Specification of tool data

The cutter module m₀ and tool edge radius ρ_a0 must be specified to calculate the settings of a virtual gear cutting machine in addition to the ISO 23509

 gear dimension data. The cutter module m₀ determines the cutter parameters of standard cutters, such as cutter height and cutter edge radius as well as the reference point for the cutter sphericity. The normal module can be used as an approximation.

The tool edge radius and the cutter module can be preset or automatically determined. The following methods are available for this purpose:

• User specification of module m₀ and tool edge radius ρ_a0
• Automatically determine standard cutter (recommended for cyclo-palloid): A standard cutter module m₀ is determined for the calculated mean normal module m_mn. The tool edge radius is:  ρ_a0 = 0.3 ⋅ m₀ .
• Calculation from tip clearance and slot width: The maximum tool edge radius is calculated from the tip clearance c = m_mn ⋅ (k_hfp - k_hap) and the minimum slot width, which is determined in a simplified way on the crown gear. The cutter module is set: m₀ = m_mn.