Last weekend, I was hollowing a big deep bowl from a cherry log. After the adze work, I reached for a tool I use from time to time to fine tune the form of a large hollow. I’ve seen tools like this called inshaves or scorps, so take your pick. I’ll call it an inshave here.
You can find dozens of different inshaves available with a quick search. Chairmakers would know more about them than me. I’m only familiar with this one, which I like for bowls because it comes back together more at the top than most, which keeps the hands in tight which is more important in a deep bowl than with a chair seat.
The handles also sweep back enough to stay clear of the bowl. There are scorps with a single handle, but I think the double provides more control.
I purchased this one nearly 20 years ago from Massachusetts blacksmith Ray Larsen who had a business called Genuine Forgery. He wrote at least one article in Fine Woodworking magazine back in 1977, and he also wrote the book Tool Making for Woodworkers. It’s a very practical book for anyone who wants to make or adjust some of their own tools. I’ve referred to it many times over the years. I found an interesting article about Ray and some of his later artistic toolmaking explorations.
Of course, like all of these edge tools, it doesn’t work well if I don’t keep it really sharp. Even after all these years, I’m still amazed at how the performance of a tool is transformed after even a touch-up. I’m getting better at reminding myself of that more often.
Another way to fair the interior is with a modified travisher. I wrote a post about this one a couple years ago.
Neither of these tools is a necessity for carving bowls, but they’re nice options for certain circumstances.
I’ve hewn the outside of the bowl now, and, after it dries, I’ll put the final surface on the hollow by paring with a sharp gouge.