MtnDon's Entry, 2017 (5th Annual) BLF Old Lumens Contest, Handmade Category

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CRX
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Nice, thanks. I thought it was a lot bigger but that’s quite cute Smile

MtnDon
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MRsDNF wrote:
How did you do the radius’s on the corners? They look so neat.

The edges were radiused with a router bit. IIRC Facepalm it was a 1/4” (about 6 mm) radius. Looks to be too big for the smallest bit I have which is 1/8”. The router spins that at 27500 RPM’s. A sharp carbide bit provides a very smooth finish .
EDIT: I compared it to the completed bookshelf unit in the shop… yes, this light block is 1/4”.

MRsDNF
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Thanks for the update. I’d have radiused my hand if I used a Router. Facepalm

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

Enderman
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Next time make the LED a levitating ball using induction Smile

lostheplot
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nice end result.looks great

sorry all images down
thanks photobucket

MtnDon
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Someone was wondering if there was sufficient heat sinking. I wondered too. So a while back I ran a full throttle test. Full throttle being 700 mA. I should have posted before.

The ambient temperature was 70 F, 2 C
After three minutes the copper plate the led mcpcb is mounted to was at 76 F, 24.5 C
At 13 minutes the copper was at 78 F, 25.5 C
After 30 minutes the copper was at 82.5 F, 28 C and the wood block measured directly above the led was at 88 F, 31.2 C
A full hour after the start the copper was at 83.2 F, 28.5 C with the wood warmed to 89.4 F, 31.9 C

I run the light mostly at 50% and it barely seems warm.

When charging a half depleted cell, the charger copper plate heat sink runs about 7 degrees F higher than the base temperature of the wood, finger tip warm.

MRsDNF
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So there is no chance of turbo accidentally happening? The wood catching fire that is. Smile
Amazing light Don. Its a whole different skill set working with wood. My left thumb can vouch for that. Smile

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

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