jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
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Post by jamesp on Mar 12, 2020 13:19:45 GMT -5
This works well. Running a 6" I.D. barrel with an 8" I.D. barrel. The top edge of the cap hits on the nose cone of the larger barrel. The shaft spacing was adjusted at construction to create this situation.
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Post by greig on Mar 12, 2020 13:37:17 GMT -5
Makes sense. Will you get extra wear on your barrels because they spin at different speeds? The solution to that is to separate them with some kind of guide.
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EricD
Cave Dweller
High in the Mountains
Member since November 2019
Posts: 1,142
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Post by EricD on Mar 12, 2020 17:31:06 GMT -5
Makes sense. Will you get extra wear on your barrels because they spin at different speeds? The solution to that is to separate them with some kind of guide. He will get a ton of wear on the fernco cap, but everywhere else should be fine
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
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Post by jamesp on Mar 13, 2020 5:21:32 GMT -5
greig EricDI'd thought the caps would wear too. Switch to full screen video and observe the gap between the barrels and the the gap between the left and only guide roll. The tumbler is sitting at a slant to keep both barrels in center and steering slightly to the left against the guide roller. 'Fernco' is cast into the Fernco cap at the point of contact have never worn off. The barrels are HDPE and is like bearing material similar to teflon and is not fond of wearing, slick too. Not to mention the barrels are placed on the shafts so they steer into each other negating most axial forces. Fernco has a competitor that makes a much stretchier cap of softer thinner rubber. (at Home D. or Lowes). It barely lasts a year due to wearing from the inside out but is easy to install on cold days. 6" Fernco caps on the 8" black barrels must be a 1/4" thick, 4" Fernco caps on the 6" PVC barrels are about 3/16" thick. Some of the 4" Fernco brand caps have been in service with SiC 30 and 46 at 40 to 60 rpm for over 6 years and are thinning finally from the inside.
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EricD
Cave Dweller
High in the Mountains
Member since November 2019
Posts: 1,142
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Post by EricD on Mar 13, 2020 8:19:08 GMT -5
That's amazing. Yeah I guess HDPE is pretty slick, isn't it. One of my favorite uses for it is for skid plates on vehicles that need to be able to slide over boulders easily Without it, the rock pretty much just "grabs" the metal undercarriage and you stop!
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
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Post by jamesp on Mar 13, 2020 10:03:45 GMT -5
That's amazing. Yeah I guess HDPE is pretty slick, isn't it. One of my favorite uses for it is for skid plates on vehicles that need to be able to slide over boulders easily Without it, the rock pretty much just "grabs" the metal undercarriage and you stop!
Most HDPE pipe gets used in mines to transport highly abrasive mine slurry full of ore to a processing or shipping location. So the pipe walls get abraded night and day handling abrasives at 100 to 200 psi. The blowouts usually occur at the bends in the pipe where wear is highest. Blow outs are extremely dangerous due to heavy pipe being slung around like a garden hose running open. Another analogy - aluminum canoe bottom dragging rocks at a shoal verses an HDPE canoe sliding over them.
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