15PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
Figure 3-16 Shop-made vise key
Dimensions in millimeters
Figure 3-15 Keys installed on X-axis of vise
On most vises the keys can also be installed on the long axis
VISE KEYS
Most precision vises come with key slots on the un-
derside machined exactly parallel to the xed jaw. Key
slots, Figure 3-15, can be a great time saver. Properly
installed they allow the vise to be removed and replaced
routinely, accurately enough for general machining with-
out the need for indicating every time.
Most 4” vises have either 14 mm or 16 mm slots, calling
for shop-made T-shape adapter keys as Figure 3-16. It
is well worth the eort to make these precisely.
Aim for a snug t in both vise and table, but not so tight
that it takes more than reasonable eort to lift the vise
clear. The objective is allow the vise to be removed and
replaced routinely, accurately enough for general ma-
chining without the need for indicating every time.
Case hardening of the keys is recommended, with nal
tting using a ne stone or diamond stone.
There is no “right” setup for a vise, but as a starting point
aim for an indicator dierence of no more than ± 0.001”
over the width of the jaw.
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