Precision matthews PM-1440GS, Руководство пользователя

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Copyright © 2020 Quality Machine Tools, LLC PM-1440GS v3 2020-10
Figure 3-24 Follower rest (representative)
SPIDER
A spider is installed on the left hand end of the spindle. Its
function is to stabilize long workpieces that would otherwise
wobble. To set up the spider, back out its four clamp screws,
then chuck the workpiece using moderate jaw pressure. The
aim is now to match runout at the spider end with runout at
the chuck end (usually adjusted for zero unless a deliberate
offset is called for). Progressively tighten the spider clamp
screws to grip the workpiece firmly, without deflecting it.
Re-check runout at the chuck end, correcting one or more of
the spider screws if necessary. Fully tighten the chuck. Some
amount of iteration may be necessary to achieve similar run-
out at both ends. When satisfied with the setup,
fully tighten
the locknuts on the spider screws, then re-check.
Figure 3-25
Spider attachment