Lightning wrote: Sunny Boy wrote:
Is that one inch conduit ? If so, 3/4 inch fits rather nicely inside it. You could make them into rotary sleeve valves by having 3/4 conduit inside the 1 inch.
Drill matching holes from the 1 inch into the 3/4 inch. With the 1 inch tubes fastened in place so they don't move, when the 3/4 inch tubes are turned they will start to close off the 1/4 inch holes because of the holes going out of alignment. That will restrict all the holes in the pipes equal amount at the same time.
Edit, ok, I see your using 1-1/4 inch. How snug does the 1 inch fit inside it ?
Awesome idea, some of my holes aren't in a perfect line due to the drill dancing around. But I understand your suggestion, its excellent since it would restrict each hole individually. But lining them up would be challenging
Yes, that's the nice thing about sleeve valves - ALL the feed holes adjust at the same rate keeping air feed adjustments consistent along the lengths of the pipes.
If the restriction is only at the end of the pipe, once past that restriction, if the air volumn going in is less that the total all the holes can flow, the air will take the path of least resistance and come out the holes closest to the outboard end.
Drill bit alignment should be easy. As long as the inner and outer pipe don't move while your drilling, the holes in the 1-1/4 pipe will act as a drill guide. Even if you go larger - say a 5/16 bit, it will compensate for any initial wandering of the bit.