Crossed Helical Gear Design

Dear frnds,

Crossed helical gear design- Reg, if you know plz revert back to me..

Existing available data are follows,

1. Gear Helical,

No. of teeth : 14 nos

Addendum modification co-eff,: -0.4

Helix angle: 67 deg 15 mins

PCD,:28.32 mm

2. Helical pinion data:

No. of teeth : 9 nos

Addendum modification co-eff: -0.2

Helix angle: 28 deg 45 mins

PCD: 7.89 mm

Common to both gear & pinion,

Tooth form : shifted gear

Tooth: Full depth tooth

centre distance : 18.3 mm

Module: 0.8 mm

pressure angle: 20 deg.

Shaft angle: 96 deg.

From the above data, I need justification for addendum modification co-eff, helix angle & PCD relation ship.

How to arrive addendum modification co-efficient factor?

Thanks & Regards,

Prakash R

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