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MN ISHW- -E
IS HW
WE BSTER HARDNESS TESTER
OP ER ATION MAN UA L
Attention
Excessive pressure on the handle may damage the anvil.
Torsion and slide of the workpiece will damage the indenter.
The tester is not at its best accuracy below 4HW and above 17HW.
The distance between the indentation and the edge of the workpiece
should be greater than 5mm.
The distance between any indentations should be greater than 6mm.
The surface of the workpiece must be vertical to the indenter.
The back side of specimen must be in good contact with the anvil.
Dirty workpiece will result in inaccurate readings.
The oxide film of 10μm can affect the test result by up to 0.5~1HW.
The painting on the workpiece must be removed before testing.
Slow force application will result in a slightly lower reading.
Use the calibration sheath with the ISHW-L20A tester when testing
on thin workpiece and test block.
1
20 by regulating the adjustment screw, the indente r is worn a nd
needs to be changed.
2. Calibration of the load spring
Screw off the pivot screw, and take out the handle from the frame,
then remove the dial head from the indenter cylinder, leaving the
cylinder in the frame. Then the adjustment nut can be seen in the
indenter cylinder. Rotate the adjustment n ut w it h the calibration
wrench. If the reading of the test block is smaller than the number
marked on the test block, rotate the adjustment nut counterclockwise,
otherwise, rotate the adjustment nut clockwise. When the n ut i s
rotated 30o t o 45o, the reading will change by 1unit. Reassemble
the tester and verify the tester both on the te st b lo ck and on t he
anvil after regulating it.
Note: Do not calibrate the readings of the test block by regulating
the adjustment screw.
Product introduction
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2
3
Technical specification
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3. anvil 1. reading dial 2. indenter
4. pivot screw
Changing the indenter
In case the reading can n ot b e set to th e full sca le of 20 by regul at in g
the adjustment screw, which means the i nd en ter is worn, the indenter
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should be changed. Follow the steps below to change the indenter.
Screw off the pivot screw, and take out the handle from the frame, then
emove the dial head from the indenter cylinder, leaving the cylinder in
the frame. Then the adjustment screw can be seen in the indenter cylinder.
Rotate the adjustment screw off with the calibration wrench, t hen take
the indenter out and replace with a new indenter.
After the indenter is replaced, the load spring needs to be adjusted with
the adjusting nut. Only one rotation of the calibration nut is enough after
the resistance of the load spring is felt. The indenter tip will be damaged
by excessive pressure of the load spring after indenter replacement.
Maintenance
Prevent dust and dirt.
Prevent rust.
Prevent falling off.
Do not disassemble the dial head.
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Code
Application
Thickness requirement
of flat workpiece
Internal diameter
requirement of tube
workpiece
Wal l thi ckn ess
requirement of
tube workpiece
Hardness range
Min.reading
Accuracy
Dimension
ISHW-L20 ISHW-L20A I SHW-L20B
for aluminum for aluminum alloy for aluminum
alloy general use thick workpiece alloy small tube
0.6~6mm 0.6~8mm
>Ø10mm >Ø10mm >Ø6mm
0.6~6mm
0.6~13mm
6~13mm
(internal diameter
Ø10mm~23.3mm
0.6~6mm
(internal diameter
>Ø23.3mm)
0~20HW
1HW
±0.5HW(at 5~17HW)
205x30x85mm
)
0.6~8mm
Code
Application
Thickness requirement
of flat workpiece
Internal diameter
requirement of tube
workpiece
Wal l thi ckn ess
requirement of
tube workpiece
Hardness range
Min.reading
Accuracy
Dimension
ISHW-B70 ISHW-B75 ISHW-B9 2
aluminum alloy
and hard brass
0.6~6mm 0.6~6mm
>Ø10mm >Ø6mm >Ø10mm
0.6~6mm 0.6~6mm0.6~8mm
for soft brass
and copper
0.6~8mm
0~20HW
1HW
±0.5HW(at 5~17HW)
205x30x85mm
for soft steel for hard
and cold-rolled
steel
Standard delivery
Main unit
Spare indenter
Hardness test block
Wrench
Screwdriver
Calibration sheath(ISHW-L20A )only
1pcs
1pcs
1pcs
1pcs
1pcs
1pcs
Indenters mode
The Webster hardness tester have different mode of indenters.
A. ISHW-L20、
ISHW-L20B
ISHW-L20A
B. ISHW-B75 C. ISHW-B92
Basic operation
Pu t the specimen between th e a nv il and t he indente r cylind er, then
pr es s the han dle down until t he i nd ic ator h an d come to a s to p. Kee p
the handle pressed and take the reading.
Verification and calibration
Verification
1
The operat or sh ould verif y the acc ur ac y of the test er regularly.
Calibration should be ma de if the test er is found inaccurate. When
testing on the hardness block, use its upper surface only.
1. Verification of the full scale
Press the handle to the bottom without putting any specimen on
the anvil of the hardness tester. The indicator should po int at 20
±0.5HW. If the reading is o ut of toleranc e, f ul l scale c alibrati on
should be carried out.
2. Verification of the test block
Test on the s tandard test block. For ISHW-L20, ISHW-L20A, IS
HW-L20B testers, the reading should be ±0.5HW of the hardness
number marked on the blo ck. For ISHW-B70, ISHW-B92 testers,
the reading should be 5HW±0.5HW; and for ISHW-B75, the reading
should be 17HW±0.5HW. If t he rea di ng is out o f toleranc e, load
spring calibration should be carried out.
Calibration
2
The calibration of the Webster hardness teste r includ es full scale
calibration and lo ad sprin g calibr at io n. Full sc ale calibration is to
set a benchmark, and load spring calibration is to provide a reference
po in t for the tester. Be fo re cal ib ra tion o f the ISHW-L 20 A, p ut the
calibrating sheath on the anvil first.
1. Calibration of the full scale
Press the handle to the bottom without putting any specimen on
the anvil of the hardness tester. Regulate the full-scale adjustment
screw with a small screwdriver to bring the indicator at 20. If the
reading is smaller than 20, the adjustment screw should be regulated
clockwise; if the reading is greater than 20, the adjustment s cr ew
should be regulated anticlockwise. If the pointer can not be set to
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