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February 2nd, 2009, 22:56
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#1 |
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Piston grinding
This is my CYMA Aks74u mechbox, v3
Hey guys, take a look at this...  This is the gear i am using...  1-2-3 is pointed out to let you know i am using all 3 bushings rather than 2 with the modify gear set. I filed the holes a little to let each bushing fit nice and snuggle. All 6 of them are in the hole with a bushing. the spring is only a 100%-110%... What could be the problem? Is it because i played with this setup in the winter? rather than not modifying the bushing holes, i could have used only 4 (which the instructions explained for clone mechboxes).. is that the problem? maybe by using 6 bushings instead of 4, it shifted the gear set a little and is causing this problem?
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Armory: -Primary: Upgraded CYMA AKs74u -Side Arm: KJW Sig Sauer P226 |
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February 2nd, 2009, 22:59
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#2 |
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How much shooting have you done, and how high is your rate of fire. Piston bodies are generally considered the "consumable" part of the mechbox. High rate of fire tends to consume it a lot faster.
Edit: Just saw your gearset is a high speed set. You need a stronger piston in order to take the high speed setup. This would work fine.. http://www.airsoftparts.ca/store2/in...oducts_id=1173
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February 2nd, 2009, 23:00
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#3 |
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ROF isnt fast at all, last time i checked it was between 10-15. lets say i put approx 2000BBs through this setup
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Armory: -Primary: Upgraded CYMA AKs74u -Side Arm: KJW Sig Sauer P226 |
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February 2nd, 2009, 23:01
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#4 |
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Only that speed? A high speed gear set with a weaker spring should give you a pretty high rof.
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February 2nd, 2009, 23:05
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#5 |
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Official ASC Bladesmith
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You don't have a 100% or 110% spring (really don't exist in the % labelling unless made by PDI, and those are too low ranges to be PDI, I've never heard of them), you have a m/s spring, which is too strong for high speed gears to deal with properly, and the piston teeth are suffering from it. Another thing that kills piston teeth is a 9.6V large battery, ususally the assend of the piston gets ripped off, but shredded teeth happens too.
Largely decide what you want, high speed gears or lower fps, like inthe area of under 300fps, and move from there. But keeping the combination you have with the 370-400fps spring and the high speed gears............. prepare for many piston replacements. |
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February 2nd, 2009, 23:16
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#6 |
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sorry yes m/s...
for the record, i am using 8.4V, and my FPS is 320 What i understood from you stalker is that: high speed gears + low spring = not recommended? when, high speed gears + high spring = recommended?
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Armory: -Primary: Upgraded CYMA AKs74u -Side Arm: KJW Sig Sauer P226 |
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February 2nd, 2009, 23:30
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#7 |
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You have a good spring for high speed. High speed works best with lower velocities. Not sure why you're experiencing such a low rof though. With a soft spring and high speed gears, that gun should be a BB hose.
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February 2nd, 2009, 23:32
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#8 |
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what do you think about the modification on the bushing holes?
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Armory: -Primary: Upgraded CYMA AKs74u -Side Arm: KJW Sig Sauer P226 |
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February 2nd, 2009, 23:38
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#9 |
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That's something one would have to see to inspect properly to determine fitment. And when it comes to gears, shimming, bushings, etc, I'm certainly no expert on the matter. I just know from experience that high speed setups can be hard on pistons, particularly if you have a high energy spring.
It seems that something is slowing down your gearbox though. Maybe the gears are too tight and don't spin freely. I know they're the Modify modular set, but who knows with a CYMA gearbox shell. They're not known for good tolerances. Perhaps the sector gear is "digging in" to you piston too much, causing the extra resistance and the wear, again due to poor tolerances of the shell. Hard to say, really..
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February 2nd, 2009, 23:44
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If that was the way the spring was installed and its wrong.
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February 2nd, 2009, 23:45
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#11 |
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i will take that to mind crunch, i will use only 4 bushings instead of 6
ill try that out
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Armory: -Primary: Upgraded CYMA AKs74u -Side Arm: KJW Sig Sauer P226 |
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February 2nd, 2009, 23:50
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#12 | |
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It's possible that the extra bushings and all are squeezing the gears and preventing them from spinning as fast as they could. To test fit and action of the gears, install the gears, but not the spring, piston, and cylinder. Close up the mechbox and reassemble it with all screws properly tightened and see how easy the gears are to turn. They should turn freely with next to no resistance. If they don't turn freely, they're too tight. I had this issue with a set of Modify modular gears, but for me it was an incorrectly seated bushing that was causing the extra pressure and it was causing my gearbox to lock up.
Quote:
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February 3rd, 2009, 00:00
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#13 | |
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Quote:
Last edited by zone 69; February 3rd, 2009 at 00:02.. |
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February 3rd, 2009, 00:07
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#14 | |
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Quote:
crush... omfg.... there were pieces of the piston between the gears.. im spinning the damn thing without it being in the mechbox and it stops at the same point... the color of the piston meshed very well with the gears so it was hard to find.. anyway, i took 2 pieces out.. now it spins freely now to test it inside mechbox with modular set only... ok it spins freely... 2 full turns by pushing it with my pinky from where the cylinder would be.
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Armory: -Primary: Upgraded CYMA AKs74u -Side Arm: KJW Sig Sauer P226 Last edited by byblos; February 3rd, 2009 at 00:10.. |
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February 3rd, 2009, 00:09
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#15 | |
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Quote:
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Armory: -Primary: Upgraded CYMA AKs74u -Side Arm: KJW Sig Sauer P226 |
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