I can’t seem to find any examples of people working with these (reviews/tutorials). In photos they look just like a cup bur, but I’m looking for a quick and easy way to make little spikes out of a wire end (10-14ga) or a soldered-on ball for edgy/rock n’ roll designs. I primarily work in sterling, but sometimes fine silver and brass/bronze as well. Can anyone with first hand experience describe the finished shape these leave and if they’re what I’m looking for? Specifically, I am considering the Busch® Tungsten Vanadium Twincut Concave Cone Bur at Rio and I’d like to keep my costs as low as possible as I am an amateur doing experiments.
I live close to this tool supplier. 've gotten the tool in this link from them n as large as 1 gauge. Contact them and see i you can get the size you want. No need to buy expensive burs, and no electricity needed. They work perfectly. I use them when I do ear ring wires.
But what shape does it leave? It looks like the standard cup bur, which is not what I’m looking for. As I said in my post, I want to make spikes, not just round off an end.
Could you just put your lengths of wire in a flex shaft or drill and grind (spin the wire against a flat surface) on sandpaper at an angle?
I don’t think I’ve seen a bur that leaves a sharp tip and I can’t imagine many use cases justifying their production. But if you just want to make a bunch of tapered spiked wires this is what I would do. Saves you from having to file each individual wire by hand and probably makes quick work of shaping and polishing your tapered spiked.
I have a PUK and use it to create a smooth rounded end to earring wires and post. It won’t create a ball much larger than the end of the wire. I also regularly solder what I call a 3/4 ball to the end of 12 gauge wire to create a hook that is part of my hook bracelets. I just melt an amount of jump rings that will create the ball. Keep a record of the size of jump rings used so that you can repeat the process. I then put the ball onto a dapping die block and either with a hammer or my 20 ton press, force the ball into a die hole slightly smaller than the ball. This does two things: it makes the ball round and it closes up any imperfections in the surface. Finally, if I wanted to sharpen the end of a piece of wire, depending on the length, I would make sure that it is straight, chuck it into an electric drill and run it against a 600 grit sanding disc making sure that they both run in opposite directions. If the wire is too long to use the drill, use a pin vise and turn the end against the sanding wheel by hand. This may or may not help answer your question…Rob
These are just regular cup burs that do the opposite of what you are looking for- they round off sharp edges.
Hi,
concave cone burs result in a slightly different shape than cup burs…
cup burs result in a low, rounded dome
rounded side profile
cone burs result in a low, rounded cone, which does have a sort of a point, but i would not call it a sharp spike, because its profile is shallow…
flatter side profile
julie
Yeah, I think I’ll just do that and save the scrap dots for something else like impression die stuff or ingots