[CAUT] Moving wippen rail

[Keith Roberts]

Actually there is almost no change in the blow and dip. If you move the
wippen horizontally 2mm, the contact point at the knuckle moves 2.5 mm along
the slope of the magic line. This compensates slightly for the change but
not exactly. It is close enough to make people think the action ratio has
not changed. The length of the arc made by the top of the jack is about the
same. Different force though.

Keith


On 10/25/07, David Love <davidlovepianos at comcast.net> wrote:
>
>  I see.  The net change in leverage with a wippen rail move of a few
> millimeters may not be that significant to show up as an easily measurable
> change in the dip/blow specs.
>
>
>
> David Love
> davidlovepianos at comcast.net
> www.davidlovepianos.com
>
> -----Original Message-----
> *From:* caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] *On Behalf Of *Keith
> Roberts
> *Sent:* Thursday, October 25, 2007 8:20 AM
> *To:* College and University Technicians
> *Subject:* Re: [CAUT] Moving wippen rail
>
>
>
> I think the issue here is the discrepencies between the weight change and
> lack of change of dip and blow. There seems to be a denial that there is any
> change because the dip and blow ratio is the same. What will change is the
> aftertouch.
>
>
>
> Keith
>
>
> On 10/25/07, *David Love* <davidlovepianos at comcast.net> wrote:
>
> I guess the bottom line is your bottom line.  If you shim the wippen rail
> out and the UW and DW drop then what does it really matter whether the
> explanation is vectors or leverage?
>
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