![]() ![]() In the next image a blend is made between the new curve on the outer surface of the pipe and the wanted top edge of the pipe:Ī new splitting is done along the new blended surface and the upper slice is removed: The pipe is split by the blue plane to generate another curve around the pipe. In the next image the blue line is extruded to a plane: The blue line is drawn between the points where the red lines cross the outer surface of the pipe. They are actually tilted 16 degrees from the horizontal to make a well visible difference to the angle-cut pipe end also in the left. The red lines show the wanted chamfered surface directions at the opposite edges of the cross-section. ![]() I proceed with a half of the pipe, because the result can be mirrored and united. The starting point is the cross-section of the pipe. Here's another approach (also blending and splitting with the blending result) which seems to give better accuracy without numerous intermediate steps To make the error smaller one can insert intermediate lines as many as he likes, but this blending idea doesn't lead to an exact result, not at least in this program. ![]() Worse: Cutting the pipe and measuring revealed that more intermediate lines are needed for less than 1 degree error. I have no idea what makes just this (tricky) chamfer good.ĪDD after a comment The questioned asked how I guarantee that the chamfering result is 15 degrees tilted from the horizontal everywhere, not only at the rotated lines which are blended to a surface? I must admit I cannot prove it, the result looks right only visually. Here's the used blending under construction:Īnd this is the chamfered pipe end completed:īTW. Here's the cutting result - only half a turn done, the orange (=selected) surface is the original tilted pipe end for a comparison: Or instead of cutting extrude the blending result and subtract. The edge of the pipe end is the blending path. but I can show one idea:Ĭut with a surface which is a blend between 2 lines which both are tilted 15 degrees from the horizontal. Sorry, no Inventor available here, I use freeware. Is there another way of generating this chamfer or removal? I just forgot, I also tried a helix (coil) cut, but the path of the helix is not the same as the angled cut through the pipe. I even added a rail of the inside edge which improved things but still had problems. The resulting shape did not follow the radius of the pipe when viewed on end. I made 4 sketches, one at each quadrant, and selected closed loop. Sweep has some serious issues relative to the desired output. The blue line is the 15 degree from horizontal line from the sketch at the low end. It was as if the triangle did not remain in its original horizontal position but got twist as it followed the path. However the resulting cut from that was not good at all. Then I thought about using the sweep tool and selecting the inside edge and tip of the triangle. I initially was going to revolve it, but that does not work as the path it need to follow is not circular. I also tried creating triangle to cut out the required shape. Since the 15 degree angle is relative to the horizontal plane, the depth along the side of the pipe also varies. The problem is the width of the top face varies ever so slightly due to the angled cut through the piped. The tool requires either fixed distance on both faces or a fixed distance on one face and an angle from that face. I tried applying a chamfer using the tool which was probably the closest result I got but it had a problem. The problem is the last and final step of applying a 15 degree chamfer to top face of the pipe. I then applied a 6 mm fillet to the inside edge of the added plate and pipe, followed by an 10 mm fillet to the outside edge. The section a bounding box the extrude and remove material from the lower pipe that does not belong. The first to be essentially a plate to be extruded into the remaining pipe. I then proceeded to create a work plane on the face of the lower cut and proceed to added two shapes. I followed this up by extruding triangles at the top and bottom to generate the angled cuts. I then revolved the large rectangle on the right side to generate a section straight pipe. I started out by drawing up the section on the left in a 2D sketch and then added some cutting shapes. I know how I attempted to model this piece but I am not sure on the proper way to model this. Therefore there is no original designer/engineer I could got to for clarification. The part above is from 1944 V2 plans which I am using as real world practice examples to teach myself 3D modeling using Inventor LT 2021. ![]()
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