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O'Lane 04-18-2007 06:58 PM

Tapping Aluminum For Phantom Feed Tube...
 
Hey guys, got a machining question for you.

I'm in the middle of working on some projects which involve machining a new horizontal feed from Aluminum. I'll need to tap it to fit the Phantom's Feed Tube. I was looking around and saw some images of aluminum horizontal feeds. I noticed though that the threading on the Feed Tube is tappered the entire length of the threads, it appears to have a .8 Metric Pitch. How would I go about threading aluminum to fit the feed tube since the threading is tappered? What size threading is it? What tooling is needed? Thanks for the help.

O'Lane

jhyan 04-18-2007 07:32 PM

I could be wrong, but as I screwed a new tube into a phantom feedblock, I thought to myself that the delrin block was straight tapped, and that it gets tight as the widening tube goes further into the straight hole. I haven't measured the feed block though, so I can't say for sure.

O'Lane 04-18-2007 07:45 PM

That's what I'm thinking as well, that the feedblock is straight tapped, but I'd rather be safe than sorry...

PatG 04-18-2007 08:12 PM

From my understanding, the feedtubes on Phantoms are held in by friction. That is why the feedtubes are ribbed and the feedblock is ribbed. Hope this helps.

Pat

Fireball 04-18-2007 09:34 PM

The feedblock is ribbed from the aluminum biting into the delrin.

My sources tell me:

SC feed tube = 32tpi pitch that tapers from .805" out to .855" over a length of .9" (non-standard - can't make this one at home)

O'Lane 04-18-2007 09:41 PM

Alright, I may have to email CCI to see what I can pull from them, anyone else have any input. Possibly Rainman, saw this in wood surface finish thread, is that a Phantom Feed Tube...

http://rainman229.com/images/pumps/p...m%20stock5.jpg

O'Lane 04-18-2007 09:43 PM

Quote:

Originally Posted by PatG (Post 136928)
From my understanding, the feedtubes on Phantoms are held in by friction. That is why the feedtubes are ribbed and the feedblock is ribbed. Hope this helps.

Pat


If this is true, think it would be possible to oversize the hole in the feedblock and insert a ribbed delrin spacer that the feedtube threads into?

Rainman229 04-18-2007 09:47 PM

The setup on phantom feeds are like that for a few reasons. Biggest one is delrin is forgiving. Being the threads are so fine they will cut there own threads in the delrin. Creating a tight friction lock.
Also makes timing the threads not need so there no problems with ball sights lining up in the right spot. So matching a feed set would not be needed. ( think how a barrel threads on one marker alingins nice and then throw it on another marker and its off)

The same idea can be used with aluim. Only problem comes when you decided to take it a part. Once they go together they tend not to want to come apart.

Rainman229 04-18-2007 09:49 PM

Quote:

Originally Posted by O'Lane (Post 136981)
Alright, I may have to email CCI to see what I can pull from them, anyone else have any input. Possibly Rainman, saw this in wood surface finish thread, is that a Phantom Feed Tube...

http://rainman229.com/images/pumps/p...m%20stock5.jpg

yes thats a Phantom feed tube. The feed block has no threads it's slightly tappered and the tube go's in as it would a delrin block.

O'Lane 04-18-2007 09:52 PM

Quote:

Originally Posted by Rainman229 (Post 136987)
yes thats a Phantom feed tube. The feed block has no threads it's slightly tappered and the tube go's in as it would a delrin block.

How did you taper the hole, I pressume a lath? If so, wouldn't be feasible with what I'm working on, may have to oversize the hole and press fit a delrin spacer in there.


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