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TAPPING AND THREADING Standard machine shop tools and procedures may
be used for tapping and threading. Wherever possible, the
"national coarse thread" system should be applied. On
diameters over 1", Acme threads are preferred to Vthreads.
The root should be radiused. When transparency is a requirement for the
tapped threads, a wax stick should be inserted in the drilled
holes before tapping. As in drilling, the wax lubricates the cuts
and supports and expels the chips resulting in cleaner, more
transparent threads. Taps should be backed out often to
clear the chips. The wax stick is particularly useful for blind
holes since it tends to clean out the chips as they are formed. |
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Copyright © Plastiglas de Mexico 1999
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