William, When one is doing a lot of bending of rigid conduit, where the finished length of pipe needs to be determined, after all bends are made, and threading happens first due to bends interfering with the threading machine, one develops a DOPE sheet. The term being borrowed from long distance marksmanship, Data On Previous Engagements. One bends scrap pipe to various angles, and by making marks where the bender makes contact with both stub marks, and the 45 degree and saddle marks, a cheat sheet can be developed to help with arriving at desired stub lengths and calculating “shrink”, the amount that a length of pipe shortens after bends are made. Similarly a DOPE sheet can be made, or trigonometry can be used when making concentric bends and segmented bending.
That was the world I inhabited for a decade and a half. Now days, if I get into that situation, bend and cut : ) Michael > On Nov 2, 2018, at 12:23 PM, Ray <[email protected]> wrote: > > I usually do the bend and cut method, because it really is faster and EMT is > cheap. Look how much time you are already cooking doing research and > exploring various apps, etc? I too have wanted to be the cool pro, and bend > to exact measurements, but alas, the sun is setting much sooner now, and I > need to get the job done. Also, I recently picked up a nifty reamer > attachment that chucks up in a cordless drill and finishes the cut end > nicely. Between that and my porta band saw, the bend and cut method is > faster and the finished job is just as good. Actually I just switched to > Metal Clad 6-3 for my PV runs, and it seems better as well. > > I look forward to hearing what other more accomplished conduit smiths have to > offer, though. > > Ray Walters > Remote Solar > 303 505-8760 > On 11/2/18 12:18 PM, William Miller wrote: >> Colleagues: >> >> I am always trying to improve my conduit bending skills. I came upon this >> scenario and need some input: >> >> I am bending stubs at less than 90 degrees. How do I calculate stub heights >> at less than 90 degrees? I am using the old >> bend-it-longer-and-cut-it-to-length method but that does not suit my >> personal style. I want to make a mark, bend from it and have it fit. >> >> I have searched on line and purchased several IOS apps for conduit bending. >> None of my research has turned up an answer. >> >> Thanks in advance for any advice. >> >> William >> >> >> >> <image003.jpg> >> Lic 773985 >> millersolar.com <http://www.millersolar.com/> >> 805-438-5600 >> >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> <mailto:[email protected]> >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/maillist.html >> <http://www.mail-archive.com/[email protected]/maillist.html> >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> >> >> Check out or update participant bios: >> www.members.re-wrenches.org <http://www.members.re-wrenches.org/> >> > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > <mailto:[email protected]> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > <http://www.mail-archive.com/[email protected]/maillist.html> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > www.members.re-wrenches.org <http://www.members.re-wrenches.org/> >
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