68
96-8000 Rev AC
May 2010
to zero.
P
allet
c
hanGer
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erieS
and
Mdc-500)
Introduction
The pallet changer is commanded through a CNC program. The M50 (execute
pallet change) function consists of unlocking, lifting and rotating the pallets,
then lowering and locking the pallets again. The pallet changer rotates the pal
-
lets 180o, then back; it does not continuously rotate in the same direction.
The pallet changer is provided with an audible signaling device to alert nearby
personnel when a pallet change is taking place. However, do not depend on
the signal to avoid mishaps.
Pallet Changer Warnings and Cautions
• Large workpieces may collide into frame during a pallet change.
• Verify tool length clearance during pallet changes. Long tools may collide
with workpiece.
.
Plane3
Items Beyond the Maximum
Radius and Height Limits
Will Damage the Machine
When the Pallet Rotates
EC-300 Shown
Maximum Pallet Loads
EC-300
550lb (249kg) per station, balanced within 20%
MDC 700lb (318kg) per station, balanced within 20%
EC-400
1 and 45 degree indexer – 1000 lb per pallet
Full 4th Axis
660 lb per pallet
Pallet Changer Operation
The Pallet Changer is commanded using M Codes. M50 determines if a pallet
has been scheduled. The pallets will change if a pallet is scheduled or the pro
-
gram will pause and prompt the operator the pallet is not scheduled.
G188 uses the pallet schedule table to load and run the program scheduled for
the current pallet. Once the part program completes, the M99 command loops
back to the M50 (pallet change) in order to load the next pallet.
M36 is not used in this method, as M50 monitors the pallet scheduling. M36
is provided for backward compatibility, and to program pallet changes without
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