To Tap a Hole by Hand.pdf - Manufacturing Theory I MFG8511...

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Manufacturing Theory I MFG8511 To Tap a Hole by Hand: Before tapping the following should be determined: 1. The proper tap hole has been drilled follow your T.D.S Chart 2. The tap has the correct specifications. Example:
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3. The tap hole is clean and free of all chips (particularly for blind holes). Do not forget to CHAMFER the beginning of the hole FIRST! This will give you a good leading edge for the thread to start and NO sharp edges! 4. A suitable cutting fluid has been selected for application during the tapping process. Taper - Tapered Approx. 6 Threads Plug - Tapered Approx. 3 Threads Bottoming - Chamfered @ End - One Thread Only 82° Standard Countersink Tool
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VIDEO Cutting Fluids - Click Hand tapping should be performed by having both hands on the handle and equal pressure applied to rotate the handle. The tap will then tread itself into the hole. To break the chip and to avoid loading the tap with material, the tap should be backed off about a half a turn for each complete thread formed. On completion the tap is
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