Here is a sheetmetal that will be formed in two directions. I need to get a flat pattern of this and of course Inventor will not flatten it.
Could someone with Autopol help me out with this?
Thanks a million.
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i can offer this, I have flattened this in another cad package for you and created a dxf. you need to check it as i am unsure if it is spot on.
the outer edge circumference is the same as the model?
let me know if it is good for you,
I looked at your file. I think the outer radius of the flat should be around 147.5in (3746.5mm). Your flat dxf measures around 10780mm for the radius. Not exactly sure why there is so much difference there.
I am not sure what the radius of id would be for the flat.
Is the dxf you provided in mm?
Thanks for the help.
It is a scaling issue, I didn't look at the dimensions at all, I work in mm.
basically I took your internal surface which was made up of two surfaces, I then created a single surface and exported it.
then did the flatten process and exported as a dxf. I have now scaled it up to meet your dimension.
Please note: I am not sure how good this is, you need to check! this is a facility I don't use very often and normaly on very small parts which are hand formed so tweaking is easier with a grinder if required
the problem with a double curvature is the stretching / shrinking of the material to form the curve this is a guestimate
I hop this helps, let me know how it goes.
I checked the radius of your part at the top and the bottom. I think we are close now on the radius dimensions. This segment will be used to make a full 360° part. It will look like this when its finished (hopefully).
As another check, I checked the included angle between the sides. I know that the part will deform some because of the stretching, but I thought the sides should be "close" to about 30° (maybe less to allow for stretching as its formed). When I measure the flat it is about 18°. I don't know if it will stretch enough to form the 30° that we need.
the dxf is lots of very small lines, this is how it exported, I would normally smooth this out as it plays havoc with other processes. however because they are so small and the curves on the sides are changing the little lines may be giving you the wrong info.
I find the best way to check something like this is to draw a bigger line over the small ones so that it still follows the intended shape (or use arcs which will be smoother but harder to dimension the angle with). I added two lines and dimensioned in the same place as you and got 25 degrees on the angle and as you move along the shape edge this angle changes to suit.
I think it is closer than you think.
perhaps you should test it out by scaling it down and cutting it into cheaper materials like card?
I got the 18° by drawing a line from the front corner to the back corner and then measuring the angle. I was just getting an idea of what the angle would be like. I got the 25° like you when I sketched in a line from the corner and then followed the general slope of the curve. It might just be close enough to work. Just depends on how much the material stretches.
We will definetly test with some thinner material. It might be a while before we get this completed cause we have to build a die to do this. Will let you know how it goes.
Thanks for the help.
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