1. Post #1
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    holding this information back for now. has a few issues that i need to work out.
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  2. Post #2
    iFail's Avatar
    March 2009
    2,449 Posts
    airsoftmechanics forum has some pretty good info for accuracy by grouping.

  3. Post #3
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    airsoftmechanics forum has some pretty good info for accuracy by grouping.
    yeah I know i've been lurking there for awhile. I'm not done writing yet.

    airsoftmechanics is also very anti noob friendly.
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  4. Post #4
    No such thing as overkill.
    catbarf's Avatar
    January 2007
    7,995 Posts
    Awesome guide! What would you recommend using to grind down teeth on the piston?

  5. Post #5
    iFail's Avatar
    March 2009
    2,449 Posts
    yeah. that hunterseeker guy has the fucking biggest personality cult.

  6. Post #6
    TheDon's Avatar
    January 2012
    592 Posts
    Danke!

  7. Post #7
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    Awesome guide! What would you recommend using to grind down teeth on the piston?
    dremel/xacto/file.

  8. Post #8
    iFail's Avatar
    March 2009
    2,449 Posts
    what kind of tools would you recommend for gearbox work?

  9. Post #9
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    What kind of work are you planning to do?
    A surgical tool kit has all kinds of nifty things in it like forceps, tweezers, scalpels, scissors.
    A set of flathead, philips, and torx, screwdrivers.
    A set of files.
    Needle nose pliers.
    A micrometer
    A dremel.
    Zip ties

    For electrical work:
    A soldering iron with a set of various tips.
    Wire strippers, like the kind that are a big pair of sissors with a bunch of holes in them, not the ones you adjust yourself, those are garbage and dont work.
    Electrical tape
    Heat shrink tubing
    Multimeter
    Piles of connectors
    Various spools of wire.
    Helping hands holders.
    A small vice.

    Edited:

    oh yeah any questions you post i'll work into the guide.

    writing up the second half or third depending on how much I decide to cover.

    Edited:

    Really all you actually need are the screwdrivers to get inside and nimble fingers. I wear polyurethane gloves to keep all the nasties away from my precious fingers

  10. Post #10
    YEAH, AND?
    felix the cat's Avatar
    December 2010
    9,532 Posts
    I haves a question. Do I need a mosfet to run lipos without burning out my trigger? Or will I be okay without one if I'm just running a 7.4v?

  11. Post #11
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    Oh. That reads a bit confusing.

    You only need a FET when you have a high current. 7.4v lipo is pretty low voltage so as long as you dont have some crazy motor pulling retarded amps it should be good.

  12. Post #12
    GOSH FUDGING DARNIT
    Fish Muffin's Avatar
    January 2008
    7,524 Posts
    some crazy motor pulling retarded amps
    lol

    Edited:

    he does

  13. Post #13
    YEAH, AND?
    felix the cat's Avatar
    December 2010
    9,532 Posts
    some crazy motor pulling retarded amps
    Uh..well shit...I guess one of my guns will fine without a FET...

  14. Post #14
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    Take a look at the trigger contacts and see if there is any charring or blacking on them.

    Edited:

    Oh god i've just realized I've hijacked the questions thread
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  15. Post #15
    YEAH, AND?
    felix the cat's Avatar
    December 2010
    9,532 Posts
    Take a look at the trigger contacts and see if there is any charring or blacking on them.
    They're all fine right now, but I haven't bought any lipos yet. I was planning on getting some since all my NiMh batteries suck dick in the winter.

    Edited:

    Which sucks because the only reason I'm keeping my AEGs is because I can't use my gas guns in the winter either

  16. Post #16
    Gold Member
    Foosili's Avatar
    January 2005
    7,707 Posts
    I love you jat.

    I love you.

    But this needs pictures hard.
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  17. Post #17
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    They're all fine right now, but I haven't bought any lipos yet. I was planning on getting some since all my NiMh batteries suck dick in the winter.

    Edited:

    Which sucks because the only reason I'm keeping my AEGs is because I can't use my gas guns in the winter either
    Well the discharge (C) rating on a battery is how fast it can discharge SAFELY. Not it's maximum discharge rate.

    Your motor will pull whatever it damn well please out of the battery until the battery overheats and vents/explodes/fire/porkchop sandwiches.

    So if you're not getting any nasty arcing on the trigger contacts with the motor under load, you should be fine, but I'd really look into getting a FET even if you dont need it.
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  18. Post #18
    YEAH, AND?
    felix the cat's Avatar
    December 2010
    9,532 Posts
    Well the discharge (C) rating on a battery is how fast it can discharge SAFELY. Not it's maximum discharge rate.

    Your motor will pull whatever it damn well please out of the battery until the battery overheats and vents/explodes/fire/porkchop sandwiches.

    So if you're not getting any nasty arcing on the trigger contacts with the motor under load, you should be fine, but I'd really look into getting a FET even if you dont need it.
    So do I want an active breaking mosfet? Or what?

  19. Post #19
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    Well a mosfet basically acts as a gate. When you pull the trigger it tells the mosfet to open up and let the current through instead of having the motor current run though the trigger contacts.

    It just so happens you can pack in extra features such as active breaking and voltage cutoff while you're at it.

  20. Post #20
    YEAH, AND?
    felix the cat's Avatar
    December 2010
    9,532 Posts
    Well a mosfet basically acts as a gate. When you pull the trigger it tells the mosfet to open up and let the current through instead of having the motor current run though the trigger contacts.

    It just so happens you can pack in extra features such as active breaking and voltage cutoff while you're at it.
    So this one will suffice?
    http://extreme-fire.com/2011-SW-S.html

  21. Post #21
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    brb sleep i'll post the other half tomorrow and fix any errors in the first half.

    Edited:

    Mosfets dont actually really work bellow 8v.

    So it depends on what you pick for batteries.

  22. Post #22
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    also if you get a good active breaking FET you can remove your anti-reversal latch.
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  23. Post #23
    Gold Member
    FloaterTWO's Avatar
    November 2008
    7,180 Posts
    If i wanted to build a gearbox with a retardedly high ROF, what kind of things would have an effect on speed/rate of fire/strength so it doesn't explode after a few thousand rounds?

  24. Post #24
    I HATE COFFEE
    jomt1234's Avatar
    April 2009
    8,383 Posts
    Sticky this thread?
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  25. Post #25
    YEAH, AND?
    felix the cat's Avatar
    December 2010
    9,532 Posts
    If i wanted to build a gearbox with a retardedly high ROF, what kind of things would have an effect on speed/rate of fire/strength so it doesn't explode after a few thousand rounds?
    Hi torque motor, hi speed gears, good low resistance wiring, good battery, nice polycarb piston, and personally, I'd go with a silent piston head/cylinder head set to help reduce the stress impact. But whatever cylinder head/piston head combo you like best will work

  26. Post #26
    No such thing as overkill.
    catbarf's Avatar
    January 2007
    7,995 Posts
    Hi torque motor, hi speed gears, good low resistance wiring, good battery, nice polycarb piston, and personally, I'd go with a silent piston head/cylinder head set to help reduce the stress impact. But whatever cylinder head/piston head combo you like best will work
    Wouldn't you want a high speed motor, not high torque?

  27. Post #27
    Gold Member
    FloaterTWO's Avatar
    November 2008
    7,180 Posts
    Reducing the likelihood it's going to explode and i'll have to repair it is what i'd prefer. I know it's lazy not to perform occasional maintenence on guns but i have a feeling it's going to be unavoidable if i'm putting a ton of rounds through my gun.

    Reccomending parts so i can start building a shopping list would be good.

  28. Post #28
    YEAH, AND?
    felix the cat's Avatar
    December 2010
    9,532 Posts
    Wouldn't you want a high speed motor, not high torque?
    No, because hi speed motor plus hi speed gears = gun no go shooty because it can't pull any spring

  29. Post #29
    iFail's Avatar
    March 2009
    2,449 Posts
    depends on spring strength

    Edited:

    right?

  30. Post #30
    child porn prodigy
    venom's Avatar
    April 2005
    15,333 Posts
    postal postal postal

    pls sticky thx

  31. Post #31
    POOP DICKS
    Dark Descent's Avatar
    August 2008
    4,912 Posts
    Jat I just wanted to say thanks for the advice, I got my ak working again<3

  32. Post #32
    YEAH, AND?
    felix the cat's Avatar
    December 2010
    9,532 Posts
    depends on spring strength

    Edited:

    right?
    No, hi speed motor + hi speed gears won't even pull an M90. You need alot of torque to turn the hi speed gears. Either that, or you run a hi speed motor with normal or torque gears which is not as efficient.

  33. Post #33
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    you want a high torque motor with a gear ratio depending on your needs.

    I'll re write that section as there's so many questions about it.

    Edited:

    postal postal postal

    pls sticky thx
    and no I want a better name for it when it's done. This is a draft that I want input on.

  34. Post #34
    Gold Member
    Foosili's Avatar
    January 2005
    7,707 Posts
    Yeah, this needs pictures you know
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  35. Post #35
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    IM WORKING ON IT DAMN IT.

    I'll add pictures when its completely written up. Typing up the bit about hopup right now.

  36. Post #36
    Gold Member
    Foosili's Avatar
    January 2005
    7,707 Posts
    Woohoo

  37. Post #37
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    Oh yeah, im going to wait to take my own pics when I have my new parts and dont have a cracked gearbox.

    That would look rather embarrassing.

    Edited:

    updated with a few more paragraphs.

    Also the paragraph about cylinder polishing disappeared ;__;

    Edited:

    damn you facepunch not letting me bump!

  38. Post #38
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    Changed the bit about the Mosfet around a little, also added a tools section at the top.

    Also going to add a changelog at the bottom instead of just posting like this.

  39. Post #39
    Bestest polish IFAPer
    BBOOBBYY!'s Avatar
    February 2007
    5,099 Posts
    ZOMBIE GHOAST PAGE , LEAV THIS PLACE

    Anyway, this gotta be one of the most useful threads on fpair... WILL USE

  40. Post #40
    Jat Goodwin's Avatar
    August 2008
    931 Posts
    I cant figure out how to get facepunch to format it into sub categories I guess I'll pull the ROF bit away from accuracy to avoid confusion.