AUTO XX
0
- Joined
- Aug 13, 2010
- Messages
- 839
- Points
- 28
Hey guys, this is my 3rd 445 build and because I don't have a mind of my own I am following the trend of making a "1.5A 445 build"
I wanted a better heatsink for long runtimes though because this one will be used continuously for several minutes at a time at least.
Spun a few thou off of the module (before pressing in the diode) so the focus ring would sit tight against the heatsink and protect the lens threads in case of "bumps"
I still need to press the module in a little farther but I was planning on pressing the module in until the focus ring sat tight focused to infinity. The problem with that is the laser is at its least average divergence and if someone come across it and turns it on not knowing what it is, there is always the potential for eye damage.
I always defocus my lasers after I use them and usually pull the batteries but I would like this one to sit tight at infinity.
The positive contact is just a circuit board with all of the components removed, the heatsink is machined so this is a pressfit as well.
This is the most measurements that I have ever put into one heatsink and it was more of a layout challenge to see if my drawings could be implemented with no deviations.
The heatsink including focus ring is 2.5" total and it has been bored to accept a 25mm X 16mm diameter pressfit driver heatsink.
I also took my time on the outside of the heatsink and made it fit +/- .01mm to most parts of the host. This maximizes heat transfer but at this point it is a little overkill.
The tight tolerances have made it a little slower to assemble (especially on the hosts imperfectly threaded bits) but again, this was just to make it as close to my drawings as possible.
The flexdrive is set to 1.497V across the resistor(s) of a dummy load and I used thermal adhesive to anchor it to the top of the driver heatsink. The wire is from flaminpyro and I can't thank him enough, this build would not have been possible without it.
Assembled, this laser has only been pressure tested to 5 minutes on but the heatsink only got a few degrees above ambient. You can feel the warmth a bit but the host warms as fast as the sink so it takes a while.
I didn't use a single drop of thermal grease anywhere on this build because I don't like the mess but the pressfit module, driver heatsink, and circuit board were a pain in the butt to get perfect.
It took about 8 hours to machine everything just right and about 15 minutes to wire the electronic components.
*It is a little anticlimactic*
I could make this build (host/heatsink/module/circuit board/aixiz lens+focus ring) for others but like I said, it took about 8 hours the first time so it would be a little spendy even doing duplicates.
At 1.5A this laser easily lights a pre-lit candle (girlfriend's scented candle) in about 8 seconds and a new, unburnt candle in about 20.
Lights white matches as soon as the girlfriend stops laughing and you find the beam with the match head.
Popped a black balloon at 47 feet but it took about 15 seconds because I was moving a bit.
Pisses off the girlfriends' fish when you pass the beam through the far side of the aquarium (Aggressive betta) . ^_^
Just used it for about 10 minutes and I could only feel the bit of extra heat with my upper lip. The narrowest part of the cone had enough heat to notice (5*C above ambient temp?) but it is so quickly dispersed that it shouldn't be a problem.
This is a "WF-501b" Ultrafire host
Hope you enjoy
-Auto
I wanted a better heatsink for long runtimes though because this one will be used continuously for several minutes at a time at least.
Spun a few thou off of the module (before pressing in the diode) so the focus ring would sit tight against the heatsink and protect the lens threads in case of "bumps"
I still need to press the module in a little farther but I was planning on pressing the module in until the focus ring sat tight focused to infinity. The problem with that is the laser is at its least average divergence and if someone come across it and turns it on not knowing what it is, there is always the potential for eye damage.
I always defocus my lasers after I use them and usually pull the batteries but I would like this one to sit tight at infinity.
The positive contact is just a circuit board with all of the components removed, the heatsink is machined so this is a pressfit as well.
This is the most measurements that I have ever put into one heatsink and it was more of a layout challenge to see if my drawings could be implemented with no deviations.
The heatsink including focus ring is 2.5" total and it has been bored to accept a 25mm X 16mm diameter pressfit driver heatsink.
I also took my time on the outside of the heatsink and made it fit +/- .01mm to most parts of the host. This maximizes heat transfer but at this point it is a little overkill.
The tight tolerances have made it a little slower to assemble (especially on the hosts imperfectly threaded bits) but again, this was just to make it as close to my drawings as possible.
The flexdrive is set to 1.497V across the resistor(s) of a dummy load and I used thermal adhesive to anchor it to the top of the driver heatsink. The wire is from flaminpyro and I can't thank him enough, this build would not have been possible without it.
Assembled, this laser has only been pressure tested to 5 minutes on but the heatsink only got a few degrees above ambient. You can feel the warmth a bit but the host warms as fast as the sink so it takes a while.
I didn't use a single drop of thermal grease anywhere on this build because I don't like the mess but the pressfit module, driver heatsink, and circuit board were a pain in the butt to get perfect.
It took about 8 hours to machine everything just right and about 15 minutes to wire the electronic components.
*It is a little anticlimactic*
I could make this build (host/heatsink/module/circuit board/aixiz lens+focus ring) for others but like I said, it took about 8 hours the first time so it would be a little spendy even doing duplicates.
At 1.5A this laser easily lights a pre-lit candle (girlfriend's scented candle) in about 8 seconds and a new, unburnt candle in about 20.
Lights white matches as soon as the girlfriend stops laughing and you find the beam with the match head.
Popped a black balloon at 47 feet but it took about 15 seconds because I was moving a bit.
Pisses off the girlfriends' fish when you pass the beam through the far side of the aquarium (Aggressive betta) . ^_^
Just used it for about 10 minutes and I could only feel the bit of extra heat with my upper lip. The narrowest part of the cone had enough heat to notice (5*C above ambient temp?) but it is so quickly dispersed that it shouldn't be a problem.
This is a "WF-501b" Ultrafire host
Hope you enjoy
-Auto
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