Barber Colman GYZJ Barcol Impressor - Operation and Calibration

Operation	Conversion	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

Operation

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.

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 affect the accuracy of the reading. An ample supply of appropriate test disks should be maintained for these reasons.

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

Conversion

Approximate Conversion Curves for GYZJ-934-1

Approximate Conversion Chart for GYZJ-934-1 to Brinnell, Vickers and Rockwell

934-1	Brinnell	Vickers	Rockwell
934-1	Brinnell	Vickers	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

Calibration

For the GYZJ-934-1

Set the top adjustment nut about 1/16" below the top of the frame.
Calibrate against the 87/89 disk using the bottom adjustment nut.
Calibrate against the 43-48 disk using the top adjustment net.
Repeat steps 2 and 3 until both readings are within specifications.

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).