Essentially the profilograph is a trolley with wheels at the front and back separated by 600mm and a jockey wheel between these wheels which moves up and down as the floor changes. Instruments accurately measure this change in height and a graph is produced showing how much of the floor is in tolerance.
ANSI limits and fits calculator works in line with ANSI B4.1 standard which is based on inch units. According to nominal size and fit type selection among running and sliding [RC], locational clearance [LC], locational transition [LT], locational interference [LN], force and shrink [FN] fits, size limits for hole/shaft are calculated with schematic representation of the fit.
1) Values for standard tolerance grades IT01 and IT0 for basic sizes less than or equal to 500 mm are given in IS0 286-1, annex A, table 5. 2) Values for standard tolerance grades IT1 to IT5 (incl.) for basic sizes over 500 mm are included for experimental use.
International Tolerance (IT) Grades Table Chart | Engineers Edge
Overweight by 10% and your OK with VOSA? - TruckNet UK
Tolerance is the total variance in a dimension which is the difference between the upper and lower limits. The tolerance of the slot in Figure 14.50 is .004" and the tolerance of the mating part is .002".
Tolerance limit, T 1 The nominal quantity minus the tolerable negative error, i.e. T 1 = Q n - TNE Absolute tolerance limit, T 2 The nominal quantity minus twice the tolerable negative error, i.e. T 2 = Q n 2*TNE Non-standard package A package whose contents are less than the tolerance limit, T 1
OUR GUIDE TO CALIBRATION WEIGHTS - Blake and Boughton