3.3.1 Contact points. Unless otherwise specified, standard 1/4 inch long contact points shall be supplied with Type A and B indicators. When specified, button, cone, or ball contact points shall be supplied. Extra length contact points for Type C indicator shall be supplied when specified, providing that such contacts do not have an effect on the accuracy of the indicator.
3.3.2 Hole attachment. When specified, a hole measuring attachment with a depth capacity of 1-11/16 inch shall be supplied with Type A or B indicators. The device shall be capable of being securely attached to the spindle housing.
3.3.3 Stanchion bases. When specified, a stanchion base shall be supplied with the dial indicator and shall consist of the following components:
(1) A base and upright column with a minimum diameter of 0.465 inches by 8 inches long minimum with provision for attaching the column securely to the base.
(2) A dial holding rod 3/8 inch diameter by 5-1/4 inches long minimum with a thumbscrew clamp for attaching the indicator and a sliding swivel clamp for holding the indicator rod the upright column in any fixed position by tightening a thumbscrew or screws. The clamp and dial holding rod shall be capable of turning and swiveling 360 degrees on the upright column. The assembly shall contain a reducing bushing as specified.
(3) The standard stanchion base shall be 2-3/16 inches by 2 inches by 8-1/4 inches minimum with a longitudinal slot top and bottom for attaching the upright column.
3.3.4 Arbor clamp. When specified, an arbor clamp shall be furnished with the indicator. The clamp shall be essentially a “C” clamp with a 5/16 inch diameter by 5 inches long minimum forcing screw. The anvil with a “V” notch shall be opposite the forcing screw. The capacity of the clamp shall be not less than 1-1/4 inches. Shall be furnished with a tapped hole for mounting 5/16 inch diameter rod (one end threaded) to allow extension bar to be securely installed at 90 degrees angle to the clamp.
3.3.5 Tool post. Tool post mounting for Type C indicators shall be supplied when specified. The tool post mounting shall be either a holding bar with swivel clamp or universal friction holder with a universal swiveling arm and body clamp as specified.
3.3.6 Test sets (tool post type), Type B indicators. Type B indicator test sets shall be supplied with the following components:
(1) Type B indicator as specified.
(1) 1/4 inch by 5/16 inch clamp (complete sleeve)
(1) Hole attachment
(1) Arbor clamp
(1) Tool post holder, 3/8 inch by 3/4 inch by 5-3/4 inches,
long minimum, with 5/16 inch diameter by 3-1/4 inches, upright post.
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