Sunday, 13 August 2017

Maslow Arrival
 
My Maslow CNC router kit has arrived, so I have been making a frame for it. The frame is a one-off that fits on a wheeled trolley I made a while ago for sheet material storage. The dimensions seem to be absolutely correct for a Maslow frame, strangely, as I didn't build it with the CNC machine in mind.
The kit looks like this after it has exited the box.




The frame so far is a double A frame with some chipboard flooring for a sacrificial routing surface. (It's really cheap, which means it is comfortably sacrificial).


The A frame is constructed similarly to the standard Maslow frame, and I'm keeping the dimensions very similar even though I will be using smaller plywood sheets than the 8 x 4 foot sheets Maslow was designed for.
 
I'm planning on putting triangular motor mounts on the cross beam, hopefully they will be rigid enough for the motor/chain stresses. If not, then I'll look at a single beam across the top and supports. I'm using up a lot of material I have hanging around, hence a different design and varied materials.
 
3D Printing Failure
 
While attempting to make one of these:

I made one of these:

Shame it's not as useful.


Friday, 4 August 2017


A Bit of Leather Work

I made some new straps for this bag, using leather rather than a plastic version of leather that was originally used.






One of the original straps had just worn out:




While I was doing work on the bag, I also replaced the popper that was on a closing strap with a new one, as the old one had been bent out of shape:














Thursday, 13 July 2017

Canopy Fitting Fix

The canopy fitting that I remade in nylon was taken to Italy and tried out. The pivot bolt and nut were fouling on the part that this remade part fits into, so I have dropped the bolt and nuts by counter-boring the holes:



I used a 20mm Forstner bit to do this. The bolt and nut are now much lower and hopefully should easily clear the
other part:



I bought some stainless bolts, nuts and washers as I realised that the canopy is going to be used by the sea, and the original bolts were maybe not going to weather sea water exposure very well.

Wednesday, 12 July 2017

Distance Increaser

When washing nappies in the toilet it's always nice to have a distance increaser, or, to give it it's Latin name: A Pair of Tongs.
They keep your hands away from the juice found in toilets and allow movement of nappies without the brown tipping of fingers.

These can be made out of wood, and when made quickly out of offcuts of wood and a homemade hinge (old PC case) they tend to be crap.

When remade (from the same materials) they can be a lot better.


Special slider that stops the ends from missing as the tongs twist:


DIY hinges as the hinge pot was empty (made from old PC case sheet material):


In between the wooden bits, there's a spring, held captive by the slider:


It works a lot better.

Friday, 30 June 2017

The Wet Phone Affair
( or, How to Make Your Own SD Card)

One paddling pool plus one phone equals one project. After the phone was dried out it still didn't boot well enough to get stuff off it using USB. After all attempts to get the phone to boot had ended, there was one path left: take the flash memory off the phone and read it some other way. The phone was an 8G model and the flash was implemented using an 8G eMMC module. This is a common type of flash memory with a fairly standard pinout and form factor. The package used is a 153 ball BGA with pins on a 0.5mm pitch. Not all balls are connected, so it's definitely feasible to wire this device up and read the data off. Fortunately, as this is a eMMC device, it uses the MMC interface and so it is possible to wire the chip to look like a micro SD card.

So, I removed the chip from the phone PCB (hot air gun) and attached it to a micro SD to SD card adapter. Internally these are just wiring so there's ample metal inside to attach wires.

This is the internals after it's been wired up:



This device (Sandisk SDIN8DE2-8G)  has some things that I think are peculiar to itself. Some wiring hints:

D0 to D3 just wire to the appropriate SD card signals.
The CLK and CMD signals also wire directly.
The VCCI signal needs a capcitor to ground ( I used 200nF)
There's two VSS signals on this device and two VCCs. I wired both Vcc to the SD card Vcc and bot Vss to the SD card Vss.
I put a capacitor across Vcc and Vss. (1uF)


The wire I used was from an old transformer I dismantled, it has an insulating coating that needs to be scratched off to get a good contact. Thin wire is essential. A microscope is almost essential too, if just for inspection.


After wiring the SD card/eMMC arrangement, after a couple of false starts, it worked. The data was read with no errors in dmesg for a 7.3G dd invocation.

DIY SD card...





Friday, 23 June 2017

Vortoscope Sort Of


Vortoscope (Sort Of)

The vortoscope is an optical attachment for cameras which is similar to a kaleidoscope. I want to try to experiment with  one of these, so I decided to build a copy of the Leica universal polariser part that attaches to the lenses on the front of my M8.
The attachment is a circular ring that attaches to adapters that screw on to the front of each lens.

The basic ring:


I drilled some holes that will be used to mount various  front arrangements.




The first front attachment is a 3d printed holder for a prism from an old pair of binoculars I dismantled years ago.



The thumbscrews are used to  attach this assembly to the lens adapter disks. Using different 3D printed adapters I should be able to attach various different optical adjusters...