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Author Topic: Projecting on surface advice / ideas  (Read 396 times)
sibianul
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« on: July 12, 2018, 14:43:31 pm »

Hello guys,

do you know if I can project (the projection didn't work as expected), or more appropriate to bend the polylines along the selected surface ?



* projecting along surface.jpg (38.62 KB, 872x447 - viewed 22 times.)
* projecting on surface.cb (231.54 KB - downloaded 10 times.)
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Bubba
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« Reply #1 on: July 12, 2018, 16:49:21 pm »

The polylines you want to prejest a way to long. I shortened the lines and it did OK. Since I don't know what exactly you need I only modified your file so you can see for your self.. Good luck.

* projecting on surface_SAMPLE.cb (355.69 KB - downloaded 10 times.)
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sibianul
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« Reply #2 on: July 12, 2018, 17:15:08 pm »

Maybe I didn't explain correctly, I don't know how to better tell you what I want, maybe if I will show you a few photos you will understand what I wanted to say when I wrote : "bend the polylines along the selected surface"

Those leather parts ar of an exact lenght, as is the polyline I have in my file, I need to bend those leather parts one over another on that exact shape, so I want to make some 2mm deep channels on the side of the part I need to make.


* IMG_2116.JPG (416.67 KB, 1200x900 - viewed 13 times.)

* IMG_2117.JPG (507.16 KB, 1200x900 - viewed 10 times.)

* IMG_2118.JPG (208.39 KB, 1196x500 - viewed 10 times.)
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sibianul
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« Reply #3 on: July 12, 2018, 17:18:58 pm »

Here's an gif Smiley



* ezgif.com-optimize (2).gif (998.19 KB, 600x338 - viewed 10 times.)
« Last Edit: July 12, 2018, 17:20:42 pm by sibianul » Logged
dh42
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« Reply #4 on: July 12, 2018, 18:14:14 pm »

Hello

It can be done on SolidWorks, but I don't know a way to do the same with Cambam ..

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David


* bend.jpg (103.8 KB, 1188x606 - viewed 15 times.)
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sibianul
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« Reply #5 on: July 12, 2018, 18:30:19 pm »

Thank you David, I also asked in Fusion360 forums, I think there is a way to do it with the new Sheet Tools introduces about 1 year ago, I will see how it goes.

I don't have SolidWorks, also I don;t have any experience with it. I will keep trying with the tools I have .. and let you know.
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dh42
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« Reply #6 on: July 12, 2018, 19:12:16 pm »

Hello

Done with SW from your CB profiles, then exported to STEP and joined the splines.

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David

* wrap.zip (260.02 KB - downloaded 7 times.)
* wrap_STEP.zip (82.74 KB - downloaded 8 times.)
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BR52
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« Reply #7 on: July 13, 2018, 02:09:19 am »

Hi, David

This is how the projection is done in the mesh.  Roll Eyes

   Armando


* Projecting.jpg (301.54 KB, 1920x1080 - viewed 28 times.)
« Last Edit: July 13, 2018, 02:55:13 am by BR52 » Logged
dh42
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« Reply #8 on: July 13, 2018, 03:51:12 am »

Hello

Yep, but it's a projection, not a wrap as asked by sibianul

++
David
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sibianul
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« Reply #9 on: July 13, 2018, 06:46:56 am »

Hello

Done with SW from your CB profiles, then exported to STEP and joined the splines.

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David

Thank you DAVID ! Thats exactly what I wanted, I will now try to split the model and make the MOPs to mill that part. Will post back when it's done or if I will have any other problems.
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EddyCurrent
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« Reply #10 on: July 13, 2018, 09:42:40 am »

Hello

Yep, but it's a projection, not a wrap as asked by sibianul

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David

Yes, but it looks like Armando reduced the length of the polylines to compensate for the bend.
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sibianul
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« Reply #11 on: July 13, 2018, 19:17:17 pm »

I just finished milling the part, it came out perfectly, I'm very happy with the result.

To be able to mill on the variable depth, I used the engrave function, and to have the channel width as in the initial drawing (one 3mm and one 4.2mm) I used different end mills for the engrave operation, for the 3mm width of channel, I used the 6mm end mill, and for 4.2mm channel, I used an 8mm end mill, the 0.2mm difference is not an issue on this part.

Thank you David for your help!


* MDF part 3.jpg (334.08 KB, 1000x1333 - viewed 27 times.)

* MDF part 4.jpg (384.44 KB, 1000x1333 - viewed 23 times.)

* MDF part 2.jpg (463.49 KB, 1200x1600 - viewed 18 times.)

* MDF part 1.jpg (338.85 KB, 1200x900 - viewed 20 times.)
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dh42
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« Reply #12 on: July 13, 2018, 20:17:53 pm »

Hello

And the major question is: what is the use of this object ? ...  Grin

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Yes, but it looks like Armando reduced the length of the polylines to compensate for the bend.

Yes, but not easy to calculate what must be the profile of the 2D shape so it give the right profile like if it has been bended.

++
David
« Last Edit: July 13, 2018, 20:22:40 pm by dh42 » Logged
Bubba
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« Reply #13 on: July 13, 2018, 21:49:32 pm »

Eddy, I did the same thing what Armando did in previous post in response to Sibianul. This can be done, I did very similar things with sheet metal when developing a sheet metal flat pattern and hydroform tooling for making sheet metal part for an aircraft. I still have the charts for bend substraction or allowance based on type of material and radiuses.. Of course, Catia, Solidworks and other top end programs can do all of this and more.. I still have copy of Catia V5 Rev 9(OLD) but it will not run in windows 7-10  Huh
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sibianul
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« Reply #14 on: July 14, 2018, 08:05:11 am »

David, that part I made yesterday is used to perfectly centering and glue together the 2 leather pieces. Usually they tell me to make flat blocks, for glueing together the 2 parts, but in this specific case, after they glued the parts together on a flat surface, they had some problems with the inner leather part when bending it like in my pictures (it curled I think), that piece of leather will be a bags handle, and the final shape will be a curved one, like the big MDF block I made.

My clients are usually big brands, that charge hundreds or more than 1k Euro for a single leather bag, so they need all kind of "devices" in the production process to perfectly make each part of the bags, avoiding to rely only on the worker skill, with parts like the one I made yesterday, all the leather pieces are perfectly aligned, in the next steps of the production process, the result of perfectly aligning the 2 leather parts will be noticed, because they cut those lether parts again, and they sew them, if the inner part will be just 1mm glued more to a side, that results in noticeable defect On some parts they sew the leather on automatic machines, that are programmed (like CNCs) to make an exact number of punches on a specific distance, not having the parts aligned perfectly is even more noticeable in those cases.



Bubba, I appreciate everyone's help, even the reply Armando made, but I already tried that projection function as you can see in the picture I attached in my first post. Resizing the polyline to be bended I don't think it's an option, I don't know what formulas I can use to resize that perfectly, also as you seen it's not just a radius but half the polyline is bended on a radius and another half is bended at an angled surface.
The resized polyline that Armando posted, resulted in a very different shape, it was clearly that I could not fit my leather parts in the resulted projected shape. The difference are better noticed in the bellow screenshot.


* difference between projection and warping.jpg (678.29 KB, 5056x2992 - viewed 19 times.)
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