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| Cutting a flat spiral gear / grinder pattern. |
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| Manxmodder:
Neo,it is an odd looking setup and the first time I ever saw it used was on an experimental TZ 700 Yamaha sidecar engine built by well known sidecar builder and racer Trevor Ireson showed me in the early 80's. He had a very trick design that used one rotating disc valve at the cylinder manifold interface to control the inlet opening/closing times of 2 adjacent cylinders(the disc mounted on an shaft at a point between the 2 cylinders). Originally he started with just the 2 discs mounted on 2 seperate shafts controlling all 4 inlet ports. Later he improved by employing a design of Helmut Fath's another famous sidecar builder and vastly talented engineer who scratch designed and built world beating 2 stroke and 4 stroke race motors,Google URS engine for more on that. Fath's design employed 2 coaxial contra rotating disc valves on the same shaft which effectively doubled the port opening/closing speed hence allowing for greater degrees of opening dwell in relation to piston travel/crank rotation and controlling port timing very accurately. Ireson's later improved design merely added another 2 discs coaxial with the first pair and a second drive belt from the opposite end of the crank took care of the contra rotation bit. The net result was greater torque and flexibility of power band with port timings which gave big horse power higher up the rev range. Do you think you might consider using this type of belt drive to achieve your requirement? Keep me posted on any further developments re powered rotary table project. Hope that didn't bore you too much, Bye for now.....OZ. |
| NeoTech:
Well my approach was to mount a gear on the turn handle axle out of the table, having a idlear gear that mesh with somekind of worm gear box, a shaft that connects to the turn table.. and the turning motion would be calculated through gearing.. But belting would work as well i guess. And belting requires less.. hassle.. :D |
| Manxmodder:
Yeah,the toothed belts are available in a wide variety of widths and pitches and they are pretty inexpensive to buy. The pulleys are also readily available from a lot of suppliers,but you may want to consider machining your own large toothed pulley that would drive the rotary table. There are a couple of videos on youtube showing how to cut your own toothed pulleys using a fly cutter in the milling machine. The other good thing with the belt method is you won't have any backlash like you would with gears. Maybe you could get a couple of camshaft pulleys from the vehicle breakers just to experiment with......OZ. |
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