[Fab] oh hi i am cutting an acrylic in your dj booth

Sean Cusack sean.p.cusack at gmail.com
Wed Mar 2 23:03:14 UTC 2011

If you're getting some tapering on the laser, I've found that its typically
a power + focus thing (my best guess is that you're having some kinda weird
index of refraction problem, but I haven't actually run the math to see if
differences in air to acrylic N(i)'s could cause that problem).

My suggestion - go lower power (and lower speed) with 3-4 passes maybe.
Maybe focus the last couple of passes on the bed as well...it should help
out I think I think I think.

I have yet to use the laz0r in the space because I don't have a windows
laptop...damn. One of these times, I'd love to bum someone's 'top and try it
out on some of the stuff that I've got some experience cutting to see how it


On Wed, Mar 2, 2011 at 2:47 PM, miloh <froggytoad at gmail.com> wrote:

> Hi folks,
> reprap & 3d printing update:
> https://www.noisebridge.net/wiki/Makerbot
> I've been working on the Noisebridge cupcake CNC, 'Nutjob' and it's
> running well now.     If you want to use it, it's at the reception
> desk.  The noisebridge cupcake is the one labeled with a Noisebridge
> asset label. The build platform is a bit wobbly because it's thin and
> got the old narrow Y axis screw spacing to mount to.  .  I've had
> prints ruined with X axis skips mid way through prints, but we need to
> print more to confirm if that's going to be a recurring problem, so
> get printing.  Things to print:  lowrider parts for Gian-Pablo (thanks
> to him for getting Nutjob running again), optical covers for the
> Microscope (i'm drawing these up in openscad)
> Things to monitor visually and audibly while printing:
> Extrusion
> is the nozzle extruding, is the filament feeding (look for the
> movement past the tightened delfin plunger), is the filament siezing
> (check the loops feeding the cupcakeCNC from the spindle)
> Movement(are the XY and Z stages moving freely, are the electrical
> wires clear of any friction points)
> The temp I recommend to dial in for a print is
>   Extruder: 210C
>   HBP(Heated build platform):120C
> Some laser engraver report back:
> The red diode laser spotter is getting really hot.  "It's juiced!",
> Mike Kan says while pointing at it with his hip-mounted FLIR.  We
> should check what kind of voltage it gets and make an appropriate fix
> to limit or replace the device.
> Whatever kind of water we are circulating to cool the laser (tap or
> distilled), it gets hot with use.  It was at 78C (checked with FLIR)
> after some vector cuts last night.  I'm going to get hoses from and to
> the sink and copper tubing to keep it at a consistent & proper
> operating temp.  Tastebridge could use this too for cooling wort type
> things.     I'll get the 1/4 copper tube and nylon tupe or garden
> hoses plus attachments, and report back later.
> I didn't have good results with vector cutting acrylic 1/4.  Tapering
> and burning.  I was cutting at 10% speed, 80% power(12mA ), and 2
> passes (focusing on the surface for both passes).  We discussed doing
> 1 pass then refocusing at a lower depth, which I will try a bit and
> report back on.  I may back off from trying any vector cuts in 1/4
> acrylic, this device may not be up to it.  Let me know if I should
> stop already.  From what I've seen the 1/8 and 1/16 cuts look fine.
> Q:
> Anyone else experience paths getting deleted between Inkscape and the
> FSE printer driver?  Had to reorganize parts many times to keep paths
> from getting deleted.  Is the output page boundry is far smaller than
> the ~12"X16"  size of the bed?
> (I was printing the makerbot MK5 plastruder upgrade linked below)
> http://www.thingiverse.com/thing:3290
> http://www.thingiverse.com/download:9718
> -rma
> _______________________________________________
> Fab mailing list
> Fab at lists.noisebridge.net
> https://www.noisebridge.net/mailman/listinfo/fab
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