A pretravel model for horizontally-oriented touch trigger probe is described in this paper. A trigger force model based on the principle of mechanics is derived and used to develop the pretravel model, and the model accounts for bending deflection of the stylus shaft at the trigger instant. Pretravel is modeled as a function of probe design parameters (such as stylus length, tripod leg length, and stylus material), probe operating parameters (such as spring force setting and probe approach direction), and the weight of the stylus shaft. In applying the model to predict probe pretravel, only one model parameter needs to be calculated from 48 points of experimental probe data. The model is robust and can be implemented by means of a software correction module which can be incorporated into machine systems.
| Number of Pages : | 6 |
| Published : | 06/01/1996 |
