sprocket sizing (RPM's) 1

[huntersridge]

I posted this question earlier but I have some new information. I am setting up a "Tumbler" (4'w X 6'h)that will be turning at a speed of 18 RPM's. I will be powering this with a gearmotor with a 57:1 ratio which gives it an output speed of 29 RPM's. The gearmotor has a 1" shaft as well as the Tumbler "drive shaft". I need to go from 29 RPM's (output motor speed) down to 18 RPM's on the drum. What would I need as far as sprocket sizing on the motor and the drum??

The gearmotor will be sitting directly below the tumbler sprocket.The tumbler is just a 6' diameter wooden drum that revolves on a 1" shaft mounted in pillow block bearings.

 

[eromlignod]

Well, you could use sprockets of 18 teeth on the motor and 29 teeth on the drum. This would give you the perfect ratio.

Don
Kansas City

 

[diskullman]

Use a 1.6 to 1 ratio for sprockets, like 18 & 29, 10 & 16,15 & 24, 20& 32. If you want exact sprocket sizing with chain pitch, post the HP & Torque figures from the gearmotor, as well as both shaft sizes & center distance.

Russell Giuliano

 

[huntersridge]

1/2 HP gearmotor with 1089 in. pounds torque at full load. 30" center to center distance on 1" shafts (tumbler axle & motor).

 

[diskullman]

I would use a 40B15F1" & a 40B24F1" and #40 chain. This should give a sufficient service factor (actually a little overkill, but #40 sprockets & chain are usually very affordable & readily available. You can buy sprockets through Browning, UST, Boston, any Power Transmission distributor or Grainger or MSC.

Russell Giuliano