Dishing Stump

[Gobae]

For a long time I've been telling myself that I'd get around to making a dishing stump for making Celtic Bronze and Iron Age cauldrons.

Having a friend with a lot of acreage getting the stumps were no problem. My bigger issue was how to go about hollowing out the depression. Certainly, I could start working a vessel hot and just let it burn out as I worked. But given the size of the cauldron I planned to make that could take a while. Finally, a friend pointed me to these:



They are a tungsten-carbide burr designed specifically for grinding out wood.

I bought the coarsest available and it really hogs out the wood. In 20 minutes I dug out a 9" dia bowl form in white oak end grain. It rarely clogs (green or punky wood were the only things I've found that clog it) and when it does it's easily cleaned with a wire brush.

The only downsides are that I had to remove the guard from my right-angle grinder because these discs are thicker than the typical wheel. (I plan to modify the guard so it fits again). The second is the amount of "saw" dust. with that coarse a burr I had anticipated shavings or chips, but it gives off a ton of dust. So, good ventilation is a must.

So if you need to shape big dishing stumps these burrs work fantastic!

[Dale Russell]

Gobae , take a look at these , made to fit that 4" grinder you " took " the safety guard off .

Pro-4 Woodcarver

These things chew out wood just like a chainsaw , will do all you want & more

Dale Russell

[Gobae]

Yes, I looked into those. But, after asking around the Woodnet forum I was told that they weren't particularly great on end grain or doing sloping curves.

I should expound a bit about the guard issue. Those burrs ARE designed specifically for a 4" right angle grinder. After taking a closer look at the issue it appears that at some point I dropped the grinder and bent the guard just enough that the burr rubbed on it.

After some simple straightening it's up and running just the way it's supposed to.

[solvarr]

Did you use the rounded or the flatter profile?

[Gobae]

I used profile "A", the rounder one.

[agsolder]

Who makes these? Thanks.

[Gobae]

These are made by Kutzall and I got this one from Woodcraft.

There's another company called Saburr-Tooth that makes a remarkably similar product. Unfortunately, their (Saburr-Tooth) website has no prices so I didn't investigate further.

[Johannes]

I'd just use a hollowe gutz, chizzel and hammer, and allot of elbow greace;-)

[GVR-4579]

I used a chainsaw once to do some large scale woodwork, i also have a special disk for the 4" angle grinder that has a chainsaw blade around it for doing that kind of stuff as well. Sounds like you have something that works good as well.

[NeatGuy]

I have used a router on a pendulem mount to make a very large radius bowl form . Move the router back and forth over the work and it will inscribe an arc. Shortening up on the pendulem arm would make a smaller radius arc.