Parts tumbler

[Bert]

careful you might end up calling some bondage place

WOW!! Looks like you and Anti-Gmaw have something in common after all !!! (same mindset)

[Anti-GMAW]

WOW!! Looks like you and Anti-Gmaw have something in common after all !!! (same mindset)

Hey! Are you waching through my windows!?!

[Anti-GMAW]

And the tumbling parts are quiet?


Sorry just had to ask.

No, but why make it any louder than neccesary?

[Bert]

Hey! Are you waching through my windows!?!

Nope, just heard the ambulance, poked my head out, and saw them stopping at your house...Cops said you were screaming, then you passed out unconcious...
I came over and told the cops, don't bother...its normal for him

[kcstott]

I am in the process of building a parts tumbler measuring 36" long by 12" diameter. It will be powdered by a gas engine and chain driven, what I need is the drive sproket and driven sproket sizes.
I would appreciate any help.

Troye

You need a gear box or something because a direct drive chain or belt would be one heck of a large driven gear. if you can get the motor to run @2000 rpm under load then a 10:1 ratio would be 200 rpm I'd say thats a wee bit fast. I would guess about 100 to 150 rpm would be fine.
here's the formula
RPM of motor / desired RPM of tumbler = ratio between drive and driven unit.
2000/150=13.3333...
So if you have a 3" gear on the motor you would need a gear 13.333 times larger on the tumbler or about 40" This is why I say a gear box. Worm drives start at 10:1 and go up from there.

Have you thought of using a vibe set up
Motor could power this at full RPM just set up a counter weight and adjust to get desired effect.

[arvidj]

You need a gear box or something because a direct drive chain or belt would be one heck of a large driven gear. if you can get the motor to run @2000 rpm under load then a 10:1 ratio would be 200 rpm I'd say thats a wee bit fast. I would guess about 100 to 150 rpm would be fine.
here's the formula
RPM of motor / desired RPM of tumbler = ratio between drive and driven unit.
2000/150=13.3333...
So if you have a 3" gear on the motor you would need a gear 13.333 times larger on the tumbler or about 40" This is why I say a gear box. Worm drives start at 10:1 and go up from there.

Could he take the "final drive ratio" into consideration? If it is a 12 inch drum and it is sitting on 4 inch drive rollers [just to start someplace], then it would appear as though he has 3:1 there. Assuming the overall ratio would need to be 13.333:1 - or greater, then a 5:1 ratio between the motor and the drive roller would seem to get about 15:1 overall. And the 5:1 at the motor might be easier to come by - larger motor pully and smaller driven pully than the 13:1 would require.

Or am I missing a salient point?

Arvid

[tnjind]

Could you use the drum itself as the driven pulley?

[monte55]

If you try to turn an unbalanced drum at 150-200 rpm, it better be nailed down real good. I'd expect the media and parts to cling to the outside walls due to outward forces. Not much cleaning action that way.

[kcstott]

yes you could use the drum as part of the gearing you know with a belt drive or just dead weight on rollers and yes the difference between the drum and rollers would be your final drive ratio.


Monte
150 to 200 rpm is slow it's about as fast as a home clothes dryer. Granted the slower the better in terms of safety but you still want the parts and medial to roll up the wall of the drum and fall over on itself better yet get a VFD and a three phase motor then just dial in the frequency you desire to get the correct speed.

[monte55]

yes you could use the drum as part of the gearing you know with a belt drive or just dead weight on rollers and yes the difference between the drum and rollers would be your final drive ratio.


Monte
150 to 200 rpm is slow it's about as fast as a home clothes dryer. Granted the slower the better in terms of safety but you still want the parts and medial to roll up the wall of the drum and fall over on itself better yet get a VFD and a three phase motor then just dial in the frequency you desire to get the correct speed.

I don't know what kind of dryer you have but mine travels at 48 rpm. Now if I
increase the speed times 3-4 times, the clothes would be stuck to the drum walls.