[CAUT] Renner back action

[Keith Roberts]

Parallel when the key is depressed and the damper is raised. Draw the line
from the top of the lift felt and parallel to the bottom of the key. In the
the depressed position, the underlever should not go past being parallel to
this line or the contact point moves suddenly. So set the under lever in the
fully depressed position.
Keith Roberts


On Wed, Sep 3, 2008 at 7:14 PM, Mark Dierauf <pianotech at nhpianos.com> wrote:

> I'll have to lower this one quite a bit just to achieve a parallel
> underlever let alone to hit the magic line. I'm concerned that the top of
> the raised underlevers will end up below the upstop rail even at its lowest
> setting.
>
> - Mark Dierauf
>
>
>
> Jon Page wrote:
>
> <div class="moz-text-flowed" style="font-family: -moz-fixed">When reworking
> the back action I am not concerned about the Magic Line.
>
> My concern lies with the elevation of the pivot, meaning that I want the
> key
> to lift the underlever parallel to the key bed. The slots worn in the key
> end felt
> are caused by the underlever being at too much of a downwards angle at
> rest.
> Meaning that the pivot is too high.
>
> This scrubbing is friction. Lifting beyond parallel is also counter
> productive
> because the underlever would scrub against the rear end of the lifter felt.
>
>
>
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