Pollynator_bravo2 Posted September 3, 2023 Posted September 3, 2023 Evening all so My CYMA CM.057B (Dragunov SVD variant AEG) randomly is firing out two bbs with one trigger pull. It was doing it after game day one with zero modifications done. I’ve checked the bucking and this is in next to new condition. I have added a M120 spring and on .25g it’s achieving 1.6j. I’m using cyma svd mid cap mags as the hi cap that came with it broke on day one and I thought originally that may have been the issue. I’ve seen about drilling a 6mm grove into the top of the hop to help hold a bb in place but is this a legit solution ?
Cannonfodder Posted September 4, 2023 Posted September 4, 2023 What voltage battery are you using? Going too high with the voltage can cause over spin of the motor Rogerborg 1
Dan Robinson Posted September 4, 2023 Posted September 4, 2023 ^^^^^^^^ This - my one double pews with 11.1v.
Fatboy40 Posted September 4, 2023 Posted September 4, 2023 5 hours ago, Cannonfodder said: What voltage battery are you using? Going too high with the voltage can cause over spin of the motor ... and to add to the above I'm assuming that there's no optical controller of any sort in the gearbox (monitoring the sector gear) offering "cycle control" so that it doesn't over spin / there some sort of active braking.
Supporters Rogerborg Posted September 4, 2023 Supporters Posted September 4, 2023 17 hours ago, Pollynator_bravo2 said: I’ve seen about drilling a 6mm grove into the top of the hop to help hold a bb in place but is this a legit solution If it's a feeding issue rather than motor overspin, then yes, surprisingly, it did help[*] with double feeding issues on my MP5K after I'd meddled with it. We're talking a small indentation. I ran a 6mm just a few turns forwards with gentle pressure, then in reverse to deburr it. [*] Always assuming that it wasn't just another disassemble-reassemble which resulted in everything lining up properly.
Pollynator_bravo2 Posted September 5, 2023 Author Posted September 5, 2023 On 04/09/2023 at 09:40, Dan Robinson said: ^^^^^^^^ This - my one double pews with 11.1v. I did use a 11.1v son gonna try a 7.4v tonight On 04/09/2023 at 10:08, Fatboy40 said: ... and to add to the above I'm assuming that there's no optical controller of any sort in the gearbox (monitoring the sector gear) offering "cycle control" so that it doesn't over spin / there some sort of active braking. No optical controller pretty basic insides tbh 19 hours ago, Rogerborg said: If it's a feeding issue rather than motor overspin, then yes, surprisingly, it did help[*] with double feeding issues on my MP5K after I'd meddled with it. We're talking a small indentation. I ran a 6mm just a few turns forwards with gentle pressure, then in reverse to deburr it. [*] Always assuming that it wasn't just another disassemble-reassemble which resulted in everything lining up properly. Ok I’ll try the battery and when I’ve exhausted everything I know that is an option. I’ve tried the take it out try again several times however it did it before I took it appart Rogerborg, Cannonfodder and Dan Robinson 3
Dan Robinson Posted September 5, 2023 Posted September 5, 2023 May the BB overlords smile down upon your efforts. ? Pollynator_bravo2 and SSPKali 1 1
Cannonfodder Posted September 5, 2023 Posted September 5, 2023 9 hours ago, Pollynator_bravo2 said: I did use a 11.1v son gonna try a 7.4v tonight Always best to try the simplest things first Pollynator_bravo2 1
Pollynator_bravo2 Posted September 19, 2023 Author Posted September 19, 2023 On 05/09/2023 at 20:35, Cannonfodder said: Always best to try the simplest things first Yeah that’s got the issue more under control. I need to get the power down now to 1.44j as I’m a bit hot at 1.62
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