thegreatestben Posted November 1, 2011 Share Posted November 1, 2011 I watched your video with headphones on whilst on my break at work. Fucking hell it was awesome/loud when you put the starter on. Quote Link to comment Share on other sites More sharing options...
1vaknd Posted November 1, 2011 Share Posted November 1, 2011 Fill whole room with engine start. Should work a charm. until one of them backfires due to lack of exhaust! Quote Link to comment Share on other sites More sharing options...
Ned Posted November 1, 2011 Author Share Posted November 1, 2011 fuck.... just fuck. Quote Link to comment Share on other sites More sharing options...
rot808 Posted November 1, 2011 Share Posted November 1, 2011 jesus, explain, now tell me the shafts didnt snap Quote Link to comment Share on other sites More sharing options...
KKtrips Posted November 1, 2011 Share Posted November 1, 2011 My guess is the crankshaft has snapped off on one of the motors at the end - that looks a fuckload of chain tension in the video Did you have a chain tensioner in there? Quote Link to comment Share on other sites More sharing options...
governorsam Posted November 1, 2011 Share Posted November 1, 2011 poo Quote Link to comment Share on other sites More sharing options...
Beaver Posted November 1, 2011 Share Posted November 1, 2011 dont think anyone has said this but I think your chain is too tight Quote Link to comment Share on other sites More sharing options...
Ned Posted November 1, 2011 Author Share Posted November 1, 2011 shaft snapped May have to re-think this one TBH... make it a 5 opposed twin crank on crank and spin 1/2 backwards with 2 sprockets to counter the side loading and a bearing in the middle? means i need 3 plates but fuck it.... open to ideas at this point anyway. Could just get a new shaft, but it's bound to happen again. This is only the force of a 1 or 2 KW starter motor... imagine the full force of the 9 other motors instead. Though the shaft is/was hollow so wasn't going to be too strong but thought it would survive this Also; no chain tensioner. but the chain would move a bit... about 1" or maybe more of movement on the chain on the long bit? The one that snaps is the first one to take the force of the starter motor and because the starter doesn't have a gradual on stage, it gets full force on it instantly when i try and start it. Quote Link to comment Share on other sites More sharing options...
Ned Posted November 1, 2011 Author Share Posted November 1, 2011 dont think anyone has said this but I think your chain is too tight If i run my chain any looser, it drags on the flywheels spinning the oppsite direction etc. It's def not a loose chain, but it wasn't killer tight i don't think. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted November 1, 2011 Share Posted November 1, 2011 would run the chain loose but then run a chain tensioner to take up the slack - or have one of the end motors on a set of a slotted holes to adjust out the chain slack. If you run the chain at "perfect length" then unless you have the motors PERFECTLY spaced to the pitch of the chain then you are going to load the fuck out of the 2 pivotal crankshafts - the 1 at either end where the chain wraps around most of the sprocket.. (I don't know the correct engineering terms for these points but I think you may get what I mean) Quote Link to comment Share on other sites More sharing options...
1vaknd Posted November 1, 2011 Share Posted November 1, 2011 lower the right hand bank 20-30 mm so there is less of the chain on the sprocket. therefore less friction. maybe? Quote Link to comment Share on other sites More sharing options...
Yowzer Posted November 1, 2011 Share Posted November 1, 2011 What if instead of chains linking them together, they were all gears? Or perhaps support the shaft on the other side of the sprocket too so the only force on the shaft is torsional. Or both? Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted November 1, 2011 Share Posted November 1, 2011 what size is the output shaft on the motors? Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted November 1, 2011 Share Posted November 1, 2011 What if instead of chains linking them together, they were all gears? Or perhaps support the shaft on the other side of the sprocket too so the only force on the shaft is torsional.Or both? Gear drives have to be really really well aligned to work good. A chain will give you heaps more bonus tolerance Quote Link to comment Share on other sites More sharing options...
Yowzer Posted November 1, 2011 Share Posted November 1, 2011 Yeah true. Supporting the shaft from both sides should improve it a fair bit though. Quote Link to comment Share on other sites More sharing options...
Toucan Posted November 1, 2011 Share Posted November 1, 2011 Idler sprocket supported on both sides between the plates after first and last motor Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted November 1, 2011 Share Posted November 1, 2011 Idler sprocket supported on both sides between the plates after first and last motor already is. supported shaft from both sides will be the answer like said. Quote Link to comment Share on other sites More sharing options...
1vaknd Posted November 1, 2011 Share Posted November 1, 2011 just an idea? Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted November 1, 2011 Share Posted November 1, 2011 just an idea? like Quote Link to comment Share on other sites More sharing options...
anglia4 Posted November 1, 2011 Share Posted November 1, 2011 completely agree with the too much force pic. Pretty sure that would help alot Quote Link to comment Share on other sites More sharing options...
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