Found perfect tube to use for Mod but have some questions

[Blakd]

Ok as the title states I have found perfect tube to use for mod but I have some questions on sizes.

First the tube is an aluminum barrel from a paintball marker, it is painted but I will be able to remove the paint. The inner bore is .68 and I have checked to see if an 18650 2400Mah protected batt would fit in it. This is a no go as the batt needs to have a .69 or.70 bore to fit the batt.

Are 2000 and 3000 Mah batts thinner than the 2400Mah? I have seen that sometimes the 3000Mah will fit a tube but a 24/2600Mah won't. Is this because the diameter or the length?

What is the best way to bore the hole out for the whole 18" tube length? I have looked in to an adjustable reamer set but it cost more than buying a lava tube. Is there any place maybe around north west dallas that could bore this out for cheap?

I would really love to get this bored out and then I can cut it down to size clean it up and also anodize it myself. The walls on this tube are pretty big so boring it out wont be a problem. Any answers/help would be greatly appreciated.

Thank you.

 

[Deadite]

18650 batteries have a diameter of between 18 and almost 19mm. You might need to go with 14500 battery, they have a 14mm diameter.

Or you could drill out the barrel to 0.75 inches (19mm) that would give you enough room.

 

[VpnDrgn]

First question would be what batt are you using? I have noticed my AW batts are thinner
than the trustfire and lifepo batts I have used in the past.

I would imagine any machine shop would charge a pretty penny for a one off job like that.

I would suggest cutting down to the length that you need and then using a conical rasp
and a drill bit extension to ream out the inside enough for your batts to fit.

I have a GLV mod that takes 16340 batts ( stacked ), and I tried to ream it out enough
to fit an 18650 batt. The walls were too thin, but I managed to make enough room for a
17670 to fit.

That would be my last suggestion, try using a 17670 batt, it should fit with no modding.

 

[Blakd]

The battery I was checking it against is an UltraFire 18650 3.7V 2400mAh that came in an ego battery tube.

VpnDrgn. I think you are my new best friend. I was looking into the adjustable reamers but did not even think or remember a rasp would work.

 

[Blakd]

Ok on to the next step. What chip or resistor would I need to keep a constant 3.7 voltage all the time is any?

 

[VpnDrgn]

The only one I remember for sure is the 4050C booster.
You could do fixed resistance for whatever voltage you want.
Don't forget to account for the voltage drop of whichever
atty/carto you use.

I vaguely remember there being a 3.7V regulator similar to the 5V
regulator that Madvapes carries.


Since I'm your new best friend, you're gonna make one of these for me right?

 

[Mylt1]

18650's are between 18 and 19mm as posted above, what can make the difference between it fitting and not is the plastic "cover" that the battery is wrapped in. you could remove the plastic cover but i wouldnt. find a better tube is my best advice.

 

[Blakd]

Thank you both. VPN looks like I can get around 6 out of the tube. So I will reserve one for you.

After looking around it looks like what I am maybe wanting/needing will be

http://www.madvapes.com/LDO-5-volt-30-amp-regulator-with-control-pin_p_2123.html?lt_c=1&quickcart=1

http://www.madvapes.com/Tactile-Switch-with-Round-actuator-100g_p_2500.html

Some battery contacts, and springs

http://www.madvapes.com/Prewired-510-Battery-Connector-Sealed-_p_2769.html

And a power indicator to hook up 5 of these http://www.madvapes.com/3mm-Violet-LED_p_2112.html up to.

This should give me the constant voltage instead of the drop off I experience with the batts I have. Also the switch might just be flush with the outside wall of the tube. And then the leds can be put at different positions to monitor battery level.

does this sound about right?

 

[nicotime]

@Blakd....you can also ream out tube with an adjustable brake cylinder hone....for example....
OEM/1/2 to 2 1/4 in. adjustable brake cylinder hone (25032) | Brake and Engine Cylinder Hone | AutoZone.com

Just be sure to keep a flow of cold water over it or submerge it in a bucket of water while doing it so the aluminum doesnt gum up the stones....and watch the drill/press doesnt get wet.

 

[Blakd]

Nico,

Omg. Thank you. I could not for the life of me remember what it was I was looking for and you sent me right to it.

 

[VpnDrgn]

Blakd, that's a 5v regulator. It requires 2 batts in series ( stacked ), that would be
a very long mod for 18650's, unless you went with 18350's maybe.

Does it regulate to 3.7v with one batt, or maybe you can lower it with a resistor? ( I don't know )

 

[Blakd]

ty then i will have to keep looking. they have one that regulates down to 3.3 but i want to stay at 3.7 from 3.7.

 

[VpnDrgn]

I did a quick search and the only ones I could find were all rated for very low amps.
I think your only option is going to be the 4050c booster. You don't have to make
it VV, you can set the desired voltage with a resistor and it will fit in an 18650
tube mod. You can get free samples from TI.

 

[Blakd]

Ok Thank You

 

[Blakd]

Just ordered samples of the PTN04050C They should get here really soon. I used http://www.e-cigarette-forum.com/forum/battery-mods/247184-list-mod-coverters-newbs.html for a little help. Thank you guys for all the help now I am playing the waiting and ordering game before I attempt this.

 

[Blakd]

Ok so Ti wont send me any samples, kept looking and found one that should work on an electronics forum. IC BOOST 3.8V 0.1A TSOT2335 - NCP1400ASN38T1

Here is a link to the person who discovered this.
SparkFun Electronics • View topic - Complete Novice: Regulating 3.7v Lithium Ion Batteries

 

[VpnDrgn]

Sorry, it is only rated 100ma, that is nowhere near enough.

 

[Blakd]

Man. Eventually I will find one

 

[SeanO'Connell]

They do sell .69 and I think .70 bore barrels. Thanks for the idea. I'll do some searching on cheaper ones and post some links if I find anything suitable

 

[Blakd]

Ok new question on this. Has anyone found a threaded bottom cap like what is on the provari and on there site for sale? End Cap for ProVari