The Shop > Tools
Anybody build Dan Gelbart angled laser centre finder?
Arbalist:
--- Quote from: PekkaNF on April 18, 2015, 11:13:29 AM ---This laser slurps 20mA @3V, LR44 is a bit marginal, DG says "CR2 lithium 3V camera battery" and it last about 40 hrs on his model. I got 2*AA battery holder, but I'm thinkking of cramming 2*LR1. They look like AAA, but 2/3 of the length.
Pekka
--- End quote ---
Ah, ok. Thanks for that. I saw the CR2 in the supermarket yesterday and thought they looked a good size if I needed more capacity.
RodW:
Interesting thread, I just received 2x 5 mw focusable lasers for this project. I had half an hour spare so the first one went into a torch body that has 3xAAA batteries in it.
I stripped the LEDs off the circuit board and made up a Flanged adapter to replace the torch lens turned up out of a bit of Delrin. Before I got this far, I had a play with some resistors and 3.3 V and 5 V power supplies. If you end up with one of these and it is too bright, a resistor will dim it down quite easilly. The unit weighs 13.4 grams so I will choose a battery that is similar in weight. Either CR2 or CR123. I had a quick play with a ND photographic filter. You can get plastic Cokin compatible photogrpphotographic filters off eBay for a few dollars. I may cut a filter out of what I have If it is too bright.
appletree:
Hi does anybody have a link to Dan Gelbarts centre finder design details that works please.
PekkaNF:
--- Quote from: appletree on April 19, 2015, 04:47:19 AM ---Hi does anybody have a link to Dan Gelbarts centre finder design details that works please.
--- End quote ---
Hi,
My opening post, second link and a little down the page:
Found the link: https://drive.google.com/?tab=wo&aut...nU3V0E
Just above it is Dan's pointers, well worth of reading it. He recommends one type of laser module and I bought mine from that link. This laser seems to have a real regulator and it can't be dimmed same way than LEDs (decreasing the voltage).
Most people have taken the easy way and mount the laser on arbor. There seems to be few slip on designs.
Thanks for the polarizing sheet link, I never would have found it with those search words. What kind of material it is to hanadle? Post would be here way over the initial price.
Pekka
appletree:
Thanks for the Link I will have a look in a minute, The polarising film is just that looks very much like a standard phone screen protector, it came in an envelope on its own not even between 2 bits of cardboard but is no worse for it.
Have yet to try it but will do when I get a minute, to be truthful i'm not very keen on the eye risks with lasers and I am awaiting the arrival of some blue glasses, I assume the offer a degree of protection and enhancement
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