Standard Fits
Standard Fits are a way of specifying a fit between a hole and a shaft. RC 1-9 Running or Sliding Clearance Fit LC 1-11 Locational Clearance Fit LT 1-6 Transition Clearance or Interference Fit LN 1-3 Locational Interference Fit FN 1-5 Force or Shrink Fit We mention this here because it will be useful in dimension the parts of your yo-yo that must snap fit together. Ref Marks' Mechanical Engineering Handbook, 6th ed. McGraw-Hill.
Most complicated part of the drawing There is more to it than just the
Showing that placement should match intent These drawings show bolts holes for mounting a flange onto a plate. When mounting the flange, the position of the holes with respect to each other is very important, or else the flange or part won't fit. It makes sense to dimension the distance between the holes, instead of the distances to the edge.
The ANSI Y or the ISO standard
The ANSI standards must be understood to read a drawing. Lets look at a sample drawing 1 1 1 Laboratory for Manufacturing and Productivity 1 Massachusetts Institute of Technology Basic Information Included in a Drawing Projected Views Show as many sides as needed for completeness. Cross Sections A view that is good for showing interior features. Table Lower right corner, with material information, part name, designer etc.
Circularity Roundness Example
Each circular element of the surface in a plane perpendicular to an axis must lie between two concentric circles, one having a radius 0.25 larger than the other. Each circular element of the surface must be within the specified limits of size.
Tolerance Zone Size
This feature control frame specifies the tolerance zone as a circle of diameter .010 at MMC, centered according to the basic dimensions given. The size of the tolerance zone is dependent on the size of the hole. A feature control frame can specify the size of the tolerance zone at MMC, LMC or RFS regardless of feature size . MMC of hole .250 LMC of hole .255 Does this feature meet the true position tolerance Calculate deviations in x and y directions. How does this compare to the basic...
Circular Total Runout
Runout is specified on cylindrical parts. It is measured by placing a gage on the part, and rotating the part through 360 degrees. The total variation is recorded as the runout. Circular runout is measured at one location. Total Runout is measured along the entire specified surface. Measuring angularity is equivalent to measuring parallelism at an angle. Conventional Coordinate Tolerancing In the conventional tolerancing scheme, a hole center axis can reside anywhere in the square tolerance...
