Table of Contents
How is hole tolerance measured?
Dial or digital calipers used to measure the hole for a two point variable(s) data measurement on “thin” parts. If they display a value higher than LMC when inserted and applied properly, the hole is out of tolerance.
What is 2D tolerance stack up analysis?
In a 2D tolerance stackup problem, the distance being analyzed and all dimensions that contribute to the variation of that distance are represented in a single plane. In a 3D tolerance stackup problem, dimensions can contribute to the variation in any direction.
How is stack tolerance calculated?
Step 1 : Identify the requirement that is to be analyzed. Step 2 : Identify all dimensions and tolerances that contribute to the gap. Step 3 : Assign each dimension a positive or negative value: Up is positive Down is negative.
What is stack up tolerance?
What is tolerance stacking or stack-up? Tolerance stack-up is the process of adding tolerances together before manufacturing in order to understand their cumulative effect on part production.
What is bilateral tolerance?
Bilateral tolerance is the term used when the tolerance zone is distributed from the target value or true profile in both directions. Bilateral tolerances allow equal variation on each side of the target.
Why We Do tolerance stack up?
The idea of tolerances “stacking up” would refer to adding tolerances to find total part tolerance, then comparing that to the available gap or performance limits in order to see if the design will work properly. This simple comparison is also referred to as worst case analysis.
What is unilateral and bilateral tolerance?
Key Take-Aways. Bilateral profile tolerance means variation from the true profile is permitted in equally in both directions. Unequally disposed profile tolerance means that more variation from the true profile is permitted in one direction than the other.
What is the tolerance of position on a hole?
The tolerance of position limits the amount that the hole can tilt. When the hole is at its smallest ( MMC) allowable size, the hole is allowed to tilt a little bit and the post can still fit in the hole. When the hole is at its largest ( LMC) allowable size, the hole can tilt more and the post still fits in the hole.
What is the bonus tolerance of a hole?
For any given hole, the bonus tolerance is equal to the actual size of the hole minus the smallest size of the hole. The maximum bonus tolerance allowed is when the hole is at its largest allowable size.
What is the difference between size tolerance and bonus tolerance?
For any given hole, the bonus tolerance is equal to the actual size of the hole minus the smallest size of the hole. The maximum bonus tolerance allowed is when the hole is at its largest allowable size. Therefore the maximum bonus tolerance allowed is always equal to the size tolerance.
What is the total tolerance zone diameter at Hole [C]?
So our total tolerance zone diameter at hole [C] is the tolerance of position value of 0.15 plus the bonus tolerance of 0.1 plus the datum feature shift of 0.2 for a total tolerance zone diameter of 0.45. Once again remember to also check to make sure the diameter of the hole meets the size requirement.