[CAUT] measuring wippen weight

[Garee, Anne E.]

Barb,

There is a .4 change in action ratio either up or down when the half
punching or balance rail veneer is used to help correct a high or low R.
However, the KR you read on the metrology table will be about the same
with or without the half punching and is a bit of a challenge to get
consistent readings on the jig with the half punching installed.  

 

I have run around the block with quite a few actions chasing the ratio.
I have learned to pull back and readdress geometry before continuing the
chase.   The FW ceiling chart is very useful to keep you from adding too
much lead.

Anne    

 

________________________________

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
Barbara Richmond
Sent: Friday, September 28, 2007 3:23 PM
To: College and University Technicians
Subject: Re: [CAUT] measuring wippen weight

 

Hi Anne,

 

Well, this piano has low KR (4.5-4.6) and moving the capstan backwards
put the heel even closer to the wip flange--adding friction and then the
amount of lead I'd have to put in the keys...well...it seemed like I was
going in the wrong direction.  I spent a lot of time trying all sorts of
combinations.  The replacement wips lower the friction compared to the
originals.  I also feel better about using new parts.  The old ones
weren't horrible, but they weren't going to get any younger, either.  

 

The WW turned out to be 20.6.  

 

BTW, is there a way to measure the KR when using a half punching on the
front or back of the balance hole?  I haven't thrown any keys up on the
Stanwood gizmo and try, of course.  There's the obvious BW difference,
just wondering about the KR number.

 

Thanks for your help.

 

Barbara Richmond, RPT

near Peoria, Illinois

 

 

	----- Original Message ----- 

	From: Garee, Anne E. <mailto:agaree at admin.fsu.edu>  

	To: College and University Technicians <mailto:caut at ptg.org>  

	Sent: Wednesday, September 26, 2007 4:45 PM

	Subject: Re: [CAUT] measuring wippen weight

	 

	Barb,

	If "front heavy" means heel moved towards the jack, the result
is a lower WW.  Heel moved towards the flange will be a higher WW.  I
put a heel on a rep at an extreme position towards the flange and
balanced it on the scale.  I could get as high as a 20 gram WW and then
the rep would not stay on the jig (which might be your original
question).  The heel position was so extreme at that point, that one
might question whether this design will function well this far out of
the box.  

	Anne

	 

	
________________________________


	From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On
Behalf Of Barbara Richmond
	Sent: Wednesday, September 26, 2007 2:57 PM
	To: College and University Technicians
	Subject: Re: [CAUT] measuring wippen weight

	 

	Thanks, Anne.

	 

	I will give your suggestions a try.

	 

	So, in the great scheme of things, is there something I should
know about front heavy wippens? 

	 

	 

	Barbara Richmond

	near Peoria, Illinois

		----- Original Message ----- 

		From: Garee, Anne E. <mailto:agaree at admin.fsu.edu>  

		To: College and University Technicians
<mailto:caut at ptg.org>  

		Sent: Wednesday, September 26, 2007 9:30 AM

		Subject: Re: [CAUT] measuring wippen weight

		 

		Barb,

		If it is tipping to one side, trim the damper felt on
your scale pan jig to off-set it a bit.  You can then turn the jig
around for two different angles.  Make sure you have soaked the jig felt
in lacquer to stiffen it and create a bit more friction.  You can also
slightly rough up the bottom of the angled flange that sits on the
roller or put a bit of spray adhesive on it temporarily.

		Anne Garee

		Florida State University

		 

		
________________________________


		From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org]
On Behalf Of Barbara Richmond
		Sent: Wednesday, September 26, 2007 8:40 AM
		To: College and University Technicians
		Subject: [CAUT] measuring wippen weight

		 

		Howdy,

		 

		I have some Renner Steinway wips that I'm altering to
fit a Knabe.  Be joyful that I'm not going to tell the story of all the
testing I've done on this action.  Anyway, besides replacing the flanges
(obviously), I'm having to move the heel backwards (toward the flange).
When the wips were in their original state, the WW was 17.  Now with the
heels moved and the little/angled Knabe flanges on, I can't get the wip
to balance so I can get a reading.  Do I just hold it lightly against
the "tower?" or tie it with thread or use a rubber band or just ignore
it?

		 

		This wippen set up is the best (of the many) I've
tried--feels good, less friction.  I'm just curious about the numbers. 

		 

		Thanks,

		 

		Barbara Richmond, RPT

		near Peoria, Illinois

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