Oops! Thank you, Jon! Yes, I forgot to divide by 2. :) No, the original wip centers are quite loose teflon and hence my conclusion that the friction is actually at the cushion-capstan contact. Like I said, the new cushions are centered about 1mm forward compared to the originals. Also, the original cushions are very worn from excessively hard play, and I¹m thinking that¹s what¹s causing the variations and lack of smooth movement as keys are depressed. I¹ve eliminated key friction as a culprit. What¹s an acceptable range for BW? If I can¹t get new repetitions, is it worth trying to bolster cushions or can they be easily replaced? I haven¹t measured FW. Need to set up a jig of some sort? Unless I can fit my little digital gram scale under the front of the key with it still on the balance rail? I need to learn more about that...downloaded and read 3 of Stanwood¹s articles, but I¹m far from a master yet. Thanks again, Jon. -- Paul Milesi Registered Piano Technician (RPT) (202) 667-3136 (202) 246-3136 Cell E-mail: paul at pmpiano.com Website: http://www.pmpiano.com From: Jon Page <jonpage at comcast.net> Reply-To: <caut at ptg.org> Date: Sat, 18 Sep 2010 12:51:37 -0400 To: <caut at ptg.org> Subject: Re: [CAUT] Down Weight Too High With New Hammers > Note DW UW F BW > F69-orig rep 69 33 36 102 > F69-new rep 57 33 24 90 The math for figuring F & BW: (D - U)/ 2 = F (U + D)/2 = BW You forgot to divide by 2. Orig should be: 18 51 New 12 45 Friction is OK with the new but the BW is still too high. Seems like a drastic chance for just changing wips. Were the old wip centers on the tight side? What's the FW? -- Regards, Jon Page -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100918/d82a069b/attachment.htm>
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