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Big stroke 55 cc one cylinder ICE

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Roger B:
3 D printed herringbone gears is an interesting concept  :)  :)  :ThumbsUp:

This is a gear I photographed many years ago in a Hamburg docks scrapyard.

crueby:
Interesting photo Roger - I never had a close look at a herringbone gear, it does make sense now that the center would not have the teeth meet up, never realized that would be the case.

Roger B:
Apparently my picture is of a double helical gear, a herringbone gear's teeth do meet in the middle. Both have interesting manufacturing problems   :headscratch:

AlexS:
Agree just a test print of the gear. Indeed it is rather a double helical gear, no theeth meet in middle section.

Already produced a second one with printing with supports and higher extruder temperature. Without fixing tool, both gears match quit well. Would print the test fix tool later.

Piston

Simulated in Autodesk Nastran. Result quit Okay, only need to add a stiffening around small end boss to bottom side of oil scraper ring (inside of piston) There was a safety factor of 2.5 as lowest of whole piston by 53 bar combustion pressure.

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