PORT TOOLS

[HEAVY METAL]

SHOULD YOU RUN THE TAP FIRST THEN THE PORT TOOL OR THE OTHER WAY AROUND. THANKS HEAVY

[crazy^millman]

I alway run the tap last. If you read the ANSI for post this is the process you are suppose to follow.

 

HTH

[HEAVY METAL]

SOUNDS GOOD TO ME MILLMAN

FOUND AN OLD PROGRAM AND THAT WAS THE WAY I DID IT -TAP LAST. JUST BEEN AWHILE

 

 

THANK YOU

HAVE GOOD WEEKEND

[chopsley]

Crazy Millman is right on. I've done lots of porting and the tap is always last. Seems to me that the threads would get rolled over if you ran the porting tool last. I never knew that the sequence was in the ANSI specs. Learn something everyday.

[crazy^millman]

Well when you got to do that Sigma Six and BlackBelt stuff you learn alot of things. Sometimes a real pian but part of the process so you roll with the punches.

[TheePres]

Im sure people that wrote the book know from hands on experience the best methods to use..

[chopsley]

I always give the porting tool a G04 dwell for a couple of revs just to be sure The sealing surface is smooth and flat. A G82 would work as well I suppose but porting tools are sort of differant critters. I usually have them touch off from the large spotface dia. How do you superstars handle this?

[Matt Berube at Ferron Mold]

Pardon my ignorance, fellas...

 

What is a porting tool ? Are we talking about engine heads here ?

 

Just curious...

[chris m]

Matt

 

1) The ports they are talking about are typically for fluid connections (hydraulic, fuel, cooling fluids, oil, etc) and often have 'standard' configurations. If you look in your MSC book under 'port tools' or 'porting tools' you should probably see what they're talking about.

 

2) Are you any relation to Mike Berube, esteemed salesman for The Robert E. MOrris Company?

 

C

[mrainey]

I wasn't aware of a written procedure, but have always used the porting tool to size the minor diameter before tapping (hole drilled slightly undersize). I would think that would give optimal concentricity between the thread pitch diameter and the diameters formed by the porting tool.

[chopsley]

Mr. mrainey, you are correct sir. That is how I understand it as well.

[cblythe3d]

Depending on the hydraulic port, AN, SAE, ISO, MS, NASA, Rosan etc they all have published but obscure standards. Most aircraft manufacturers have their own often detailed specifications and procedures.

 

If a spec is called out the porting tool manufacturer will usually fax you a copy.

 

 

If you are doing a lot of them or cutting some uncoperative material like nastalloy or inconel a form drill really helps. Reducing operation count and the load on your slow, expensive, and if brazed carbide, fragile porting tool at the bottom.

 

In aluminum 3 steps form drill, port, then tap

Steel and exotics, stub drill undersize, semi finish, finish the port, then tap. Use of a sulpher/chlorine extreme pressure lube and high end spiral flute tap for the last two operations insures success.

 

Most of the way down the hole you can get a pretty good feed rate where the tool is at most reaming. But at the bottom a really slow feed when the tool is acting as a counterbore and dwell (as was suggested) can be critical to achieve the required surface finish for sealing at the bottom.

 

After all the job I save might be my own

[Matt Berube at Ferron Mold]

Chris,

 

Thanks for the explanation.

 

No relation to the esteemed salesman.