AVT 206 A&P - The Math Behind the Bends - Example 1 Math and Fabrication
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- Опубліковано 5 бер 2018
- WARNING - I made a dyslexic error when copying the formula. I left out a 7. The formula SHOULD read BA(deg)=(0.0078MT+0.01743BR)xdeg. This error affects all 5 of the non-90 videos I made. I will have to re-shoot. In the meantime, I will flag the error to make sure no one is harmed! - WARNING
Intended for FAA aircraft mechanic training, this is a classroom style example that shows how to lay apply the formulas developed in previous videos and to create the developed blank ready to cut and fold. No special effects, smoke, or mirrors - just crunching the numbers,. This is Example 3 of 4. When a non-90 angle is needed, the setback is calculated using the tangent function on your calculator or a K-value table. The BA is also calculated per degree instead of per 1/4 circle. - Комедії
I have my O&P this Saturday and this was a great review. Thanks !!!
Useful. Thanks a lot. Worth a million likes
Thanks sir for these valuable informations
What are the thicknesses of shims you use to increase the radius? In other words, which thickness of shims causes how much radius increase?
Will this formulas also work for multiple bends ? For example return bends or hems ?
Thank u.
How did you figure out bend radius and bend alowance?
Thank you very much sir. God blessed you
hi! I am form India. Here we use K factor (K= distance b/w neutral axis inside surface of sheet/ material thickness, which is constant for diff. metals) to calculate bend allowance which gives formula BA= (pie theta/180)x(bend radius+ K x material thickness).
why is your approach diff. from what I have learned?
Where are these numbers coming from for the bend allowance formula?this video you have ba=.702+mt + 1.57 +br. And the non 90 you ba= .0078+mt + .0143+ br. Why is one .702 and the other .0078 i don’t get it.
One is for 90 degrees, the other is multiplied per degree. 0.0078 x 90 degrees is 0.702.
why not mention the bend allowance chart?
Because the chart is old technology. Now we have calculators. But if you prefer the chart, you can certainly still use it.
In the non-90 degree video I missed what (k) represented
I guess he said Tangent
When the FAA talks about "k," it represents the trigonometry based adjustment to the setback (its the tangent of 1/2 of the bend angle). When most non-aircraft sheet metal mechanics talk about "k," they use it to represent the percentage on the material thickness of the neutral axis. Unfortunately, these two different uses of "k" do not help people understand the process.