James Stanley

Posts tagged '3dprinting'

Tagged: all | 3dprinting | bitcoin | smsprivacy | electronics | puzzle | chess | pikon | tor | cryptography | ipfs | lawnmower | science | steganography | ricochet

My Arduino-based industrial process controller »

Sun 1 September 2019

For my 3d metal printing project, I need the sintering furnace to stick to a pre-defined temperature profile. Unfortunately, the controller that my furnace came with only allows you to set a constant temperature. It maintains a constant temperature very well, but the operator frequently has to manually update the temperature in order to stick to the defined profile. Read more »

Home 3d metal printing: first results »

Mon 12 August 2019

A couple of weeks ago I learnt about an interesting 3d metal printing process, from a company selling it for $100k USD, and speculated that it might be DIY-able for much less. Well I now have some promising first results. Read more »

An interesting 3d metal printing process (help wanted) »

Sun 28 July 2019

I recently learnt about the Markforged Metal-X 3d printer from a post on 3DP Reviews. It costs $100k USD, and can print metal objects. As far as I can tell, it is essentially an ordinary FDM printer, with a special filament that contains a high percentage of metal powder held together with a "binder". After printing, the part is washed in a solvent to remove most of the binder, and finally it is heated in a furnace to sinter the metal powder together. Read more »

How to make a rev limiter with an Arduino »

Mon 22 July 2019

My racing mower has a tendency to over-rev on long straights. To avoid damaging the engine, we have been lifting off the throttle, but a more reliable solution would be an electronic rev limiter. I did buy a commercial rev limiter made by AccuSpark, but was unable to fit it to my mower because the AccuSpark unit needs access to both sides of the ignition coil, and my ignition coil is inaccessible, inside a black box with all the other ignition electronics. So my solution was to make a rev limiter with an Arduino. Read more »

Puzzle Drawers »

Sun 17 March 2019

For the last ~3 weeks I've been working on a chest of drawers. This is no ordinary chest of drawers, they are puzzle drawers. The idea is that the puzzler is presented with one of the drawers already open, and the goal is to manipulate the chest into a configuration where all of the drawers are closed. With a typical chest of drawers, this would be easy: just close the drawer that is open. In the puzzle drawers, there are 3d-printed internal mechanisms linking the drawers together. Read more »

The Wheatstone Cryptograph »

Fri 15 February 2019

A few weeks ago I came up with an idea for a simple encryption device, then found that it had already been invented by Sir Charles Wheatstone around the 1860s. I ended up designing and 3d printing a replica of Wheatstone's cryptograph. Read more »

Towards a Better Pythagorean Cup »

Fri 4 January 2019

There was an article on Hacker News the other day by David Richeson entitled Make Your Own Pythagorean Cup. A Pythagorean cup is a cup with a built-in siphon. Supposedly invented by Pythagoras, the cup functions just like an ordinary cup as long as it is only filled to a certain level. If anyone gets greedy and tries to take too much wine, the level rises above the top of the siphon, which causes the siphon to self-start, and the greedy person is punished by having the entire contents of the cup dumped into their lap. Read more »

First Light in the PiKon telescope »

Sun 16 December 2018

On Thursday night I had an opportunity to try out my motorised PiKon telescope for the first time. Emma and I drove to a cemetery that is about 5 minutes away. It is not an ideal astronomy spot, but it is better than our back garden as it is a bit further from trees, tall buildings, and street lights. Read more »

My PiKon telescope hardware »

Mon 3 December 2018

Since the last post I've been working on the hardware of my telescope. I think the hardware is basically done, I just have a bit more software to write, and then need to wait for a convenient and cloud-free night in which to try it out. Read more »

Ramblings About a Computerised Telescope »

Mon 19 November 2018

The PiKon telescope is a brilliant design for a cheap but powerful telescope using 3d printed parts and a Raspberry Pi. It is a Newtonian reflector telescope, designed to be mounted and aimed with an ordinary camera tripod, and then the Raspberry Pi camera is used to capture images. It uses a relatively inexpensive concave "spherical" mirror for the primary mirror, and has no secondary mirror: the Pi camera is small enough that it is simply mounted in the centre of the tube and captures light where the secondary mirror would normally be placed. Read more »

Introduction to Isopath »

Sat 30 June 2018

Isopath is a game invented by YouTube user pocket83. The game was initially presented in this video where pocket83 shows how he made the board and tiles, and then explains the game rules from 15:45 onwards. Isopath is a zero-sum, turn-based, deterministc, perfect-information game, which puts it in the same class as games like chess, draughts, go, noughts-and-crosses, etc. Read more »

My homemade ebike control panel »

Fri 1 June 2018

I wrote before about dismantling the control panel from my ebike to find out how it works, and had some ideas for an improved design. Read more »

I designed a trick chess piece with hidden compartments »

Sun 4 February 2018

It's quite easy to model a traditional chess piece (apart from a knight) using CAD software. You basically just have to draw a sketch of the outline and revolve it around its centre. I modelled, and 3d printed, a Queen that includes some hidden compartments for storing small bits of paper, e.g. containing passwords or Bitcoin keys. Read more »

Magnetic cubes puzzle: In practice »

Mon 22 January 2018

I've put together a physical version of the magnetic cubes puzzle and have spent a good few hours playing with it. (You don't need to have read that post in order for this one to make sense, but it might help, and it's certainly worth having a look at the table that labels the different cube configurations). I haven't yet managed to solve it without consulting a computer. Read more »

How to control a digital speedometer »

Tue 12 December 2017

As part of my YX140 scooter project (now finished) I discovered that the scooter's speedometer is controlled digitally. There was a sensor in the original engine which generated pulses to signal the speed of rotation of the gearbox output shaft. The new engine has no such sensor, so I had to do a little electronics to make the speedo work. Read more »

How to create 3d-printed stencils for spray-painting »

Mon 3 July 2017

I wanted to make some custom spray-painting stencils. I've done it before by printing on paper and cutting out the shapes, but found it to be laborious and time-consuming. Also the stencils don't last for more than a couple of uses before the paper gets too soggy. Read more »

I bought an extremely cheap 3d printer and it's great »

Wed 25 January 2017

I had a look on eBay last week to see what sort of price 3d printers are going for these days, and was surprised to find some on offer for £150. At that price it's obviously not going to be very good, but should be fun anyway. Read more »


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