Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

Batterycap thread type of Dragon Lasers Spartan?

Joined
Mar 6, 2011
Messages
279
Points
28
Hello, does anybody know the thread type of Dragon Lasers Spartans battery cap?I want to add a tube and mod it to work with 18650 batteries.
 





BowtieGuy

0
LPF Site Supporter
Joined
Oct 14, 2012
Messages
6,090
Points
113
Hi MrM, I just checked my 589nm Spartan, and the outside diameter of the male end of the battery tube measures at 22.6mm, (probably 22.75mm nominal size).

The thread pitch looks to be 0.75mm.

The inside diameter of the tailcap (female thread), measures 22.0mm. This is consistant with it being a 0.75mm pitch thread.

Edit: If you're having someone make this for you, it may be a good idea to send the tailcap to ensure the best fit. These chinese parts seem to vary from part to part. :D

1bcab21e-bb1d-4c38-a667-139cb57d1c10_zpsqd9ukdr3.jpg
 
Last edited:
Joined
Mar 6, 2011
Messages
279
Points
28
Thanks for those exact measurements. I thought maybe someone know the standard of those threadings. This might be good to know. There are some many different standards.
 

BowtieGuy

0
LPF Site Supporter
Joined
Oct 14, 2012
Messages
6,090
Points
113
You're welcome. It gave me a chance to play with my 589nm for a while.

Yes, the 0.75mm pitch is a standard metric thread pitch, also, like you said there are many standards depending on what you're trying to accomplish.

Edit: I just checked my CNI PGL host, and it has a coarser 1.00mm pitch thread, which would be a little harder to crossthread.
 
Last edited:

Pman

0
Joined
Nov 28, 2012
Messages
4,447
Points
113
I don't know if something has changed but the original 447nm Spartan calls for 3.2V cells and not 3.7V. Better check it out first before you take the next step;)
 

ru124t

0
Joined
Jan 17, 2014
Messages
555
Points
28
Definitely do not use 3.7V battery without major mod. I know this for a fact because I smoked a 447 doing this! See my signature!!!! I do however have a perfect host for a mod if someone is interested in making a Frankenspar laser.
 
Joined
Mar 21, 2016
Messages
966
Points
43
Definitely do not use 3.7V battery without major mod. I know this for a fact because I smoked a 447 doing this! See my signature!!!! I do however have a perfect host for a mod if someone is interested in making a Frankenspar laser.

Could you post a pic?
 




Top