[Lab] [ORE_bits] RE: laser mirror holders

Thu Nov 4 14:57:43 EDT 2010

I think most of the time the laser will be running at 10W or so.

But I think a strong case has been made against plastic with your point and
also the previous point about deformation over time.

On Thu, Nov 4, 2010 at 2:55 PM, krazatchu . <krazatchu at hotmail.com> wrote:

>
>
> Mirrors are not perfectly efficient...
> At 100w, even small inefficiencies will be significant...
> Poor dissipation of even half a watt of heat can cause some serious
> localized heating...
>
> At higher powers, the laser mirrors are water cooled....
> I have no idea of exact numbers however, nor what search terms would
> reveal...
>
> Michael
>
>
>
> ------------------------------
> From: darcy at siteware.com
> Date: Thu, 4 Nov 2010 14:44:52 -0400
> To: themumbys at gmail.com
> CC: lab at artengine.ca; ORE_bits at yahoogroups.com
> Subject: Re: [Lab] laser mirror holders
>
>
>
> pretty well an inch. They say they are 1" or 25mm. Pretty thin. Like a mm
> or so.
>
> I don't think it heats .
>
>
> On Thu, Nov 4, 2010 at 2:43 PM, Paul & Andrea Mumby <themumbys at gmail.com>wrote:
>
> exactly 1" circle?
>
> Also what is the approximate thickness of the mirror?
>
> And to your knowledge does the mirror heat up during use (and if so to what
> approximate max temperature)? I would assume they are designed to fully
> reflect the wavelength your laser operates at, but if they heat beyond a
> certain point we need to consider the thermal stress on the printed parts,
> since the thermoplastic used in 3d printing softens at a fairly low
> temperature (both PLA and ABS) I would need to compensate for that in the
> design.
>
> Thanks!
>
> - Paul
>
>
> On Thu, Nov 4, 2010 at 2:00 PM, Darcy Whyte <darcy at siteware.com> wrote:
>
>
> It should be easy to drill and tap into a cupcake part if needed. If you
> have a better idea, cool....
>
> The mirror is a 1" circle.
>
>
>
>
> On Thu, Nov 4, 2010 at 1:58 PM, Paul & Andrea Mumby <themumbys at gmail.com>wrote:
>
> I assumed it didn't need to be the same as the ebay one, but that gives me
> an idea of the mechanics, so I know what type of behavior I'm emulating...
>
> I'm not sure about the threaded hole idea, but I'm sure I can get something
> equally as effective from a printed part for sure.
>
> If you can bring the existing one that would give me another hands-on
> example, and I could take some pics of it too to use for reference... is the
> mirror itself circular? or square?
>
> I'll let you know shortly if we can meet tonight.
>
> - Paul
>
> On Thu, Nov 4, 2010 at 1:27 PM, Darcy Whyte <darcy at siteware.com> wrote:
>
>
> The mirror holder on my cutting head has a 1" threaded hole. you slip the
> mirror into the hole and there is a threaded circle that you screw in to
> pinch it down into the hole.
>
> If we are able to meet tonight I'll bring that one.
>
> It doesn't have to work the same as the one on ebay. As long as it can hold
> the 1" mirror and be tilted for adjustment (through a screw or something to
> make it accurate).
>
>
>
>
>
> On Thu, Nov 4, 2010 at 1:23 PM, Paul & Andrea Mumby <themumbys at gmail.com>wrote:
>
> Ok, so if I get the mechanics from those photos, their particular design
> has the flat square bracket (with the circular hole) which would be the
> plate which the mirror itself would be fixed against. This pivots on a
> ballbearing in the corner of the L shaped bracket, with 2 center springs
> under tension, which keeps the corner set screws under compression, allowing
> you to adjust the X and Y tilt, the L shaped bracket has 2 holes one in each
> "arm" which I'm assuming are for mounting the whole apparatus to your
> machine...
>
> I'm not sure how the mirror is affixed to the flat plate with the circular
> hole, they mention plastic tipped screws, but I don't see that anywhere in
> the pic, but I might be missing that... Either way if my above assumptions
> of the mechanics are correct, I should be able to mock up a design for this
> quite easily...
>
> If you have any other input to offer that might let me get something mocked
> up in time to show you tonight.
>
> I'll confirm with my wife when I get home from work if tonight is ok for a
> quick meeting, and if she's ok with that then I'll email you and confirm
> timing and such early this evening...
>
> Does that work for you?
>
> Thanks!
>
> - Paul
>
> On Thu, Nov 4, 2010 at 12:44 PM, Darcy Whyte <darcy at siteware.com> wrote:
>
> Did you follow the ebay link I sent?
>
> Okay, we can meet up tonight later if you want. Just send me the address at
> time to darcy at siteware.com. I can probably come around 9 or just before 10
> for a quick meeting.
>
>
>
> On Thu, Nov 4, 2010 at 12:41 PM, Paul & Andrea Mumby <themumbys at gmail.com>wrote:
>
> I'm in Bayshore... My house and workshop are a bit of a disaster area
> lately though lol... I think my wife would shoot me if I invited someone in
> right now :)
>
> Either way, we could meet quickly to discuss your options, if you have some
> hand sketches or something of the parts, and bring along some samples, and
> dimensions, I could mock something up tonight/tomorrow, and we could discuss
> it more at the faire... your right in that there might not be a ton of time,
> but I was surprised how easily the design/testing cycle works now that I
> have rapid prototyping capability... Small parts take 20min to print or
> less, so I can easily whip up a design in an hour or less, print it, and
> take an iterative design approach to something that is normally much more
> monolithic... It wastes a bit more material, but since material costs are so
> low for the plastic filament, it's totally worth the agility gained in the
> design process...
>
> Let me know what your thoughts are and we can talk about it.
>
> I'm a bit busy tonight and tomorrow, as I also have some paperwork to catch
> up on for my home business, and some other todo items to deal with (I've
> been multitasking between print and other stuff) but I could probably afford
> an hour or so either tonight or tomorrow between 8pm and 10pm to discuss
> options. Otherwise we can talk at the faire and meet up sometime following
> that if that works better.
>
> Even an email with some sketches/dimensions and pics of parts and so on
> might let me mock up something quickly if that's preferable as well.
>
> Thanks!
>
> - Paul
>
> On Thu, Nov 4, 2010 at 12:26 PM, Darcy Whyte <darcy at siteware.com> wrote:
>
>
> I would think that there wouldn't be much time to do it during the Maker
> Faire. The printing would be easy but the design (and any experiments) would
> take a while.
>
> I think the plastic cost is cool.
>
> Where are you? If you want to try some test runs, I could drop by if you
> want.
>
>
>
> On Thu, Nov 4, 2010 at 12:18 PM, Paul & Andrea Mumby <themumbys at gmail.com>wrote:
>
> There will be several 3d printers at the maker faire, I would bet you could
> have mirror holders made at the maker faire with enough
> bartering/negotiating lol... 1" holding brackets wouldn't take long to
> print, it would mostly be design/testing time that would consume the most
> effort...
>
> I'd be fine with printing them for you at maker faire for cost of plastic
> used (which would be minimal, hell I would likely do it for free depending
> on the volume of plastic). provided we have the time/resources to design the
> parts. I'm sure a lot of the other guys will have more Industrial Design
> experience than I do though.
>
> Anyway, point being there will be at minimum 5 3d printers, and possibly as
> many as 7-8 at the maker faire. So between all of them I'm sure your parts
> could get done ;)
>
> Also there is talk about kickstarting the RepRap Loaner program at the
> ottawa Maker Faire, so we will be trying to build a reprap mendel at the
> faire, and use it as a community loaner model.
>
> I've been working on printing parts to have at the maker fair in the
> evenings this week (just for examples) so if you have a design in mind, or
> some info, perhaps I could run a few off as tests tonight or tomorrow, and
> bring them along, get a bit of a head start.
>
> Let me know.
>
> - Paul
>
> On Thu, Nov 4, 2010 at 11:55 AM, Darcy Whyte <darcy at siteware.com> wrote:
>
>
> I'm now wanting to make mirror holders. The mirrors are 1". I need two of
> them. They should have a tilt adjust.
>
> Any ideas?
>
> The artengine makerbot? What is the status of that? What is the procedure
> for booking it?
>
> I'd like to try and have them done before Guy and I are finished making the
> mounting brackets for the laser tube.
>
> Here are some mirror holders on ebay:
>
> http://cgi.ebay.com/2-Thorlabs-1-Optic-Mounts-Holder-Laser-Mirror-Lens-/160361359773?pt=LH_DefaultDomain_0&hash=item255648299d#ht_1115wt_869
>
>
>
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