Today I finally got a chance for some quality time with the Dremel. I have decided to drive the arms directly with small 9g servos. This meant removing the square bar that connected them and carefully chopping away various protrusions, including the...
An alternative to reducing the weight (which, given that the servos + batteries currently comprise more than half of the overall weight, and cannot be reduced) is to design the frame + legs in such a way that the servos are not supporting the weight...
TL;DR - I built the first version of a leg: I have some goals for the the mechanical design of this open source robot - it doesn't help if you make an open source robot but it requires a $ 500 000 mold! These goals are: Use readily available manufacturing...
Thursday, 16:41, 15/12/202220/12/2022Sorry for the delay, for some reason my brain refused to work these last 5 days, so I didn't work that much on this project log as I wished to. 23/12/2022 For some reason, it seems like this Project log is so...
Powder tried:PowderResultPlaster + Talcum powderNot enough strength both immediately after print and after settingPlaster + sugar + dextrinIncrease wet strength, but very difficult to spread. Also very messy.Salt + dextrinGood wet strength, improved...
I just wanted to detail the construction of the portable device.For all point to point connections, see the schematic. For the most part.. Just build the schematic. Note. The button wiring may be different in the finished device, but this can easily...
Well I caved and purchased a mid tier Proxxon rotary tool and matching drill press and mini vise. I already had acquired a Proxxon KT 70 compound X-Y table before which works with the press as well.This tool is far more stable, with minimal run out compared...
The PCBs arrived today! They look great:So of course I had to try and insert all the switches and keycaps to see how they fit. The fit is (intentionally) tight, as I made them a bit denser than on a normal keyboard, but they seem to all fit properly:With...
For the actual gimbal structure, I used Actobotics aluminum plating and pattern adapters from Servo City. The entire Actobotics line uses 6/32 threads for everything that is threaded (except the weird stuff). For fasteners, I used the new 6/32 stainless...
I am going to break up the project into three parts. Physical build, Arduino work bench sensors, and lastly integration of all the systems. For the Physical build I first needed to find a toilet to work with. I went to eBay, I found...
We spent most of the weekend manufacturing the femur part of the legs + the new chassis, along with the coxa joints (where the legs meet the chassis). This post includes documentation on how this was done. (I apologize about the quality of...
Got around to thinking through the electronics, cable management and what to do about sensors. For X and Y both home and limit sensors are not a problem, for Z-axis I'll probably go with just a home sensor and skip the bottom limit switch - or use something...
Today was all focused on testing out the braking effects of a pulsed rectified sine wave on a motor. But to do such a test, we needed a circuit which would be able to switch fully rectified mains at a frequency several times higher than 60Hz. Our first...
At this point, it seemed to me that the entire project hinged on the viability of slotting in a new keyboard. If I couldn't get better input on this thing, there was no sense putting any more time and money into it.Now I've previously said that the PreComputer...
In my last project log entry I wrote about the various categories of particle fluids and the need for mechanical agitation during fluidizing for specific types of powdered materials. Additionally I walked through the designs of the magnetic stirrer that...