19 Aug. 1984|
Large wood circle cutter,yard swing frame plans free,heavy duty workbench plans pdf - Plans Download
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Here is a video demonstrating Del Short's earlier wooden mechanical device, made back in 1982. In contrast to how twist and step drill bits operate, hole saws work by cutting out the edges of an opening. You can then use a compass or circle template to outline the edges of the hole, but this is optional.Once the hole centers are marked with ink or scribed crosshairs, use a center punch to strike each location.
You start off by drilling a small diameter pilot hole, and then drill gradually larger holes until you get to the size you need. These single-flute bits are specially designed for thin materials, and feature steps of progressively larger diameters.Self-starting step bits do not require any pilot holes to be drilled, and can create large burr-free holes in the blink of eye.
For larger holes or use on thicker gauges of steel, more robust and costlier bench-mounted punches may be required.To use a portable hand punch, first select and install a matching punch and die set. This method works for small-diameter holes but it can be tedious and time-consuming when the project calls for numerous holes, large holes or numerous large holes.Advertisement - Continue Reading BelowCutting fluids can be used with twist drills, but are generally not needed for thinner gauge sheet metal.
When using larger saws on tougher material (such as steel), cutting fluid can help make the job go easier and prolong the saw's life. If the sheet is to be clamped to a sacrificial wooden board for the same reason, masking is not necessary.