steve cooley presents

Alright, this jig I made to hold the dremel flex shaft horizontally worked *beautifully*. I hand-programmed the gcode, and I obviously have some more fine tuning to do, but overall, I’m on the right track!

Here’s the nice clean hole the jig produced. Adjustments required, but almost there.

Here’s the jig that’s holding the case down.

Video of the jig in action:

Alright so one of the last hurdles to jump before I’m ready for production is being ready to cut holes in the sides of the enclosures for the USB cable. I’ve been doing this by hand with a dremel with *extremely* variable results. :-/ So, when my pal Jim was up for a visit earlier this year, he helped brainstorm on some ideas and this was the concept we ended up with. Using the dxf files for the cnc machine, I was able to locate the hole pattern and design a new piece that will bolt on to the existing z axis gantry. This new piece, with the help of some shape lock, securely holds a flex shaft attachment for a dremel… Which in theory should let me jig a beatseqr enclosure to the table and cut nice clean square holes without and problems or sloppiness. In theory. But man, I’m getting really close to having the infrastructure in place to do what I want. Getting pretty exciting up in here!!

Pretty good! This case is a “scratch and dent” kind of situation, so I feel pretty good about how the silicone buttons turned out with the new casting mold.

Research and development continues with cutting (and recutting, and recutting) the new silicone button casting mold. I’ll be verifying the dimensions tonight, but things are moving along nicely. I may be able to get one of the new v4.51 boards close to fully assembled. Which I am very
much looking forward to. The last major task is to engineer a jig to hold a dremel flex shaft that will attach to my cnc machine. This will let me cut a hole for the USB jack with precision and repeatability on the case. After that, I’ll be able to kick into a higher gear for producing units and kits. Whew!

Fail.

a sea of machineable wax chips. This mold would end in disaster.

Present and future casualties of my learning process

Try number 3. This one went well after 5 days of chipping away at it.

Smooth-on dragonskin-30, a two part a/b platinum cure silicone, in the happiest place on earth: a beatseqr button mold

It. Looks. GOOD!

alrighty, then.. so I’m starting to get my bearings with how all the software works to run jobs through the blacktoe CNC router. I switched from cambam over to sheetcam and now I’m getting really good results. There’s still a certain amount of strangeness, probably all my fault, so I’m still learning what works and what doesn’t. Here’s a video I did to show how the blacktoe does with machinable wax:

The end result is a mold to use for casting translucent silicone into for use in my beatseqr project, as a replacement for the hand-cut-and-sanded acrylic buttons that I’m currently using. You never know how an experiment will really go until it’s over, and now that this experiment is over, I’ve learned a lot and will make a bunch of adjustments:

1. change the silicone product from tap plastics platinum cure translucent (way too wobbly for this application) to smooth-on sorta clear 40. I saw this product at the Maker Faire this past weekend and really liked the firm quality of the cured product. I think it will be a really good candidate. Smooth-on dragon skin 30 was my second-best candidate.
2. cut a new button mold using the techniques I’ve learned by doing this one.
3. adjust the height of the button to be not as tall as this test.
4. adjust the flashing surrounding the buttons to be not nearly as tall. I had it set to be 0.1″ tall, and that’s probably 0.08″ too much. all I need is for it to basically be thick enough to keep all of the buttons together, and that’s it.
5. think about how to diffuse the LED light going into the button… this new silicone is water-clear… so … I’ll need a way to adjust that quality so it looks good. maybe just a sheet of paper under the silicone flashing… we’ll see how that goes.

So… progress continues. I’ll post the result of the next prototype when it’s done.