Allan, Jim, For an example of multiple threads, just look at any tuning pin. It's easiest to see if the pin is nickel plated with blued threads - gives good contrast. It looks like they cut the threads using a tool with 4 or 5 points, so that all the helixes start at the same location. Mike ----- Original Message ----- From: Allan L. Gilreath, RPT <agilreath@mindspring.com> To: <pianotech@ptg.org> Sent: Saturday, April 21, 2001 8:28 AM Subject: RE: Fw: just what is 7/32"? > Brother Jim, > > I looked it up for you in the "Millwright's and Mechanics Guide." > > "Multiple Thread - A screw thread that is formed of two or more single > threads. A double thread has two separate or single threads starting > diametrically opposite or at points 180 degrees apart. A triple thread has > three single threads starting at points 120 degrees apart. A quadruple > thread has four single threads starting at points 90 degrees apart. A > multiple thread is used to increase the lead of a screw." (p 355) > > Clear as mud, right? <grin> > > Allan > Allan L. Gilreath, RPT > Assistant Director - TEAM2001 > July 11-15, 2001 - Reno, NV > agilreath@mindspring.com > http://www.ptg.org/conv.htm > Director: Laura Olsen, RPT > Assistant Directors: Allan Gilreath, RPT - Gary Neie, RPT - Dale Probst, RPT > > -----Original Message----- > From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf > Of JIMRPT@AOL.COM > Sent: Saturday, April 21, 2001 6:46 AM > To: pianotech@ptg.org > Subject: Re: Fw: just what is 7/32"? > > > > In a message dated 4/21/2001 12:28:05 AM, you wrote: > > <<Hi Jim > > Describe what is meant by Helix thread ,Please. > > Dale>> > > Dale; > Double "helix" might not be the correct term that's why I put "?" after > each use. :-) > It is where a double set of threads are cut in a cylinder, or said another > way where there are duplicate, parallel, sets of threads running on the same > cylinder. > Jim Bryant (FL) > >
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