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Post by Doctor on Oct 28, 2012 20:56:27 GMT -5
So I received a Umarex UMP today and I would like to create a high-speed setup for it. I planned on making it almost an free setup with; Swiss cheesing the piston and getting a really light spring and then cutting it down a bit. Are there any other things I could do without buying new parts? And I planned on keeping the 9.6 that came with the gun, no lipo.
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Post by njn551 on Oct 28, 2012 22:01:18 GMT -5
Only ways to make it for faster for free (well...almost free):
Shim, lube, Swiss cheese piston, shortstroke a couple piston teeth, and solder deans (clones work great and are cheap) connectors.
That's all I can think of right now.
Don't buy a weaker spring unless you really have to.
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Post by Doctor on Oct 28, 2012 22:03:26 GMT -5
I keep hearing about short stroking but how do I do it?
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Post by njn551 on Oct 28, 2012 22:04:07 GMT -5
Well, do you have a dremel or file?
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Post by Doctor on Oct 28, 2012 23:14:33 GMT -5
No.
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Post by Ike on Oct 29, 2012 3:12:11 GMT -5
What is your gun currently shooting at, and what do you consider "high speed"? 40rps? 50rps?
You said that the gun is a Umarex UMP, so I'm going to assume that they're rebranding the G&G. Based on my past experience with G&G motors, I'd say that with some basic fine tuning to the gearbox (shim, lube, deans), that you could reach about 20-22rps (I'm being generous) on a 9.6v battery.
And no offense, but it sounds like you're inexperienced with working on guns, and lacking some of the basic tools you'll need. Not to mention that you can only get so far without spending money. Don't expect to reach "high speed" if you aren't willing to spend money. If you do decide to go that route, here's a very brief and general guide concerning what you'll want to buy:
Start with the battery. Get a better one (preferably an 11.1v) and a MOSFET. If that doesn't get the gun shooting as fast as you'd like, get a high torque neo magnet motor. At this point, if you don't REALLY know what you're doing, stop. But, if you still aren't satisfied, get some high-speed gears. That should be enough to put you at around 40rps. But higher RPS comes with it's own problems, pre-engagement being the biggest one. . As your rate of fire goes up, your piston needs to return faster in order to be in position for the next time the gears come around.
You don't need to bother with swiss cheesing and short stroking until you improve your battery and motor at the least. Even then, you probably won't need either until you install high-speed gears, unless you're using a very light/cut down spring. The whole point of those two modifications is to prevent pre-engagement, not to boost rate of fire. Making it lighter and pulling it back a shorter distance both help the piston return quicker. A higher rated spring also pushes it back quicker, which is why a high torque motor is usually a better choice. By this point, you'll also hopefully have taken care of a lot of many other basic reliability mods, such as AOE and the like. Do your research and take your time while upgrading.
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Post by Phantom G3 on Oct 29, 2012 8:42:36 GMT -5
I agree with Ike completely. I tried a high-speed set up and didn't like it because it was too fast for me. When I did this (back when I was younger), I had the enhanced JG geabox and put AIM Tornado High-Speed Gears in it (came with a steel teeth AIM piston). All I had was the regular JG blue motor and a 9.6V battery without Deans. It shot VERY fast like that (of course I shimmed and lubed it properly). Once I put a 11.1V LiPo in the gun, it shot and felt like a minigun. When you do this, please have a MOSFET. I was too stupid when I was younger and didn't do it. Even though my rig held up fine, I would never suggest to do such a high-speed set up without it.
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Post by Doctor on Oct 29, 2012 9:20:47 GMT -5
Alright all very good advise, I'll start with the shimming, lube and deans. And I just looked at the battery and its a 10.8, like I said I just got it yesterday and haven't had a lot of time to look at it. I have gearbox experience being that I have opened up and rebuilt gearboxes before I've just never upgraded before. Thank you all and I'll take all this advise into mind.
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Post by Phantom G3 on Oct 29, 2012 9:41:00 GMT -5
You're welcome! And if you ask what brands are better for upgrading, I will assure you that there will be a debate amongst everyone on it...  |
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