Post by connrock on Sept 5, 2005 9:37:33 GMT -5
Pho,
I hope you don't mind my 2 cents but I think by using the rim you're defeating the whole "tumbling " process.
The whole idea is to have the rocks tumble over just like a wave hitting the shore.I don't think this is happening in the tire because the rocks are hitting the rim and not letting them "tumble".
The reason the plywood seals didn't work is because you can't create enough force between the plywood and the tire with the method you used.
Ron hit on a good point back a while and I think if you refine his idea a tad you can stop your leak problem.
The reason the tumbler isn't leaking now is that the air pressure is applying the same amount of "force" around the entire rim and tire.This "force" is measured in PSI or Pounds Per Square Inch.I don't know how much air pressure you pumped in the tire but lets say it's 10 PSI.This means that every square inch of "seal" area you have has got 10 pounds of "force" pushing against it.If you total up the amount of square inches the inside face of the rim you'll find that you have a very large surface area and every square inch has 10 pounds of "force" pushing against it!
If you can imagine having 10 pounds of weight on every square inch of surface area of the rim it would be quite heavy!
What you have to do is create the same amount of "force" mechanically.This is why your last attempt failed.You were 1/2 way there though!!
As they say,,,,One picture is worth 1000 words. LOL
This is a picture of a "test plug" that is used by plumbers to test domestic drains in homes to make sure there are no leaks before hiding some of the drains behind walls,etc.
The 3 main pieces you'd be concerned with are:
The "back plate" which would create the seal on the inside of your tire.
The "rubber seal" which in your case would be the tire itself.
The "outer plate" with wing nut.
What you want to do is exactly the same principle as if you were using the "test plug".You want to "sandwich" the tire between 2 surfaces.This will give you the "force" needed to create a seal.
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My thoughts are to take 4 pieces of 3/4" plywood,2 for each side. Cut 4 round pieces big enough to overlap the "rim" of the tire.Not the metal rim,the rubber rim.Make sure they are big enough in diameter to make a good seal.
Drill a clearance hole a tad bigger then the size of the threaded rod you're using.DO NOT drill these holes too big!
Cut 2 of the pieces in 1/2 and bolt on 2 strong hinges so the plywood will open and close like a butterfly's wings.This will let you fit the plywood inside the tire.
Cut 4 pieces of 1/8" gasket rubber the smae size as the round pieces of plywood and coat the areas of the rubber and the plywood that will make the "seal" with Elmers Rubber Cement.Let the cement dry on both surfaces and carefully stick them together as if you were installing wallpaper.Make sure you squeeze out all of the air.
On the outer plywood,gasket you can do the same.
When you're ready to put everything together you can apply the cement to the rim of the tire and the part of the gasket the hits the rubber rim.
OOPS forget,,,Yu'll have to punch or drill neat holes through the rubber gaskets.
I think you can see where I'm going here??
One set of the plywood/gasket combination can be left on permanently but the other will have to be able to be taken off and on to load,check and clean the tire.
If you can get hold of 4 pieces of 1/8" plate about 5"-6" square (or larger) to use as "washers" it would be great.If not you'll have to use 1/2" "cut washers".
If you have a problem with the "inside" nuts turning when you are tightening the outer nut,try using "nylock" nuts on the inside.
Of course if you could make the whole thing out of metal it would be great!!
Whewwww!! Lotsa 2 finger typing!! LOL
I "think" I got it right and I hope I'm not wasting your time.
Just my thoughts on it.
Good luck with whatever you decide.
Tom
I hope you don't mind my 2 cents but I think by using the rim you're defeating the whole "tumbling " process.
The whole idea is to have the rocks tumble over just like a wave hitting the shore.I don't think this is happening in the tire because the rocks are hitting the rim and not letting them "tumble".
The reason the plywood seals didn't work is because you can't create enough force between the plywood and the tire with the method you used.
Ron hit on a good point back a while and I think if you refine his idea a tad you can stop your leak problem.
The reason the tumbler isn't leaking now is that the air pressure is applying the same amount of "force" around the entire rim and tire.This "force" is measured in PSI or Pounds Per Square Inch.I don't know how much air pressure you pumped in the tire but lets say it's 10 PSI.This means that every square inch of "seal" area you have has got 10 pounds of "force" pushing against it.If you total up the amount of square inches the inside face of the rim you'll find that you have a very large surface area and every square inch has 10 pounds of "force" pushing against it!
If you can imagine having 10 pounds of weight on every square inch of surface area of the rim it would be quite heavy!
What you have to do is create the same amount of "force" mechanically.This is why your last attempt failed.You were 1/2 way there though!!
As they say,,,,One picture is worth 1000 words. LOL
This is a picture of a "test plug" that is used by plumbers to test domestic drains in homes to make sure there are no leaks before hiding some of the drains behind walls,etc.
The 3 main pieces you'd be concerned with are:
The "back plate" which would create the seal on the inside of your tire.
The "rubber seal" which in your case would be the tire itself.
The "outer plate" with wing nut.
What you want to do is exactly the same principle as if you were using the "test plug".You want to "sandwich" the tire between 2 surfaces.This will give you the "force" needed to create a seal.
-----------------------------------------------------------------------
My thoughts are to take 4 pieces of 3/4" plywood,2 for each side. Cut 4 round pieces big enough to overlap the "rim" of the tire.Not the metal rim,the rubber rim.Make sure they are big enough in diameter to make a good seal.
Drill a clearance hole a tad bigger then the size of the threaded rod you're using.DO NOT drill these holes too big!
Cut 2 of the pieces in 1/2 and bolt on 2 strong hinges so the plywood will open and close like a butterfly's wings.This will let you fit the plywood inside the tire.
Cut 4 pieces of 1/8" gasket rubber the smae size as the round pieces of plywood and coat the areas of the rubber and the plywood that will make the "seal" with Elmers Rubber Cement.Let the cement dry on both surfaces and carefully stick them together as if you were installing wallpaper.Make sure you squeeze out all of the air.
On the outer plywood,gasket you can do the same.
When you're ready to put everything together you can apply the cement to the rim of the tire and the part of the gasket the hits the rubber rim.
OOPS forget,,,Yu'll have to punch or drill neat holes through the rubber gaskets.
I think you can see where I'm going here??
One set of the plywood/gasket combination can be left on permanently but the other will have to be able to be taken off and on to load,check and clean the tire.
If you can get hold of 4 pieces of 1/8" plate about 5"-6" square (or larger) to use as "washers" it would be great.If not you'll have to use 1/2" "cut washers".
If you have a problem with the "inside" nuts turning when you are tightening the outer nut,try using "nylock" nuts on the inside.
Of course if you could make the whole thing out of metal it would be great!!
Whewwww!! Lotsa 2 finger typing!! LOL
I "think" I got it right and I hope I'm not wasting your time.
Just my thoughts on it.
Good luck with whatever you decide.
Tom
