Quote:
Originally Posted by Grevn
its a specna arms b10, in the gearbox i have a new swiss arms cylinder, swiss arms cylinder head, swiss arms piston head, element full metal rack piston and the rest is stock. The gears seems fine, just the piston and cylinder that got destroyed.
i chronoed it to 100m/s with .28g bbs with a m120 spring.
what i think maybe have happend is that when the piston head came lose it increased the friction in the cylinder that maybe caused the sector gear to chew upp the piston and push around the piston, scraping the cylinder, maybe? :P
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M120 spring on stock gears will cause full gear cycling which indicates to me that your piston may not be designed for that amount of stress. The angle of engagement is more critical since you have a full metal teeth rack on the piston. Metal on metal will typically cause a catastrophic failure compared to plastic on metal contact.
By the way the standard chrono is .20g bb's for most North American fps limit measurements. 100m/s is about 350fps, but with an m120 spring expect about 400 fps on .20g bb's. Try to re-do the chrono on .20g bb's if possible.
Usually loctiting the piston head isn't an issue, but it doesn't hurt to do it anyway.
You should try to use the bevel-pinion method to shim for the best performance.
If you could, please post some pictures so that we can see exactly where the failure occurred and we could possibly give some input on how to prevent it.