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قديم 05-29-2013, 05:37 AM
 
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افتراضي Evanix Max (0.22)Review & Mods

This is an old post I made some time back when I got my Evanix Max, it was an O.K rifle meaning it did well in many areas & it had that “WOW” factor but it needed a lot of work to get it shooting & performing better, unfortunately I gave that rifle to friend which I couldn’t say no to & I don’t have it any more to do the last changes I had in mind specifically with the electronics , so I won’t be able to help in any more tests, tunes & hacks
.


Also Evanix Send me a new complete gear box that fixed the multi shot issue & also the problem with the bolt where it gets stuck half way where you can’t remove the magazine by using a braking system where the pellet probe hits when it retract by cutting power off.
Another problem arises from the new box, any higher voltage battery will get you back to the same problem since the new braking system isn’t fact enough to cut power & the probe has already reached half way by the time the power if off.
That is something I did before they sent me the replacement part using a 555 Timer where you can adjust the power for each trigger pull in micro seconds and therefore any voltage isn’t a problem anymore.
I also made my own PCB board & replaced the trigger with a direct switch, check below.

Part 1: (The Good the Bad & the Ugly).

Alright than, so I had this debate with someone about the best plenum size for the regulator & based on what I read from Bob's its roughly 1cc/fpe, he said it should be 1/2cc for every Fpe & also the barrel length aka volume should be taken into consideration.

So I decided to do some testing with regulators on the Evanix Max which is a full auto rifle, I was also worried that the regulator would not be “fast” enough to supply air while shooting in full auto & maybe I need to take that into consideration too for the chamber size & provide enough air for 2-4 shots, since the Magazine only allows 11 shots & that's all you can fire at one time. But that's another story & it seems the regulator is working fine at full auto with only 12cc chamber.

Here is a picture of the rifle disassembled & you can see on the left 3 regulators & 4 different chamber sizes.


Here is how the regulator fits inside the tank: I had to machine a custom fitting with double O-Ring that fits snugly inside to hold & seal regulated Air as seen in the picture below.


That's what I have my regulator set at the moment: 128 Bar (The below picture is another custom made regulator checker), if anyone is interested these regulators are made by a great friend of mine who many know him as Altros, since this post was made, he had made many new improvements, so you can always check his website here (http://www.altaros.cz)




Just a couple of things about the below graph, I decided to use a tank volume size of 280cc for regulated graph since that is close to what the regulator eats from the tank & maybe to get a more accurate figure for efficiency using Lloyd's calculator. So please feel free to correct me if I am missing anything.

Obviously I need to try the 1cc/fpe energy rule & try a 30cc chamber, but I also think that I might need to set my regulator at a higher setting to close the valve faster & not waste too much air. But is there a formula to find out the regulator settings for a particular fpe etc.?


as you can see that efficiency is better with less plenum volume in this case 6cc which is 0.88 vs. 0.82 but maybe that's cause it’s also shooting slower 840's compared to about 880's for the 12cc. Unfortunately I can’t play much with hammer weight, travel & spring preload for the time being since this rifle is motorized but I shall do that on a later stage.

I have seen from the Russian forums that someone did weight the hammer & found it to be around 70 grams.

Part 2(Issues with Air Valve & trigger Flex):
I will be shooting the 18.1 JSB at around 890-910, so that's about 32 ft/lb. & going with that rule is about 32cc, I will have to machine another chamber to get that 32cc, and will report back here. I have seen Edgun using about 80% plenum size but again that all depends on many different factors.

The Max is not bad but it does have its issues, the trigger link flexes bad, the gauge is hidden deep inside the stock & covered by the trigger link, the shroud doesn't do a good job at making the rifle quiet & last but not least, sometime on semi auto it fires two burst of shots.


I'm actually a bit confused on why no one ever tried adding a regulator, since it was shooting way too bad without one, you can see the E.S of 170+. Now it's dead on at 50 yards.

Some people complained about the Max not holding air once it’s emptied, I had the same issue but I realized it was because of the valve stem being stuck & not sealing & that’s because the hammer is way too heavy and that valve stem is actually a little soft so with time it expands as can be seen in the picture below.


I have already made a longer cylinder that is 42cm & 60cm long compared to the 40cm original, I might try the 42cm since 60cm is way too big & I like to keep is short. That big cylinder was made from 4140 & was fit on the Evanix AR6 (Pictured Below), but they share the same size, dimensions & thread.


Once I'm done with these than I will have to make improvements to the electronics, I have some experience with that.
Here is a picture to show how hard that hammer is hitting.


Part 3 (The Hammer weight Mod):

A quick update, the hammer on the Evanix is too heavy 71g & with the strong spring it’s actually making quite a damage, now my valve stem is stuck again & I need to remove it & fix it so it seals.

I also removed some material from the hammer to make it lighter.

The original hammer weight.


The modified hammer: I wanted to make it 40 grams, but it will do for now.



The valve stem stuck open as can be seen where the stem is held inside and also the damage the heavy hammer is making on the base fitting:


Lipo batteries do have many advantages & I have been using them in all RC products I modify
etc.,, but when it comes to airgun, I actually need a slower rate of fire, the reason being that even in semi auto, there are many times where I hit the trigger once yet I get a burst of 2-3 shots, the other reason is that Lipo need not be drained beyond 3.2v/cell otherwise they die or puff up, also you need a special balancing charger & last & most important is that the danger of them exploding.
I know it’s a rare case if you know what you’re doing, but I can’t be bothered with the headache associated with them for an Air rifle.

Now regarding the issue with multi shot fire in semi auto is electronic/gearbox but these are improvements that did help. I had to add a stronger spring for the trigger, that way once you fire in semi auto, it’s much more difficult for the rifle recoil movement to trigger another shot, the issue


I also made some changes to the hammer, first I reduced the weight to 44grams this time & also made a small groove for the torsion spring so there is less travel, plus a little bend to even lessen the travel. By my calculation it seems the torque by the spring is around 360-450 N based on the online calculator, I am just not sure about the wire type used & hence the 360-460 if anyone is interested.
http://www.planetspring.com/pages/extension-spring-calculator-extension-spring-calculation.php

Here is a quick comparison pictures.

Before

After

I am still doing loads of test about regulator plenum size & it seems that 1cc/ft/lb. is actually the most efficient way to go, but with 33cc you use a much lower regulation & therefore I decided to increase the spring preload behind the valve. Now I am getting about 35 shots at 33ft/lb.

Part 4 (Electronics & gear system) and Magazine Mod Video:
If you ever used the new magazine than you know it's a pain to load, cause you need a pen or something to push "each" pellet. This mod works on all calibers.

Here is a video with a small & simple mod to make loading much easier & hence much faster.

http://i1206.photobucket.com/albums/bb444/naser404/AC1D6E12-9C21-4180-A297-C69E44214DD8-5037-000014CC676CEA14.mp4

Even after making the hammer a lot lighter in weight & reducing the spring travel, it is still making damage opening that valve & again it got stuck, so this time I will make my own valve & I went over board and ordered a titanium Grade 2 bar to make the valve stem.


Also because of the chipping metal from the hammering on valve stem, these tiny metal particles have been drawn inside the motor by the magnets & the brushed flat motor smokes when I shot in full auto.
Now I opened the motor & I'm cleaning it.


The motor is a brushed FLATDC F480 if someone wants to google the data sheet for more info.



This yellow tiny button is the switch which has a very short.


After many shots, I can tell you that the battery only latest for about 250 shots give or take about 50.

It's beyond me why Evanix didn't makes these small fixes here & there & before releasing it.

Part 5(The 555 Timer & electronic trigger):
I decided to make my own 555 timer with some help from a friend who knows a lot more about electronics than I do, yeah I’m a bit rusty, lol



(Google 555 timer to see what it does)

I also removed the trigger link completely & their power switch & replaced it with one that is much smoother & connects directly to the trigger. Just had to mill the trigger guard to fit that.



Once you push that button (aka trigger) the timer send a short burst or power which is tunable using the two post on the PCB board to spin that gearing system for a fraction of a second.


Part 6 (keeping it quiet):

The shroud system is nice but it just wasn’t up to my expectations & I had to machine my own extension using a bigger tube made from Aluminum 6061T6 with an O.D (Outer Diameter) of 25mm if I remember correctly & based on this old sketch I made before I machined it, The baffles inside are 3D printed on my home made printer & works great.



And finally after some painting, no anodizing, needed a quick fix J


Finally some comments:

If you need a bullpup than your better off with an Edgun or a Cricket, if you want a semi auto than FX is much better not without its issues but never the less better compared to this and better yet is the Daystate MCT.
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هيثم موسي (05-29-2013)
قديم 05-29-2013, 06:23 AM   رقم المشاركة : [2]
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افتراضي رد: Evanix Max (0.22)Review & Mods

thanks alot for your effort
its a gerat article
thsnks again mr Naser


we wil waiting more articles

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قديم 05-29-2013, 09:01 AM   رقم المشاركة : [3]
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افتراضي رد: Evanix Max (0.22)Review & Mods

Thank you Haitham,

I forgot to mention about the accuracy of this rifle & its actually very good, about 20mm CTC ( center to center) for 5 shots groups using JSB heavy 18.1 grains
Maybe a little better if i do my part.

JSB Pellets are by far "the" best pellets in the world and all my rifles shoots best with them.

Also if anyone is interested in translating this post to Arabic than please do so.
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قديم 05-29-2013, 12:02 PM   رقم المشاركة : [4]
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افتراضي رد: Evanix Max (0.22)Review & Mods

thank u uuuuuuu
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[SIGPIC][/SIGPIC]

من مواضيعي في هذا القسم SAMER


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قديم 05-29-2013, 12:18 PM   رقم المشاركة : [5]
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افتراضي رد: Evanix Max (0.22)Review & Mods

nice gun
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من مواضيعي في هذا القسم شادي ابوالدهب


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قديم 05-29-2013, 12:31 PM   رقم المشاركة : [6]
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smsmn8888 شخصية مميزة بالرابطةsmsmn8888 شخصية مميزة بالرابطةsmsmn8888 شخصية مميزة بالرابطةsmsmn8888 شخصية مميزة بالرابطةsmsmn8888 شخصية مميزة بالرابطةsmsmn8888 شخصية مميزة بالرابطة
 
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افتراضي رد: Evanix Max (0.22)Review & Mods

this what we need NoW
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يارب اشفي ابني يوسف يارب
ربنا موجود

من مواضيعي في هذا القسم smsmn8888


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قديم 05-29-2013, 01:44 PM   رقم المشاركة : [7]
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افتراضي رد: Evanix Max (0.22)Review & Mods

I read this a while back on TAG and I remember seeing it on the yellow as well, but you have added some details I think or I may have not followed the topic on TAG close enough.
Thanks for sharing and I like how you try improve a gun that most people here in Egypt won't even dare take it apart even for cleaning.
I am a huge fan of modding.

If it's not broken, modify it.
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من مواضيعي في هذا القسم Griffin


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قديم 05-29-2013, 04:16 PM   رقم المشاركة : [8]
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افتراضي رد: Evanix Max (0.22)Review & Mods

Naser you have to share the designs for your 3D printer. I mean man it's a moral obligation you simply have to do it.

I'm resisting trying to use you to buy some 2024 tubes, so please be kind enough to share the designs with us.

And I have always heard of the 1 cc/ fep rule but didn't realize it was referring to efficiency, it always puzzled me if the rule meant that the maximum power output is 1 fpe /cc them how would changing the pressure change the power. Thanks for setting things straight for me.

Wanted to ask where is the spring vent on that Altaros regulator? and did you make that regulator test rig yourself ? can you please tell us some details about the regulator test rig?
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قديم 05-30-2013, 06:56 PM   رقم المشاركة : [9]
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افتراضي رد: Evanix Max (0.22)Review & Mods

Hi Griffin,

My 3D Printer is home made based on open source design with some improvements tweaks etc, i bought the parts myself < .
extruder, stepper motors Nema17, Arduino board & drivers & made it, best if you Google Reprap

you will need to do some reading but its not that difficult, i am also working on my own design with dual extruders and larger printing area but that will take some time as i have others things i'm busy with these days.

For the 2024 material i don't buy it from the local market, they don't sell it, i just order from the U.S based on my .
requirements.

http://www.onlinemetals.com

to calculate tube burst use this calculator http://www.engineersedge.com/pipe_bust_calc.htm

but use the yield not Ultimate strength & use 2 as safety factor, you will still have to hydro incase of factory quality control etc.

Also these regulators by Altros don't need atmospheric 1mm hole & they do work good.

Last that 1cc/fpe is a general rule for efficiency purpose but i realized that a little less is actually better but varies depending on many factors.

take care.
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قديم 05-30-2013, 07:02 PM   رقم المشاركة : [10]
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افتراضي رد: Evanix Max (0.22)Review & Mods

Interesting to read and take advantage of a lot of information. Do not deprive us of your mighty topics
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