you may still have to grind it. the phase and helix angle of the cutting edge of the flute is only correct at the edge of one flute of the tap, where the helical angle is nearly degenerate. then the relevant match is pitch of cutter vs gear.
i am thinking of application which is cutting a worm gear with a common thread pitch worm as the drive. the ground tap serves as an inexpensive version of a threadmill and reduces process time over single point type thread milling. --- On Thu, 7/4/13, andy pugh <[email protected]> wrote: > From: andy pugh <[email protected]> > Subject: Re: [Emc-users] Cutting involute spur gears with 4 axis? > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Date: Thursday, July 4, 2013, 3:39 AM > On 4 July 2013 11:01, charles green > <[email protected]> > wrote: > > in some cases, a tap can be ground to serve as a gear > cutter. > > If you don't mind a 23.75 degree pressure angle and an > irrational > module then you don't even have to grind it. > (If you use a BA tap) > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
