Fabulous and crystal-clear instructions. Thanks Al. Andrew Baron Santa Fe
On Jan 31, 2013, at 2:32 AM, [email protected] wrote: > > > Since sintered bronze is many tiny spheres welded together so that millions > of capillary passages occur between them, when you machine it you must take > care not to cause the bronze surface to be smeared rather than sheared away > by the cutting tool. This means you need a high cutting speed with a slow > feed to a razor sharp carbide cutting tool that is more broad than the feed > rate. Dress the carbide point to have a broad radius of 0.050" or greater > and be sure the feed is down around 0.010" or less so that each pass cut > overlaps. A dull carbide bit will just push the capillaries shut. It is > also a good idea to make many shallow cuts rather than deep ones. This is if > you are using a boring bar. I prefer to use a razor sharp reamer that is > 0.0005" over size. This allows the bearing to be low in friction and able to > maintain an oil film over the shaft during rotation. > > Al > > > > _______________________________________________ > Phono-L mailing list > http://phono-l.org > _______________________________________________ Phono-L mailing list http://phono-l.org
