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Technical InformationStandard Gear Range
Technical section index
Page
Gear tolerances ...................................................... 56
Standards for fine pitch gears.................................. 57
Metric modules and circular pitches ........................ 58
Materials and specifications .................................... 59
Spur gear geometry ..................................................60
Spur gear terminology ............................................ 61
Gears with small numbers of teeth.......................... 63
Engineering data .................................................... 64
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55
Standard Gear Range
Technical Information
Reliance precision instrumentation gears are manufactured using high accuracy gearcutting equipment. Standard gears are produced in stainless steel, hardened stainless steel, aluminium alloy and brass (wormwheels only). Alternative materials such as PEEK™ plolymer or Delrin are available on request.
GEAR TOLERANCES
Gears are generally offered as Quality 10 (see the individual product pages). Higher qualities are available as shown in the table below. Most gears in the catalogue can be produced in these qualities to order.
Reliance standard tolerances are largely based on AGMA 390-03 backlash.
Reliance Standard Gear Qualities
Quality
Class
AQ10
AQ11
AQ12
AQ14
AQ10
AQ11
AQ12
AQ14
Modular
Range
0.8 to 0.5mod
0.4 to 0.2mod
Table values in 0.001mm (0.0001")
Total
Tooth to Tooth
Composite Composite
Error
Error
26
18
13
7
26
18
13
7
(10)
(7)
(5)
(2.7)
(10)
(7)
(5)
(2.7)
13
10
8
3.6
13
10
8
3.6
(5)
(4)
(3)
(1.4)
(5)
(4)
(3)
(1.4)
Indicator Limits
Gauge zeroed at std. pitch rad.
Max
-18
(-7)
-13
(-5)