390 TECHNICAL INFORMATION 1. Cutter Rack Dimensions and Tolerances The pulley should have involute tooth, which are created and shaped by the cutter. For the cutter rack dimensions and tolerance, when the rack shape of the tooth profile generating cutter is measured by using a projector, shape measuring instrument, etc. the measurement results must meet the following conditions indicated on the table below: Unit: mm 2. Tolerance of Adjacent Pitch Error and Cumulative Pitch Error Unit: mm 3. Tolerance of Side Deflection Unit: mm 4. Tolerances of Addendum Circle Diameter Unit: mm 5. Tolerance of Circumferential Deflection of Addendum Circle Unit: mm 6. Tolerance of Cylindricity and Parallelism Unit: mm g hr a b P A A t r r 2 1 Number of Teeth of the Pulley Z A ±0.12 hr + 0.05 0 bg + 0.05 0 r1 ±0.03 r2 ±0.03 2a(1) (Reference) Type Pt MXL 10 ≤ Z ≤ 23 2.032 ± 0.008 28° 0.64 0.61 0.30 0.23 0.508 24 ≤ Z 20° 0.67 XL 10 ≤ Z 5.080 ± 0.010 25° 1.40 1.27 0.61 0.61 0.508 L 10 ≤ Z 9.525 ± 0.012 20° 2.13 3.10 0.86 0.53 0.762 H 14 ≤ Z ≤ 19 12.700 ± 0.016 20° 2.59 4.24 1.47 1.04 1.372 20 ≤ Z 1.42 Note ( 1 ) : a indicates the position equivalent to the pitch line (Centerline of the Core Line of the Belt) of the belt corresponding to the cutter rack shape. Addendum Circle Diameter of Pulley d0 "MMPXBCMF 7BMVF Tolerance of Adjacent Pitch Error Accumulated Pitch Error 5.96 ≤ do ≤ 25.40 0.03 0.05 25.40 < do ≤ 50.80 0.03 0.08 50.80 < do ≤ 101.60 0.03 0.10 101.60 < do ≤ 177.80 0.05 0.13 177.80 < do ≤ 304.80 0.05 0.15 304.80 < do ≤ 508.00 0.08 0.18 508.00 < do ≤ 762.00 0.08 0.20 762.00 < do ≤ 967.16 0.08 0.23 Addendum Circle Diameter of Pulley d0 Tolerance of Deflection (TIR)(2) 5.96 ≤ do ≤ 101.60 0.10 101.60 < do ≤ 254.00 Addendum Circle Dia. do×0.001 254.00 < do ≤ 967.16 0.25+[(Addendum Circle Dia. d0-254.00)×0.0005] Note ( 2 ) : TIR is an abbreviation for Total Indicator Reading and refers to the difference between the max. deflection reading and the min. deflection reading. Addendum Circle Diameter of Pulley d0 Tolerance 5.96 ≤ do ≤ 25.40 +0.05 0 25.40 < do ≤ 50.80 +0.08 0 50.80 < do ≤ 101.60 +0.10 0 101.60 < do ≤ 177.80 +0.13 0 177.80 < do ≤ 304.80 +0.15 0 304.80 < do ≤ 508.00 +0.18 0 508.00 < do ≤ 762.00 +0.20 0 762.00 < do ≤ 967.16 +0.23 0 Addendum Circle Diameter of Pulley d0 Tolerance of Circumferential Deflection 5.96 ≤ do ≤ 203.20 0.13 203.20 < do ≤ 967.16 0.13 + [ ( Addendum Circle Dia. d0-203.20 ) × 0.0005 ] Nominal Widths of Pulley Cylindricity Tolerance Parallelism Tolerance 025~050 0.01 0.03 075~150 0.02 200 · 300 0.04 0.04 400 · 500 0.06 0.05 Timing Belt Toothed Pulleys
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