Re: 735 crownwheel failure
Posted by: Ben in Maine (IP Logged)
Date: August 09, 2005 09:43PM
<HTML>Hi,,,That little gear is a problem,,,I believe it was origanly a rawhide in the middle,,brass ends to secure it,,,out of scale pinions tend to be noisy,,and anything under 15 teeth is not considerd good engineering practice ,or something like that haha ho ho,,,gear cutters,[milling cutters]are made in profile by #,,,,,,#1cuts rack to135teeth,,#2 cuts 134 to 55 or thereabouts #5 cuts 26teeth to 15 teeth,,,,there the program ends THESE # ARE NOT TO BE TAKEN for use but to get the idea of how it works,,,its too hot to bother get out the gear books,,,that generator pinion is around 9 or 13 teeth,,and a gear company does not make these things,,To proceed,,,you use a #5 CUTTER,, CUT THE TEETH,,,THEN OFSET THE ARBOR,AND SHAVE THE TEETH ON ONE SIDE,,,THEN OFFSET THE OTHER WAY AND CUT AGAIN,,making the 3rd cut,,Then roll a mating gear,the 60T against it to see if it will mesh smoothly,,,Sort of like FEELING a pair of differential gears in a gas car ,, for mesh,, ,I hope this will prompt some of the boys to write about bronze and ally pinions,,,I personally would stay away from welding the crownwheel,,its loaded pretty high I think and a failure would threatn the engine gear which has the eccentrics on it,,which MUST be one piece w/the gearbase,,,,as the engine produces enough torque to shear the key if the key is shorter,as in ,only the gear,, not, gear and eccentric,,, These gears are STD #6 pitch and should be available from a Mill suplier as blanks,Teeth can? be turned off and gear preesed on over,,,,,Please note I make no reference to price or difficulty,,If anyone wants to get involved,,very involved,,I have here a #13 Brown-Sharpe gear miller and a box of cutters,,,and a 4 ton Millwaukee universal Mill to do burner slotting,and most anything else,,,and a 30''casting that needs its teeth slott'd Cheers Ben P/S,,The black racer handles beyond my wildest dreams on DIRT,,,had 'er out on both soft sand and hardpak clay at speed,,,the back end comes around w/close to prcise // JUST where you want it,,Oh to find a 30 mile dirt Roadrace,,[not track] is that back road near Douglas still open and dirt,I wonder,,,A 100 miler would be good I think CB If you guys can't find me it's because i'm hiding over on the Harpsichord thread here on page#2 ! pink tink , lala poi' nggg pink .''...,</HTML>