[Advice] Tomtac gearbox parts (mainly gears)

[SCAR_Jester]

Hi all,

brother and I are about to put together a little project gun for kicks.

I've got all my parts sorted and ready to go but I wanted to know all your opinion..

A long while back I got a tech to do some work for me and I asked for 13:1 gears to be put in, he ended up putting in Tomtac gears of which I had never heard of before.

After a short amount of research they look awfully like ZCI gears, and @Sitting Duck mentioned a while ago in a thread that he had a barrel from ZCI with Tomtac slapped on the side, this leads me to think that ZCI is to Tomtac what Rocket airsoft is to SHS.

Would this be correct?

If not, are they some good parts I could use from Tomtac?

Thanks in advance!

 

[Sitting Duck]

HelmetWorld - snigger

Yup pretty sure that is correct

TomTac barrels are ZCI

TomTac gears are quite likely to be ZCI/Core Oem 13:1's

nice gears but watch for bevel, if it has 8 AR latch lugs might have really thin 10 teeth on it

16:1 sets I've seen have lately seemed to be 6 AR latch lugs and a bit thicker 10 teeth

Last 13:1 set I used I dropped the bevel and used an old SRC that had 5 latches

(could also use a 5 latch G&G)

"might" get a bit of "roll-back" using a 13:1 set with 4 AR latch lugs on it

crappy techy stuff....

gear seats - the bevel turns 1/3 of the ratio (honest)

a 18:1 set the bevel turns 6 or 6.25 times each full cycle

so with 4 lugs you got 24-25 lugs for AR Latch to catch each complete cycle

a 13:1 set will have 4.5 turns of bevel per complete cycle

so you need 6 latches = 26 lugs per cycle

or at a push 5 latches = 22.5 lugs per cycle

on a 4 latch bevel you only get 18 lugs per cycle

Now you might be fine, I mean lets face it with a DSG you get 2 shots per cycle

So on a 6 latch with a 16:1 (5.75 turns of bevel) = 34.5 lugs

but then 2 shots means each shot is a half cycle with 17.25 lugs

Nahhh f*ck it, 4 latches is fine for 16:1 and 13:1 at a push if you have to

Just make sure the bevel you eventually use meshes well with pinion etc....

If in doubt, if you think the bevel 8 tooth looks weak then don't chance it

Check the AR Latch works effectively - often it doesn't hurt to file the AR latch

(like they recommend on DSG builds....)

Ah crap, should be fine on a 6 lug AR Latch if all up to scratch

On a 4 lug AR Latch you might wanna check and slightly file/reduce the AR latch length a smidge

That way is "should" latch ASAP than risk skipping on first attempt if ARL is a tad too long

Ahhh sod it - pic says 1,000 words what Siegetek suggest checking.....

Double check the spur & sector for any minor cracks (only had one sector so far a bit iffy on 16:1)

Apart from all that you should be fine

Both barrel & gears will be ok as ZCI's or gears as ZCI/CORE oem

(in fact they look similar to Lonex gears - just they have Lonex stamped on the sector)

Some people even try to pass the ZCI/Core gears off as 2nd gen SHS as they were a bit similar

(Or the Super Shooter gears SHS offer)

If the gears are sound they are a very close second to SHS,

maybe even run smoother in some boxes - as long as your chosen bevel is decent

 

[SCAR_Jester]

@Sitting Duck

Thanks for the info, yeah I shaved down my ARL on my current setup actually as I noticed it helped. 

I can't off the top of my head remember how many teeth it had but there is no roll back, unlike the old 2 tooth (Yes 2 Teeth!) G&P bevel which rolled back almost every shot.