The reamer H7 and H8 are of high accuracy
The difference is that the accuracy of the machining of the base hole is different in the tolerance fit. H7 has higher accuracy.Take an aperture of 10 millimeters as an example:1, H7 accuracy is, the upper limit +0.015[mm], the lower limit is 0[, processing error must be between +0.015 and 0.];2, H8 accuracy is, the upper limit +0.022[mm], the lower limit is 0[, processing error must be between +0.022 and 0.].
The H7 of the reamer is higher than the reamer H8, and the accuracy of the reamer is D4, H7, H8, H9 and so on;Their difference: the deviation is different; the structure of the reamer is mostly composed of the work part and the handle part. The main part of the work is cutting and calibration functions, the calibration Department has inverted taper diameter. The shank is used for clamping by the clamp and has a straight handle and a taper handle.A rotary tool with one or more cutter teeth used to remove thin metal on the surface of a machined hole; a rotary finishing tool having a straight or spiral blade; used for reaming or trimming. A rotary finishing tool having a straight edge or a spiral edge; used for broaching or trimming holes. The cutting accuracy is usually higher than that of the drill because of the small amount of cutting. Can be operated manually or installed on a drilling machine.
