View Full Version : Cheap gear reduction, in the 20-80:1 range?
Billy Golightly
07-03-2009, 02:44 PM
Does anyone have some ideas on a cheap way to get me anywhere from 20:1, through 80:1 gear reduction? I'd prefer somewhere in the 20-25 range, but I can deal with more. I've got a 5hp 220v input motor turning 1750rpm. I don't have a smaller motor but I wouldn't object to using one if it was cheap. I need about a 3/5 horse, horse and a half max ouput power. The 5 horse on it now is overkill. I've seen the gear reduction boxes on ebay, but for the power i'm needing its just WAAAAAAY to expensive.
How about the tranny out of a riding lawnmower or tiller. should work nicely and be a bit adjustable to your liking. Maybe find a beat up riding lawnmower somewhere.
Name Brand
07-03-2009, 05:11 PM
Cannibalize the belt drive system out of a big drillpress. The ones made for drilling metal (versus wood) will likely have much slower operating speeds available.
What are you working on?
Billy Golightly
07-03-2009, 06:05 PM
band saw with a 30inch wheel diameter that needs to be able to cut metal. I can do it with shafts and pulley's, but to get the blade speed down to where it needs to be, its going to have to be reduced like 4 times using 4-15inch pulleys.
brapp
07-03-2009, 06:33 PM
i have a big ass horizontal bandsaw ready to roll just requires 5+hp 3 phase converter i dont have the power to run it lol
hondahaulic
07-04-2009, 02:19 AM
if you could find a small gearbox that uses a worm gear to drive a large gear it should work well and be compact. Ive seen them on smaller metal band saws, but cant think of much else where they are used.
Thorpe
07-04-2009, 02:23 PM
http://www.grainger.com/Grainger/wwg/productIndex.shtml?operator=retrieveProdLevel1Inde x&prodLevelList=Pulley%257CPulleys%252C&prod_level_selected=Pulley
Dirtcrasher
07-04-2009, 02:43 PM
I'm thinking riding lawnmower gear box :D
Of course you could make a simple drive with a worm gear and worm wheel, but you'll need some thrust washers or thrust bearings.
Call a bearing shop, give them some shaft sizes you can deal with and a ratio you want and maybe that would help? McMaster sells that crap individually.
Billy Golightly
07-04-2009, 11:50 PM
I can buy pulleys and put them on shafts, I know how to do that. But even with pulley's I'll need a 4 inch to 15 inch wheel FOUR TIMES to get the correct reduction. Thats about $450-$500 in belt pulleys.
Now...a home made worm gear box...that would probably work.
brapp
07-05-2009, 11:39 AM
hell for 500 bucks you cna drive up her ean dbuy my bandsaw i am gonna take a look at the gear reduction set up we have on the electric motor for the pipebender we built.
joshco84
07-05-2009, 11:00 PM
go to surpluscenter.com and look under power transmission. They have lots of gear reduction stuff, and lots under 100 for what you are looking for.
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