Taps (by Size)

Taps (by Size)

A tap creates an internal thread

Using taps:

Firstly, drill a hole 0.1mm* smaller than the desired thread size. For instance if the hole size is 1mm use a 1.10mm tap. Always use one or two tenths of a greater size so the tap incises the hole. This will give an efficient cutting thread to the hole ready to be screwed.

The work piece must be securely supported. When starting the cutting, the tap must be help perpendicularly. Clockwise, turn the tap into the hole, one rotation at a time, to ensure no debris from the process falls into the hole. Use air cleaner or a rubber blower to clean the hole before, during and after tapping. Tapping too fast can shatter the tap. Additionally debris left in the hole causes clogging and the thread may distort, hence breakage. Excessive force will result break the tap. Cut lube or Bees Wax should be used.

*Sizes vary on the type of metal being tapped, 0.10mm difference will suffice on softer metals such as 22ct or pure gold, however 0.20mm maybe required for harder metals such as silver or 9ct.

*PLEASE NOTE: NEVER turn a tap in a die, doing this will damage the threads on both tools, use a measuring gauge (G9737) to determine the size of the tap needed.

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