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Home Barber Colman GYZJ Barcol Impressor - Operation and Calibration
Barber Colman GYZJ Barcol Impressor - Operation and Calibration
Simply exert alight pressure against the instrument to drive the spring-loaded indenter point into the material. See the typical readings of aluminum alloys and review the approximate conversion curves for the barcol impressor models. Follow the step by step calibration procedure for the Barcol Impressor. Use the included tool to begin the procedure. View Operation View Conversion View Calibration The Impressor is intended for handheld testing of hardness for aluminum and aluminum alloys, soft metals, plastics, fiberglass, 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.
Press down firmly, but carefully, on the impressor handle. Observe the indicator, noting the peak reading. For softer materials there will be some falling-off of the reading from the peak value. This is normal and is due to the nature of the materials being tested.
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 specific numbers for Models GYZJ 935 and GYZJ 936 are not included due to correlation difficulties with softer materials, the numbers suggested for reinforced plastics serve as a starting point for softer materials.
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 flats 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 flat objects, a temporary offset 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.
Recommended numbers of readings for Model GYZJ 934-1
Reading Range Number of Readings Average Variance of Homogeneous Material 20 9 0.28 30 8 0.28 40 7 0.28 50 6 0.28 60 5 0.28 70 4 0.28 80 3 0.28 Reinforced Plastics 30 29 0.77 40 22 0.78 50 16 0.75 60 10 0.78 70 5 0.75 Typical Readings of Aluminum Alloys
Alloy and Temper: 1100-0 3003-0 3003H14 2024-0 GYZJ-934-1 Reading: 35 42 56 60 Alloy and Temper: 5052-0 5052H14 6061T6 2024T3 GYZJ-934-1 Reading: 62 75 80 85 Approximate Conversion Curves for GYZJ-934-1
Approximate Conversion Chart for GYZJ-934-1 to Brinnell, Vickers and Rockwell
934-1 Brinnell Vickers Rockwell B E F H 35 23 32 36 23 33 37 24 37 38 24 40 39 25 43 40 25 25 45 41 26 26 47 42 26 27 49 43 27 27 52 44 27 28 54 45 27 20 56 46 28 30 58 47 29 32 24 61 48 30 33 25 63 49 31 34 28 64 50 32 35 30 66 51 33 36 33 68 52 34 38 36 70 53 35 39 39 29 72 54 37 41 42 33 73 55 38 42 44 38 75 56 39 44 46 40 76 57 40 45 48 43 78 58 42 47 51 47 80 59 44 48 53 49 81 60 45 49 55 51 83 61 47 51 57 54 84 62 48 53 59 56 86 63 50 55 62 58 88 64 52 57 64 61 89 64 54 58 65 63 90 66 55 60 67 65 91 67 58 62 69 67 92 68 60 64 71 69 94 69 62 67 73 71 95 70 64 69 18 74 73 96 71 67 72 19 76 75 98 72 69 74 28 77 77 99 73 71 76 33 79 79 100 74 73 81 39 81 81 101 75 76 85 45 83 83 102 76 80 88 48 84 84 103 77 84 92 52 86 86 104 78 87 95 56 88 87 105 79 90 99 60 89 88 106 80 94 103 63 90 89 107 81 97 108 65 91 90 108 82 100 111 69 92 91 108 83 105 116 72 94 92 109 84 109 122 75 95 93 109 85 113 127 77 96 94 110 86 117 133 80 97 95 111 87 122 137 83 98 96 111 88 126 142 86 99 97 112 89 131 144 89 100 97 112 90 135 91 101 98 113 91 139 102 99 113 92 145 103 100 93 103 101 94 104 101 95 104 102 96 105 102 97 106 103 98 107 99 108 100 108 Approximate Conversion Chart for GYZJ-935 and GYZJ-936 to Type D Durameter
Type D Durameter Type D Durameter GYZJ-935 & GYZJ-936 GYZJ-935 GYZJ-936 GYZJ-935 & GYZJ-936 GYZJ-935 GYZJ-936 4 64 52 18 67 56 6 65 52 20 68 56 8 65 53 22 68 57 10 65 53 24 68 58 12 66 54 26 69 58 14 66 54 28 69 59 16 67 55 Shore (Type) D Durameter Shore (Type) D Durameter GYZJ-935 & GYZJ-936 GYZJ-935 GYZJ-936 GYZJ-935 & GYZJ-936 GYZJ-935 GYZJ-936 30 70 60 44 74 65 32 70 60 46 74 66 34 71 61 48 75 67 36 71 62 50 75 68 38 72 63 52 76 69 40 73 64 54 77 70 42 73 64 56 71 Shore (Type) D Durameter Shore (Type) D Durameter GYZJ-935 & GYZJ-936 GYZJ-935 GYZJ-936 GYZJ-935 & GYZJ-936 GYZJ-935 GYZJ-936 58 78 72 74 84 80 60 79 73 76 85 81 62 79 74 78 85 83 64 80 75 80 86 84 66 81 76 82 87 85 68 82 77 84 88 86 70 82 78 86 89 87 72 83 79 88 N/A 89 For the GYZJ-934-1
For the GYZJ-935 and GYZJ-936
- Set the top adjustment nut about even with the top of the frame.
- Calibrate against the test disk using the bottom adjustment nut (#12 Plunger Lock Nut).
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