I measure and center punch a sharp dint. I then measure again. Most of the time I will be slightly off center. I take a hand drill with an 1/8" drill bit and angle the drill and walk the dint back on center. I then hold the drill straight and drill with the 1/8" drill. I check with a small square or a square block as I drill using a different 1/8" drill bit for the check before I am in real deep. With a 5/8" bolt I would then drill a 1/4" hole in the straight 1/8" hole followed with the tap drill for 5/8. Sometimes after the tap drill size is drilled thru I can pick out the threads with a small sharp pick. Most of the time I chip out the threads with the tap. I make sure I back the tap up after a 1/4 turn to make sure the threads are broken off in chips. This propbly takes less time than typing how to do it. The secret is to drill a small pilot hole straight and on center. also find center on flat enough surface that you can measure and walk or draw the center punch to the center.
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Today's Featured Article - Tractor Operator Safety - Loader & Backhoe Operation - by Staff. Loader Operation Do not transport anyone in the loader bucket. Always carry the loader bucket low for maximum stability and visibility, whether the bucket is loaded or empty. Always use the recommended amount of counterweihting to ensure good stability. Be careful when handling large objects such as round bales, logs,
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