Specifying an SAE port (J1926) - drawing callout

[BowTied]

I posted this in the piping forum and was advised to post this here...

Hello all:

I did a search and did not find what I was wanted, I think this is a simple question: I am createing a drawing where a -8 threaded fitting will be installed and I need to specify to the machine shop what the machined hole will be. Is it as simple as a leader with "SAE J1926 -8"? I believe there is a tool the machine shop purchases to create these ports or at least rough it out and I would like to properly specify the port. Or do I need to specify all the machining details like here: (

http://www.inserta.com/PDF/AI-STR-THD-PORT-DIM.pdf).

Thanks for the help.
Ron

 

[MikeHalloran]

Once upon a time, I specified the details, and the shop made the ports correctly... but they did it the hard way. Just specifying the port by reference without dimensions would have caused them to look it up, or ask someone, e.g. me, and they would have found out that the proper counterbores are available from stock.



Mike Halloran
Pembroke Pines, FL, USA

 

[hydtools]

Here you go:

http://www.inserta.com/PDF/AI-STR-THD-PORT-DIM.pdf

You can also make or buy porting tools to these port forms so that the first operation is the through drill. Then the porting tool cuts the final port shape. The final tool is the threading tap.

Ted

 

[BowTied]

Thanks for the replies. I think I did not explain myself very well, or this question is so novice it would be assumed obvious (I have simply never needed to specify this before). I just want to know exactly how to specify the port callout on the drawing. Sorry for the rudimentary question. Please see the attached examples.

 

[hydtools]

Specify the through hole and port in order of shop process to create the feature. e.g. .375 dia. thru, SAE -8 port.

How much you put into the port description depends on your shop's understanding of what you want. Is the manufacturing shop your own or an outside shop? Does the shop know what a -8 port is? Is the port referenced to the finished surface or some other required surface? Concentricity of the port to the fluid passage is implied. Is that what you need or want? Is the common fluid passage size acceptable to your design or do you want a passage larger or smaller?

Specify as much as is necessary for you to get what you require from the shop producing the feature.

Ted

 

[BowTied]

Thanks Ted. This to an external machine shop and could be quoted anywhere from here to China. I just wanted to ensure that I was creating a port callout on a drawing that was to a known convention without being redundant or double specifying or plain confusing.

It seems then there is no convention in the form of the callout for an SAE port and I simply need to specify it as an SAE -8 and put in the notes that it is J1926 and be done with it. I have likley over thought the whole thing. I appreciate the help Ted et al.
Ron