Carbide burrs

[Robert Zambelli]

Any idea who sells these?
I’m looking for the type that are spherical, around 7/16 diameter, kind of a copper color, 1/8 inch shaft.
Possibly made by Robart?

Thanks for any help, Bob Z.

[Dave Hull]

Bob,

As you probably have already discovered, that is a very large head size for an 1/8" shank. Generally what you can get in carbide is a 1/4" ball on an 1/8" shank. McMaster has a good selection. And when they don't have it, it is pretty specialized....  They do have a 3/8" ball in HSS on an 1/8" shank.

The "copper color" might be a TiN coating?

Maybe Robart commissioned them for balsa and wood applications?

Good hunting,

Dave

[Joe Bowman]

Bob,  This is where I have purchased different size and shape burrs in the past.  https://www.saburrtooth.com/  The copper colored one you referenced, I think I got mine from Dremel. Hope this helps

[Robert Zambelli]

THANKS, Dave and Joe.
I'll try that info.

For what it's worth, here is the burr I bought over 25 years ago. Designed for cutting wood, it still works quite well but I want some spares.

Bob Z.

[Lauri Malila]

THANKS, Dave and Joe.
I'll try that info.

For what it's worth, here is the burr I bought over 25 years ago. Designed for cutting wood, it still works quite well but I wand some spares.

Bob Z.

That's a Perma-Grit, isn't it? www.permagrit.com
Check the "Rotaries".
L

[Dan McEntee]

  Yes, I have been trying to think of PermaGrit all day and just did before logging on here. Not cheap but great tools and will last as long as you will provided you  don't lose them!
   https://www.permagrit.com/small-rotary-tools/

   Type at you later,
  Dan McEntee

[Rick Campbell]

THANKS, Dave and Joe.
I'll try that info.

For what it's worth, here is the burr I bought over 25 years ago. Designed for cutting wood, it still works quite well but I wand some spares.

Bob Z.

These:

https://robart.com/collections/hobby-tools-carbide-cutters

[Steve Helmick]

When using carbide...avoid letting the cutter grab, bounce and chatter, lest the shaft break off, sending bits flying. Wear safety glasses!  Steve

[Robert Zambelli]

Great advice, Steve - I appreciate it.

I always wear safety glasses when using any type of cutting tools.

I've not had a shaft break but I did have one bend - the thing shook like a sinner in church!

I made a very effective downdraft sanding table (Mega bench) and it does a very good job of pulling dust out of the air and capturing it in a filter. Also works for spray painting.

Bob Z.

[Motorman]

I find the permagrit burrs load up too easily if you have to go through epoxy joints or painted surfaces. I like the round wood rasp type burr.

Motorman

[Robert Zambelli]

You are correct - they do tend to load up when cutting certain materials.

BUT, I put them in boiling water for five or ten minutes and they clean up nicely. If they load up with certain plastics or adhesives, soaking overnight in lacquer thinner or acetone seems to work well. 

Bob Z.

[Kim Doherty]

 Bob

Have a look at these. Very easy to control. Good product.

https://www.leevalley.com/en-ca/shop/tools/power-tool-accessories/burrs/114748-set-of-4-kutzall-rotary-carving-burrs?item=99W6211

Kim

[Steve Helmick]

Great advice, Steve - I appreciate it.

I always wear safety glasses when using any type of cutting tools.

I've not had a shaft break but I did have one bend - the thing shook like a sinner in church!

I made a very effective downdraft sanding table (Mega bench) and it does a very good job of pulling dust out of the air and capturing it in a filter. Also works for spray painting.

Bob Z.

If the shaft bent, the shaft itself wasn't carbide! Likely was just mild steel with the carbide part brazed on. I snapped a 100% carbide burr in a die grinder...it was mine, it wasn't inexpensive, and broke within about 2 seconds, leading me to prefer a good sharp file wherever possible.  Steve 

[Robert Zambelli]

Thanks for the great advice, Gents.

I did end up buying the Kutzall Extreme. Haven't used it yet but it looks like one serious cutter.

Bob Z.