
Paul W. Marino Gages, Inc.
413 NE Baker Road, Stuart FL 34994 USA
Phone/Text: 313.300.0134 email pwminc@pmargage.com



CMM Styli and Accessories Technical Data
Technical data is supplied to assist you in understanding our products. If you require additional information please call us at (528) 759-2400 or send us an email.

Stylus Anatomy 101

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dk: Ball diameter
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ds: Shank diameter
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D: Ferrule diameter
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L: Overall length
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ML: Working length
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M: Thread
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Wt.: Approximate weight (in grams)
Drawings are not to scale, please refer to our catalogs for actual dimensions.
Ball and Shank Assembly

Pivot Mount: A drilled ruby ball is glued to the reduced tip end of the shank.

Solid Ball Mount: An undrilled ruby ball is glued directly to the end of the shank .
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0.4mm and smaller diameter balls cannot be drilled for pivot mounting
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Drilled ball / pivot mount designs are recommended for 0.5mm diameter and larger balls for long life and durability.
Advantages of Different Shank Materials
Tungsten Carbide:
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Sub-micron deflection
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Small diameter shanks possible
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Non-magnetic
Ceramic:
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Zero deflection
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Light weight
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Easy to see
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Same Coefficient of Thermal Expansion as the ball
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Non-magnetic
Stainless Steel:
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Durable
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Lowest cost
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Wide-spread acceptance
Carbon Fiber:
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Great for high speed machines
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Light weight minimizes false triggering
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Use for long stylus configurations
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Non-magnetic
Sapphire:
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Light weight
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Maximum strength
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Highest accuracy
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Same Coefficient of Thermal Expansion as the ball
Stylus Technical Data
(Scroll down through table to see data for additional materials).
Grade Tolerances Chart / A.F.B.M.A. Standards
(Scroll down through table to see data for additional materials).
Definitions:
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Grade: The numerical value of the diameter Tolerance per Ball expressed in millionths of an inch.
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Diameter Tolerance per Ball Sphericity: The permissible difference between the largest diameter and the smallest diameter measurable on one ball
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Diameter Tolerance per Unit Container: The permissible range on the average diameters of the individual balls within any one container
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Basic Diameter: The size ordered which is the basis to which the basic diameter tolerances apply. The Basic Diameter is specified by a fraction plus a decimal, or a decimal only, to the sixth place, e.g. 1/4"+ .0002" or .2502" or 15/64"+.0003" or .234675".
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Basic Diameter Tolerance: The maximum allowable deviation of any ball diameter from the basic diameter, in any shipment to fill orders for that basic diameter
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Marking Increments: The standard unit steps in millionths of an inch used to express the specific diameter