New toy, Need help

A

Archer Moon

Well-Known Member
Just got a new grinder, to me, for $30! Not the best, but with a little work, it will be good. The grinder is a rockwell with a 1"x42" belt. The motor is 1/2 horse at 3450 rpm. The shaft is 5/8" on both the motor and the drive wheel. The two shafts are about 12" apart. There is an interesting feture on this grinder. It has a stabliser for the platnum, a ball baring on a bar coming off the top wheel. Makes for a solid platnum!
Now here is where I need help. The pullies need to be replaced. I would like some one to tell me what size I need to get. I would like the belt to go slow enough to grind 5160 with very little spark. Where would I get the pullies and how much would they cost?

PB180131.jpg
 
here is a link to a site that has a program to determine the pulley size for each shaft to get a desired RPM, just plug in the numbers and it does the rest.
http://www.csgnetwork.com/pulleybeltcalc.html you just put in a pulley dia. for the drive, one for the driven, and the motor RPM, hope that this helps. Buy the way, that is the exact kind of grinder that I started out using, the platen on mine was awful.
 
Just wanted to point out that Keith was the one that actually mentioned the pulleys... I only felt obliged to comment because he was talking about 5160...


(And Btw James, I have a cherry fighter handle sanded out and will be using tigerwood on the next one...) :D
 
using the pulleys shown, and the calculator in my first post, and putting the belt in the 2" pulley at the motor, and the 4" pulley at the grinder shaft, your shaft speed would be reduced to 1725 RPM when using a 3450 RPM motor. Reverse the pulley arrangement and you get 6900 RPM, and using the 3" at both you get 3450 RPM. And I wouldn't know what speed would grind 5160 or any other steel with little or no spark, I would guess that 1750 may get close, but the slower the speed, the less spark for sure. Hope this helps out.
 
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