minisam92 Posted March 19, 2017 Report Share Posted March 19, 2017 Basically my m4 gear box has poo'd it's self and split in to 6 pieces I've always just chucked a standard one back in and carried on how ever would like to have a go at building a bit of a custom one. So far I've got King arms gear box shell , can any one tell me what size bearings I need ? Not sure on gears (can any one recommend some) Shs hi torque motor M105 spring Shs alloy cylinder/nozzle / piston Any other worth while mods ? Was going to get a mofset fitted (due to wanting to run lipos)but not really clued up on them Any advice appericated Link to post Share on other sites
Wingmann Posted March 20, 2017 Report Share Posted March 20, 2017 If you purchase a new shell it'll say the size of the bearings. SHS 16:1 gears will do nicely. You can go 13:1 with the SHS high torque for trigger response and higher RoF, and it'll work nicely on 7.4v batts. SHS 14 metal teeth piston, alu if possible or POM. Lightened. Ventilated cylinder matching your inner barrel's length. Cylinder head with double o-rings. Nozzle with o-ring. I'd also install a mosfet unit with active brake. Jefftron has some nice quality/price units with cabling included. Link to post Share on other sites
minisam92 Posted March 20, 2017 Author Report Share Posted March 20, 2017 Thanks bud , Casings 2nd hand unfortunately Link to post Share on other sites
Wingmann Posted March 20, 2017 Report Share Posted March 20, 2017 Thanks bud , Casings 2nd hand unfortunately Then take a ruler to the holes KA should be 7 or 8mm. Link to post Share on other sites
minisam92 Posted March 21, 2017 Author Report Share Posted March 21, 2017 Thanks bud was hoping that wasn't the case haha I better find a small ruler Link to post Share on other sites
Lone_Bullet Posted March 22, 2017 Report Share Posted March 22, 2017 Some sort of measuring device is a good thing to have when you're building a gearbox, in case you need to check tolerances . Good luck! Sent from my C6603 using Tapatalk Link to post Share on other sites
minisam92 Posted March 22, 2017 Author Report Share Posted March 22, 2017 A mate who's a bit more experienced is going to build it , where would I be best buying the Shs 13.1 gears from ? Also if I buy a mofset with the wiring kit do I need to buy trigger contacts ? Link to post Share on other sites
Wingmann Posted March 22, 2017 Report Share Posted March 22, 2017 A mate who's a bit more experienced is going to build it , where would I be best buying the Shs 13.1 gears from ? Also if I buy a mofset with the wiring kit do I need to buy trigger contacts ? If you are willing to purchase outside the UK, Gunfire, Safara, Taiwangun and other dealers use to have them. About the MOSFET, no, you don't need a new trigger. Link to post Share on other sites
mimesis Posted March 22, 2017 Report Share Posted March 22, 2017 Or consider something like this. Many uses, besides measuring the holes that bearings fit into. Link to post Share on other sites
minisam92 Posted March 26, 2017 Author Report Share Posted March 26, 2017 If you are willing to purchase outside the UK, Gunfire, Safara, Taiwangun and other dealers use to have them. About the MOSFET, no, you don't need a new trigger. Cheers mate will have a lookI've got a micrometer if that's what there called some where haha Link to post Share on other sites
Lord Fuckem Posted March 29, 2017 Report Share Posted March 29, 2017 I've got a micrometer if that's what there called some where haha Digital Caliper Gauge There are 2 types knocking about on fleabay Plastic/Carbon Fiber for a few quid - measures in 0.1mm Metal one about £6+ measures in finer 0.01mm - much more accurate for shimming etc.... One thing to watch out for on certain boxes that are reinforced - they often have a ridge on one half of the casing This is fine for std 18:1 or slightly faster 16:1 gears But - when using higher speed gears this ridge impedes the box closing, catching on the spur's sector teeth A little bit of mild dremel work sorts this out - just a mild bit of grinding or you can go really nutz if no dremel (I'd go for a mild careful method if possible....) https://youtu.be/AE29OdDaRHg https://youtu.be/6ZMLjBSNFu4 yeah I'd go the mild careful way than take a sledgehammer to crack a walnut but if don't have a dremel for intricate work then the large grinder will work I guess Or just use 16:1 gears if there is a ridge at the back and you can't be bothered to mod the box Some boxes you can chuck in high speed gears but reckon 40% v2's have this ridge or reinforced arc on them Check your box, decide on the work involved & then purchase the gears Link to post Share on other sites
minisam92 Posted March 30, 2017 Author Report Share Posted March 30, 2017 Thanks for the advice bud Link to post Share on other sites
malcolmg Posted April 1, 2017 Report Share Posted April 1, 2017 But a set of Mitutoyos if you can, just their basic model is all you need. They're a few bucks more, but you'll still have them when you're 65, and they'll still be quality. http://www.mitutoyo.co.uk/small-tool-instruments-and-data-management/calipers/530-104 They have some super mac daddy versions if you're flush with cash, but I've done plenty of precision work with those basic ones. Link to post Share on other sites
minisam92 Posted April 4, 2017 Author Report Share Posted April 4, 2017 Already got a set in my tool box bud but thanks for the link Link to post Share on other sites
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