Before anyone makes new rotaries, I have an interesting article from Summer school in electrical engineering, proceedings July 12 to 16 1948 BTH, The British Thomson-Houston Co Ltd Vibration and noise problems in engineering They were using an early spectrum analysis tool listening to the noise from a drive gear set made on a hobbing machine.
http://www.collection.archivist.info/archive/proceedings/PR22/ see pages 60 61 and the table on page 66 The dominant error as you may see is regular error at tooth frequency A way I would put it is, if there were no accuracy errors there would be no sound to measure. Even the the measures they took to make the 360 master wheel still show up in the the result in table 1. The accuracy of a worm drive is also very important to telescope makers and to show the periodic error I mentioned earlier in this thread this page has some graphs http://www.pk3.org/Astro/index.htm?astrophoto_mount_errors.htm Just think how you are going to make your worm pitch match yout worm gear pcd to the accuracy needed. Hope it all goes well. Dave Caroline ------------------------------------------------------------------------------ Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
