irTibo
Mechanical
- Oct 22, 2008
- 2
The ANSI B92.2M spline standard has formulas for total index variation, total profile variation, and lead variation for the spline tolerance classes 4-7. I am looking to expand past the standard for other tolerance classes. In particular, classes 0-18. The lead variation formula is the only regression I can't figure out. The formula (in micrometers) in the standard is as follows:
Class 4 0.8 * sqrt(g) + 4
Class 5 1.0 * sqrt(g) + 5
Class 6 1.25 * sqrt(g) + 6.3
Class 7 2.0 * sqrt(g) + 10
where g is the spline length in mm
The standard also states, "The lead variation is a standard tolerance grade selection from ISO 1328." I have not been able to understand its relevance to the formula, but I thought it might be of importance to mention. I also have not cross referenced this with ISO 4156 yet, as I currently do not have a copy.
I know this is an unusual question, but if anyone likes a puzzle, I'd appreciate the help in figuring out the formulas for other classes.
Class 4 0.8 * sqrt(g) + 4
Class 5 1.0 * sqrt(g) + 5
Class 6 1.25 * sqrt(g) + 6.3
Class 7 2.0 * sqrt(g) + 10
where g is the spline length in mm
The standard also states, "The lead variation is a standard tolerance grade selection from ISO 1328." I have not been able to understand its relevance to the formula, but I thought it might be of importance to mention. I also have not cross referenced this with ISO 4156 yet, as I currently do not have a copy.
I know this is an unusual question, but if anyone likes a puzzle, I'd appreciate the help in figuring out the formulas for other classes.