The mother of all videos!

The quest continued today, despite my back injury to build the front door unlocking mechanism. There were plenty frustrations today! I'm in no way going to throw the towel in on this one. Even if what I come out with costs way more than anybody else's solution, I will perservere.

Today was fraught with difficulty. Yesterday or the day before, I'd reglued the end of my wire to the brass tube. After I'd finished winding the coil, the damn glue failed again! So my nicely wound coil suddenly sprang loose and ended up looking more like a slinky than anything else. Wrapping tape and spraying glue ended up with a loosely wound coil that's definitely not to my liking. I might re-wrap that coil another day.

Next, I connected a pp3 battery clip to the two wires. That was a challenge as the enamel on the wire was extrordinarily thick. Normally it's easy to burn through with a soldering iron. This was most definitey not easy and had to be scraped off.

What I'm trying to do is to rig up a method of lifting the latch that holds the front door closed without going to extremes such as electric garage door openers that require the door to be both opened and closed electrically or other severe methods such as replacing the entire door assemly. This is such a simple thing to do yet is proving to be extraordinarily difficult!
 
The upshot of today's work (which I'll probably have to redo) is that I did manage to make a rare earth permanent magnet move out of my coil. It had little to no actual power behind it which is a major problem. I'm currently running it off 6v. I'll have to try raising the power to 12v but this is not currently looking promising. I have found that I was correct in using a permanent magnet with my coil however. I suspect I might get more luck with more power and possibly extra coil windings.


As you can see - it's not that powerful even though it is spectacular. It looks to have the right amount of throw to open my latch - just not yet enough power.

Mechanics Magazine 1853

In my quest to build a latch opener for my bus I had a brainwave and consulted Mechanics Magazine from 1853. Yes - a publication I downloaded as a free eBook. On page 52 was an article about an oscillating telegraph arm that used two magnetic coils and two permanent bar magnets.

The original telegraph machinery was largely constructed from brass. In my case, it'll be aluminum as I have quite a surplus of aluminum. Indeed, perhaps the permanent magnets I bought the other day sliding inside a plastic tube around which is a coil I could wind would be the solution.

I don't anticipate the plastic tube having an eternal life but tube and wire are cheap. I'd also estimate the tube lasting at least a few months until it could be replaced with copper or brass. But I'm getting ahead of myself.

Today was another day of zero progress. Aside from stepping outside to check m'ladies chickens for eggs, that was the extent of my exertions. My virus had taken over. It's like a very light version of flu (I'm glad I had the flu vaccine). I'm getting tired of being ill at weekends and not being able to work toward completing my bus project.

Lol. What a load of plonkers!

Out of interest, I had another look at the bus conversion forum online. Yup... They're still mostly plonkers. I put a simple question about paint and had answers from the outlandish to the ridiculous. Not one could name a barrier primer nor the best value economy top coat yet they all claim to have busses and all claim to have repainted them!

Today I visited Tractor Supply. I didn't buy much. In fact I spent less than $10 but in addition to 100 10-24 nuts and two M4 bolts. I got some 1\4x20 bolts, nuts and lock nuts. Thinking about it, I'd probably have been better off buying all my nuts and bolts from Tractor Supply as they sell them by the pound!

The 1\4x20 bolts will carry way in excess of 1200lbs before sheering. Again, looking for the sheer strength online produced very dubious looking figures. My usual go-to source of The Handbook of Chemistry and Physics didn't have anything bar a definition of sheer strength. Perhaps my engineering handbook would but at the moment it cannot be located.

The 4mm bolt did the biz. This screws into my electro magnet nicely. The bolt is a shade too long but I can always space it off with washers or even trim the bolt a shade with my angle grinder. All I need is to bolt one to a steel bracket and the other to the underside of the latch and the bracket to the bulkhead beneath the latch and its a very simple electro unlocking mechanism. They always say to keep it simple!

If the dual electro magnet affair works as hoped then it would be possible to add remote unlocking. Remote locking could be more challenging, however.

Thinking about a pull on the front door to close it, I realised that as I have a penchant for large size keyrings, I could put a small hook on the outside of the door and use my keyring to pull it shut. Thus I would also be more certain of not locking my keys in the bus!