How to fit a round thing (sprocket / pulley) in the middle of another thing ?

[beesonthewhatnow]

What is all that crap on your bars?

 

[Sprocket.]

I've already identified the key weakness in the central pillar under the bottom bracket and torsion in the central beam .. since I have the tools and materials I'm going to skin it all with 6mm MDF and add some noggins - but what it really wants is some steel ...

You need to use dowels and glue on your joints. But I would use screws through plates across the joints too or it will shake to pieces.
I have, successfully drilled and tapped MDF with metric threads before and they proved quite robust and long lasting.
Though nothing beats a welded steel frame.
I would recommend a small inverter welder about 140Amp for all your home workshop jobs. Big enough to manage quite decent thickness welds, but also very portable and weigh about 6 kilos.

 

[gentlegreen]

What is all that crap on your bars?

That was an earlier incarnation of my bike lights.
This was the most recent version.

Unless something goes very awry, I won't be voluntarily cycling at night again, so no need for much of it - except the Philips ...

 

[Saul Goodman]

 

[gentlegreen]

It only weighed about 3KG

 

[Saul Goodman]

It only weighed about 3KG

I've got motorbike wiring looms with fewer wires than that

 

[gentlegreen]

I've got motorbike wiring looms with fewer wires than that

The thing is it was a perpetual prototype - rehashed most years - at least come the end I used proper Wago connectors and not gaffertape.

 

[beesonthewhatnow]

That was an earlier incarnation of my bike lights.
This was the most recent version.

Unless something goes very awry, I won't be voluntarily cycling at night again, so no need for much of it - except the Philips ...

View attachment 206552

Just... why?

 

[Saul Goodman]

The thing is it was a perpetual prototype - rehashed most years - at least come the end I used proper Wago connectors and not gaffertape.

When they said you were Alpha Male, I didn't realise it was because your prototypes never reach Beta stage

 

[gentlegreen]

Just... why?

I wanted optimal lighting - all modes covered - and so roughly the antithesis of commercially available lighting.
99 percent of my cycling has been on the same 10 miles of roads and paths.
Weight has never been an issue - heavy rider, heavy bike, short distances - but I've often done 20, 50, up to 70-odd miles in a day...

Edit :-

well there are a few modes missing - like riding the North circular or the hard shoulder of the A38 ... or the Yorkshire moors ...

 

[beesonthewhatnow]

I have on the front of my bike a light the can output up to 1300 lumens. I never use it on that setting because its too bright and silly. It weighs less than 200 grams.

You're mental

 

[platinumsage]

I have on the front of my bike a light the can output up to 1300 lumens. I never use it on that setting because its too bright and silly. It weighs less than 200 grams.

You're mental

Is that full beam or dipped beam?

 

[beesonthewhatnow]

Is that full beam or dipped beam?

That's "pointed down at the ground where I need to see so it doesn't kill the eyes on any cars coming my way" beam

 

[gentlegreen]

I have on the front of my bike a light the can output up to 1300 lumens. I never use it on that setting because its too bright and silly. It weighs less than 200 grams.

You're mental

I have no idea how many lumens my lights are.
My reference is the Philips Saferide 80 - which is probably the best road light ever made - but I find it too intense for shared paths. so I made a 2.5 watt diffused lantern.
I also like a bit of fill-in for unlit main roads and a bit more "be seen" - so I kept my old 6 watt dipped beam and angled it upwards.
The 32 watt lamp was for going through the woods and for when I needed to be noticed.

 

[beesonthewhatnow]

Honestly, you could literally do everything that 3kg lump can do with something a sparrow can pickup nowadays

Modern bike lights are amazing bits of kit. The best bike lights ever made are the ones you can get now. The tech has come on so much.

 

[gentlegreen]

Honestly, you could literally do everything that 3kg lump can do with something a sparrow can pickup nowadays

Modern bike lights are amazing bits of kit. The best bike lights ever made are the ones you can get now. The tech has come on so much.

Not based on 20 years of observation - either the hardware is faulty or it's a wetware or attitude problem.
As I said, I actually have available the best road light ever made - OK the EDELUX and B&M are similar.. but hardly anyone fits them on my commutes.

 

[beesonthewhatnow]

It really isn't. It's what, a 6 or 7 years old design? Battery and LED tech has come on since then...

 

[teuchter]

When the world's supply chains finally collapse then gentlegreen will have the means to make his own bike lights while other cyclists will be furiously searching for a dwindling supply of ultralight batteries on amazon.

 

[gentlegreen]

It really isn't. It's what, a 6 or 7 years old design? Battery and LED tech has come on since then...

The STVZO regs are unchanged.

 

[gentlegreen]

First snagette du jour ....
Derailleur tensioners are designed to work the other way around so I couldn't locate it where I wanted - luckily it's still plenty far enough away from my clown toes ...

Snagette 2 I can get 5 volts out of it fairly easily - have yet to see how much actual power, but I suspect very little because it's far too easy to pedal, and shorting the motor makes no appreciable difference.

That 48 tooth chainwheel looks ginormous for some reason, but it's way too small to get the motor spinning appropriately fast ...

So I'm going to have to construct a Joule-ian energy-sucker of some description and I don't have a suitable sock-washing drum to use

Stability-wise it's quite reasonable - and I could easily attach one or more bits of 2x2 to wall brackets...

 

[Saul Goodman]

I think you're going to need a few multipliers to get that spinning anywhere near fast enough. What are the specs of the motor? Does it show the no-load RPM?

 

[gentlegreen]

I think you're going to need a few multipliers to get that spinning anywhere near fast enough. What are the specs of the motor? Does it show the no-load RPM?

it says 800RPM on the label ...

 

[gentlegreen]

I stuck my antique moving iron ammeter on it and clocked up to 4 amps - but at 0.8 volts - no wonder it's so easy to spin

 

[Saul Goodman]

it says 800RPM on the label ...

View attachment 206706

Losses aside, and assuming 100% efficiency, you'd need to be pedaling at 466 RPM to achieve that 24V 8.8A output figure. Add about 20% for losses, and you're looking at 560 RPM at the pedals. You might want to stock up on Weetabix

 

[gentlegreen]

Darn.
I wonder what I could turn it into
I'll mark it up to the effects of solitary confinement.
I'm probably going out for a proper ride tomorrow and may accidentally forget the time and where I live.
I have about 4 weeks' exercise ration saved up.
I will be avoiding Pill though ...

The only thing I know about Pill is that navy ships heading up the channel to Bristol had to offload / reload their gunpowder at a building opposite the harbour.

 

[Saul Goodman]

Darn.
I wonder what I could turn it into

Assuming your measurements above were correct, you managed to convert all of that pedalling into 3.2W of power. You could use that to run a 12 inch LED strip, which you could attach to the down tube of the frame, so you can keep an eye on your shins if you're pedalling in the dark

 

[gentlegreen]

Assuming your measurements above were correct, you managed to convert all of that pedalling into 3.2W of power. You could use that to run a 12 inch LED strip, which you could attach to the down tube of the frame, so you can keep an eye on your shins if you're pedalling in the dark

I do as it happens have some battery Xmas lights I modded for USB ...


The point was to get some exercise - since I'm not in the mood for dancing in my private disco once I've cleared enough floor.
I somehow need to build-in 100 watts of friction...

This is what Joule used - so a small drum with an agitator and my socks would be ideal ...

 

[Saul Goodman]

If you raise the front of that frame off the floor by a couple of feet, you'd effectively be pedalling uphill = greater resistance.

 

[Saul Goodman]

Joking aside, you could replace the sprocket on the motor with something like a rubber wheel, then refit the bike's rear wheel and use friction from the tyre to turn the motor.

 

[gentlegreen]

I suppose that would work ... I will have to see if there's enough friction without putting a tyre on the motor ...

Luckily there's enough room ...

I suppose at some point I should look at how they usually do this sort of thing ...