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Waste oil bypass spray nossle. 1st Attempt...

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NeoTech:
uhm i dont wanna rewrite and repost so i just post the link to my blog, please waste the click and comment here.
http://www.roughedge.se/blogg/2013/03/09/first-attempt-spray-nozzle/

Issues:
 1) Spray pattern is onesided not uniformed.
 2) It blows out o-rings like a motherf***er
 

Questions:
 1) should the needle feed part be smaller its 6mm od, with a 3mm hole that runs upto a 1mm exit. if it smaller the bypass channels could be.. well better.
 2) I think i made this in the wrong order, doing the bypass channels as one of the last steps. It created some issues with internal sealing.

Please comment.. =)

philf:

--- Quote from: NeoTech on March 09, 2013, 12:27:19 PM ---Issues:

 2) It blows out o-rings like a motherf***er
 

--- End quote ---

NeoTech,

Without seeing the cross section it's difficult to be certain but I'd say your O-ring grooves are nowhere near deep enough. Typically the difference between the shaft and hole diameters for static applications should be 0.12mm for a 1.6mm section O-ring & 0.15 for a 3mm section.

See: http://www.roymech.co.uk/Useful_Tables/Seals/O_Rings.html

Phil.

pete3000:
Had you considered a bab style feed? which is basically a compressed air feed blown through a fine hole or pair of holes drilled into a sphere. the waste oil can then be drip fed from the top meaning you wont get blockages :D

linky http://www.mig-welding.co.uk/forum/showthread.php?t=23193

NeoTech:
yeah i have looked at the bab styled nozzles.. i can say that i really dont like that construction.. its easy to make but a accident waiting to happen.. but its prob. just my limited knowledge about them speaking..

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