Pianotech

  • 1.  Action center friction resistance-in-grams numbers

    Member
    Posted 01-06-2023 21:21
    I'm going to start measuring action center resistance with a gram gauge. Would someone please give me the resistance in grams for each type of action center? Thanks in advance.

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    Robert Sluss
    Lake City FL
    (386) 752-1888
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  • 2.  RE: Action center friction resistance-in-grams numbers

    Member
    Posted 01-06-2023 21:36
    5 to 8 gm on hammer flange
    3 to 5 gm on whippen flange
    1 to 3 on the jack
    4 to 7 on the rep/balancier post

     Where you measure from is important - there are some articles in past PTG Journals

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    James Kelly
    Owner- Fur Elise Piano Service
    Pawleys Island SC
    (843) 325-4357
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    Original Message


  • 3.  RE: Action center friction resistance-in-grams numbers

    Posted 01-09-2023 16:09
    This may be true for repinning existing parts,

    but beware, I have seen a definite change in the industry, over the years, in newly manufactured  products from ALL manufacturers and you would be lucky to find a NEW hammer flange pinned at even 3 grams.  In my discussions with the various manufacturers, it is more about the consistency of pinning and the stability of the centerpin in the birdseye than the gram measurement of resistance ... Two of the great resources I used for this same discussion were Bruce Clark (Mason Hamlin WNG) and Rick Baldassin (Renner product) . Perhaps one of them is on this list and can comment more fully.

    Melanie

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    Melanie Brooks
    Brooks LTD LLC
    152 Rte 163 Bldg A
    Uncasville, CT 06382
    800-326-2440



    Original Message


  • 4.  RE: Action center friction resistance-in-grams numbers

    Member
    Posted 01-11-2023 21:02
    Its quite possible that these ranges have changed in newer parts and that they are different  from what I have used. My info came from articles in the journal on repinning and from various discussion threads.  I have heard that some new parts have had to be eased because they barely passed a swing test meaning the gram resistance was very high. Someplace in the journal archives there is a good discussion of where to measure. I think there is something on the WN&G site showing a jig and a Corex gauge and how to measure various centers. It would be good to hear from Bruce and Rick or Del on this.

    Thanks Melanie for bringing this point up

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    James Kelly
    Owner- Fur Elise Piano Service
    Pawleys Island SC
    (843) 325-4357
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    Original Message