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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.

PWM Tipster

Stylus Anatomy 101

Call Out Description
dk Ball diameter
ds Shank diameter
D Ferrule diameter
L Overall length
ML Working length
M Thread
Wt. Approximate weight, in grams
Drawings are not to scale. Consult charts for actual dimensions

Ball and Shank Assembly

drilled ball/pivot mount stylus

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

undrilled ball stylus

Solid Ball Mount: An undrilled ruby is glued directly to the end of the shank

Advantages of Shank Materials:

Carbide:
  • Sub-mircon deflection
  • Small diameters
  • Non-magnetic
Stainless Steel:
  • Durable
  • Lowest cost
  • Wide-spread acceptance
Ceramic
  • Zero deflection
  • Light weight
  • Easy to see
  • Same Coefficient of Thermal Expansion as ball
  • Non-magnetic
Carbon Fiber:
  • Great for high speed machines
  • Light weight minimizes false triggering
  • Use for long stylus configurations
  • Non-magnetic
Sapphire:
  • Light weight
  • Maximum strength
  • Highest accuracy
  • Same Coefficient of Thermal Expansion as ball
Technical Data
Item Material Form Deviation Diameter Tolerance Hardness
(Vickers)
Density
(g/cm3)
Surface Finish
Ruby ball Synthetic ruby AI203 monocrystalline <0.2µ ±0.25µ 1800 3.9 0.015µ
Hollow ceramic balls Alumina, AI2O3 ceramic polycrytalline <0.6µ ±0.6µ 1650 3.9 0.1µ
Cylinder Stainless steel <2µ ±10µ 250 7.9 0.4µ
Cylinder Synthetic ruby AI2O3 monocrystalline <1µ ±1µ 1800 3.9 0.5µ
Cylinder Tungsten carbide <1µ ±1µ 1550 15.0 0.2µ
Ball disc, ceramic Ceramic, alumina AI2O3 ceramic polycrystalline <0.6µ ±0.6µ 1650 3.9 0.1µ
Ball disc, steel Stainless steel <3µ ±10µ 250 7.9 0.4µ
Ball disc, steel Hardened steel <2µ ±10µ 720 7.9 0.2µ
Shank or Extension Stainless steel - - - 7.9 -
Shank or Extension Ceramic, alumina AI2O3 ceramic polycrystalline - - - 3.9 -
Shank or Extension Carbon fiber - - - 1.5 -
Shank Tungsten carbide - - - 15.0 -
Extension 7075 high strength aluminum Hard coat anodized surface with PTFE inserts 2.8 -

Grade Tolerances Chart
A.F.B.M.A. Standards

A.F.B.M.A. Grade Diameter Tolerance per Ball Sphericity Diameter Tolerance per Unit Container Basic Diameter Tolerance Marking Increment
Inch Inch Inch Inch
3 .000003 .000005 ±.00003 .000003
5 .000005 .00001 ±.00005 .000005
10 .000010 .00002 ±.0001 .000010
15 .000015 .00003 ±.0001 .000015
25 .000025 .00005 ±.0001 .000025
50 .00005 .0001 ±.0002 .00005
100 .0001 .0002 ±.0005 .0001
200 .0002 .0004 ±.0010 .0002

Definitions: