Ratio question

[Farrell]

Thanks Jon, you saved me the trouble....

Terry Farrell

----- Original Message ----- 
> If you don't measure the dip at the front of the key (where it is 1:1)
> you have to consider the length of the key and the angle formed from
> pivoting on the balance rail and how far back from the front you measure.
> 
> For instance, my dip block measures 48 mm in length,
> 9.9 mm (.390") at the front tapering to 8.4 mm.
> 
> That's roughly .19 mm decrease for each 6 mm moved back.
> 
> But it is much too complicated for the task involved. Not only do you
> have to consider the angle of the key at dip, you have to consider
> the rate of height change on the risen key since it is pivoted at the 
> back rail.
> So the height measured 6 mm back on that key will be ever so
> minutely less than the +1mm due to the longer radius (probably half
> the rate of change as the 'dipped' key due to twice the radius).
> 
> Keep life simple, measure dip at the front, 1:1.
> 
> The amount of dip is dependant on what is required for regulation
> but that's a different topic.
> 
> Jon Page
>