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bigdogrod
10-19-2021, 03:20 PM
anybody have a link to some tiny hydro cylinders? like 3mm dia and 10 mm stroke? was thinking about making the tamiya tow truck work hands free
Zabco
10-19-2021, 06:12 PM
Give this site a look see: https://www.wpraez.de/shop2.0/index.php?cPath=20_24
Zabco
10-19-2021, 06:23 PM
I just ran across this site a few days ago and had not really looked it over till now. I see that they only ship to Europe so I'm afraid they won't be of much use after all. Sorry.
Lil Giants
10-20-2021, 11:23 AM
I got a small order coming from Fumotec within the next month; he might custom make those, how many do you want? Or you could direct order yourself from him too.
bigdogrod
10-20-2021, 11:44 AM
no idea on the actual size needed, just pondering if it could be done. i'd need boom lift, boom extension, stinger fold, stinger extension, wheel lift clamping, stabilizer extension. and i'f i'm thinking hydro, maybe get the winches too

more just curious of say a cylinder the diameter of a pen (like 5 or 6 mm) could even be made
Ben1272
12-30-2021, 12:13 PM
I saw where someone was using small pneumatic cylinders for the R/c aircraft landing gear door/canopy/speed flap, market. I think they needed some modification, but it did not look beyond reasonable. They had sourced theirs on Aliexpress, but I imagine yo might find them any number of places. Typically much smaller diamter than hydro-cyclinders. Also there is clippard pneumatics. They make all sorts of cylinders that might be re-purposed.
ddmckee54
12-30-2021, 01:52 PM
The small cylinders won't be too much of a problem, as long as you don't exceed the pressure rating of the seals you might even get by using a pneumatic cylinder in a hydro set-up. Most pneumatic cylinders intended for long term continuous use will have oilers added to keep the seals lubricated.

That being said, MOST of the pneumatic stuff that I have worked around is used at less than 100PSI - usually 60-80PSI max. At that pressure you're not going to get much actual work out of the small cylinder. If I've done my back of the napkin calculations correctly, a 5/16" cylinder (approximately 8mm) at 80PSI will give you about 6 pounds of push.

Physics doesn't always scale well, sometimes she's your friend, sometimes she's not - plan on electric winches.

Don