1 - 7 of 403 Posts

#### MattsAwesomeStuff

Joined
·
1,797 Posts
At that scale (I mean, technically at any scale) the "fuse" is just a chunk of wire.

You can (mechnically) measure it's dimensions and material, and just create a new one.

For racing, I would throw in something in the right ballpark and keep the factory one for normal driving.

The fuse is only there to protect your wiring from lighting on fire, so, "fusible links" are usually just 30-50% thinner than the main wiring, ensuring that it will melt at a level below where the main wiring melts.

I'd say start off with a chunk of thin wire, accelerate... and keep an eye on where you blow it up. Then use two wires, or heavier wire, then accelerate again. If you're watching the amps, you'll pretty easily mathematically determine the rough cross section you need. I.E. If a piece of 14g wire liquifies at 50 amps, and you want it to liquify at 350 amps, you'll need 7 of them, or one with the cross-section of 7 of them.

Keep it horizontal, DC will arc through a broken wire if vertical.

If you want to get fancy, take wire cutters and give it a pinch at either end. That gives a weak point for it to break. If it doesn't break at one end, and continues to arc, the opposite end will become the next weak point and it'll cut there and drop the whole wire out.

#### MattsAwesomeStuff

Joined
·
1,797 Posts
I'd rather an encased fuse was used so if a piece of fusewire detatches it can't short anything else.

Oh la tee da Mr. Moneybags over here, too good to use household garbage as safety devices.

Duncan, this should get you started:

#### MattsAwesomeStuff

Joined
·
1,797 Posts
What are the chances that you are seeing a reflection of the safety cone in the nice shiny brake disk? It seems a bit of a stretch, but maybe..?
[Edited to add - Damnit, galderdi beat me to the same observations by 30 seconds while I was typing]

At first I laughed it off, as of course that's not happening... but...

1 - Why is the outside of the black rim orange/red? That's not reflected light from inside the wheel well.

2 - Why is the rightmost edge of the discbrake not orange, but grey?

3 - Why is the top of the disc brake only slightly warm, but the bottom glowing bright?

...

Was there bychance also an orange sandfence or safety fence nearby?

Alternatively, cameras pick up infrared much easier than our eyes do. Something that appears to emit zero heat light yet, will often show up as pink/purple/orange on a camera that has weak infrared filtering (nearly all cameras, if you point a TV remote at your camera in video mode, and hit some buttons, note that it lights up white hot on your camera screen).

#### MattsAwesomeStuff

Joined
·
1,797 Posts
Oh and I just noticed the top of the disc (through the gap in the wheel) is also not glowing.
Hah! I beat you to that one.

Regardless, we're 3/3 on the same observations.

#### MattsAwesomeStuff

Joined
·
1,797 Posts
Suggestions about where to get one?
Bigger forklift?

Two in series handle double the voltage. Two in parallel handle double the current.

Start stacking them like Voltron.

#### MattsAwesomeStuff

Joined
·
1,797 Posts
What about using two of these?
You can get 2587 boosters for a lot less than that. They should be around a bucks a piece, shipping included IIRC last time I ordered some. Ebay. Usually sold in 10-packs. Solder your own wires onto the board instead of using screw terminals if you want to save a few bucks. Cheap as chips but order extras because they take forever to get there and naturally you'll blow some up.

Handy little things.

I think they often claim they're good for 3 amps, but, in testing I seem to recall the solder melted and stuff started floating away north of 1.5-2amps.

For maintaining 0.4 amps, they'll be fine. Shouldn't even run warm.

#### MattsAwesomeStuff

Joined
·
1,797 Posts
Cheapskates use stainless - or possibly aluminium
I have a mentor who, whatever he suggests, I start thinking about a halfassed step down from it as sufficient.

He suggests welding? Bah, JBWeld should hold.
He suggests JBWeld? Ehn, duct tape or superglue.
He suggests steel? Aluminum.
He suggests aluminum? Chunk of wood.
He suggests wood? Cardboard.

I'm usually wrong but only after a while. Always worth a chuckle, and most of what I build is just goofing off for a laugh around the shop anyway.

1 - 7 of 403 Posts