MACHINE SET-UP
1001 DFB
Drilling & Sawing Line
4.3.10 Automatic adjustment of the spindle advance speed
Three spindle speeds are normally selected during a drilling cycle:
On special applications and especially when jogging or intermittent advance is involved,
the spindle speeds may have different characteristics.
Change from one speed to another is determined, during a normal cycle, by the electronic
adaptive device.
The above device enables to automatically change from rapid advance to drilling speed
(feed-rate) as the drill contacts the material and then change to rapid return as the drill has
completed the hole drilling operation.
With this electronic adaptive device the limit switches and therefore their adjustment are
no longer required.
The preset rapid advance and return do not normally require any adjustment by the
operator.
The feed rate can be adjusted by CNC.
In structural steel applications, we may consider a feed rate varying from 30 mm/min. to
120 mm/min., depending upon the spindle R.P.M., the tool type and the lube/cooling
system available on the machine.
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