Partner in product development
With Vink System Design & Analysis I (Jaap Vink) provide engineering services to companies. I specialize in precision mechanics and am an experienced and result-oriented partner in the development of complex opto-mechanical and mechatronic systems where high accuracy is required.
To perform regular or specialist mechanical calculations and analyes, I have developed a toolkit with software programs and a spreadsheet. You can download and use these.
Spreadsheet Tolerance analysis
Calculate Beam Deflection Pro
Calculate Beam Deflection Lite
Do you want to try FlexBeam first or do you not need the more extensive functionality of FlexBeam Pro? Then download the free version FlexBeam Lite.
Calculate Hertz Contacts
With HertzWin you can quickly calculate point and line contacts. The practical, free program automatically performs all Hertzian contact calculations.
Calculate Flexure Hinges
With the free FlexHinge program, you can quickly calculate the stiffness and material stress of a flexure hinge. It performs all calculations automatically.
Setting up the tolerance chain step-by-step
In the article 'step plan tolerance analysis', the steps to achieve a good tolerance analysis are briefly summarized. In the articles that followed, the method of adding tolerances is discussed. Much attention was paid to the statistics of dimensional variations of...
Tolerance Stack-Up Analysis and Process Capability Index Cpk
Previous articles have discussed the application of statistics in tolerance analysis: how statistical addition works, how to incorporate the influence of different distributions, and combining worst-case with statistical contributions. The resulting picture is that...
Rolling Contact Fatigue
Up to and including release 3.2.0 of HertzWin, all calculated results related to a static situation. The most important material stresses for a static situation are the maximum shear stress and the Von Mises equivalent stress. Most commonly used to determine whether a...
Tangential Force Acting on a Hertzian Contact in HertzWin
With the program HertzWin you can calculate Hertz point and line contacts. The influence of a tangential force can also be calculated. HertzWin has been available online for free since March 2009. No approximation but the exact solution In older releases of HertzWin...
Refined, Advanced Tolerance Analysis
In previous articles about tolerance analysis, I discussed the step-by-step plan and the way of adding up. Adding up tolerances can be a worst-case sum or a statistical sum. In 'The distribution of tolerances' I also discussed the types of distributions that may...
Background Information of the HertzWin Calculator for Hertzian Stresses
Occasionally, contact stresses play a role in a mechanical design. Herzian stress equations are needed to calculate indentation and to check if the yield stress isn't exceeded. Because programming is a hobby of mine, it seemed like a good idea to make a Hertzian...
Toolkit: Help function sometimes not visible and blurry fonts in Windows 10
Fix the issue with non-visible contents of the help function and fix the issue with blurry fonts under Windows 10.
The Distribution of Tolerances
In a previous article the statistical tolerance stack-up analysis is discussed. It is usually profitable to do a statistical tolerance stack-up analysis instead of a worst-case analysis. A worst-case analysis often leads to low tolerance specifications and therefore...
Statistical Tolerance Stack-up Analysis
In the article Worst-case Tolerance Stack-up Analysis you read about the worst-case or linear stack-up analysis. Such an analysis assumes that all dimensions in the tolerance chain have worst-case deviations form their nominal value. A statistical tolerance stack-up...
Worst-case Tolerance Stack-up Analysis
Suppose that you went through your tolerance analysis step plan and made a tolerance chain. The only thing to do now is to add up all tolerances. This seems easy enough but there are a few questions to consider: What to do with asymmetrical tolerances? Do you perform...
Tolerance Stack-up Analysis
Tolerances become important as soon as you design an assembly of parts. Of course each dimension must be provided with a tolerance. But in an assembly the tolerances become important because all parts must fit. In this article I tacitly will assume that we are dealing...
Flexure hinges: theory and practice
The flexure hinge is a tried and tested construction element in precision engineering systems. It is created by drilling or spark erosion of two adjacent holes. The positive properties of flexure hinges, free of play and friction, are partly undone by the limited...