Proceq Equotip 550 Operating Instructions Manual page 20

3.3.2.4 Test Conditions
To ensure proper hardness readings, the following conditions must be
fulfilled. If one or more conditions are not met, the result may be signifi-
cantly false.
Probe setup 50 N
probe
with
clamp
Minimum test
piece thickness
Maximum test
40 mm
piece thickness
Test piece surface recommended mean surface roughness
condition
R < 2 μm to minimize data scatter
a
Surface
curvature
Maximum test
piece hardness
Minimum spacing
three times the diameter of a test indentation
Table 3:
Portable Rockwell Test Piece Requirements
20
50 N probe 50 N 50 N probe
with round probe with spe-
standard with cial feet
foot (ø = tripod
42 mm)
1 mm at ~20 HB
130 μm at ~70 HRC
N/A
very
foot to be 18 – 70 mm
small cur-
used for radius of
vatures
plane curvature or
accepta-
70 mm – ∞
surfaces
ble
70 HRC
3.3.2.5 Installing the Measuring Clamp
The clamp is designed to facilitate the hardness testing of very thin or
small samples.
Cantilever
Cantilever screw
Knurled screw
Probe holder
Figure 16: Portable Rockwell Clamp
• Use the 3 mm Allen key setup tool to release the cantilever. Turn it by 90°.
• Take the probe and remove the foot. The diamond indenter remains
mounted.
• Screw the probe into the probe holder of the clamp clockwise (hand-tight).
• Turn the cantilever so its tip is centred over the probe; tighten the can-
tilever screw securely using the 3 mm Allen key setup tool.
• The recommended clearance between the bottom of the probe holder
and the sample surface should be between 2 and 5 mm. Adjust the
height with the two knurled screws.
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