Thanks for your additional comments, Ger21, and JimDawson!
You've converted me. I'll be running the tubing through the cable chain to a reservoir that sits outside of the machine frame. Right now I'm thinking about using 10mm OD, 6.5mm ID PU tubing, and 10mm push in fittings.
You guys are right about the pressure drop.
32mm diameter is approx 1.25 square inches
Let's say I run the Z at 400 IPM max
400 IPM x 1.25 in^2 x 2 (2 cylinders) = 1000 in^3/min = 0.58 cubic feet per min
I looked at a
few online calculators, and over a 15 foot length, the pressure drop is negligible (way less than one PSI). Someone please correct me if I made a mistake there. Also, I could use 8mm OD, 5mm ID, but the price is about the same, so I figure 10mm OD will be fine.
The fittings I'm looking at on aliexpress are "G" fittings which I assume is the same as BSP? If I use an old air compressor tank, I will need to find a 3/8 BSP (female) to 1/4 NPT (male) adaptor, but I assume those are available on EBay.
Actually what I plan on doing at this point is to use an old fire extinguisher as the air reservoir.