Not too long ago a point was made that a printed surface wouldn't work with an O-ring type seal.  I designed this model to test this point on a small scale.  It should be able to print with out any support structure, that is why the long funnel shapes.   The cap with the hose barb fits on top of the "tank" where the O-ring fits in the groove.  The barb should fit a 1/2" ID hose.  The O-ring size is 1"OD x 3/4"ID x 1/8". I would print this with 100% infill.
[attachment=687][attachment=688][attachment=689]
The test I'm imagining is a hose attached to the barb, then a T fitting with a pressure gauge.  From the T fitting, to a shut off valve, then to a source of compressed air.  The test would be first tried under water to watch for bubbles from either the O-ring, or defects in the printed body.  If that all goes well, a design with a few bolts holding the pieces together may allow higher test pressures.  I'm not going that route for now because I don't want bits of PLA embedded into my flesh.:D

I've attatched the Sketchup file and the two STL files.:cool:[attachment=686]

Nate

Quote from firepinto on January 12th, 2012, 04:42 PM

Not too long ago a point was made that a printed surface wouldn't work with an O-ring type seal.  I designed this model to test this point on a small scale.  It should be able to print with out any support structure, that is why the long funnel shapes.   The cap with the hose barb fits on top of the "tank" where the O-ring fits in the groove.  The barb should fit a 1/2" ID hose.  The O-ring size is 1"OD x 3/4"ID x 1/8". I would print this with 100% infill.

The test I'm imagining is a hose attached to the barb, then a T fitting with a pressure gauge.  From the T fitting, to a shut off valve, then to a source of compressed air.  The test would be first tried under water to watch for bubbles from either the O-ring, or defects in the printed body.  If that all goes well, a design with a few bolts holding the pieces together may allow higher test pressures.  I'm not going that route for now because I don't want bits of PLA embedded into my flesh.:D

I've attatched the Sketchup file and the two STL files.:cool:

Nate

cool nate! looking forward to seeing that!

i would say if you align the " flats " with each other... it may work just fine?

~Russ

Quote from ~Russ/Rwg42985 on January 13th, 2012, 01:45 AM

Quote from firepinto on January 12th, 2012, 04:42 PM

Not too long ago a point was made that a printed surface wouldn't work with an O-ring type seal.  I designed this model to test this point on a small scale.  It should be able to print with out any support structure, that is why the long funnel shapes.   The cap with the hose barb fits on top of the "tank" where the O-ring fits in the groove.  The barb should fit a 1/2" ID hose.  The O-ring size is 1"OD x 3/4"ID x 1/8". I would print this with 100% infill.

The test I'm imagining is a hose attached to the barb, then a T fitting with a pressure gauge.  From the T fitting, to a shut off valve, then to a source of compressed air.  The test would be first tried under water to watch for bubbles from either the O-ring, or defects in the printed body.  If that all goes well, a design with a few bolts holding the pieces together may allow higher test pressures.  I'm not going that route for now because I don't want bits of PLA embedded into my flesh.:D

I've attatched the Sketchup file and the two STL files.:cool:

Nate

cool nate! looking forward to seeing that!

i would say if you align the " flats " with each other... it may work just fine?

~Russ

I'm thinking it might work.  The spot that the nozzle starts each layer is going to be the main problem.  It creates like a seam that will probably need to be filed smooth.  There is an option called Jitter in the software to stagger this seam, I may try that too.  

Have you tested these yet Nate?:D:cool:

Quote from Jeff Nading on January 14th, 2012, 05:35 AM

Have you tested these yet Nate?:D:cool:

I printed them last night.  The cap fits a little too snug but I do have it together ready for a test.  I want to modify the cap and reprint it so it fits better.  Gotta pick up some parts for the air lines today. :)

Nate

Quote from firepinto on January 14th, 2012, 06:18 AM

Quote from Jeff Nading on January 14th, 2012, 05:35 AM

Have you tested these yet Nate?:D:cool:

I printed them last night.  The cap fits a little too snug but I do have it together ready for a test.  I want to modify the cap and reprint it so it fits better.  Gotta pick up some parts for the air lines today. :)

Nate

K .. the first test is done.:)  There was some tiny leakage, but not where expected.:D  I was able to put 100 PSI into it.:exclamation: There is definitely room for improvement in this department.:cool:  The video is grinding away in Movie Maker right now, and is second in line for uploading.  I'll have it up as soon as I can. :P

Nate

Quote from firepinto on January 14th, 2012, 07:25 PM

Quote from firepinto on January 14th, 2012, 06:18 AM

Quote from Jeff Nading on January 14th, 2012, 05:35 AM

Have you tested these yet Nate?:D:cool:

I printed them last night.  The cap fits a little too snug but I do have it together ready for a test.  I want to modify the cap and reprint it so it fits better.  Gotta pick up some parts for the air lines today. :)

Nate

K .. the first test is done.:)  There was some tiny leakage, but not where expected.:D  I was able to put 100 PSI into it.:exclamation: There is definitely room for improvement in this department.:cool:  The video is grinding away in Movie Maker right now, and is second in line for uploading.  I'll have it up as soon as I can. :P

Nate

Wow Nate, 100 psi is amazing :cool:, can't wait to see the video's :P.

Quote from Jeff Nading on January 14th, 2012, 07:48 PM

Quote from firepinto on January 14th, 2012, 07:25 PM

Quote from firepinto on January 14th, 2012, 06:18 AM

Quote from Jeff Nading on January 14th, 2012, 05:35 AM

Have you tested these yet Nate?:D:cool:

I printed them last night.  The cap fits a little too snug but I do have it together ready for a test.  I want to modify the cap and reprint it so it fits better.  Gotta pick up some parts for the air lines today. :)

Nate

K .. the first test is done.:)  There was some tiny leakage, but not where expected.:D  I was able to put 100 PSI into it.:exclamation: There is definitely room for improvement in this department.:cool:  The video is grinding away in Movie Maker right now, and is second in line for uploading.  I'll have it up as soon as I can. :P

Nate

Wow Nate, 100 psi is amazing :cool:, can't wait to see the video's :P.

I'm having trouble getting videos uploaded from home.  My DSL is horrible.. I'm going to have to try uploading later this week.  Anyone have any experience with Satellite internet?  I'm ready to tell CenturyLink where they can put their DSL.:dodgy:

Nate

https://www.youtube.com/watch?v=XZN8t9ZFrzg

Very cool design.  As the pressure trys to push the componants apart it compresses the o-ring tighter.  I bet NASA would like this!!!  Just not sure how to take them apart?? Maybe push together then freeze?? Then thaw the top piece? Nice work.

Very cool design.  As the pressure trys to push the componants apart it compresses the o-ring tighter.  I bet NASA would like this!!!  Just not sure how to take them apart?? Maybe push together then freeze?? Then thaw the top piece? Nice work.

Quote from Blazer on January 17th, 2012, 06:31 PM

Very cool design.  As the pressure trys to push the componants apart it compresses the o-ring tighter.  I bet NASA would like this!!!  Just not sure how to take them apart?? Maybe push together then freeze?? Then thaw the top piece? Nice work.

Thanks Blazer,
The taper design was basically just a side of effect of printing with out support material.:)  It will come apart with some twisting and pulling.  I was really surprised that it didn't come apart with high pressure.  

Nate

Quote from firepinto on January 17th, 2012, 05:29 PM

https://www.youtube.com/watch?v=XZN8t9ZFrzg

Very cool Nate.

[attachment=737][attachment=738]
Phase two O-ring pressure test.:P  I tweaked the barb cap, increased the inside diameter, fixed up the barbed end.  I also added a bottom base cap.  That will test an O-ring in a sandwich type configuration, while the cap tests in a sleeve type config.  The flanges "should" fit 4 6-32 screws and nuts.  The bottom cap uses the same 1" O-ring size as the cap.  Not yet printed!  Will be tomorrow.:D

1.21.12 EDIT
I found some errors in the model when I ran the tank and base through skeinforge.  They should be fixed now.:P  [attachment=741]

Nate

Quote from firepinto on January 20th, 2012, 08:14 PM

Phase two O-ring pressure test.:P  I tweaked the barb cap, increased the inside diameter, fixed up the barbed end.  I also added a bottom base cap.  That will test an O-ring in a sandwich type configuration, while the cap tests in a sleeve type config.  The flanges "should" fit 4 6-32 screws and nuts.  The bottom cap uses the same 1" O-ring size as the cap.  Not yet printed!  Will be tomorrow.:D

that's going to be cool!!! fun stuff Nate! ~Russ