[SEL] Introducing........

[Elden DuRand]

Jim:

Thanks!  Now I can go out and earn the big bucks.  It's the American Way (or, at least it used to be).

Take care - Elden
http://www.oldengine.org/members/durand 

> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com
> [mailto:sel-bounces at lists.stationary-engine.com]On
>  Behalf Of Jim Kirkes
> Sent: Thursday, October 08, 2009 09:44 AM
> To: The SEL email discussion list
> Subject: Re: [SEL] Introducing........
> 
> 
> OK here is how it is done, machine accurate angles, amaze 
> your friends and earn big bucks.
> 
> If you have a protractor scribe the angle you want about 
> where the top of the vise jaws will be when you 
> machine the 
> part.  Put the part in the vise and
> pinch it on the scribe line.  Tighten the vise so 
> that you 
> can still move the part with a soft hammer.  If you have 
> done this fairly accurately it helps to set one 
> end (doesn't 
> matter which) slightly high so you know which why it will 
> need to move to be on the nut.
> 
> Now get out your trig tables and look up the 
> tangent of the 
> angle you want to machine.  In Eldon's case  .1989 for 11 
> deg 15 minutes.  Now put your indicator on the 
> head of the 
> mill.  I prefer a drill chuck but any way it is 
> solid will 
> work.  Use an indicator that read in  .001 
> increments.  Now 
> contact the indicator to the work and adjust it 
> till reads 
> zero.  Drop the knee an amount equal to the 
> tangent or .199 
> (rounded off here) without touching the indicator
> move 1 inch.  If the indicator reads zero you have the 
> angle, if it doesn't tap it slightly to correct 
> the position 
> and repeat the process until it reads zero for
> both ends.  The accuracy can be enhanced by working the 
> baseline over a longer distance.  For instance if 
> you use 3 
> inches the tangent will have to multiplied by 3.
> 
> If this is done with care you can easily machine 
> an angle to 
> several minutes of arc provided there is an 
> accurate surface 
> to reference to.
> 
> Jim and Diane Kirkes
> Hemet, California U.S.A.
> jd.kirkes at verizon.net>
> 
> 
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