Help understanding this pneumatic connection.
Help understanding this pneumatic connection.
(OP)
Howdy all,
I'm designing the tooling to test a pneumatic motor and I'm stumped by this connection in the pictures below. It's a 2.25" OD with two grooves. The first grove, the larger one I thought was an O-ring gland, but it's a bit narrow at .091 inch and way too deep at .125 inch. The second, smaller groove is just .050 inch wide and .080 inch deep. I designed a connection that "works" using a couple stacked O-rings (size 033) and uses the narrow slot to fit some machined L-angles with bolts to hold the attachment sleeve in place. I'm just not happy with my design and I might make a better connector if I knew how this connector is supposed to work. This is for the pneumatic actuator motor on a 747 leading edge flap drive.
Anyone familiar with the mating connector that matches this port?
Thanks,
-Kirby

I'm designing the tooling to test a pneumatic motor and I'm stumped by this connection in the pictures below. It's a 2.25" OD with two grooves. The first grove, the larger one I thought was an O-ring gland, but it's a bit narrow at .091 inch and way too deep at .125 inch. The second, smaller groove is just .050 inch wide and .080 inch deep. I designed a connection that "works" using a couple stacked O-rings (size 033) and uses the narrow slot to fit some machined L-angles with bolts to hold the attachment sleeve in place. I'm just not happy with my design and I might make a better connector if I knew how this connector is supposed to work. This is for the pneumatic actuator motor on a 747 leading edge flap drive.
Anyone familiar with the mating connector that matches this port?
Thanks,
-Kirby


Kirby Wilkerson
Remember, first define the problem, then solve it.
RE: Help understanding this pneumatic connection.
RE: Help understanding this pneumatic connection.
another day in paradise, or is paradise one day closer ?
RE: Help understanding this pneumatic connection.
I think if I was going to do this again I would fab the mating part to receive a flat 'U' shaped bracket that goes in the narrow slot like Compositepro was thinking of.
rb1957,
I wish I knew, that was my original problem. like there's a plan to hook this is up and I don't know what it's supposed to look like. It's 46 psi air.
Thanks all,
-Kirby
Kirby Wilkerson
Remember, first define the problem, then solve it.
RE: Help understanding this pneumatic connection.
RE: Help understanding this pneumatic connection.
The top picture makes it look like the are three rings but the second one only two rings?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Help understanding this pneumatic connection.
The first groove looks too deep for o-rings but the service may be too hot or move too quickly or too little lubrication for O-rings to work there anyway. If it still needs to seal, then something akin to a piston ring may be what you're looking at.
Why the heck don't you know everything about this assembly down to the seals, packers, fasteners and mating parts? Don't you have a CMM? If there is any hope of reassembling this actuator and recertifying the repaired unit, then it should be safe to assume that you're working with a component overhaul shop with the requisite tools and repair data to deal with this. From that, I can infer that somebody is NOT in the dark about how this part works, so you should find them and have a chat.
RE: Help understanding this pneumatic connection.
There are two grooves that you can see in both pictures. The third groove-like feature is just the machined stub of the fitting which in the second picture is mostly covered by weld bead.
WindWright,
This is the part we have in and what we're looking at is the opening where it connects to the aircraft. I don't have the aircraft (a 747), so I can't walk over and look at how this connection works or what the mating part is. I could try and find the AMM which probably has details about installation and removal, but all I have is the CMM which doesn't detail external parts. So my point in posting here is to ask if people are familiar with this type of connection and clue me in as to how it works. This is a new repair part development, so we're learning it.
As to the damaged edges of the groove, I think this groove is used to hold a retaining clip which is why it gets dinged up. The damage is less than .005 inches and we will ensure it meets the CMM airworthyness requirements before we certify it.
Thank you all for your feedback.
-Kirby
Kirby Wilkerson
Remember, first define the problem, then solve it.
RE: Help understanding this pneumatic connection.
RE: Help understanding this pneumatic connection.
-Kirby
Kirby Wilkerson
Remember, first define the problem, then solve it.