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Arm design
Log from Robotic Flexor
Antagonist solenoids Much like muscles, a simple solenoid can only move in one direction. The idea is to have two opposing solenoids pulling in opposite directions just like flexor and extensor muscles in an arm. This comes in handy when trying to hold...

Mistakes were made
Log from Robotic Flexor
In my last post, I show how I thought I could solve for the magnetic force of a solenoid. I decided to use the equation of a solenoid with no core as the magnetic energy and find the force by plugging in flux density B of a solenoid with its plunger...

Tests
Log from Mach Effect Thruster Xperiments
The test setup for the Kocylator-Engine (Woodward thruster) is ready: It is a balance scale, capable of measuring with a resolution of 0.0001 grams - theoretically. It´s oscillating around +/- 5mg, but the oscillation is slower than the immidiate...

Updated Design with Grips
Log from Strong Arm
The grips are based on 3/4" aluminum square tubes. The predicted squeeze strength is around 40 pounds.What about safety? Using PyUltimateRobot (see that Hackaday page), one can limit maximum force of any component of any movement. For example, you can...

Measurements!
Log from Lightbix
I used a piece of wood to tape to the blinds stick and a scale to measure force. Not as good as a torque wrench but whatever.The wooden lever was 3.25" for the center of the blinds stick. Max force applied was 90 grams.So thats a torque of 10.3 oz in...

Looking Good
Log from 3D Printer Extruder Remote Health Monitoring
Indirect Force Sensor Test Set-UpSo, the new indirect filament force sensor now piggybacks on the direct filament force sensor. The new sensor turned out to be light enough to be supported entirely by the PTFE bowden tube, so no extra bracket needed....

third attempt with slide potentiometer
Log from AutoGraph
It took three attempts but I believe I have arrived at a viable method to control the amount of force between the pencil graphite and paper. This third approach uses a slide potentiometer and two springs. The springs are placed between the driver...

Many Small vs One Large Solenoid?
Log from Robotic Flexor
The idea If you have one solenoid that produces a single force. You can of course double this force by having two of the same sized solenoids next to each other pulling up on the same object. This of course will use up 2 times the amount of current though....

A dice with LabDroid
Log from LabDroid
Today I did a simple dice with LabDroid: function getRandom(max) { return 1+Math.floor(Math.random() * Math.floor(max)) } let force = 0.0 let rolled = "" while(true) { const accel = $in(0) force += Math.abs(accel.x) + Math.abs(accel.y) if (force > 100.0)...

We've got sensor readings, Skipper
Log from 3D Printer Extruder Remote Health Monitoring
3D Printer Extruder Filament Force Sensor Design ComparisonFirst test shows sensor readings that are surprisingly similar from both sensor designs. Both Processing graphs were running side by side while printing an airtripper extruder part. More testing...

Beta Prototype
Log from The Bit
After trying out several combinations, I decided on the following sensors for the beta prototype:Optical surface trackingTime of flight laser displacementBarometric pressure+temperatureDifferential force (front to back)Partially Assembled:Getting...

First quick preview
Log from mini (Pi)QWERTY USB keyboard
You can adjust button height with spacers between boards. Of course you can use any button sizes an colors,this button height is hard explainable (etc. my distributor have only this height with 1N switch force) but on real device is very interesting,...

Buttons
Log from Solder paste and flux dispenser
For dispenser it's important to have soft control button. Because if you need to apply big force, needle may shift out of small pad. There 2 main parameters:Operational forceButton formHuman skin is "soft". To be convenient, button should have big height...

Calculating the Speed with a 50 gallon Reservoir
Log from Water Bot
While I am waiting on my components, thought I would do the math to figure out how fast the bot would travel carrying 50 gallons of water (400 lbs) in a reservoir.Wheel size: 6 inches diameter. Wheel size sprocket:3 inches OD. Motor size sprocket:2 inches...

Well, it works. Mostly.
Log from Anti-sedent Alarm, or Get Up, Stand Up
It works. It does what it's supposed to, as long as I'm sitting on it properly. Sounds like Apple made it, no? Except they'd make the pad white.I changed the code to make the red light come on when I'm supposedly sitting on the FSR. For some reason,...

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