This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hello, Is not roughening with a file adding thickness to the iron wire , not as much as with a brass center pin but certainly a little ? My process involve the use of 2 medium files (with crossed lines) and the thickness certainly grows, I am able to obtain sometime a "one tool does it all" while controlling the thickness with a micrometer, but it is not really accurate, more is the use of a center pin wire as a burnished. I don't understand how you can obtain a tool that is at the same time a reamer and a burnishes. With a center wire (we buy these in 50 cm length) rolling between 2 files the size grows from one to 2 sizes, depending of the files used. As these clog and are to be roughened again the tool is changing size and strength and I have to make new ones on a regular basis. So I have to develop a feel for the efficiency of the tool, if I do pinning regularly I keep it, if I don't for some time it takes 10-15 pins to find the good method. I am very interested in your broaches, but the sizes seem to differ from the metric sizes we are used too, so I should make some on metric wires myself. I've been using piano strings for that, but they are not straight enough mostly, and some sizes are not common. How large is the roughened part on your broaches ? Thanks in advance Greetings Isaac OLEG Isaac OLEG Entertain et reparation de pianos. PianoTech 17 rue de Choisy 94400 VITRY sur SEINE FRANCE tel : 033 01 47 18 06 98 fax : 033 01 47 18 06 90 cell: 06 60 42 58 77 -----Message d'origine----- De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la part de Donald Mannino Envoye : dimanche 13 avril 2003 05:48 A : Pianotech Objet : Re: Broach roughness - Was: Repinning flanges John, I used to do it with the edge surface of a large bastard file, roll the wire on the workbench, changing the angle to randomize the marks in the wire. I believe Schaff's machinist rolls the wire on a coarse grinding wheel, but I am not sure. The Schaff ones are usually perfect. Don At 03:57 PM 4/11/2003 -0300, you wrote: Hi Don, Would you enlighten us, on the method used to make the roughness on the broaches? Thank you. Regards, John M. Ross Windsor, Nova Scotia, Canada jrpiano@win.eastlink.ca ----- Original Message ----- From: Donald Mannino To: Pianotech Sent: Friday, April 11, 2003 3:29 PM Subject: Re: Broach roughness - Was: Repinning flanges Clyde, You are right - the old APSCO broaches were really nasty, with the rough area knurled and much too agressive. Hopefully Schaff threw them all out when theybought APSCO, but I don't realyl know. The rough area is supposed to be subtly rough, with something like the grit of fine sandpaper, maybe 320 grit or finer. The point is that the felt should not be chewed up when reaming, and the reaming area should not be larger than the smooth area, or the smooth area would not do a good job of burnishing the cloth. If the broach gets clogged up, the cloth has very likely been lubricated with something that has become gummy. I run into this sometimes, and it immediately throws up a red flag. If the cloth is gummy and sticky, there's a very good chance that reaming and repinning is not going to be a permanent solution. The gumminess will rear it's ugly head again, and the action will go sluggish. In this case you might consider cleaning all the bushings with naptha, then keeping a cloth nearby to clean the broach occasionally. With clean dry bushing cloth, a quick tap on the edge of the workbench is all that is needed to shake out any wool dust that has accumulated on the broach. I have had broach sets that were used to do many, many sets of action parts that kept working like new. Don Mannino At 06:45 AM 4/11/2003 -0400, you wrote: Friends, I discovered quite by accident at a PTG convention, when looking over tools, that the rough part of broaches can be quite different. I have used the same set for years, and the rough part is not rough enough to "clog up." They always worked fine for me. But I came across a set that was so rough that it looked to me like they stood a good chance of removing too much felt. I would be afraid to use them unless someone else looked at them and said, "Oh, yes, that's the way my set is, and they work fine." I'm not going to buy such a set just to try it out. Regards, Clyde David Love wrote: > In the process of repinning the action using broaches, I found that the > roughened part of the broach kept clogging with felt which reduced it's > cutting efficiency. _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/23/02/94/e5/attachment.htm ---------------------- multipart/alternative attachment--
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