Questions on SAE J514 ports

[cheechthechi]

Hi all,

I'm working on a new project where we have an AN-4 port in our product. The AN spec is now covered by SAE J514, and I have been trying to find a port cutting tool to give to our machinist to make this port. All the port cutting tools that I have found so far that claim to match the SAE J514 spec have a 30 degree seat angle instead of the 37 degree angle that the J514 specification calls out. After calling the two different tool manufacuturers I have been told that a tool with the 37 degree seat angle would be a special order part with a 5 to 6 week lead time. I need to have this part made as soon as possible and do not want to wait the 5 to 6 weeks just for a porting tool.

Can anyone explain to me why these tool cutters specificty both the SAE J514 and SAE J1926 for the same tool? Also is there a separate specification for the port dimensions for J514 fittings? I recently obtained a copy of the J514 spec and only fitting dimensions are given. I'm a recently graduated engineer and this is the first time my company is doing a fluid power project, so any help or insight would be greatly appreicated!

Thanks,

Ramitha

 

[MikeHalloran]

The 37 degree angle has nothing to do with the o-ring seat; it has to do with the interface to the flared tubing.

The o-ring seat comprises a 45 degree half-angle bevel, and for the smaller sizes, a 12 degree half-angle bevel, plus a spotface and a reamer or a pilot.

The first time I specified these ports, for a manifold, I put the whole spec on my drawing, and our machinists made the bevels with homemade flycutters. I asked them why they didn't buy the spotface/countersink tools, and they admitted they didn't know about them; they'd only worked with NPT crap before I got there.

Just buy the cutters.




Mike Halloran
Pembroke Pines, FL, USA

 

[cheechthechi]

Thanks Mike for the reply. For future reference for anyone who sees this I ended up having the tool made. I made a tool profile based on the SAE J514 standard and sent it off to a local tool grinder. Ended up costing us around $130 with a 10 day turn around time.