G'day brains trust
I'm trying to figure out a way to make/design something that will disengage a drive pulley from running a Baker Fan, some type of clutch arrangement.
So what I'm trying to achieve is an engine running, belt going from the drive pulley of the engine to the drive pulley of the Baker Fan.
Engine is running under load running the Baker Fan, I release some type of clutch mechanism that disengages the Baker Fan and the engine speeds up not under load.
Re-engage the clutch mechanism Baker Fan starts spinning and the engine is back under load.
I've given it a lot of thought but come up blank with a way to achieve this (with taking in my skill levels of being able to fabricate it) can anyone think of some type of mechanism that will work?
Hi Jim,
I remember many years ago operating then a very old lathe with a flat belt drive that had a clutch consisting of two pulleys side by side mounted on a shaft. One of the pulleys was fixed to the shaft the other was loose. By moving the shaft sideways the belt moved from turning the loose pulley onto the fixed pulley so engaging the drive. I think the gear drive for the head stock was on a spline so not effected by the movement of the shaft. Whether a similar system could be used with a tight round belt would work I don't know. The flat belt using this simple system being a little slack. A interesting problem.
Take care Tony.
Hi Jim,
I remember many years ago operating then a very old lathe with a flat belt drive that had a clutch consisting of two pulleys side by side mounted on a shaft. One of the pulleys was fixed to the shaft the other was loose. By moving the shaft sideways the belt moved from turning the loose pulley onto the fixed pulley so engaging the drive. I think the gear drive for the head stock was on a spline so not effected by the movement of the shaft. Whether a similar system could be used with a tight round belt would work I don't know. The flat belt using this simple system being a little slack. A interesting problem.
Take care Tony.
Thanks Tony my first lathe I could loosen a lever and the belt would slip.
Problem I'm having (in my head) to solve is say -
A is the engine pulley,
B is the 'clutch' and
C is the baker fan pulley I need to be able to disengage and re- engage
BI'm just totally stumped on how (even if its possible) on how to achieve this. I did think of two discs side by side, one with two protrusions and the other with two drills holes the same size as the protrusions and a lever to open and close the the two discs, I was thinking that I could do something along the lines of that, but it would be a pretty almight clunk to get it in 'gear' if the whole mechanism above makes the slightest sense.
Hell again Jim,
You might want to try what used to be used on old IC drive model racing cars, it consisted of a driven fixed loose pulley on the drive shaft another pulley splined or the like to the shaft with a spring pushing it against the loose pulley with a means of holding it off to disengage. A piece of cork is glued to one of the mating faces of the pulley. Basically the same as the old cone clutches that were used on cars. I hope this makes sense?
Take care Tony.
Just made this crude "Paint" drawing, how iīd do it...donīt know if that makes any sense Jim?
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I don't know if this video will help, but it's worth watching for the eye candy.
I believe it may be a cone clutch or a clutch similar to what Jan has drawn.
Also of interest is the flat belt shifter down on the tiny table saw.
https://youtu.be/o_GkSNw-kx4
For pure simplicity's sake, why not just have a belt tensioning idler pulley in the linkage? You could probably just use a weighted pivoting arm attached to the Baker fan with a pulley on the end to tension or slack your drive belt.
Would work perfectly Daniel!
I do think the KISS philosophy there will work way best in this case, as no parts in either end would need altering.
It will engage softly as the belt tightens, and not with a bang like it would on the Doll system shown above.
I'm on board for the idler pulley as an answer
and a simpler one is not to be found. To add,
my homemade mini-bikes back in the 1960's, all
with idler-pulleys, would say 'go for it!'.
Good luck,
Wayne
Thanks one and all for help, suggestions and drawings......really really much appreciated.
Daniel, any chance of just a thumbnail dipped in ink diagram just so I can get my head around what you mean and picture it?
This sounds good as it won't be another accessory as such for the engine to drive i.e it won't take away any of the already limited engine power I'm thinking?
Why not something like the D32 has ?
Why not something like the D32 has ?
I've been studying that mechanism Bruce.
Why not something like the D32 has ?
I've been studying that mechanism Bruce.
I always wanted to emulate the clutch system on an old wheel horse lawn mower with a horizontal shaft engine. I tried to find a video on YouTube but was unsuccessful.