Thinking about the TDC mod

6017 Views 17 Replies 9 Participants Last post by 1tonne, Oct 19, 2013

Milli

Discussion Starter · Jul 30, 2013

So I have a Bar-10. It has the common issue of spinning to the side at long distances due to the hop up. I've read Masterjuggler98's guide to the mod (which was very helpful, by the way) and still have some questions:
Will the mod completely take care of the hook, making it shoot perfectly straight? Or are other mods necessary, like shimming?

In other words, will my gun be shooting fine after just this one mod?

I really don't want to screw up my gun, and so am trying to make sure I do this right.

Now, off to bed. :zzz:

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raultiger

· #2 · Jul 30, 2013

It is always a good idea to shim in addition to a tdc. It may not be absolutely necessary, but it doesn't take much time and is worth the effort.

If your gun has a consistent curve to one side or the other, then this will most likely fix your problem (assuming the bucking and barrel are installed correctly and are aligned right). If, however, it is curving inconsistently to the left and right, you may need other upgrades.

A TDC is never a bad idea

Also, make sure you check out MiloXC3's video tutorial.

Reactions: 2

Masterjuggler98

· #3 · Jul 30, 2013

There is never a sure fire fix all for any problem, and this is no exception. This will at least help greatly with the curving, if not solve it.

Shimming will help to further keep the arm centered, and in one spot. You can't have too much reassurance that your hopup will be consistent. I like to use scotch tape because I can get it really precise.

If worse comes to worst, you can always just take the screw out and go back up using the lever, though I doubt you'll want to.

I've said it before, and I'll say it again. Let's try to keep questions like this in my TDC thread, just to keep it all in one place. It's just more organized and easier to find stuff if it's all in one place. And I'm glad my guide was helpful.

Reactions: 2

G

· #4 · Jul 30, 2013

I'm still running standard hop-up, etc, with upgrades, and i have no bb's traveling left or right, she's shooting dead straight. I admit, before when it was stock, i had bb curve, but the new barrel and 170 spring seem to have cured that problem. Its shooting 0.4's hard and long, i've been trimming one of my neighbours big flower trees from 35m away. I've run out there with my tape and measured it exactly. But thats all i have for a range, target practice at the moment.

I'm about to receive a DW Type-B Hop-up arm, once i have that, i'll throw the Firefly bucking in, that i'm looking forward to, so yeah why dont you try that first if you don't want to do the TDC mod? Or like others have mentioned, shim your arm, but just letting you know, i haven't even shimmed my hop-up arm, i just ever slightly flattened each prong on the arm for when i was going to do the mod to use the Firefly, but i opted out last moment, and ordered the Type-B. So as a result, each prong is slightly flatter than before and made a very good difference. Was it just the new spring and barrel that stopped the bb curving, or making the prongs flatter, i dont know. But i do get inconsistency, not often, but i know a new hop and arm will be a great mod. Range should increase a little i think. : )

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Dorekido

· #5 · Jul 30, 2013

35m is still not out of range AEG....

Milli

Discussion Starter · #6 · Jul 30, 2013

raultiger said:
If, however, it is curving inconsistently to the left and right, you may need other upgrades.

Yeah, my bar-10 is inconsistent. It mostly curves to the left, but I'll get the occasional right spin.

And Masterjuggler98, next time I'll post it in the TDC thread. Yes, your guide was very helpful. And you use scotch tape for shimming? Doesn't it flatten/thin out after awhile?

Thanks to everyone for your helpful replies!

Backspin

· #7 · Jul 30, 2013

Didn't read all of the replies, however, in response to not wanting to mess up your gun. It's already hooking so it can't get any worse. Everything can get fixed, I understand you being hesitant if this is your first serious mod but everyone starts somewhere. Give it a go, if it doesnt go well plenty of guys on here will be willing to help. Myself included. The benefits are worth it.

Reactions: 1

Masterjuggler98

· #8 · Jul 30, 2013

I put a whole bunch of layers of scotch tape to build it up. It has a sticky side so it doesn't move, and it's just thin enough that you can get the hop arm perfectly centered with virtually no wobbling.

The hop arm doesn't wear it down if that's what your asking. I put the tape on the chamber sides so the plastic arm rubs against the tape. I never got a new arm (well... I did 3d print one so I can go back to a normal bucking if I need to), I'm still using the stock plastic one with a new nub for an r-hop. Even without the r-hop, I don't really see the the reason for a metal arm unless the plastic one breaks. The plastic arm doesn't bend with the TDC.

Reactions: 1

Milli

Discussion Starter · #9 · Jul 30, 2013

I like the scotch tape idea. Originally, I was going to use a thin brass plate, as I've seen people post, and then I'd have to cut and glue it. The tape seems just as effective, if not better.

And thanks, Backspin! I appreciate all the help.

raultiger

· #10 · Jul 30, 2013

Yeah sparfucile, 35m is not nearly long enough of a range to test on. You said it was shooting straight and your probably right on your 35m range. However, you only start to notice the curving at the end of the bb's flight path (unless the hook is very bad). You would start to see it around 70 or 80 meters.

G

· #11 · Jul 30, 2013

raultiger said:
Yeah sparfucile, 35m is not nearly long enough of a range to test on. You said it was shooting straight and your probably right on your 35m range. However, you only start to notice the curving at the end of the bb's flight path (unless the hook is very bad). You would start to see it around 70 or 80 meters.

Yeah your right about that, will range test and chrono this weekend.

1tonne

· #12 · Jul 30, 2013

I used aluminium tape that is used for wielding for shimming my hopup as it does not wear out and it holds it's shape It is also very thin so you can shim it more accurately. You can get it from your local engineering firm. Ask them for about 20cm worth. They will most likely give it for free and you will have heaps left over for future little mods if need be.

Reactions: 2

fdkrew

· #13 · Oct 18, 2013

If you don't have to tools to do the regular TDC mod try the internal TDC mod which is adjusted from the bottom. Info here: http://www.airsoftsniperforum.com/32-general-sniper-talk/4634-top-dead-center-mod-tdc-guide-13.html#post85618

Cakes

· #14 · Oct 18, 2013

R-hop job, TDC mod, and a dangerwerks B arm later, my personal rifle TM-VSR-10 G-Spec was good to go.

No more 'slight' curve or shimming required.

TDC is highly endorsed by me.

Milli

Discussion Starter · #15 · Oct 18, 2013

Thanks fdkrew, I did the mod awhile ago, think I posted it somewhere. The internal design is pretty creative though. I'm kind of thinking about replacing the screw with a scope cap/adjuster, it'll look better and probably be a little less prone to getting screwed up if it hits a branch or something.

FalloutState

· #16 · Oct 18, 2013

Just a thought, in my mind the internal version is bad for your bucking.. Unless you tear your gun apart after every game, it'll deform. At least from everything I've read.

Milli

Discussion Starter · #17 · Oct 18, 2013

Yeah, I wondered that when I looked at the photos. The screw is anchored in the hop arm, so the tip must be in constant contact with the bucking...which probably means it could rip the bucking.

1tonne

· #18 · Oct 19, 2013

It will take a very long time to damage it though. It is not worth worrying about

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