Wall-E gets back on track

A simple cable tie comes to the rescue again.

Cast your minds back to 2008, and you might remember Wall-E, a Disney Pixar animated film set in the 29th century, where mass consumerism and environmental disregard have turned Earth into a literal wasteland. I’ll let you Google the rest of the plot yourself, but suffice to say that the film’s protagonist, Wall-E or Waste Allocation Load-Lifter; Earth class, is one of the cutest robots on the big screen. While the film’s environmental messages are extreme, there are clear warnings about the way our species generally looks after its home which were provoking twelve years ago, but are now ever more poignant in 2021.

No one does cinema merchandise quite like Disney, and it’s not without a slight sense of irony that the company produced many Wall-E related products to accompany the film’s release, all around the world. I wonder what proportion of those items are now in landfill? Something to ponder over a cup of tea or two.

Wall-E and I have quite a bit in common as we both have a penchant to collect discarded items. It’s not unheard of for me to collect broken objects from skips and from the side of the road, but that’s a blog entry for another day.

A local Worthing lady got in touch to ask if I would repair her much beloved Wall-E robot. How could I resist? A broken toy robot in need of some TLC, what’s not to like.

Make and model: Mattel Remote Control Wall-E

Fault reported: No drive on one side/ track

Cost of replacement machine: £75.00 (Amazon.co.uk, December 2020)

Manufacturer support: 0/10

Cost of parts (for this repair): 1p

My time spent on the repair: 1 hour

Tools needed: Screw drivers, pliers, cutters

Sundry items: None

Cleaning materials: Silicone spray, damp cloth

Repair difficulty: 5/10 (fiddly)

Beverages: 1 X tea

Biscuits consumed: 1 ginger nut (and maybe a slice of cake)

Just to warm you up, here’s a cool little slideshow

Being frank with you, I had my doubts with this one. Toys like this contain lots of small, fragile parts with little in the way of easy service access. My chances of success were 50/50, so I was going to need a bit of luck.

Wall-E’s tracks allow for movement forward (straight along) and also degrees of clockwork rotation. Wall-E isn’t supposed to turn left and right, strangely enough.

The problem with this Wall-E was that ‘he’ (I think) would only move around in circles and would not move forwards. Dizzy stuff. This was because one of the tracks wouldn’t move when operated by the remote control. Time to dig out the screwdrivers.

Mattel’s Wall-E comes apart in a fairly modular fashion. Things like the battery cover, main base cover, motor, gearbox and electronics are all neatly housed within the toy’s chassis, and it’s all held together with simple self-tapping screws. This meant that I at least stood a decent chance of getting the robot apart, without causing more damage. Often with toys like this, parts are clipped or glued together, making disassembly a fairly destructive affair. Dismantling this toy was fairly routine, luckily. Despite this luck, I knew that no spares would be available from the manufacturer, so extra care and tea were still needed.

The reason the track wouldn’t rotate was because whatever it was inside that was meant to drive it, was no longer doing its job. The motor was whirring when the ‘forward’ button was operated, so one could assume that the issue was likely to be mechanical. Things were looking up.

Two gearboxes operated by a single motor, propel the toy along or around in a circle. Depending on the direction of the motor’s spin, one or both gearboxes engage to drive the robot’s tracks. Upon inspection, this ‘motor-gearbox action’ was working well, but the output from one side was not turning, the side with the faulty track. Bingo!

The affected gearbox was simply held together with small self-tapping screws, which meant easy dismantling. At this stage I was wondering what I’d find inside. A shredded gear, pieces of plastic all over the place? Any of those things would have spelled disaster, so I was pleasantly surprised when all I saw was a small crack in the main output cog, which drives the track. Getting a small cog to match the damaged one might have been possible, but would have taken time and a lot of patience. I mean I’m fairly patient, but even I have my limits. As the cog hadn’t totally split in half, I simply put a small cable tie tightly around the cog’s shank. I’m sure you would have done the same.

After a little cog-fettling and a little trim of the cable tie with a sharp knife, I returned the repaired cog to the gearbox, with my fingers crossed.

Reassembling the gearboxes, motor and other gubbins to Wall-E’s interior was pretty much the reverse of what I’d done so far, taking care to lubricate things like track belts and sliding parts with a little silicone to ensure smooth service.

There was some evidence of previous battery leakage damage to a couple of the battery contacts, so a little battery compartment spring-cleaning with contact cleaner and an old toothbrush was required before new power was installed. Never throw away your old brush, they’re just so handy for cleaning in those hard-to-reach nooks and crannies.

I had all fingers and toes crossed before firing up Wall-E with fresh batteries for the first time. There were a lot of small fragile parts in Wall-E, and it wouldn’t have been inconceivable for me to have broken a wire by mistake. Fortunately, Wall-E sprang to life, and for the first time on my watch, went along in a straight line. How long would my cable tie fix last? Well, all I can say is that I gave the toy a thorough testing around the kitchen floor maybe once or twice before handing it back to the owner.

Time for a celebratory cuppa and ginger nut.

FixItWorkshop, Worthing, January’21, Wall-E running well!

Poorly Scalextric Sport Digital Lap Counter (C8215)…

Scalextric C8215 lap counter repaired in the workshop…

First off, I must confess, that this is part of my own Scalextric collection, not part of someone else’s.  I’ve always enjoyed slot car racing and a lap counter is an essential addition to anyone who wants to prove that they’re the fastest around the track!  Trust me, it can be very addictive, especially when racing against one’s better half.

IMG_4854
FixItWorkshop, Dec’17, Scalextric Lap Counter C8215

Anyway, I wanted to share this little repair in the hope that others might benefit.

My once reliable lap counter started to miss laps on lane two at very crucial stages of a race.  It started by only happening occasionally before completely missing several laps in a row, forcing a stewards’ enquiry to settle the race finish times.  Lane one was fine.

Time to get out the screw driver and delve in to the workings of the timer.  Once removed from the main track layout, the back of the unit has a cover which is held in place with six small self-tapping screws.  These come undone easily and removing the back reveals two sets of electrical switch contacts, operated by a lever on each track, just under the slot car rails.  The idea here is that the slot on the slot car operates the lever as the car passes the lap counter track piece, operating the switches contacts, completing a circuit, thus counting the laps.

Comparing the switch contact clearances, lane one’s was considerably closer than lane two’s.  This means that the ‘dwell’ time on lane two’s switch would be less that the switch on lane one, which was working ok, meaning a possible cause of the problem.  To anyone who’s adjusted contact breaker points on an old car, you’ll know what I mean here.

I had no idea what the correct clearance should be, so took an educated guess and closed the gap to about 0.5mm, done by eyesight alone.  I made sure that both sets of switches were the same (see photos).  While I had the counter in pieces, I cleaned the contact surfaces with a little electrical contact cleaner, just for good measure.

After re-assembly and re-fitting to the track, a few test laps with my fastest race Mini, proved that the counter was working as it should once again.

Cost of a replacement counter (second hand) circa £12.  Cost of the repair; 10 minutes tinker-time.