The distances between the two planes are checked by a gutomer, parallelity – a ruler and an indicator on a rack or a ruler and a gut.
The perpendicularity of the planes with an angle of 90 ° is checked by the frame level. Perpendicularity can be checked with a large square and probe. Level can control the parallelity of surfaces. The parallelity of the axes of the holes is checked by mandrels and a gutomer, as well as an indicator using the machine spindle. Checking methods are the same as given in the first (general) part of the course.
Dimensions are controlled during the processing process and after the end of the manufacture of the part.
The parallelity of the planes is checked using an indicator mounted on a spindle of a dank machine, and long lines installed on the verified planes. If the planes are parallel, then when the indicator moves along the lines, the readings will be the same. The difference in indicator indications indicates the non -parallelness of the planes.
The perpendicularity of the location of the planes is controlled using a square and probe. The concave surfaces is checked using a ruler and probe.
The burrs should be cleaned before control.
For the manufacture of shafts, carbon and alloy steel are used. Most shafts in mechanical engineering are made of hardening steels with carbon content 0.4- 0.5%. In the presence of carbon in the indicated amounts, you can harden the shafts during their manufacturing process (between the rough and final processing operations) to the hardness of RC 35-50 or with surface hardening with heating currents of high frequency to hardness RC 45-58.