As promised, the video of the roughing + finish operation on the finderscope-ring drilling jig.
Jari shot some videos during the milling of the beaver-tail bulb. They now appear on YouTube. For a mostly home-built cnc minimill of this size, this is pretty 'hard core' stuff...
As a first serious test-run for our now servo-controlled cnc mill we decided to make an IOM bulb out of steel. It ends up a bit bigger in volume when made out of steel compared to lead, but the difference isn't huge. Making it with a cnc mill allows designing almost any reasonable 3D shape [...]
Saturday, December 8, 2007
A fast but unstable way of radio-sailing.
Saturday, November 17, 2007
Some promising results yesterday with trying to stretch DNA molecules. The molecule is attached between two microspheres, and we are actively moving the smaller sphere while the force acting on the bigger sphere is being measured. The image and video shows the view through a 100x microscope objective on the optical tweezers instrument I am [...]
Jari upgraded the spindle motor to 1.5 kW and shot a few more milling videos. movie 1: movie 2: movie 3: movie 4: Finished parts:
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Jari has made an enclosure around our cnc-mill, and that allows us to use a liberal amount of flood coolant. Here's a short video with some tests in aluminium. Before you run to the shop and get an Opti-BF20 of your own please remember that our machine is seriously modified. We put a new table [...]
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Most conventional CAM algorithms are geometry-based. They create toolpaths that are usually parallel to either the coordinate axes ('zigzag'-paths) or to the part contour (contour-parallel, or spiral paths). One problem with this geometry-based stuff is that you don't take into account the cutting forces. The algorithm has no idea about how much material is removed [...]
I've worked on steering our Optical Tweezers instrument using Acousto Optical Deflectors. Here's an example of what it can do. We're trapping four 1 um silica microspheres in water using a single 1064nm laser that is time shared between the beads (it hops between them at a fast rate). Then we can program the AODs [...]
Last day at model-expo, my first try at using google video! First the new Futaba 2.4GHz radios. There are two wheel-model radios already on the market, and I was told two stick-radios (a 3-channel and a 6-channel model) will be in stores very shortly. Priced close to the Spektrum offerings at around 200 eur. Then [...]