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Tool Talk Discussion Forum

gas powered cement mixer

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rod s

12-11-2004 14:37:30




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Hi all I just got an old cement mixer it says 3 1/2 on the bottom and London Cement manufacturing on it this was running off a now missing 10 HP gas engine can anyone let me know about this can I convert it to electric it is mounted on its own axle and you can tow it around the thing is chain drive where the motor is supposed to go is a sprocket and chain I think either PTO driven or electric but it is pretty big for electric
regards
rod

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rod s

12-16-2004 06:42:24




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 Re: gas powered cement mixer in reply to rod s, 12-11-2004 14:37:30  
this is a pretty big heavy unit the fellow I got it from used a 5hp on it to try it out and it would not turn it when full of concrete the toothed sprocket is 10 inches across at the drive point this is what is driven from the engine the sprocket that turns the tub is 5 inches across the tub itself is 36 inches across counting the toothed part that is driven, inside tub measures 17 inches at top and 30 inches across the inside the extra 6 inches in width is toothed part that is driven by the 5 inch gear. regards
rod

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JoeK

12-13-2004 22:56:47




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 Re: gas powered cement mixer in reply to rod s, 12-11-2004 14:37:30  
Sounds like it's a 3.5 cubic foot mixer.10hp sounds way to big.Most 3.5s run off a 1/2-1 hp electric motor.Several gas models I;ve seen,worked on are driven by 5-6HP Briggs engines w/built in gear reduction,a pretty economical and dependable little engine for low rpm jobs.I'm pretty sure a 3.5-5 hp tiller type engine would do the job..trick is gonna be the pulley(or sprocket)gearing.A standard Briggs runs about 3600 so a 2" drive and a 16" driven pulley would bring drive pinion down to around 650rpm.One would need to know the final pinion to ring gear ratio to calculate correct tub rpm before buying pulleys/sprockets.

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And

12-13-2004 23:17:02




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 Re: gas powered cement mixer in reply to JoeK, 12-13-2004 22:56:47  
Okay,drum speed for a mixer like that should be 20-25 RPM,according to a few mfgs,so all that left us to figure gear ratio of pinion/ring gear,ie:how many turns the driveshaft makes per one turn of the tub. :)



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KIDbob

12-12-2004 10:07:40




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 Re: gas powered cement mixer in reply to rod s, 12-11-2004 14:37:30  
It would take a 5HP electric to match the original 10HP gas engine, but the electric would be to fast for direcd drive to the chain. A 540 RPM PTO drive would be easer to get the correct speed with only one chain. The tractor PTO would run backwards to the engine output shaft. Maybe run a drive shaft under the mixer to the other side.



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Rod in Smiths Falls, ON,

12-13-2004 04:22:53




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 Re: gas powered cement mixer in reply to KIDbob, 12-12-2004 10:07:40  
That power estimate seems a mite high. My smaller electric mixer runs just fine on a 1/2 hp. Remember that you'll have to balance pulleys, and where the sprocket is now you'll need a big one, say a 12", and then maybe a 2 1/2 on the motor end. I'd start with a borrowed 1/2 hp and work my way up, as needed.



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