I started designing a CNC router. The bed and beam are supposed to be cast from UHPC (Ultra High Performance Concrete) [german]. This is a very dry concrete mix with aggregates that increase its mechanical strength, and a plasticiser that makes it viscose enough to be usable for casting again. The end product can achieve mechanical properties comparable to aluminium and has very good vibration dampening properties.
The design uses 20 mm linear rails all 600 mm long. Ball screws on X and Y are 16 mm SFU and 12 mm SFU on Z. All bearing blocks are standard BK/BF style. Motor flanges are NEMA23. Drawn are JMC iHSV57 servos. The design would also allow to use steppers geared down with pulleys.
The main idea behind the bowl shape is to create a partially enclosed volume that allows to use flood coolant without creating a mess. It also raises the y-rails to an optimal height.
All bearing surfaces are metal pads that are glued into the finished casting and anchored with pins. This allows to achieve high position and alignment accuracy without the need for a large mill. If a mill would be available, milling the bearing surfaces after the glue-up would be ideal.
The port holes in the side are mounts for an optional 4th axis to enable mill turning. They also allow to attach dust extraction when milling wood and double as an all purpose bulkhead.
Two threaded rods put the beam under compression along the x-axis to increase its strength.
The Berlin based electronics online shop TinkerSoup is reselling electronic components of lots of tinkerers favorite companies: 4D Systems, Fritzing, Olimex, Pololu, Sharp, Smart Projects, Spark, Fun, ThingM, USGlobalsat, Adafruit
Seems the domain was sold to UK based Pimoroni
A great shop for tinkerers in Berlin is sertronics they sell online but have also a brick and mortar store. They are also an official raspberry reseller.
Two interesting articles on how to plan an aircooled PC by toms hardware. The articles talk about some thermal theories that might also apply to other technical systems.
A sci-fi short filmed by a Scottish art director has become what The Hollywood Reporter calls the “year’s first hot short.”
Ben Craig, 37, used the short film, titled Modern Times, as an exercise in on-the-job training. The DIY filmmaker “relied on the goodwill of friends, with the ultimate cost of the short being sandwiches and pints at the pub,” according to the Reporter’s Heat Vision blog.
Watch Modern Times and you’ll see a quiet, visually impressive meditation on the future. There are no exploding spaceships, no blue aliens and no lasers. And the decision to skip dialog and go with an operatic soundtrack definitely classes up the clip.
The short film has generated interest from studios including Warner Bros, Fox and Paramount, according to Heat Vision. A behind-the-scenes clip, embedded below, shows how Craig pulled off his Hollywood hit.