A 3D Printed Ballistic Chronograph for $70 – $100 USD!
This ballistic chronograph is based on my original design, the MK1 (which can be viewed at https://td0g.ca/2016/07/28/ballistic-chronograph/). I’ve used the MK1 to take many high-speed photos, including a shot of a mach-2 bullethitting a nice wine glass! The new MK2 has the same performance as the original, but is much easier to construct. It can be used for measuring high-powered rifles, paintball guns, and everything between!
While building my CNC mini-mill, I purchased a 500W air-cooled spindle from eBay. It came with a power supply, which looked great and I (falsely) assumed it would work perfectly on my home-built mill.
Boy was I wrong! The mill worked great as long as the spindle was turned off. Whenever the spindle was on, there was a chance that the mill’s microcontroller would reset (bad), lock up (worse), or would suddenly enter an infinite loop (really really bad!) and an axis motor would begin moving in some direction until I noticed and stopped it.
After much work identifying and rectifying the causes, the power supply has finally been tamed. Here’s a guide for anyone having the same issues.
Astrophotography is a bit of a money pit. I recently delved into it with my 80-200 f/2.8L and a home-built tracking mount. It was so much fun that I decided to buy a telescope! So my entire budget went into an 80mm APO.
The problem was that a telescope alone is useless for star pics – some quality infrastructure is needed. This post is about my attempt to affordably build the following components:
High-precision Tracking Mount with an ASCOM-compliant driver
Guide camera and scope to help the tracking
Portable Power supply
Telescope Focusing motor with an ASCOM-compliant driver
Note: As of August 26, 2019, the most incredible home-built camera rig award goestomingul’s 8-Degree-Of-Freedom robot! It takes up an entire room and can be given gcode to perform some amazing camera effects. My rig isn’t as cool, but much more mobile and simpler to build.
Camera sliders are fun tools to use for making dynamic timelapse videos, and they come with some cool features. This is a clever little gadget that moves like a camera slider but folds much smaller. Eggtimers are also commonly used to make a similar effect. Some high-end gear can slide and rotate the camera at the same time for a particularly cool effect. But how do you guild one that one that could go up to 11?
IREnE (Inverted Radial, Extension, Eggtimer) is not only named for the clever woman (nee Adler) who outsmarted Sherlock Holmes , but also the clever functions it can perform. The ‘Inverted Radial’ is the slider’s defining feature which doesn’t seem to be possible on any consumer camera sliders. It moves the camera in a circle around the foreground subject in a way that keeps the subject in view while the background view is constantly changing. Here are some examples: