Some common readily available DP cutter sizes are 24DP, 32DP, 48DP etc. ![]() For example, in this case if a Involute tooth form is required, tooth form sizes are designated in diametral pitch or D.P. As part of those calculations, the pitch circle is used either from measurement of an existing gear or desired size of a new gear. Part of the class covers calculations if one wishes to purchase a commercial cutter for reproducing an existing gear or new gear. The point at which the two teeth make contact is called the pitch circle that is commonly mid tooth or close on a standard tooth form. The illustration shown in Teaclocks post shows two Involute gears engaging each other. Will try to explain as I understand your questions. Depthing (center to center wheel spacing) of a completed replacement wheel or pinion remains the same as the original or it is determined by depthing procedure for new construction. Since the cutters are designed to duplicate existing tooth forms, only measurements are used. ![]() While exact measurements are not an issue as covered in class, slight plus or minus errors will not change the outcome since you will have no choice but to take the closest size available.įor the construction of single point cutters as covered in the course, tooth form calculations are not used. For purposes of the course, pitch diameter is only utilized for Diametral Pitch or Module sizing calculations if ordering commercial cutters. ![]() While each cutter manufacturer has their own interpretation of what any particular tooth form should be, the pitch diameter will vary slightly depending on designed tooth depth and tooth contact point. If so, there will be no plus or minus required if performing the single point cutter procedure described in the text.Īs he mentioned, David Morrow is describing his experience when taking the NAWCC Wheel and pinion cutting workshop WS- 119. I assume you are asking about the pitch diameter.
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