Checkline EDM User Manual
Page 2
2
1.0 I
NTRODUCTION
DX2-EDM Tension Meters are hand-held, mechanical instruments which
accurately measure the running as well as static tensions at the wire used
in wire EDM machines.
The DX2-EDM employs the 3-roller principle for tension measurement where
the outer two reference guide rollers remain fixed during measurement to establish a
wrap angle over the middle sensing roller. The middle roller, acting against an internal
calibrating spring, is displaced relative to the line tension. This displacement is con-
verted to rotary motion to turn a pointer on a scale to give a reading in grams tension.
1.1 Complete
Kit
(included in shipment)
• Tension meter
• Special finger support
• Operating instructions
• Carrying case
1.2 Unpacking
Unpack the tension meter
and inspect it for any
shipping damage. Notices
of defect must be filed
within 10 days of receipt
of the tension meter.
1.3 Model
Ranges
Tension Roller
Calibration
Ranges (cN)
Distance (c:c) mm
Material
050 - 2000
0
75
PA: 0.30 mmØ
150 - 2200
0
75
PA: 0.30 mmØ
100 - 3000
0
75 PA: 0.30 mmØ
200 - 4000
100
PA: 0.40 mmØ
Operating Instructions behind foam pad.
7
5.0 O
PTIONS
5.1 Air Dashpot Damping
DX2-EDM Tension Meters incorporate a
moderate amount of movement damping to
smooth out some high frequency tension
fluctuation. However, where process fluctuations
result in rapid pointer swings which make it
difficult or near impossible to read the scale,
an optionally-available Air Dashpot Damping
mechanism can be provided to slow down the
pointer swings to permit a reading. In setting up the mechanism, it is best to set
the damping rate just to the point where a readable pointer results with minimal
pointer swings. The amount of damping is set by turning the small slotted screw
or hex-head screw of the damping assembly located near the guide-roller mount-
ing bracket. The Air Dashpot must be installed at time of original manufacture.
It cannot be added later.
5.2 Memory Pointer
The optional Memory Pointer assembly retains the highest
reading obtained during a measuring period. Before using
the instrument, rotate the knurled pointer knob clockwise
until the “memory” pointer tab contacts the measuring
pointer at zero. During operation and after instrument
removal, the trailing “memory” pointer will hold the
maximum reading until reset with the pointer knob.
CAUTION
Do not set the damping rate too high as this will
damage the instrument.