The Dremel Stylus rotary tool is a lithium-ion battery powered no-cord, ergonomic revision of the standard Dremel tool which most of us are familiar with, and probably use a good deal.  I have to say, it is the most useful little tool that I’ve come across in quite a while.  It is perfect for tasks like undercutting tone holes, smoothing rough edges, and deburring in general. It just is comfortable for use in a way that the standard corded Dremel tool is not, and I find I use it a lot more than the corded model. Due to it’s ergonomic design, I feel I have much better control over the cutter as well. And there is no cord to get in the way. Battery life is excellent, I’ve been using it moderately over two weeks and have yet to recharge it. 

It has two downsides that I am aware of:

1. It has much less torque that the corded model. That’s OK for the types of jobs that I describe above, but don’t expect it get much satisfaction using carbide cutters on harder metals or stone. It will not work well for that.

2. The battery is not replaceable as far as I can tell. Once the lithium-ion battery wears out, you toss the tool– too bad. I imagine the life of a lithium-ion battery is a few years, based on a small Bosch drill that I have.

In my C Penny chanter project, I used this tool to debur the brass tubing after cutting with a bandsaw, to remove  brass burrs after drilling operations, and to undercut the C hole on the chanter which was playing a little flat. It should work really well on hardwood, given the right cutter or sander.