

[hank pronk via Personal_Submersibles]

Alan,
The name cue ball arm is misleading a bit.  The arm uses a snooker ball regulation size 2 1/8 +- .oo5 in.  I see no need to improve the outer seat, it has only one purpose, that is to keep the ball in place.  The ball cracked when I drilled it because I was not experienced in machining this material.  I have since machined a perfect hole with o-ring groove.  The trick is to increase the drill size very gradually until a cutter fits in the hole.  If it cracked while in plase it would be pushed together tight by the shape of the seat.
Hank--------------------------------------------
On Sat, 11/29/14, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] cue ball arm
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Saturday, November 29, 2014, 2:29 PM
 
 Looks like
 you have a lot of angle there Hank.Maybe you
 could use a spare pool ball & abrasive paste to get a
 perfect seat for it?You said
 that one pool ball cracked while drilling. I hope
 the pool ball can't push through if it breaks
 up.The size
 pool ball you are using is a children's
 size. 
 I wonder
 if you went to an adult size ball whether it would
 be constructed of a better material?Alan
     
    From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org>
 
 To:
 personal_submersibles at psubs.org 
  Sent: Sunday, November
 30, 2014 7:51 AM
  Subject:
 [PSUBS-MAILIST] cue ball arm
   
 
 Alan,
 Have a look at my cue
 ball arm assembly at Gamma restoration.  I repaired the
 original seat for the cue ball.  After Hugh said to forget
 about making a curved seat, I realized I could make my own
 seat on a 45 degree angle.  I made the second half of the
 assembly with a home made plastic seat machined from ABS. 
 I installed it in Gamma and it turns smooth as glass and has
 the original amount of range.  With home made plastic
 seats, it is a breeze to make this because the o-ring still
 does the sealing.  
 Now I just need the
 plans and my new cue ball to finish the arm.  
 Vance, 
 I was thinking about
 mounting an air cylinder horizontal inside the sub to pull
 on the block and tackle cable.  The deeper I go the more
 air pressure I add, it will be like an adjustable spring.
 Hank
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