I cut 2 rabbit buttons and left them alone in the workshop overnight and I came back to this pile of rabbits, weird huh? (svg here)
Friday, 18 April 2014
Wednesday, 16 April 2014
Tuesday, 15 April 2014
We ordered a whole bunch of Just Add Sharks flyers from Braunston Ltd for this years maker faires. I thought that it would be nice to make a little display stand to hold them vertically on the table so I designed and cut this. It's made from laser ply and the front panel is perspex. I deliberately avoided slot and tab design to give it a sleek look and the perspex on the front just slots into the gap (and would ideally be 20mm taller) (svg here)
Monday, 14 April 2014
I ran a useless machine workshop for Cambridge Makespace. There was a pretty good turnout for the Family makers group in the morning but 70% dropout for the afternoon session which was a bit of a disappointment. I blame the sunny weather. As usual I forget to take photos of these things and generally report about them but Dominic was also there this time and he's written up the experience over on this blog.
Saturday, 12 April 2014
The 'cog' has been added as a bit of a joke currency in the new Vale LRP game. I've taken the joke one step further and made the currency real so I can be rich when I go and play next month. :)
The cogs were created using Matthias Wandells excellent gear generator program (svg here)
Thursday, 10 April 2014
Remember that light bulb in the blue laser that I loathe so much? I already removed it from the machine but lighting is incredibly useful to see what's being cut. I wanted to add some LED lights for decent illumination but the existing wiring just connects 240V up the that light bulb fixing. I could have put an adapter in to bring the voltage down to something use able but then I remembered about an old LED light bulb I had pulled apart.
The bulb was pulled apart and the wires all extended to allow the panels to be placed in the corners of the lid.
Laser cut mounts were made to hold each panel at a slight angle in the corners of the lid. The mounts affix to the lid with a single nut. After my experiments gluing and taping things inside the lid all failed, bolting things in using the existing fixings is always preferable.
The panels were split into the corners of the lid and wired up to the existing electrical point. The lights always come one while the laser is turned on but as the LED only takes 7W it's not taking a vast amount of power.
Monday, 7 April 2014
Since I've been playing with foam again I took the opportunity to conduct some tests on thicker sections of foam.
The 12mm foam cut in a single pass, 25m/s and 30% power so super fast. The trouble is that the middle of the material gets really hot and starts to melt, drawing back from the beam, this causes the curve you can see on the edge of the cut. The 30mm foam was cut in multiple passes, 25mm/s and 15% power. As you can see the laser caused ripples down the edge of the material for each pass. Both of these are pretty much unacceptable for the majority of things.
The second problem is caused by the way the laser works. As the beam passes through the final lens it takes on an hour glass shape. The neck of this hourglass should be focused onto the surface of the material. As the beam passes through the material it gets wider again at the bottom of the cut the beam is noticeably wider than the top.
These two issues can actually be used to counteract each other. If you aim the focal depth at the middle of the material the narrowest point of the cut is the point where the material shrinks away the most. It doesn't work for much thickness but it does help up to about 10mm thick.
Sunday, 6 April 2014
This is a foam replica of the guard on the sword, Herugrim, used by Theodin in the Lord of the rings films. Again etched into LD45 foam, this will be latexed and coloured before being put onto a LRP weapon. I should hopefully get some pictures of it on the sword. (svg here)
Saturday, 5 April 2014
I have plans for this blue laser and I need to start by removing the things that I don't want in the machine any more.
- The laser power supply - this was broken when I received it, burnt out by the previous owner.
- The control system - goodbye moshi draw sadly this means taking out the stepper drivers too.
- The light bulb - honestly I don't know why this bugs me so much, it's just a silly thing to have there.
- The extraction fan - it's weak, ineffectual and it gets in the way of the laser cover.
- The clampy thing - also ineffectual I have plans to install a z axis in the same space.
With all these parts gone there is lots of room inside the case for all my desired modifications.
Thursday, 3 April 2014
Tree has been making these hand guards for stick fighting from leather. He decided it was worth getting a template made to simplify the cutting process. I forgot to take a photo of the first one and it broke in transit, turns out there was a scaling issue anyway (his fault) so I got a second chance to cut and photograph them. I cut one in acrylic as request and sent a second on in mdf because it's cheap and it would help protect the plastic one in the post. These two arrived safely.