TQC VF6500 User Manual

HAND-HELD PORTABLE HARDNESS
TESTER

VF6500

User Guide

V1.0 1214

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EN

CONTENT

1. OPERATION 3

2. OPERATION CONTINUED 4

3. MAINTENANCE CONTINUED 5

4. SPECIFICATIONS 6

5. OPERATING INFORMATION CONTINUED 8

6. REPAIR PARTS 9

7. HARDNESS TESTER 10

8. CERTIFIED TEST DISKS 10

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1. OPERATION

The Impressor is intended for handheld testing of hardness for aluminum and aluminum alloys,
soft metals, plastics, berglass, rubber and leather. Harder materials cannot be tested with the
Impressor. For information on the available models, refer to the current revision of our product
guide.

To test a surface, place the indenter point and the leg of the impressor on the same plane of the
surface. To insure reading accuracy, make certain that no indentations from previous use are
within 1/16th of an inch of the present indenter point position. Readings should not be taken
on both sides of the 1/32nd inch-thick test disks. Readings taken on top of old indentations will
adversely aect the accuracy of the reading. An ample supply of appropriate test disks should be
maintained for these reasons.

Press down rmly, but carefully, on the impressor handle. Observe the indicator, noting the peak
reading. For softer materials there will be some falling-o of the reading from the peak value. This
is normal and is due to the nature of the materials being tested.

EN

As a general rule, you should increase the number of readings taken as the softness of the
materials being tested increases. Refer to the table below for recommended minimal numbers of
readings for various materials using the Model GYZJ 934-1. Though specic numbers for Models
GYZJ 935 and GYZJ 936 are not included due to correlation diculties with softer materials, the
numbers suggested for reinforced plastics serve as a starting point for softer materials.

Recommended Numbers of Reading for Model 934-1

GYZJ-934-1 For an Average Recommended
Reading Range Variance of Number of Readings

Homogeneous 80 0.28 3

Material: 70 0.28 4

60 0.28 5

50 0.28 6

40 0.28 7

30 0.28 8

20 0.28 9

Reinforced Plastics: 70 0.72 5

60 0.78 10

50 0.75 16

40 0.78 22

30 0.77 29

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EN

2. OPERATION (CONTINUED)

The indenter point must always be perpendicular to the surface being tested. To maintain
perpendicularity, the leg of the Impressor must be on the same plane as the indenter point, with
both ats of the leg touching the same surface. Irregularlyshaped objects to be tested should be
mounted in a holding jig to assure that perpendicularity is maintained. For at objects, a tempo­rary oset of the leg to accommodate the thickness of the part being tested can be obtained by
placement of washers of appropriate thickness between the leg and the case of the impressor.
Without perpendicularity, accuracy of the reading cannot be assured.

Maintenance

The Impressor is a precision mechanical instrument and should always be handled with care. The
deection indicator built-in to the Impressor has a normal reading of zero when not in use.
The Indenter Point has a tip precisely-machined to very small dimensions. It should be used with
care to prevent damage. Avoid sliding or scraping the Indenter Point when it is in contact with
the surface being tested. If the Indenter Point is damaged, it must be replaced with a new one.
The Impressor ships with two spare Indenter Points.

WARNING

Do not attempt to regrind an Indenter Point when damaged! The mechanical
dimensions of the Indenter Point determine the accuracy of readings
and will create erroneous reading when reground.

To check the condition of the indenter point, rst visually inspect it for damage.
Then place the impressor on a hard, at surface with the appropriate test disk
positioned under the indenter point. Press the impressor handle down rmly, but
carefully, to avoid sideways slippage of the indenter point. The reading on the
indicator should be within the range of values stamped on the test disk. If it is not,
refer to the calibration procedure below.

Replacing the Indenter Point

1. Clean the new indenter with alcohol.

2. Remove the two screws that hold the impressor case halves together (see Figure 1).

3. Lift out the frame while holding the spring sleeve in place (so it will not fall o)
until it can be removed.

4. Loosen the plunger upper guide nut with the provided wrench until the crossnotched
top lip protrudes above the frame.

5. Hold the impressor upside down (so the spring and plunger won’t fall out), then loosen the
locknut with the provided wrench and remove the lower plunger guide.

6. Replace the indenter point in the lower plunger guide, then re-install the lower plunger
guide, leaving about 3/16 of an inch of thread protruding below the frame.

4

7. Tighten the lock nut, then operate the Impressor against a moderately hard surface 20 to 30
times in order to properly seat the indenter.

8. Tighten the plunger upper guide nut until its top is ush with the frame.

9. Calibrate the impressor per the procedure below.

10. Replace the spring sleeve, reassemble the case halves and screws, and test for the
appropriate reading on the test disks.

3. MAINTENANCE (CONTINUED)

Calibration Procedure

For the GYZJ-934-1:

1. Set the top adjustment nut about 1/16 inch below the top of the frame.

2. Calibrate against the 87/89 disk using the bottom adjustment nut.

3. Calibrate against the 43-48 disk using the top adjustment nut.

4. Repeat steps 2 and 3 until both readings are within specications.

EN

For the GYZJ-935 and GYZJ-936:

1. Set the top adjustment nut about even with the top of the frame.

2. Calibrate against the test disk using the bottom adjustment nut.

Test Disks for the Model 934-1

Use the GYZJ 250 test disk stamped 87/89 for the model GYZJ 934-1 in step 2
above. Then use the GYZJ 78 test disk labelled 43-48 in step 3. Iterate between
these test disks until the optimum reading for both disks is obtained. This
procedure will provide the optimum accuracy over the entire range of the 934-1.
If optimized readings cannot be obtained on both test disks, it is an indication that
the indenter point may be damaged. Replacement of the indenter point is
recommended.

The above procedure can also be used between any two reference materials with
known Barcol values at the extremes of a portion of the impressor reading range.
Calibration at these known values will provide enhanced accuracy within that
portion of the range, but not outside of that range.

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EN

Test Disk for the Model 935

Use the GYZJ 69 test disk stamped 87-89 for the Model GYZJ 935 in step 2 above.

Test Disk for the Model 936

Use the GYZJ 70 test disk stamped 48-50 for the model GYZJ 936 in step 2 above.

4. SPECIFICATIONS

NOTE Physical characteristics of very soft materials are such that uniform correlation

between dierent hardness measuring systems cannot be established. For this
reason, conversion curves should be considered tentative. We recommend that
impressor hardness limits for each material be established by test.

Typical Readings of Aluminum Alloys

Alloy and
Temper: 1100-0 3003-0 3003H14 2024-0 5052-0 5052H14 6061T6 2024T3

GYZJ-934-1 35 42 56 60 62 75 80 85
reading:

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Approximate Conversion
Curves for GYZJ-934-1

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Approximate Conversion Curves
for GYZJ-935 & GYZJ-936

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EN

5. OPERATING INFORMATION (CONTINUED)

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6. REPAIR PARTS

EN

Contact factory (RPPL) for repair parts prices

Item GYZJ-934-1 GYZJ-935 GYZJ-936 Description Qty

1 AYRS-62 AYRS-62 AYRS-62 Spring 1
2 BYRF-3114 BYRF-3114 BYRF-3114 Cover Screw 2
3 BYRF-250 BYRF-250 BYRF-250 Frame Screw 1
4 GYZJ-2 GYZJ-2 GYZJ-2 Plunger Upper Guide Nut 1
5 GYZJ-3 AYRS-146-1 AYRS-146-1 Spring† 1
6 GYZJ-4-1 GYZJ-4-1 GYZJ-4-1 Plunger 1
7 GYZJ-6-5 GYZJ-6-5 GYZJ-67 Indenter Point† 1
8 GYZJ-7 GYZJ-7 GYZJ-7 Lever 1
9 GYZJ-8 GYZJ-8 GYZJ-8 Pin 1
10 DYRA-218 DYRA-218 DYRA-218 Pin 1
11 GYZJ-15-2 GYZJ-15-2 GYZJ-15-2 Indicator (not eld servicable) 1
12 GYZJ-16 GYZJ-16 GYZJ-16 Lock Nut 1

- GYZJ-17-1 GYZJ-17-1 GYZJ-17-1 Wrench 1

- GYZJ-19-2 GYZJ-19-2 GYZJ-19-2 Carrying Case 1
13 GYZJ-23-1 GYZJ-23-1 GYZJ-23-1 Case & Frame Assembly 1
14 GYZJ-61 GYZJ-61 GYZJ-61 Stop Ring 1
15 GYZJ-62 GYZJ-62 GYZJ-62 Point Sleeve 1
16 GYZJ-63 GYZJ-63 GYZJ-63 Spring Sleeve 1
17 GYZJ-64 GYZJ-64 GYZJ-71 Lower Plunger Guide† 1
18 GYZJ-65 GYZJ-65 GYZJ-65 Leg 1
19 GYZJ-79-1 GYZJ-79-2 GYZJ-79-3 Label†

† Parts required to convert between models.

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EN

7. HARDNESS TESTER

Model Range

GYZJ-934-1 25 to 50 Brinell (10 mm ball 500 kg load)
GYZJ-935 For softer plastic and very soft metals
GYZJ-936 For extremely soft material

8. CERTIFIED TEST DISKS

Part No. Use with Model Barber-Colman Scale

GYZJ-069-100 Set of 5 GYZJ-935 87 – 89

GYZJ-070-100 Set of 5 GYZJ-936 48 – 50

GYZJ-078-100 Set of 5 GYZJ-934-1 43 – 48

GYZJ-250-100 Set of 5 GYZJ-934-1 87/89

Standard Test Disks

GYZJ-069 Each GYZJ-935 87 – 89

GYZJ-070 Each GYZJ-936 48 – 50

GYZJ-078 Each GYZJ-934-1 43 – 48

GYZJ-250 Each GYZJ-934-1 87/89

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12

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