blow discrepancy:technique?

[Roger Jolly]

Hi David,
             This the method that Yamaha teaches, and I have found it to be
the most consistent, particularly with re shaped hammers.
Eye balling the strike point is taken out of the equasion.
Roger 
>
>David Renaud wrote:
>
>> I have always measured a straight line from hammer tip to string.
>>
>> But:
>> A colleague insists the best way to determine travel in an upright
>> is to push a hammer molding forward to the stings
>> with a ruler, mesuring from the back edges of the respective
>> hammer moldings.
>>
>> I find that this method always produces a slightly reduced
>> reading. On my action model a 1/16th reduced reading.
>> This is apparently due to the hammer always traveling
>> from an angled position to a perpendicular position relative to
>> to strings. It will always reach slightly forward as it assumes a
>> perpendicular position and block premature of its straight
>> line measurement. So he could be right.
>>
>> But:
>> The hammer is traveling though an arc. So it is greater
>> then any straight line measure anyway. So I still I'm still right.
>>
>> Never thought much on this before. Was always concerned
>> more with relationships working between travel distance
>> and key travel for correct aftertouch then travel being 1 7/8.
>> The test seems to support this as it gives +/- 1/8 to make it
>> work. Never less in a test siduation 1/16+ difference due
>> to measuring technique is too much.
>>
>> So is my hammer to string, straight line technique
>> from the front of the hammer wrong?
>> Or is is better to approach these measurements from the
>> rear measuring molding to molding with the hammer engaged?
>>
>>                                                      Cheers
>>                                                      Dave Renaud
>
>--
>Richard Brekne
>Associate PTG, N.P.T.F.
>Bergen, Norway
> 
Roger Jolly
Saskatoon, Canada.
306-665-0213
Fax 652-0505