Review on 🔧 Adjustable 4-Inch Circle General Tools by Matt Chirila

General's quality control in manufacturing this item for them in China has resulted in the tool being dangerous to use no matter how much care you put into it. The x, y, and z axes of the cutting hole to be pierced do not have a normal relationship to the major axes of the General Tools 4 circular cutting tool body. The result is a geometry that causes the trailing edge of the cutting edge to have insufficient clearance. I bought a #4 circle cutter to make wood plugs that are 3/8" thick and 1-1/8" in diameter, which is smaller than the minimum #5 diameter I use regularly for this purpose. Insufficient clearance angle, caused by insufficient broaching, was immediately noticeable through the smoothing of the vertical cut surfaces. With each attempt to go full depth, the trailing edge resistance increased until it jammed at a depth of 5/16 inch. Machining setup photos are included to verify proper speed, down feed control and part security. Also note that the machine table was locked and the maximum extension of the quill was 1-1/2 inches. If I hadn't exercised this caution for safety reasons, I might have blamed myself for the tool's performance. This is a defective and dangerous item manufactured with inadequate quality control and should be removed from stock immediately.