OzVMX Forum
Clubroom => Tech Talk => Topic started by: bananas161 on April 05, 2013, 02:15:50 pm
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anybody got any ideas on how build a strong roller starter .whats the best way to power it thinking electric motor and generator. got to turn a J.A.P 15;1 COMP.im getting to old be pushing this shitbox around the pits and mates are getting harder to find ?????? any advise would greatly appreciated cheers
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I have been thinking of building one myself of late. Have a walk round a pit area at a historic road race, there are lots of rollers powered by cordless angle grinders. Lots of torque and no generator needed, just make sure the battery is charged or it's the "push" again.
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bit pricy but look the goods..
http://www.roscosrollers.com/ (http://www.roscosrollers.com/)
i'm after a set of rollers for my historic bike too, and at least these ones are 12V so you wont need a 240volt plug/generator
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Gooday Bananas! The trick with starting a high comp 500 seems to be to use a higher gear than for a push and bump start.
pancho
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thanks for the info fellas ill email you tomorrow wasp ....and pancho your quite welcome to use it anytime you want it might add afew years on to our raceing lives :) ;D :o ???
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I think the Rosco Rollers work ok on road or dirt track tyres but are not as good with motocross tyres. The small diameter rollers go into the gap between the lugs and don't seem to get enough traction to keep the wheel turning.
I will be modifying mine to a larger drive roller and wrap it with off road truck tread from the local retreading shop hopfully that will work unless you blokes have a better idea.
Wasp, any chance of putting up a photo of yours.
Zane
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thanks for the info fellas ill email you tomorrow wasp ....and pancho your quite welcome to use it anytime you want it might add afew years on to our raceing lives :) ;D :o ???
8) ;D 8)
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If you make one the curved roller looks like its off a boat trailer for the boat to roll up on.
Look on trade me (unzud) theres one for sale with covers off can see how to make one-looks simple.
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road tested Rosco rollers over the weekend at the creek,pretty bloody good,just used my van battery,spun up my 250 single ok,couple other guys had to use it too,when another type wouldn't spin their motors over,not sure of costs,coz i borrowed it ;D, :P
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I rebuilt my starter rolls using two 100mm rollers and a foot activated switch it also stands on it's base so it takes up less room when not in use. I was going to wrap the rolls in tyre tread from my local retreader but with both of the rolls driving they turn over knobby tyres and have no trouble starting moto crossers.
The biggest problem is that I used a 9 inch angle grinder for power and with the starters size and weight it's only suitable for the workshop and the chain drive is very noisy.
I have drawn up a design for a more portable set powered by a starter motor and with a single belt drive connecting both rollers to the motor and also using 100mm rolls.
Anyone see any problems with it sometimes you can look at something and not see the obvious.
Workshop Starter Rolls
(http://i907.photobucket.com/albums/ac276/zane255/Starterrollsworkshop004_zpsb83801d6.jpg) (http://s907.photobucket.com/user/zane255/media/Starterrollsworkshop004_zpsb83801d6.jpg.html)
(http://i907.photobucket.com/albums/ac276/zane255/Starterrollsworkshop0051_zpsf5469b88.jpg) (http://s907.photobucket.com/user/zane255/media/Starterrollsworkshop0051_zpsf5469b88.jpg.html)
12 volt starter rolls
(http://i907.photobucket.com/albums/ac276/zane255/12voltStarterRolls_zps077a1dd9.jpg) (http://s907.photobucket.com/user/zane255/media/12voltStarterRolls_zps077a1dd9.jpg.html)
Zane
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$700 odd for a Ezistart roller is looking very cheap