Bonus Tolerance on PC-DMIS - How is it calculated ?

​Calculation of dependent tolerances (calculation of the Bonus parameter -
increments of the positional tolerance field due to the diameter tolerance)
When calculating positional deviations, both controlled and to basic
elements can be subject to the following conditions:
- Regardless of Feature Size (RFS) - independent positional deviation
- Maximum Material Condition (MMC) - dependent positional deviation
subject to maximum material reserve
- Least Material Condition (LMC) - dependent positional deviation at
minimum material reserve condition
In the case of a hole, the MMC condition means that the calculation of the increment
positional tolerance field (due to diameter tolerance) comes from
minimum allowable diameter value (lower limit
deviation) in the direction of its increase (within tolerance). In other words,
the greater the difference between the actual hole diameter and its
the smallest limit value, the more the field will increase
positional tolerance for the center of the hole (i.e. the
collection).
In the case of a shaft, on the contrary, the MMC condition means that the calculation of the value
positional tolerance field increments (due to diameter tolerance)
comes from the maximum allowable diameter value (upper
maximum deviation) in the direction of its decrease (within tolerance). Those.
the greater the difference between the actual shaft diameter and its largest
limit value, the more the positional tolerance field will increase for
the center of the shaft (i.e., the collection will improve accordingly).
The LMC condition means, in the case of a hole, that the calculation of the increment
positional tolerance field (due to diameter tolerance) comes from
the maximum allowable diameter value (upper limit
deviation) in the direction of its decrease (within tolerance). In the case of a shaft
the LMC condition means that the calculation of the magnitude of the increment of the positional field
tolerance (due to diameter tolerance) is derived from the minimum allowable
diameter value (lower limit deviation) in the direction of its
magnification (within tolerance). Calculation of positional deviations under the condition
LMC is rarely used in practice (in cases where especially
it is important to maintain a reserve of material, for example, when working with
thin parts).​

​Calculation of dependent tolerances (calculation of the Bonus parameter -
increments of the positional tolerance field due to the diameter tolerance)
When calculating positional deviations, both controlled and to basic
elements can be subject to the following conditions:
- Regardless of Feature Size (RFS) - independent positional deviation
- Maximum Material Condition (MMC) - dependent positional deviation
subject to maximum material reserve
- Least Material Condition (LMC) - dependent positional deviation at
minimum material reserve condition
In the case of a hole, the MMC condition means that the calculation of the increment
positional tolerance field (due to diameter tolerance) comes from
minimum allowable diameter value (lower limit
deviation) in the direction of its increase (within tolerance). In other words,
the greater the difference between the actual hole diameter and its
the smallest limit value, the more the field will increase
positional tolerance for the center of the hole (i.e. the
collection).
In the case of a shaft, on the contrary, the MMC condition means that the calculation of the value
positional tolerance field increments (due to diameter tolerance)
comes from the maximum allowable diameter value (upper
maximum deviation) in the direction of its decrease (within tolerance). Those.
the greater the difference between the actual shaft diameter and its largest
limit value, the more the positional tolerance field will increase for
the center of the shaft (i.e., the collection will improve accordingly).
The LMC condition means, in the case of a hole, that the calculation of the increment
positional tolerance field (due to diameter tolerance) comes from
the maximum allowable diameter value (upper limit
deviation) in the direction of its decrease (within tolerance). In the case of a shaft
the LMC condition means that the calculation of the magnitude of the increment of the positional field
tolerance (due to diameter tolerance) is derived from the minimum allowable
diameter value (lower limit deviation) in the direction of its
magnification (within tolerance). Calculation of positional deviations under the condition
LMC is rarely used in practice (in cases where especially
it is important to maintain a reserve of material, for example, when working with
thin parts).​