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#4
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Now comes the tricky part. Sand or grind the outer
edge of the stopper so it will move smoothly inside the 1" PVC. I use a bench grinder and rotate the pipe in my hands. Just remove a little at a time. If you mess it up just replace the stopper. Perfection here is really not necessary since the stopper will expand when air is applied. The stopper should not be a sloppy fit but should move freeley in the 1" PVC with very little resistance. |
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#5
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In one of the 1" caps drill a 7/8" hole.
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#6
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Unassembled Cylinder
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#7
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Glue the bottom cap on and drill and tap the side with
1/4" pipe threads. Insert brass compression fitting. Clean the inside making sure all debris from drilling and tapping is removed from the inside of the cylinder. Slide the stopper into the cylinder and glue or use small screws to secure the top cap. Glue a PVC coupling on the top of the 1/2" PVC to prevent the stopper from bottoming out on the brass compression fitting. This also allows L brackets to be screwed into the bottom. To prevent the cylinder from over extension use weed eater line attached to the bottom of your project through a hole at the top of the piston rod. |
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Mark's cylinder and washer valve.
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Do not use petroleum products to lubricate. The
rubber stopper will expand and bind. Use glycerine from the drug store. |
