On Sunday 26 March 2017 17:15:13 Marcus Bowman wrote: > On 26 Mar 2017, at 21:15, Ken Strauss wrote: > > Yes but for small angles sin() and tan() are almost identical. > > Sin(7)=0.1219 and tan(7)=0.1228 > > Yes; that's true. Is it not the half-angle anyway; so Tan 3.5 deg ? > Or did I misinterpret the taper? > > Marcus > I believe if the lathe is in radius mode yes, but its in diameter mode ATM. The keyphrase in the machinery handbook is "included angle". Which would be 3.5 degrees off the axis of rotation, and correct for radius mode. I think...
> >> -----Original Message----- > >> From: Marcus Bowman [mailto:marcus.bow...@visible.eclipse.co.uk] > >> Sent: Sunday, March 26, 2017 3:53 PM > >> To: Enhanced Machine Controller (EMC) > >> Subject: Re: [Emc-users] Making taper lock hubs > >> > >> Is the tangent of the angle not more useful? That uses the straight > >> length instead of the hypotenuse (along the tapered face). > >> Opposite over adjacent, rather than opposite over hypotenuse. > >> > >> Marcus > >> > >> On 26 Mar 2017, at 19:48, Gene Heskett wrote: > >>> Greetings everybody; > >>> > >>> As I read the machinists hand book, tapers such as this mean the > >>> "included" angle, not the angle of just one side of a cone. > >>> > >>> So, I've read, where I don't recall, that a taper lock hub is 7 > >>> degrees of taper. It doesn't self eject, but also does not need a > >>> lot of jacking force to unlock it. Or is that magic angle > >>> different, not 7 > > > > degrees? > > > >>> The sin(7)=0.121869343405147462, which I interpret as meaning if > >>> the tool travels an inch, the diameter change is > >>> 0.121869343405147462. > >>> > >>> But the tool is moving only .735" from one end of the taper to the > >>> other, so the additive value for the big end of the taper is then > >>> .735*0.121869343405147462=0.0895739674027833847. Since that is > >>> better than angstrom accuracy, round it down to 4 or 5 digits > >>> right of the decimal makes sense since I'm not carving a new > >>> Hubble mirror here. > >>> > >>> So, bore is .876" (I overshot 7/8" a red one) and I'd like the > >>> taper hub wall to be about 1/16" thick at the small end=1.0000". > >>> Then the diameter at the flange, .735" to the left of that 1" > >>> point, would 1.08957". > >>> > >>> Correct? Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
