Supporters Sitting Duck Posted January 24, 2017 Supporters Share Posted January 24, 2017 Sometimes - it can be because another factor.... I say SOMETIMES because it all depends on the switch installed. Some old style switches have 2 prongs at the rear which MUST have a copper plate on selector plate AND MUST make good consistent contact when firing..... It is a crap old design than can cause issues when firing - often in semi than auto I'm not saying this is the exact case in your instance but another thing to check see the copper plate may not be making good contact in semi and some resistance ? In auto the plate slides further back and makes better contact with these 2 prongs... So you "can" get intermittent firing issues if these prongs are not bridged by the selector plate NB - I'm not saying for certain this is the case but it is a fairly common issue at times Most modern switches do not have these rear prongs - eg: shs switches G&P & G&G plus others But others like Cyma SRC - these two I know have the prongs at the rear - ooh APS as well I think If the prongs are not bridged soundly you will have issues... NOW there is a way you can bridge these contacts with say a staple/wire and solder them BUT you should ONLY do this if you run a mosfet mosfet's run very low juice at the switch so it is fine DO NOT JUST BODGE IT IF YOU ARE NOT USING A MOSFET !!! pic says a 1,000 words... Link to comment Share on other sites More sharing options...
Gazzalesta Posted January 24, 2017 Author Share Posted January 24, 2017 I've put a shs selector plate and shs switches on it. Il pull it apart again and have another look see if I can see what is happening Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted January 24, 2017 Supporters Share Posted January 24, 2017 Ahh right then if it has the SHS switch assembly, not just a SHS trolley then you won't have those prongs. Now another thing is risk of piston/spring bottoming out or get close to it. If you shortstroked then this won't be the case But it is hard to pinpoint as to why a lockup might be happening without seeing, hearing it or checking the amp current draw etc... Link to comment Share on other sites More sharing options...
Gazzalesta Posted January 24, 2017 Author Share Posted January 24, 2017 Yes I've short stroked it. I'm lost to know what's going on. It be any kind of gear locking up Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted January 24, 2017 Supporters Share Posted January 24, 2017 Weird it is locking up on semi but ok on auto ??? especially on stronger motor - stock motor & poor battery yes if precocked it might not shift easily The semi issue led me to think the copper plate/prongs not touching but that is not the case if it is shortstroked then piston can be bottoming out at back of box then - nope piston binding - some pistons are very tight fitting in some boxes that they bind normally this slows the rof down and with a strong motor it should still fire coz it has the grunt if you have shortstroked 2 teeth then the piston will just pass the window at rear of box if you shortstroke 3 teeth the piston just reaches the far rear end of window it could be catching at the window - file these rear guides of pistons at angle to reduce any chance of catching BUT tbh I doubt if if this is the real issue if she is firing ok on auto.... I'm leaning towards a tight binding piston either too tight piston or rails the piston inserted in box should fall freely if tilt box up/down google some vids coz the copy/paste feature is not working - but you will need to check for binding slightly file the rear of the runners on piston right at back to assist or reduce the risk of catching on window Really tbh - you need to maybe check the amps if possible - I'd say you are well over 20amps if the motor is straining a bit to cycle on auto & locking on semi it is either a bad bad connection on motor or wiring (not the prongs but along those lines) or you got some mechanical lockup to extra stess which kinda overcomes on auto but not on semi from start possible chipped tooth on gears or a bit of plastic can lock up stuff - but I don't know your shimming MUST have some tiny play side to side when box is finally assembled bevel must be shimmed as close to possible the perfect height... too low and pinion will try to jam or push the bevel right through the box as tries to mesh - straining and ramping the amps too high and the tip of pinion will nearly hit the bevel's AR lugs the AR latch uses (not a common thing but some boxes have a bit more shimming space in say bearings than bushings and you can shim too high) It is something daft, that is for sure but I'm seeing nothing and the new host isn't too clever for posting links/pics/vids either atm so I suggest to strip it ( AGAIN ) and really really check just how silky smooth them gears turn how smooth that piston glides back & forth in the runners - how the piston falls or slops about Deffo worth checking piston out - loads of agro I know but welcome to the world of toy guns How hard can it be ??? I reckon it isn't until you reach the thried build you start to get a better idea around about 6th build you are sort of getting there by overcoming previous issues and I reckon about 9th or 10th build you finally build a box that you are really proud of that lasts and we are ALL STILL LEARNING - think we never stopping saying WHAT THE F*CK on these poxy toy guns hope some of crap helps Link to comment Share on other sites More sharing options...
Gazzalesta Posted January 25, 2017 Author Share Posted January 25, 2017 Mate you have helped me so much already thanks. il pull it apart tomorrow had no time today. And check everything you said and post results on here Link to comment Share on other sites More sharing options...
Gazzalesta Posted January 25, 2017 Author Share Posted January 25, 2017 Yes it fire fast and strong on full auto but soon as I fire on semi it fires once then locks up fully even if I put it bk on fully auto Link to comment Share on other sites More sharing options...
Gazzalesta Posted January 27, 2017 Author Share Posted January 27, 2017 This is doing my head in now checked everything nothing catching or rubbing gears moving smoothly re shimmed with new ones still no change Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted January 27, 2017 Supporters Share Posted January 27, 2017 Check your amps & new battery higher burst.... what spring you using - should only need a m110-115 if Shortstroked a couple of teeth weak motor connections, bad joins etc..... try another motor just in case did you correct AoE properly ? if not it could be getting bolloxed on the next cycle or pick up but then wouldn't it screw up on auto wiring - mosfet - contacts at switch if it all operates smoothly mechanically then it must be some sort of electrical issue worse case scenario it is a number or mixture of issues I would try a higher brust lipo 25c 7.4v - NOT 11.1V if using 12:1 gears ffs it will smash up using a high burst 11.1v on speed gears ensure all connectors are sound tamiya/deans deans is best but reckon some electrical problem perhaps really need to check amps well over 20amp you may have undue stress in the box maybe ? check motor spins outside the box/grip - had one with an iffy armature - rare but can happen if a winding blows try another motor chrono the sod on auto - you may have a m150 spring in there but you would notice it tbh when closing up box it is something bloody weird or a few things or a bad part of some description but I can't tell coz I haven't got it front of me & not even got a pic of your box/work to look at try a few things above if not open the thing up & take some pics - upload to imgur of stuff don't worry if it isn't a perfectly neat job - I've done worse bodge or bad teching in the past (not that great now tbh but have f*cked up loads in my quest to get it better) somebody - one of us can look at it and likely shed some more light/suggestions on the bastid box Link to comment Share on other sites More sharing options...
Gazzalesta Posted January 28, 2017 Author Share Posted January 28, 2017 I have no way to check amps and only standard motor I tryed my 7.4 wouldn't work with it only with 11.1. 120 spring or that's what I was told Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted January 28, 2017 Supporters Share Posted January 28, 2017 I have no way to check amps and only standard motor I tryed my 7.4 wouldn't work with it only with 11.1. 120 spring or that's what I was told Ahhhh that might be part of the problem..... With higher speed gears you are placing more strain from start position 12:1 or 13:1 is like you trying to pulling much higher spring than a m100 then add in a higher spring on top & the poor stock motor is trying to start pulling say a m150 but due ratio's it doesn't have an easy start like trying to do a steeper hill start in fully loaded clapped out fiat panda or something even if you rev the thing the lame engine is going to struggle no matter I suggest you look towards a shs torque & try her on 7.4v 25c lipo the motor upgrade is going to be required imho some stock motors are ok but most are not for an upgraded mechbox try looking out for a shs torque - not speed motor - long type most likely check ak2m4 and others for shs or RA torque or at a push zci balanced reckon that should sort it out sorry thought you had an upgraded neodym magnet already but obviously I got confused with similar post do not get a speed motor - you want a good balanced motor like a shs torque run on 7.4v - not 11.1v as that may be too much and could wreck the box if you go too quick depending on what you get rps then 11.1v will be 50% again... problem is at 25rps you start getting a bit close to PE or PME you should be ok to say 27 - 30 rps but finally rps can vary if you push it too much the sector engages the piston and makes a nice mess inside trust me - if there is one thing I have done often it is taking the pi$$ and smashing f*ck out of a half decent box Link to comment Share on other sites More sharing options...
Gazzalesta Posted January 28, 2017 Author Share Posted January 28, 2017 The problem I got it's all money and this time of year I have next to nothing so gonna have to shelf it till got spare cash Link to comment Share on other sites More sharing options...
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