Positioning of Robart Air Cylinder With Tailwheel Assy
12-31-2015, 05:10 PM
#1
Positioning of Robart Air Cylinder With Tailwheel Assy
Please help. No matter where I put the Robart air cylinder (2 1/8" stroke) or even the larger Robart air cylinder (2 1/2" stroke), I can not position it to where the full up or full down is just right. I am trying to install the air cylinder to the Sierra tail wheel assembly. When I get the cylinder to extend to the full position, it works great, however when I retract the gear, it will rip the support board that the air cylinder is attached to, out of it position and vice-versa. What am I doing wrong. Am I using the wrong air cylinder (Robart vs. Sierra Manufacturing). Please help. Thanks Chic
01-01-2016, 04:22 AM
#2
My Feedback: (11)
It sounds like you have more travel then needed. To eliminate the extra travel add a sleeve over the air cylinder shaft and a washer at the outer end to cap the travel. I actually used a piece of nirod I split so I could snap it on and off as I adjusted the length of travel. Once the length is figured out you can replace the sleeve with one that is stronger if you like.
Let me know if you need a picture.
Matt
Let me know if you need a picture.
Matt
01-01-2016, 04:56 AM
#3
My Feedback: (11)
Pictures
In the first 2 pictures I show the full travel of the air cylinder. .8" - .2" or about .6"
I then added a nut and 2 washers.
And finally the sleeve. The sleeve is about .38" now my travel is .8" - .38" or about .42"
Once you get the travel required you can replace the plastic sleeve with a brass tube if you like.
Matt
In the first 2 pictures I show the full travel of the air cylinder. .8" - .2" or about .6"
I then added a nut and 2 washers.
And finally the sleeve. The sleeve is about .38" now my travel is .8" - .38" or about .42"
Once you get the travel required you can replace the plastic sleeve with a brass tube if you like.
Matt
01-06-2016, 05:25 AM
#5
I wouldn't be soldering the threaded rod into the shaft like that. Just the heat alone will damage the o-ring and will cause a leak in the cylinder.
Use RC-56 canopy glue as a thread locker on it.It will be easier to take apart in the future if it's needed.
I would just use a wheel collar as a stop for adjusting the travel of the shaft. You can see i have used this set-up on the cylinder of my speed board.
Use RC-56 canopy glue as a thread locker on it.It will be easier to take apart in the future if it's needed.
I would just use a wheel collar as a stop for adjusting the travel of the shaft. You can see i have used this set-up on the cylinder of my speed board.
Last edited by Greg Wright; 01-06-2016 at 09:23 AM.
01-06-2016, 11:03 AM
#6
Excellent idea Greg. I did not go the solder route, instead I used a piece of brass tubing that I cut to length and then tried to squeeze it around the piston rod. It works but I can't squeeze the brass tube really close to being sealed around the rod. Wish I could use wheel collars.
