Breaking News
Comments
Newest First | Oldest First | Threaded View
Page 1 / 2   >   >>
Clive
User Rank
Author
Re: Fresnel lens maybe...?
Clive"Max"Maxfield   7/9/2014 9:53:25 AM
NO RATINGS
@slomobile: Whichever way you go, you might consider using a 1 1/16" Forstner or anular bit (ideally spun by a cnc mill for accurate grid placement)on the face of the hardboard to positively locate each brass washer.

That's not a bad idea -- I was already moving to using a CNC machine to drill the holes, because having them wander aroudn even a little will ruin the whole look of the thing.

slomobile
User Rank
Author
Re: Fresnel lens maybe...?
slomobile   7/8/2014 6:43:43 PM
NO RATINGS
Whichever way you go, you might consider using a 1 1/16" Forstner or anular bit (ideally spun by a cnc mill for accurate grid placement)on the face of the hardboard to positively locate each brass washer.  You can fine tune the depth to just barely capture the film/lens between washer and board eliminating the need for glue there.  A small bit of glue in the recess can unobtrusively secure the washer if needed.  The hole depth can also be used to adjust distance from LED to film/dissuser/lens.

Max The Magnificent
User Rank
Author
Re: Fresnel lens maybe...?
Max The Magnificent   7/3/2014 4:37:41 PM
NO RATINGS
@jb0070: The "filler disk" could asily be glue, or wood putty / paste...

Thanks for the suggestion -- in fact I now know exactly which way I'm going to do this ... keep watching EE Times for my next blog on this topic...

jb0070
User Rank
Author
Re: Fresnel lens maybe...?
jb0070   7/3/2014 4:30:28 PM
NO RATINGS
The "filler disk" could asily be glue, or wood putty / paste (or something similar --- does not nned to be a washer / metal / "finished product"). Both harden and can be glued easily, and allow for clean up" before assembly. This can also be done to "mount" whatever lens you fit into the hole.

Max The Magnificent
User Rank
Author
Re: Make the Film Disk bigger
Max The Magnificent   5/8/2014 9:47:57 AM
NO RATINGS
@AnSc.de: Make the film disk as big as possible to fit under the washer...

This is a variation on one of the approaches I was considering -- but I think it's a better idea than mine ... let me look into this...

 

AnSc.de
User Rank
Author
Make the Film Disk bigger
AnSc.de   5/8/2014 1:22:29 AM
NO RATINGS
Make the film disk as big as possible to fit under the washer.

Then you can glue it to the inside of the outer ring, so the unwanted glue on the inner ring is avoided.

Then you can use the space of the film disk below the washer to glue the washer in place without unwanted glue outside the washer. Or use here a ring of double sided adhesive film.

You still have to be careful with the amount of glue...

 

crude Inkscape sketch:

Washer with Disk and Glue

 

Max The Magnificent
User Rank
Author
Re: Fresnel lens maybe...?
Max The Magnificent   5/6/2014 10:21:57 AM
NO RATINGS
@jstabler: I suggest you make a filler disk with a center hole the same size as your brass washer...

This sounds like a good plan ... I'll add it into the mix ... I'm still looking at a variety of alternatives ... I'll be posting a follow-up blog when I make my final decision... watch this space :-)

jstabler
User Rank
Author
Re: Fresnel lens maybe...?
jstabler   5/5/2014 7:27:02 PM
NO RATINGS
I suggest you make a filler disk with a center hole the same size as your brass washer.  It doesn't matter what material you use, could be another very cheap washer.  Glue your translucent disk to the filler disk.  Glue your new assembly to the brass washer.  Glue the final assembly to the surface of your project.  If you select your glue positions carefully, the glue should be hidden when you are done.

Max The Magnificent
User Rank
Author
Re: Fresnel lens maybe...?
Max The Magnificent   5/5/2014 2:29:58 PM
NO RATINGS
@perl_geek: Two thoughts for the mass-production...

I'm currently exploring a variety of options. I must admit that the Fresnel lenses do look rather tasty -- but it depends on (a) how they fit in the washers and (b) if I can find a really low-cost source.

I have one on order at the moment so we can check point (a) -- depending on the result we can decide what oiur next move shoudl be.

perl_geek
User Rank
Author
Re: Fresnel lens maybe...?
perl_geek   5/5/2014 2:25:27 PM
NO RATINGS
Two thoughts for the mass-production; 3-D printer to create multiple copies at once, or a CNC machine to mill them. (Out of a large sheet, so lots created per loading.) At least the machine wouldn't get bored.

Page 1 / 2   >   >>


Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Radio
NEXT UPCOMING BROADCAST

What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.
Like Us on Facebook
Special Video Section
Linear Technology’s LT8330 and LT8331, two Low Quiescent ...
The quality and reliability of Mill-Max's two-piece ...
01:34
The quality and reliability of Mill-Max's two-piece ...
LED lighting is an important feature in today’s and future ...
05:27
The LT8602 has two high voltage buck regulators with an ...
05:18
Silego Technology’s highly versatile Mixed-signal GreenPAK ...
The quality and reliability of Mill-Max's two-piece ...
01:34
Why the multicopter? It has every thing in it. 58 of ...
Security is important in all parts of the IoT chain, ...
Infineon explains their philosophy and why the multicopter ...
The LTC4282 Hot SwapTM controller allows a board to be ...
This video highlights the Zynq® UltraScale+™ MPSoC, and sho...
Homeowners may soon be able to store the energy generated ...
The LTC®6363 is a low power, low noise, fully differential ...
See the Virtex® UltraScale+™ FPGA with 32.75G backplane ...
Vincent Ching, applications engineer at Avago Technologies, ...
The LT®6375 is a unity-gain difference amplifier which ...
The LTC®4015 is a complete synchronous buck controller/ ...
10:35
The LTC®2983 measures a wide variety of temperature sensors ...
The LTC®3886 is a dual PolyPhase DC/DC synchronous ...