The saw is built on a structural weldment with integral fork pockets and wireways.
A strategically placed baffle impinges sparks from the cut and decelerates larger particles so they
drop into the easily removable debris drawer for clean out. The saw head and work holding
devices are aligned on a ground top plate mounted to the base. The compact design minimizes
required floor space.
The saw head is designed for cutting with a nominal 26”/660mm diameter abrasive
wheel at up to 12,000sfm or 60m/sec wheel speed (Vc). The saw’s rocker arm is a heavy aluminum
casting, heat treated, and is precision machined for the crucial bearing-to-trunnion shaft
alignment that provides for straight, vertical cuts. The rocker arm rotates on a trunnion stand that
also acts as the oscillation pivot arm. The structural aluminum castings are T6 heat treated for
stiffness and long life. It is a time-proven design that has survived field testing and has contributed
to the Severit-with-Everett reputation for reliability for over 58 years.
The 2,090-rpm main wheel spindle drives the 8.5”/216mm cast iron
wheel flange. The abrasive cutoff wheel is mounted on a 1”/25.4mm arbor shaft and clamped by
the outer wheel flange. The wheel flanges are assembled on the shaft and faced and trued as an
assembly for balance and straightness. The inner wheel flange is equipped with a 5/8”/16mm
diameter drive pin on a 3”/75mm bolt circle diameter. Refer to ANSI B7.1, EN 12413 and FEPA for
complete guidelines. The wheel spindle is improved from our catalog saws for easy
interchangeability.
A 40HP/30kW induction motor is standard or a 50HP/37.5 kW
induction motor is optionally available. Standard spindle motor speed is 1725RPM
(11,800sfm/56m/s) operating with across the line starters. Motor control system also includes a
stand-alone “zero-speed” safety monitoring relay. If the optional Sinamics VFD is purchased,
wheel speed would typically be 14,200sfm/71m/s. Drive includes standard VFD features as well
as ProfiSafe communications, Safe Torque Off (“STO”), Safe Stop One (“SS1”) and other safety-
related functionality. Saw head is equipped with precision inclinometer to enable wheel diameter
tracking based on cut start position. With known wheel diameter, control will adjust the wheel
RPM to maintain a constant peripheral wheel speed. The drive and PLC monitor cutting power
and actual wheel speed and abort overly aggressive cuts to protect the operator and machine.
The VFD also allows for dynamic wheel braking to stop the wheel in 3 seconds for fast part-to-part
changes as the doors will not unlock until the safety system detects zero-wheel speed…which can
take 30-50 seconds without motor braking.
The saw control system provides your operator process feedback
in real time to protect the operator, wheel, work, and saw from overly aggressive cutting. A LED
indicator flashes colored and audible codes during the cutting cycle. Green for a moderate process
(<80% of drive current use), yellow/magenta during moderately aggressive cutting (>80% but less
than 100%) and red for very aggressive cutting (>100%). This feedback helps train the operator to
use the power available for fast cutting cycles, but not so fast as to shorten the life of the saw and
motor…or to shatter the wheel, damage the work, or damage the machine.
The saw head is equipped with an oscillating trunnion stand that, setup
dependent, can oscillate the wheel front to back during the cut. The oscillator is driven by a motor and gearbox that, when active in the cutting setup, moves the wheel forward and backward,
relative to the work piece centerline, approximately 3/8”/10mm which reduces the effective
length of contact, provides for chip evacuation, and cools the cut.
The saw head is fed through the cut by the same
industrial-duty hydraulic cylinder (equipped with abrasive environment seals) that has made
Everett powerhead saws known for reliability. The hydraulic system is controlled by an
appropriately sized power unit complete with pump, reservoir, pressure relief, proportional-
directional valve, and associated control switches and safety valving. The power unit also controls
hydraulic work clamping, if so equipped.
Standard work holding is a V-vise with air-operated chain hold down on the left
side of the wheel. Depending on your application, alternate work holding designed for bar and
tube or shapes can be provided.
The saw system’s motors, hydraulics, operations, and programming are
controlled by a failsafe PLC and associated failsafe I/O cards. The main spindle ABB/Baldor motor
is controlled by a VFD with dynamic braking. Hydraulic motion is coordinated by the PLC through
a proportional-directional valve as commanded by the PLC and speed-control potentiometer.
This is a production saw designed for injury-free
operations in a modern manufacturing environment. The system is designed to adhere to the best
functional safety practices (ISO13849) and to be EN Machinery Directive compliant. The safety
systems were designed based on a detailed and comprehensive formal risk assessment. The vice
clamps and cutting area are fully protected in the interlocked machine enclosure for safety and to
contain smoke and debris. Easy access, interlocked doors allow for easy wheel change and clean
up yet protect your operator from the common dangers of an open, tool room chop saw originally
designed for highly skilled operators. Safety interlocks prevent automatic operation of the saw if
the guarding is not secured or if the wheel is turning. Cycle start requires two-handed control,
including actuation of the clamps, for operator safety.
