Started by
Member
Member
Dear Pianoexpert, I saw on Y.T. an Eastern colleague of yours who, to increase the smoothness of the front guide pins of the chromatic keys of a grand piano keyboard, worked with a special electric tool with a heated tip shaped like the imprint of the key mortises and inserted it into them, obtaining the desired result; can you explain to me what effect heat has on the cashmere of the mortises?
THANK YOU and COMPLIMENTS again for your video tutorials!!
Greetings from the Varese area
saverio
Moderator
The heating tool is used primarily to unstick the felts. It can also be used to heat the mortises....but one must see how to reactivate the glue. Let me explain. When the Kasimir gaskets are redone, one should choose whether to do them hot or cold, always using hot glue.
COLD: with cauls, clips, plastic wedges. The glue and the two edges of the cloth are placed, and then the graduated caul is applied. When the glue has set... it's done
HOT: special brass cauls are used which, when heated, are inserted hot into the Kasimir. AT THAT MOMENT, yes, they reactivate the glue and the cloth walls stretch perfectly, subsequently offering; once the work is finished and cold, minimal play on the keyboard pins. Obviously, the stretching of the cloth edges favors smoothness, BUT ONLY IF THEY ARE PERFECTLY PARALLEL. Then you will have the same minimal play in any key depression position, with minimal friction.
Member
Thank you Maestro Paolo for the exquisitely technical and exhaustive response!!!
greetings
saverio
