The true position calculator takes material condition, distance from datum b, distance from datum c, distance from datum b, distance from datum c, position tolerance (diametrical), bore diameter, bore diameter, tolerance (-), tolerance (+), one way and if else and returns bonus tolerance due to mmc, tolerance excess and total tolerance. It is built for quick answers, for checking somebody else’s arithmetic, and for the moments when a formula book is not within reach.
What Is the True Position Calculator?
The true position calculator turns material condition, distance from datum b, distance from datum c, distance from datum b, distance from datum c, position tolerance (diametrical), bore diameter, bore diameter, tolerance (-), tolerance (+), one way and if else into bonus tolerance due to mmc, tolerance excess and total tolerance, so you can order the right amount of material the first time.
Material estimates are where projects go over budget. Getting the quantities right before the delivery arrives is worth more than any discount on the order.
How to Measure for the True Position
Measure everything in the same unit and take the largest dimension you can reasonably use rather than the average. Formwork, ground conditions and cutting waste all push the real figure above the theoretical one.
Where a plan calls for a specific thickness, check it against local building regulations before you order. The calculator reflects the relationship, not the code.
Allowing for Waste and Errors
Order a little more than the calculation suggests. The gap between the theoretical quantity and what actually arrives on site is normally waste, spillage, over-excavation and uneven grading, and all of it comes out of the same budget.
Write the figures down and compare them with what you actually used on site. That is how you build an estimate you can trust for the next job.
A Worked Example
Working through an example, with material condition set to 1, distance from datum b set to 10, distance from datum c set to 5, the calculator returns size max of 15, and size min of -95, and offset from datum b of 8. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out bonus tolerance due to mmc?
Enter material condition, distance from datum b, distance from datum c, distance from datum b, distance from datum c, position tolerance (diametrical), bore diameter, bore diameter, tolerance (-), tolerance (+), one way and if else. The calculator then works through the relationship and reports bonus tolerance due to mmc, tolerance excess and total tolerance.
What does the true position actually calculate?
It takes material condition, distance from datum b, distance from datum c, distance from datum b, distance from datum c, position tolerance (diametrical), bore diameter, bore diameter, tolerance (-), tolerance (+), one way and if else and converts them into bonus tolerance due to mmc, tolerance excess and total tolerance using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter material condition?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.