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20mm shell ( revised)

Lifetime17

Lifetime17

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Joined
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Hi,
The first post put up on the 20mm was put up by the famous Ed Crouse.Genius.
He did that at the time cause i was unable to post pis, thank you Ed. Well now i got dis. so here are some of my pics of the build. Theres a .223 cal round next to it for comparison in size.This can use 18650 or 26650 cells with reducer.
Ed i borrowed your size comparison idea good thinking. :-))

Specs...
L=12 1/2 in.
Dia = 2 in. shell case
Dia= 1 1/2 in. Heat Sink
Weight= 5Lb 8oz
NDB7A75
4.0A SXD with ramp up
G2 lens
mW 5500 +

hope you folks enjoy this :-))
 

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That is unfreakinbelievably awesome! And it looks fairly simple to do overall. I do believe I will have to do something similar at some point. Thanks for the pics!

EDIT: I have a bid in for a 20mm dummy round on eBay now.....:evil:
 
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Totally awesome, that makes one hell of a chamber laser bore-sighter! Very nicely done!
 
Lifetime17 said:
Hi,
The first post put up on the 20mm was put up by the famous Ed Crouse.Genius.
He did that at the time cause i was unable to post pis, thank you Ed. Well now i got dis. so here are some of my pics of the build. Theres a .223 cal round next to it for comparison in size.This can use 18650 or 26650 cells with reducer.
Ed i borrowed your size comparison idea good thinking. :-))

Specs...
L=12 1/2 in.
Dia = 2 in. shell case
Dia= 1 1/2 in. Heat Sink
Weight= 5Lb 8oz
NDB7A75
4.0mA SXD with ramp up
G2 lens
mW 2400 +

hope you folks enjoy this :-))
Click to expand...

That is amazing. Did you build this or MrCrouse?

I'm confused about the specs, though. You say 4.0mA, but I'm guessing you mean 4,000mA or 4A? Also, 2,400mW seems very low for an NDB7A75 with a G2 lens. That is around the 1.7A level in DTR's tests. Do you mean 4,200mW? These diodes are capable of over 5 watts. Regardless, this is incredible, and I can't say I would have done much different. The primer cap being the switch adds the ultimate finishing touch to the build. I want to build one SO BAD now. Lol.
 
hi sorry wasn't thinking clearly i did edit the thread with the proper numbers. my apologies long day.Ifyou like that check out my 10x beam exspander tread here in the 445 forum.:-))
 
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Thank you 215 took a long time to get the figures right and specs it hold 2-26650 or 2-18650 cells.
 
I would like to have more info on the switch in back. I have two different dummy 20mm rounds on the way here, considering trying to build a similar laser.
 
Well it's a simple latching switch and the bottom of the host was machined to fit the switch. I don't know what the rating in Amp the switch is though.
 
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