jack shaft pulley size. HELP!!

[frodo]

hello, i've been seeing on the net, that you go-cart guys have sharp pencils.
i need a little help, I have built a tumbler. for tumbling brass
I reload. and need shine-nee brass "bling-bling'
the tumbler turns to fast. its on steriods
it needs to be slowed down
its 3450 rpm. [ whirlpool dryer part # 279827] 1/3 hp spl 120/60 5.0 a
the drive pulley is a 1/2" pulley
the tumble drum is 6 1/2"
i think i need a jack shaft in between the 2 pullies[ drive/ drum] but need to know the size of the 2 jack shaft pulleys
in order to get the rpm to around 100
distance center to center of drive and drum is 12 1/2"
can ya'll help
http://http://s1357.photobucket.com/user/41frodos/slideshow/Photobucket%20Desktop%20-%20EDNA-PC

 

[frodo]

http://http://s1357.photobucket.com/user/41frodos/library/Photobucket%20Desktop%20-%20EDNA-PC

 

[Doc Sprocket]

If your motor turns 3450 and you need 100 RPM, that's an overall reduction of 34.5:1. You would be very hard pressed to do this with pulleys, even with a jackshaft. You're better to find a motor that turns a lot slower to begin with, or source some sort of reduction gearbox.

 

[frodo]

I was afraid of that answer.... truth is truth... what type of house hold appliance turns that slow? I have an extra 3/8 drill.....I HAD an extra 3/8 drill ! its variable too. ok thanks for the info. off to the shop...... 1590 thanks ! and 91

i went back to the net and found i was wrong. its 1750 rpm not 3400
is that doable?

 

[Doc Sprocket]

See PM, then we will continue.

 

[landuse]

That is doable. You will need reduction of 17. I will wait to see what toystory says before i elaborate.

 

[frodo]

toystory said it would take 2 jack shafts, thats 1 to many. the ribbed pulleys are 30 bucks a pop.
my math is screwed up. i figured 1-- 5 1/2" pulley and 1-- 2" pulley
but.. i skipped math class when susie q smilled at me!
thats the reason i asked ya'll for help