On Sunday 28 March 2010, Dave Caroline wrote: >Gene I use an "angle dekkor" when at the last job using the dividing >plates I made some bad gears, >So some diagnosis was done. > >Simple method was use a digital vernier over an arbitary number of >teeth set zero rinse repeat around the gear setting 0 whenever it was >-ve after another lap you will see a peak error, this can also be done >to a dividing plate. >this showed some serious error at the time. > >The angle dekkor is an auto collimator for measuring angles see >http://en.wikiversity.org/wiki/Auto_collimator >we tested all our dividing heads and they turned out to be mainly very >bad nearly a degree out, most of the error was cyclic and could be >shown to be the worm coming into engagement once per rev of the worm, >we got a sawtooth error >we only had one dividing head that worked to any sort of spec and we >used it to create a new dividing plate with standard numbers for clock >gears. > >I have done the simple test on a high count gear made on a Taiwan >rotary it was passable. > >Once per worm wheel cyclic error is less important for clock gears and >was not investigated at the time. > That is, or has been called the bull gear in my parts, and in my table, its eccentricity is the major problem. I've tried to tighten the worm and 'wear' it in, but have not been terribly successful. I might buy a better one, but the better ones are all too big for my machine, out weighing the machine itself.
>Dave Caroline > >-------------------------------------------------------------------------- >---- Download Intel® Parallel Studio Eval >Try the new software tools for yourself. Speed compiling, find bugs >proactively, and fine-tune applications for parallel performance. >See why Intel Parallel Studio got high marks during beta. >http://p.sf.net/sfu/intel-sw-dev >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Very few things happen at the right time, and the rest do not happen at all. The conscientious historian will correct these defects. -- Herodotus ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
