another piston question

[kydavies]

im about to build my first coaxial piston valve and i was wondering if it is ok to have a small leak in the seal between the pilot and chamber (the piston will seal perfectly to the barrel). i know this will hamper the opening time of the piston but will it work if the piston isnt perfect

[Lockednloaded]

it has been said that the piston need to be snug enough not to fall out or turn, and loose enough to be able to push with one finger

[Crna Legija]

if the gap is 1/2mm that to much

[Technician1002]

If it rattles sideways the gap is too big. A proper piston will look like it would stick if given a chance. This pipe was sanded smooth and then the piston was very carefully machined down until it just fit inside. It worked like a charm until the chamber developed a leak at the other end.
This cannon is now retired.


The Mouse Musket breech. 2 inch chamber, 1 inch coaxial barrel, 1.25 inch valve seat (sealing surface) and 1.5 inch piston.

[kydavies]

k thanks il keep that in mind when i get around to building my piston

[clemsonguy1125]

Another trick is that if you shine a light through the barrel you shouldnt be able to see it from the back of the piston