The maximum clearance of a setting is the difference between the actual maximum value of a female dimension and the actual minimum value of a male dimension, while the minimum clearance is a similar concept except that instead of taking the maximum values ​​it takes the minimum ones.

The minimum clearance value in sliding and rotating loose fits is always greater than zero; On the contrary, the maximum and minimum clearance in a forced fit is always negative.

When making an adjustment, certain parameters must be taken into consideration in order to achieve the desired quality. One of them is the roughness "Roughness (mechanical)"), which is the set of ridges and grooves that are formed on the surface "Surface (physical)") of a part that was machined due to the action of cutting tools. Roughness is related to tolerances and quality of fits.[7]​.

Other parameters to be determined in certain components are parallelism "Parallelism (mathematics)") and perpendicularity between a faced cylindrical surface and its axial axis, for which the permitted limits are indicated in the construction plans. In certain cylindrical components, the roundness, taper and in general the spherical profile must be controlled, while in other types of parts it is necessary to check the flatness or horizontality of the surface or the concentricity if there are several parts with diameters that have a common axis.

Accuracy will not always be necessary since for the adjustment it always comes out with an error of 0.001.

When producing parts in series, it is necessary to verify that they have the appropriate quality so that components do not have to be discarded at the end of the process because they do not fit when assembling the machines. That is why companies implement quality control departments that carry out measurements and verifications of the parts to guarantee that the quality is adequate or stop production if errors are found in the process. Before starting serial production, the machine tool receives an appropriate calibration according to the machining operation to be carried out. After the first piece is made, it receives a rigorous control of all the quality parameters involved. If the result is positive, the quality control of the process is carried out by the machine operator, for which he must have the necessary measuring instruments, gauges and calipers "Caliber (instrument)").

In order to verify the precision of the parts, measuring instruments are used such as calipers or Vernier, micrometers "Micrometer (instrument)"), gauges "Gramil (tool)"), dial gauges, buffer gauges (pass-fail) to verify holes and horseshoe gauges (pass-fail) to verify outside diameters.

The buffer gauge has two machined ends of different lengths. The longest cylinder is the PASA. The dimensions of the PASS cylinder correspond to the actual minimum dimension of the nominal dimension, and the short cylinder corresponds to the NO PASS side and has the dimension corresponding to the largest diameter of the corresponding nominal dimension. For its part, in the horseshoe to verify external diameters, the openings are related inversely to the previous caliber.

There are two types of specialties of mechanical fitter technicians: the die fitter and the mechanical fitter fitter. The die fitter is one who builds complex mechanical elements, precision fits, molds and dies using both hand tools and machines. You should also verify parts, manufacturing processes, and product quality.[8]​.

The maximum clearance of a setting is the difference between the actual maximum value of a female dimension and the actual minimum value of a male dimension, while the minimum clearance is a similar concept except that instead of taking the maximum values ​​it takes the minimum ones.

The minimum clearance value in sliding and rotating loose fits is always greater than zero; On the contrary, the maximum and minimum clearance in a forced fit is always negative.

When making an adjustment, certain parameters must be taken into consideration in order to achieve the desired quality. One of them is the roughness "Roughness (mechanical)"), which is the set of ridges and grooves that are formed on the surface "Surface (physical)") of a part that was machined due to the action of cutting tools. Roughness is related to tolerances and quality of fits.[7]​.

Other parameters to be determined in certain components are parallelism "Parallelism (mathematics)") and perpendicularity between a faced cylindrical surface and its axial axis, for which the permitted limits are indicated in the construction plans. In certain cylindrical components, the roundness, taper and in general the spherical profile must be controlled, while in other types of parts it is necessary to check the flatness or horizontality of the surface or the concentricity if there are several parts with diameters that have a common axis.

Accuracy will not always be necessary since for the adjustment it always comes out with an error of 0.001.

When producing parts in series, it is necessary to verify that they have the appropriate quality so that components do not have to be discarded at the end of the process because they do not fit when assembling the machines. That is why companies implement quality control departments that carry out measurements and verifications of the parts to guarantee that the quality is adequate or stop production if errors are found in the process. Before starting serial production, the machine tool receives an appropriate calibration according to the machining operation to be carried out. After the first piece is made, it receives a rigorous control of all the quality parameters involved. If the result is positive, the quality control of the process is carried out by the machine operator, for which he must have the necessary measuring instruments, gauges and calipers "Caliber (instrument)").

In order to verify the precision of the parts, measuring instruments are used such as calipers or Vernier, micrometers "Micrometer (instrument)"), gauges "Gramil (tool)"), dial gauges, buffer gauges (pass-fail) to verify holes and horseshoe gauges (pass-fail) to verify outside diameters.

The buffer gauge has two machined ends of different lengths. The longest cylinder is the PASA. The dimensions of the PASS cylinder correspond to the actual minimum dimension of the nominal dimension, and the short cylinder corresponds to the NO PASS side and has the dimension corresponding to the largest diameter of the corresponding nominal dimension. For its part, in the horseshoe to verify external diameters, the openings are related inversely to the previous caliber.

There are two types of specialties of mechanical fitter technicians: the die fitter and the mechanical fitter fitter. The die fitter is one who builds complex mechanical elements, precision fits, molds and dies using both hand tools and machines. You should also verify parts, manufacturing processes, and product quality.[8]​.