Bend deduction table
I haven't used bend tables, but I think the online help should get you started.
http://help.autodesk.com/view/INVNTOR/2019/ENU/?guid=GUID-27FD9757-5B40-4528-B361-D9BDFDB2EA4D
Post back here if you have any questions about how these work.
Steve Walton
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Inventor 2025
Vault Professional 2025
Hi! It is not that hard. You do need to set up once. But, after that, you can reuse the rule. Inventor actually ships with two example Bend Tables (C:\Users\Public\Documents\Autodesk\Inventor 20xx\Design Data\Bend Tables). You can start a new sheet metal part.
1) Go to Manage -> Styles Editor -> Sheet Metal Unfold Rules -> create a new rule -> set it to Bend Table type.
2) Open the example bend table in Excel or any table editor. You will see a bunch of bend tables. The table is thickness specific. You need to specify the thickness value. The copy the table and paste it to the rule table. Make sure you delete the line ";opening angle ----."
3) Repeat the process for other thickness values.
Many thanks!
Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer
Hello,
Could you explain me how correction works, becouse it seems wrong.
I tried table from you explanation. Just make 49x50mm and 45° and when I measure, it is always wrong.
I used table from insatalation: C:\Users\Public\Documents\Autodesk\Inventor 2024\Design Data\Bend Tables
Where correction for 45° is - 0,439021
From formula there: L=A+B-x it should be 98,560 for radius 0,5 mm
But is wrong after unfold: - 99,380 mm --- Totally wrong!!!
It seems that table do not work.!
I do not understand your advice. I do not measure any radisu, I though that it will be that correction after unfold.
@david.karoly I don't understand what you mean at all.
The bending table is a manual tool.
Both the bend table and the K-factor are elements of the same equation from two different sides. The K factor multiplies the radii and the table calculates the difference in values. The end result is the same - finding the nominal length for the neutral axis (plane).
The main difference (besides the mathematical formula) is the workflow of these tools.
In the case of the K coefficient, we are dealing with multiplication, so once the parameter is defined, it is used to calculate all value variants.
In the case of a table it is similar - but you have to prepare a whole series of samples, because... there is no multiplication; is direct correction. Therefore, you should prepare as many samples (different variants) as you can, and then complete the table. The remaining (intermediate) positions will be calculated interpolationally.
This is exactly what the bend table workflow looks like:
- You bend 10 details (same radius, different angle)
- You count the differences
- You fill in the cells
- You work and design - You use the table even with undefined values, counting on the correct accuracy of the calculated interpolations.
And so for each radius xD.
This is the only way, because the bending table is a manual tool.
You have to work through it. Prepare samples, measure, calculate and complete the table. And so for each thickness, radius, angle and technology (k-factor). Then it will work your way.
You cannot expect the table to be correct right away - it is not adapted to your technology and material (i.e. it is calculated for a different K-factor).
This is your task - you must complete the table; then it will be correct. And you will be able to use it.
Expecting top-down bending table compliance shows a misunderstanding of this tool and process.
Kacper Suchomski
YouTube - Inventor tutorials | LinkedIn | Instagram
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That table is from Instalation Inventor: C:\Users\Public\Documents\Autodesk\Inventor 2024\Design Data\Bend Tables
There is table for t=0,5 mm and few radius and angles.
That I tried, I want to see how it will work but I see I do not understant anyway. Becouse if I triend to measure outside as you told me.
Like this should I measure?
A+B -x =...
it is till do not work 😄
And in the sheet metal settings, did you choose to use the bending table or the K factor? Because this is probably the answer to your worries.
Kacper Suchomski
YouTube - Inventor tutorials | LinkedIn | Instagram
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And here you will find instructions on how to edit the table.
https://help.autodesk.com/view/INVNTOR/2024/ENU/?guid=GUID-48045F68-14D4-4861-9200-50EE59913FD4
Kacper Suchomski
YouTube - Inventor tutorials | LinkedIn | Instagram
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Of course. If you mean here.
I tried put into table very easy values like 0,5 mm and then check it and it is anyway wrong. Try it yourself, becouse I think it is not work correctly.
You can try very simple example:
i make table for t=0,5 mm and raidus 30° it will be x=0,5
Then sheet metal 50x49 mm
Where I see result 99,036 mm what makes no sense.
