including a number of cups which require attention only every three or four BY A. FREDERICK COLLINS, grinding outfits for both external and internal work, months. The outfit includes a chuck of standard de- radial and hand drills. The electrical tool-post grinder which we illustrate covers a wide… … designed. The bench drill shown herewith a screw clamp so that different sized shanks is furnished with a vertical motor mounted can be used. The extension mandrel C is Electrical Tool-Post Grinder. The weight of the bench drill complete is about 40 pounds, enough to insure firmness and rigidity.…
Internet Archive · Public domain (published before 1931). Free to use for anything.
