Speed Information, Maintenance Recommendations, Reference Speed In Accordance With Din 6386; Influencing Factors That Significantly Impact The Tensioning Force - Optimum optiturn TH 3610 Betriebsanleitung

4.13.3 Speed information, maintenance recommendations, reference speed in accordance
with DIN 6386
The reference speed is the number of rotations, at which the mathematical centrifugal force
with the corresponding jaw design correlates with the greatest tensioning force when the
machine is at a standstill. The reference speed applies for jaws mounted inside in tiers,
whereby they must not protrude past the outer diameter of the chuck.
At the determined reference speed, 1/3 of the tensioning force which is available when the
machine is at a standstill, is available for clamping the workpiece. The prerequisite is that the
clamping chuck is in proper working order.
In general, the labels on the clamping jaws and lathe chuck (perm. speed, max. turning diame-
ter, ...), the information in the respective lathe chuck operating instructions and, for special
jaws, the additional information on the respective drawing must be observed.

4.13.4 Influencing factors that significantly impact the tensioning force

Clamping jaw centrifugal force
To calculate the required tensioning force for processing a workpiece, the centrifugal force of
the clamping jaws must be taken into account.
The permissible speeds can be determined in accordance with VDI Guideline 3106 "Determin-
ing the permissible speed for lathe chucks (jaw chucks). This guideline also allows for the resid-
ual tensioning force at a specified speed to be determined.
Base tensioning force
Required minimum tensioning force
Version 1.0.5 - 2021-03-23
Fc
m
rs
n
r
0
Speed
Translation of original instruction
Centrifugal force in N
Mass in kg/set
Centre of gravity distance to the centre of the chuck in
metres
-1
Speed min
Centre of gravity distance to the clamping jaw
Workpiece is
released uncontrollably
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