Sunday, April 25, 2021

Just a dumb little thing

I lock my bike with a Kryptonite Evolution mini 7 lock and cable. The lock comes with a bracket to carry it on the bike frame. It also comes with a couple little rubber "bumpers" that are supposed to keep the lock from rattling when it's in the bracket while you ride. Naturally, I quickly lost one of the not-so-tight-fitting bumpers and the lock was rattling up a storm every time I rode. That was really annoying because the bike is almost completely silent otherwise. I did what anyone with a 3D printer would do and I "designed" a printable bumper to replace both of the ones supplied by Kryptonite.

I made my bumpers fit tighter and a little longer than the original because the original still allowed some rattling. The tighter fit will keep me from losing it, and the additional height really prevents rattling.

Here's my "design":

I took advantage of the fact that holes print small and made the inside diameter 13 mm, exactly the same as the lock, which means it will fit tightly when it goes on the lock. The outside diameter is 19 mm, and the length (height?) is 8 mm (the original was 7mm high).

I printed a couple of bumpers using TPU filament in about 5 minutes. They fit perfectly and prevent all rattling!

Anti rattle bumpers- mine and the original.

New anti rattle bumpers in place.

Sunday, April 18, 2021

New Lights for the Kitchen

 My groovy, shag-a-delic pad in town had some small pendant lamps hanging from the ceiling to light up the kitchen island. They were not particularly interesting, and they didn't really seem to work with the industrial nature of the building, mostly because they were so small. I originally planned to replace the small painted glass shades with larger printed shades, but then I found a couple big aluminum reflectors for some industrial ceiling lamps at the makerspace in very good condition. 

All I had to do was clean the dust off them in the shower and design and print some simple brackets to allow them to mount on the hanging sockets that were already in place.  I made a few quick measurements and got to work in Fusion360. This is what I came up with:

I printed a pair of them in PETG and hung up the reflectors.

Here's one of the reflectors with the bracket mounted. The reflector is 435 mm in diameter at the bottom edge, and about 300 mm high. The reflectors have little horizontal grooves, almost as if they were 3D printed.

The bracket is extra beefy and absolutely will not have a problem holding up the reflector.

The bracket attaches with 4 plastic anchor screws using the mounting points that were already provided in the reflectors.

Here it is with a warm, antique looking LED bulb that's about 200 mm long. 

Here is a conventional type LED bulb. The reflector directs most of the light downward.

This bulb is a 300mm long 5000K type that is quite bright. The reflector tends to throw a lot of the light off to the sides as well as downward. It's a little harsh because the light shines directly into your eyes no matter where you sit or stand.

The is the island lit by the two new fixtures and a couple 800 lumen, conventional LED bulbs.

Here it is with the original lamp in the center also lit.

I think the original lamps were just too small. They didn't look right with the big ventilation pipe and the large rafters.

Two of the new reflectors throw plenty of light, so it's no problem if I can't find a third reflector. I haven't decided if I am going to remove the middle pendant completely or leave it in place.