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Re: [Amps] Proof of idiocy

To: amps@contesting.com
Subject: Re: [Amps] Proof of idiocy
From: "Will Matney" <craxd1@verizon.net>
Reply-to: craxd1@verizon.net
Date: Mon, 13 Mar 2006 15:24:15 -0500
List-post: <mailto:amps@contesting.com>
See, that's a shame. If I recall, those vernier dials are 8 revolutions per 
turn of 360 deg., and dial counters are set up for 10 turns used on ten turn 
pots. The old National verniers, I cant recall what ratio they were as they had 
the knob type, and the one with the large blank scale and pointer. It looks to 
me though like you'd be hard pressed to find anything that would come out right 
ratio wise. One might try to cheat it with belts, sprockets or gears, but 
that's a big mess to get into. To convert 23 to 20 turns, you'd need a gear 
ratio of 1.15:1 or for 10 turns into 23, 2.3:1. That 2.3 or 1.15 being an odd 
number, is impossible to get in off the shelf components. In gears and 
sprockets you'd need say an 12 tooth and a 13.8 tooth (for 1.15) which is an 
impossible thing. The only way left would be use pulleys and they can slip 
bigtime. Timing belts wont work as they have teeth like a gear. To me, what 
they done is about the absolute dumbest thing any engineer could have t
 hought of. At least they could have used a ratio without an odd number, say 
1/4"-25. Then using a 12 tooth gear or sprocket which is about the smallest, 
you'd need a 15 tooth to match it. 25 / 20 = 1.25. 12 x 1.25 = 15. Then you 
would get 20 turns to the inch. I forget what the maximum movement is for the 
piston in those for a dial to work for full count. That would be the only way 
to do it is use belts and machine custom pulleys.

Best,

Will


*********** REPLY SEPARATOR  ***********

On 3/13/06 at 2:40 PM HAROLD B MANDEL wrote:

>Jerry at Economy says Jennings did this just to prevent easy fixes
>that might void any warranty and to make the equipment
>expensive to repair.
>
>Hal
>On Mon, 13 Mar 2006 13:38:15 -0500 "Will Matney" <craxd1@verizon.net>
>writes:
>> Custom stuff is highly expensive. Thing is, 
>> Jennings had to pay extra too just to use an odd-ball size.
>>



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