Sunday, August 31, 2014

Another day, another thing

I broke the darned plastic finder scope rail on my C8 a few months ago when moving it and finally got around to making a new one.  Uploaded the design to YouMagine.

Sunday, August 24, 2014

Bicycle reflector and taillight mounts

This design is public domain and is available here on Youmagine.

I fitted a rear rack on my road bike and intend to use a trunk bag or garment bag there, both of which will block a taillight on my seat post, so I needed to mount my light elsewhere.

The rack has a good mount position, it's a standard reflector bracket.

The "reflector.stl" here will screw to a standard reflector bracket using the #8 screws in the BoM. The "pulseclip.stl" is a small clip that snugly holds an Axiom Pulse 60 taillight (I highly recommend this light BTW, great value for money and probably the best < $50 bicycle taillight on the market).

Note that there's no retention clip as such on this bracket, it does not "snap" into place, but it's quite snug and I feel it won't come out.  If this becomes a problem I will redesign.

I designed them as separate parts to be glued together to simplify printing. The SCAD can be modified if you have different size requirements.

The pulse clip has integral support for the top rail when printing. Make sure to check your toolpath before printing and make sure the support layer prints with proper bridging.  Slic3r didn't do it for me, I had to use Cura and cut down to 1 perimeter to get it to print right.

If using these two together, glue them together after confirming that they both fit your equipment. I used epoxy, Gorilla Glue would probably be fine too.

Note in the pictures I used a length of Spectra line to catch the light if it falls out.  I really recommend a safety tether on your bike's equipment, I've lost > $100 in taillights over the years by having brackets break or just slip off.

Saturday, August 9, 2014

Impromptu insect duster

I discovered a ground wasp nest the hard way while mowing today.  So tonight after they stop swarming around and go to sleep I need to deliver some insecticide dust to them but I don't have a duster.

But I do have an empty peanut butter jar, some thin plastic hose, an automotive valve stem (one out of an old bicycle tube would work fine too) and a bicycle pump.

I used a taper drill bit to get to the right size for both of these, you want a tight fit so take it slow.

Put the powder of choice in there, wait until night when the bugs are settled down, use the pump to blow the dust though the pipe and into the nest.

I've used this method before for various nests. When it was a large nest in the attic, I built a duster out of 4" and 1" PVC with reducers and used an air compressor with a blow gun nozzle on it to completely flood that part of the attic.  In that case I used diatomacious earth so that I wouldn't be pushing toxins into my house. When I need to go for a quicker kill I'll use Sevin dust, and boric acid (Roach Prufe) works well too.

New printer: JGAurora A3

This week I decided I'd had it with all the other printers in my stable.  The CTC is stable and decent but it just bugs me (can't st...