Use and do not use the threaded hole reamer reamer, what do you mean, how to choose the aperture

Answer:

Use and do not use the threaded hole reamer reamer, refers to the different machining method of taper thread hole at. Machining taper thread hole, if you do not use the reamer, only in accordance with the minimum size of the taper thread bottom hole drill hole, then taper tap directly using reamer tapping; machining taper threaded hole machining taper thread hole, or the first in accordance with the small size of taper threaded hole drilled outlet, and then use the taper reamer with taper to wring then, the taper taps, so machining taper thread holes, cutting the amount of tap is smaller than the cutting amount without taper reamer reaming tapping more tapping is also easier.

Because the drill hole drilling accuracy is not high, the hole is rough, and the internal hole accuracy requirements are relatively high, reaming can improve the accuracy of the hole and the surface roughness of the hole.When machining threads, the drilling diameter is approximately the nominal diameter of the thread minus the pitch of the thread.

Thread hole processing technology is generally drilling, and then tapping. Refers to the bottom hole diameter. For example, M10*1.5 ordinary coarse thread screw, the bottom diameter is Phi 8.37 internal thread processing, to the processing of a hole, the hole diameter than the nominal diameter of the small number of threads, the hole is threaded hole. The common thread bottom hole diameter can search the Internet access to "form" the threaded hole diameter, different hole size tolerance zone is slightly different.The empirical formula: ordinary screw diameter =d- (1 ~ 1.1) P type, D - P - pitch diameter of screw. If the thread M10, pitch 1.5mm, calculated by the empirical formula, the bottom diameter of =10- (1 ~ 1.1) * 1.5=8.35 ~ 8.5, 8.4 bits to drill on the line. Processing of general internal thread diameter underport metric - thread path is what. Refers to the bottom hole diameter