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| CNC machining metals. |
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| Mecanix:
--- Quote from: Cerebus on September 12, 2020, 10:38:57 pm ---I'd like to sound a note of caution. It's very easy for someone without machining experience to take a 3D cad program and design a part that is almost impossible to manufacture, or will cost much more to manufacture than a functionally equivalent part that is designed by someone who has some insight into the machining process. --- End quote --- Nothing worse than to receive a model from cad dept having 45 degree chamfered edges and corners at the bottom of cavities :palm: My fav; non-tangent curves and/or mismatching spline tolerances & surfaces (3D), or plain and simple lack of geometric constraint references. Some solid models for mfg could indeed ruin a CAD designer overnight by the CAM engineer stitching them up in prep for machining. In most cases ending up a totally different part for 10x the price lol Your message is strong and important; its not because you are being given some cool 'pro modeling tools' for free and know how to add volume to a 2D sketch with a mouse-click that it makes you a parts & assemblies maker. Far from. The learning curve about manufacturing and processing those parts is pretty steep in all realities (3~5 years learning curve minimum, with hands-on). |
| MadTux:
45º chamfer at the bottom of a pocket is rather easy to do, if you have a (tool) grinder, just grind the end of the cutting edges to a 45° angle and proceed as normal. Much worse, people who want like 50x M2 threads in aluminum. Or difficult contours for absolutely no reason. Undercuts/deep pockets are also nice, some people probably think the cutter just comes out of nowhere and the material disappears into thin air..... |
| Mecanix:
--- Quote from: MadTux on September 12, 2020, 11:43:27 pm ---45º chamfer at the bottom of a pocket is rather easy to do, if you have a (tool) grinder, just grind the end of the cutting edges to a 45° angle and proceed as normal. --- End quote --- I'd swing this over the 5ax guys for a tilted op only if required by the engineer himself/herself (and being operational feature that is, I doubt though lol). All that to say; trust I've seen this sort of stupidity and other rather alien-world geometries a lot during the last few recent years. Particularly grown problem since F360 is free and youtube hypes the 'free-hand' CAD amateur like I've never seen before. To a point we've completely stopped taking outside jobs and phone calls from unknown people, its that bad. |
| MarkF:
--- Quote from: harps on September 12, 2020, 09:56:55 pm --- --- Quote from: MarkF on September 11, 2020, 06:46:34 pm ---Fusion360 is not free. I have been using FreeCAD for my 3D prints. It has its bugs but has been getting the job done for me. Plus lots of how-to videos. --- End quote --- hi mark. is there a hidden xyz dialogue box in freecad? When I am placing a circle in a sketch I have to use the mouse freehand. I can see the xyz pop up on the screen as I hold the mouse button down, and when i let go of the mouse button the xyz numbers vanish. no where in any tab can I then fine tune the placement. very unusual for a 3d package not to have xyz to fine tune. it must be me, surly. --- End quote --- If you select an object, you can type values in the lower left corner. For pads, fillets, chamfers, rotations, etc., you can type values usually in the left Model or Tasks tabs. This guys tutorial series helped me a lot: He also does a comparison between FreeCAD and Fusion360. |
| MarkF:
--- Quote from: sokoloff on September 11, 2020, 09:28:13 pm --- --- Quote from: harps on September 11, 2020, 08:05:38 pm ---I'm not keen to have to be connected to the internet to use the software, is that required with fusion360? --- End quote --- https://knowledge.autodesk.com/support/fusion-360/troubleshooting/caas/sfdcarticles/sfdcarticles/Unable-to-open-Fusion-360-without-internet-connection.html# You have to be connected to the internet to download and install it. You have to be connected to the internet every couple of weeks to continue using it. Just now, I was able to disconnect my internet connection and use it to design and save a very simple part just now, so for the "I'm going to do some design work on an airplane trip", it seems like it would probably work OK. I was NOT able to convert that part to an STL file for 3D printing without internet. --- End quote --- When you get to this point in FreeCAD, you need to highlight your part and then "File -> Export -> STL File" for something you can slice for a 3D-Printer as an example. (No save function to a STL file.) |
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