Can you harden Zinc alloy? Scott Jackson On 20/09/10 07:10, Roger Gable wrote: > Jon, > I suggest an alternate repair. Reshape the original insert and have > the machinist who is working with you check the hardness at the crown. > It should be around Rockwell 40. If not, explore having it hardened. > It could end up costing less to harden the insert rather than machine > a slot. Also, the water hardened drill rod you obtained from your > local supplier is probably too hard and may cause buzzing at the > duplex. Additionally, I've always felt that the capo should have as > few mechanical "interruptions" as possible. > > >> A post last month showed the string impressions in the v-bar insert >> on a 1996 Weber grand. >> http://ptg.org/pipermail/pianotech.php/2010-August/027631.html > John, > > That looks like the Zinc alloy inserts that were used for a short time in > about 1994 or so. They not only were too soft, they made the piano very > hard to tune! Very sticky material with steel wire pressing against it. > > They later changed them to brass, which tuned a lot smoother but tended to > make the tone more zingy, and create more duplex noise because the angle > through the capo area was fairly shallow. > > I agree with your solution to use brass rod, but you might want to increase > the counter-bearing angle a little while you're at it. > > Don Mannino > > -----Original Message----- > From:pianotech-bounces at ptg.org <http://ptg.org/mailman/listinfo/pianotech> [mailto:pianotech-bounces at ptg.org <http://ptg.org/mailman/listinfo/pianotech>] On Behalf > Of Jon Page > Sent: Monday, August 30, 2010 2:07 PM > To: pianotech list > Subject: [pianotech] YC Capo Bars > > A while ago I posted pix of a YC with the treble wire dug into the capo > bars. I have the capo inserts removed and here's the photos. > > I called YC and they do not support this model 1996 Weber anymore. > > I found some round rod and tested it by hammering a piece of music wire onto > it. The wire flattened but the rod didn't budge. > > I'll have a machine shop plane down the surface and mill a groove to hold > the rod at the appropriate height. I'll not worry about the duplex, I'll > make it straight. > > So much for making a quick buck on a spec piano. > -- > > Regards, > > Jon Page
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