All dimensions are as ratios of the Module M in Millimeters and are to British Standard 978 : Part 2. As Swiss Standard NHS 56702, except where marked with *.
Module M | Up to and including 0.45, and 1.1 to 1.5 | 0.5 and up to and including 1.0 | Short form 0.2 to 1.0 | Round Bottom * 0.2 to 1.0 NHS 56704 |
Number of teeth | N | N | N | N |
Pitch circle diameter | N xM | N x M | N x M | N x M |
Diameter of blank | (N + 2.76) x M | (N + 2.76) x M | (N + 2.76) x M | (N + 2.50) x M |
Root diameter | (N -3.14) x M | (N - 4) x M* | (N - 2.14) x M | (N - 3.5) x M |
Tooth thickness | 1.57 x M | 1.57 x M | 1.57 x M | 1.41 x M |
Addendum radius | 1.93 x | 1.93 x M | 1.93 x M | 2.00 x M |
Angle of cutter flank | 2 degrees | 2 degrees | 2 degrees | 4deg 43min |
Addendum | 1.38 x M | 1.38 x M | 1.38 x M | 1.25 xM |
Dedendum | 1.57 X M | 2 x M * | 1.07 x M | 1.75 x M |
Full tooth depth (depth of feed) | 2.95 x | 3.38 x M | 2.45 x M | 3.0 x M |
All dimensions as ratios of Module. M. in millimeters.
British Standard 978: part 2. As Swiss Standard NHS 56703 except where marked *
Number of leaves | 6 | 7 | 8 | 10 | 12 | 16 |
Pitch circle diameter | 6 | 7 | 8 | 10 | 12 | 16 |
Diameter of blank | 7.71 | 8.71 | 9.71 | 11.61 | 13.61 | 17.61 |
Root diameter * | 2.84 | 3.3 | 4.2 | 5.9 | 7.8 | 11.8 |
Leaf thickness | 1.05 | 1.05 | 1.05 | 1.25 * | 1.25 | 1.25 |
Addendum radius | 1.05 | 1.05 | 1.05 | 0.82 | 0.82 | 0.82 |
Form of Addendum | Full ogive | Full ogive | Full ogive | 1/3 ogive | 1/3 ogive | 1/3 ogive |
Angle of cutter flank | 20 deg | 17deg 9 mins | 15deg | 10deg 48mins | 9deg | 6deg 45mins |
Tooth / pitch ratio | 1/3 | 1/3 | 1/3 | 2/5 | 2/5 | 2/5 |
Addendum | 0.855 | 0.855 | 0.855 | 0.805 | 0.805 | 0.805 |
Dedendum | 1.58 | 1.85 | 1.90 | 2.05 | 2.10 | 2.10 |
Full tooth depth | 2.435 | 2.705 | 2.755 | 2.755 | 2.905 | 2.905 |
Full Ogive profile 1/3 Ogive.
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