Cylinder travel limiter

[Chilly807]

I have a situation where I need to limit the extension of a cylinder from 44 inches to 36 inches overall length. Using a shorter cylinder isn't an option because of the required length when fully retracted.

My question is, is it as simple as machining an aluminum spacer to fit over the rod and inside the bore, with enough clearance that it won't restrict fluid flow?

Sean

 

[kennyd]

Yes, you can certainly do that. There are ones you can buy off-the-shelf to limit retraction also. Just be sure the spacer does not contact any seals in the gland.

 

[Craig Clayton]

Chilly807
Seeing that you are using the machining word, I would suggest brass collars, the above mentioned off-the-shelf keep the diameter to lenght a 1 to 1 ratio. Not one 8" collar.
I am a little confused because how can you pull back 44" but only extend 36". Got a pic
Craig Clayton
I heard that you had some rough weather.

 

[J_J]

I think he only wants to extend 36in of the 44in he has available, keeping the cyl mounts in the same position.

Outside stroke control. Clips on the rod, outside

 

[Chilly807]

JJ's got it right. I need to limit the extension of the cylinder to no more than 36" total, with no limiter it can go to 44" overall.

Sean

 

[J_J]

Just clip as many as those controls above as needed, and you don't take the cyl apart. There are other version of the limiters.

http://baileynet.com/index.php?id=31&productcategory=1000027

 

[rus_geek]

JJ, I think you've got it backwards. Those rings will limit the retracted length of the cylinder, instead of the extended length.

Chilly, could you switch to a 36" cylinder so you're using max extension and then limit the retraction with those collars instead? That way all the modification is outside the cylinder instead of inside.

-rus-

 

[wdchyd]

My question is, is it as simple as machining an aluminum spacer to fit over the rod and inside the bore, with enough clearance that it won't restrict fluid flow?

Sean

Yes, but you'll have to open up the cyl and yank apart to install......:thumbsup:

 

[J_J]

You are right. I was thinking outside the box today. those are retraction collars. Please forgive me.

But then again, he might want to retract it to 36 in total, and only use the rod from 36 in to 44 in for the operating mode.

If this cyl was controlled by a solenoid valve, it would be easy enough to place a tab on the shaft to operate a switch to break the current at the desired shaft position.

 

[Chilly807]

I think the ones in the picture are extension collars, but you don't have to remove the piston to install them. The cylinder still has to come apart, however.

I've been doing a little research this afternoon. As far as I can tell, there is no way to add anything external to this particular cylinder to prevent it from extending or retracting fully. The split collars will open up when the rod end contacts them, the clip won't withstand the force.

The cylinder I have is a 2 inch dia 18 inch Hy-Spec welded model, with steel tubes on each end for a 1 inch pin, not a clevis or flange mount. If it overextends it will bend the rod, however the retracted length is perfect. So I can either limit retraction or extension. With the rod fully retracted it is protected from the weather for storage, so I prefer to limit extension.

Sean