Abstract
This report introduces results of experimental relief-grinding of worm hob. The objective of this experiment is to prove that the numerical method discussed in the previous report is effective in determining the axial profile of relieving wheel. The worm hob, corresponding to a ground worm of module 4. 13, is investigated. By means of the numerical method, the profile of relieving wheel is determined. The relieving wheel is dressed by using an experimental NC-dresser and the profileerror of the dressed wheel is shown to be less than 4 μm. The worm hob is relief-ground on an experimental relief-grinder. The profile of the relieved hob is checked and the maximum error is shown to be less than 5 μm. Lines of contact of the worm gear set, the worm wheel of which is cut by the hob, are inspected. The experimental result agrees with the calculated. The profile error of hob caused by the mis-setting of relieving wheel is discussed and the discussion proceeds to the amount of the mis-setting allowable in the reliefgrinder to which the numerical method is applied.
