10 - Heavy Duty Lathe Stand, страница 25TECHNIQUE FIRST: WRAP MASKING TAPE AROUND CIRCLE AND SPLICE ENDS TOGETHER SECOND: REMOVE TAPE AND MEASURE TO FIND Measuring Round ObjectsPLACE WORKPIECE BETWEEN LEG OF FRAMING SQUARE AND TRY SQUARE TO FIND DIAMETER A penny is exactly 3/4."It's handy for quick measuring or laying out a 3/s" radius on a corner. CIRCUMFERENCE How do you cut a piece of veneer tape 01- T-molding to fit around a round workpiece? A tape measure isn't flexible enough for small Mk objects. And it's awkward to hold ^^ one around a large object. The best way I've found to do this is to use masking tape. I just wrap it around the edge and splice it for an exact fit, see Drawing. Then to determine the circumference, just peel off the tape and measure it with a tape measure or rule, see Detail. DIAMETERS Measuring the diameter of a round object can be difficult. If the object is small, you can make a simple caliper with a rale and a pair of square blocks, see Drawing. To find the diameter of the object, place it against the rale and butt the blocks up against the part. Then simply read the diameter on the rule. If the object is large, you can use the same idea. But instead of a rule and blocks, use a framing square and a try square, see Drawing. PLACE WORKPIECE AGAINST RULE AND BUTT BLOCKS UP AGAINST PART THEN READ THE DIAMETER ON THE RULE Drafting Tools for Layout There are a number of drafting tools that I keep on hand in the shop to make working with circles and curves a lot easier. Circle templates, flexible curves, and French curves can be found at your local art store. (For alternate sources, see page 31.) A circle template is handy for finding the center on small objects or for laying out a radius, see photo. Flexible curves and French curves make quick work of transferring and laying out curves, see photo. Templates: A circle template is a quick way to accurately lay out a radius or circle, or to find the center of a circle. Curves: Flexible curves and French curves are handy for laying out or transferring graceful curves on a workpiece. No. 10 ShopNotes 25 |