Join Date: Jan 2008
Location: Seattle, WA area
Re: Electric die grinder
The RotoZip is certainly capable in RPMs, but I would suggest you experiment to see if you can hold it in a braced position. I use various grinders, but for most of the heavy work, I use an electric die grinder that is about 14" long. This is important to bracing it to both reduce fatigue, but also have much better control of the cutting. The technique I was taught is to fix the head at the correct height and angle to allow bracing of the grinder with two hands firmly against the hip. The position is much like you would hold a heavy machine gun for hip-shooting.
To grind accurately and smoothly, the hands do not move the grinder - your body does, swiveling at the hips like a turret. You can take amazing amounts of metal out in one pass so accurately, that in just a few passes (while changing the head fixture angle), a finishing roll is all you need to blend the flat cuts into the final form. In-fact, you have to be careful to avoid cutting too much on any one pass, as it's easy to take 1/8 to 3/16" in a single pass, which may be too much when cutting successive angles on a radius. Remember, you don't use a carbide cutter to 'work' the metal like a sanding drum - you cut with it.
Experiment making braced cuts all over a junk head. It doesn't take long to find the 'feel' moving against the cut like scooping ice cream. HTH
-=≡ If it was easy everyone would do it ≡=-
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