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I'd like to get some input on ways to hold up the tubing shown. My club at school and I are building a the following frame and I'm looking for suggestions how to clamp the tubing at odd angles so I can tack and weld as accurately as possible according to the drawings.As you'll see from the pictures, there's a lot of tubing that is in various angles and I just want to be able to clamp and hold the tubing in place without guessing and just going by the notches.Green Tubing = NEWGrey Tubing = Existing (We got an existing frame from another team)
Reply:Try to make a jig to hold critical points (suspension components, etc.) then fit up the rest by hand and eye ball. Try to make any measurements using other critical points, like the front suspension, don't trust the previous chassis builder to make his perfect. Don't worry too much about the position of the actual tubes, so long as they look right you'll be okay. Try to eliminate weld joints, use straight tubes or bent tubes where you can. Try to build sub assemblys, parts where the measurements can be made on the work bench, then add them to the main chassis.Get a good tube notcher, if you don't already have one, proper notching helps to hold tubes in the right spot.Last edited by fortyonethirty; 01-05-2011 at 12:27 PM.Ian TannerKawasaki KX450 and many other fine tools
Reply:Thanks for the suggestions, hopefully we'll be getting the tubes laser notched.
Reply:Just a comment about the overall design.break up the initial design into two phases.1) I see tabs on the drawing that indicate your are mounting something(s). There should be as direct as possible connection to strong points on the existing chassis.2) If you need guards (like a roll bar), that's a separate design. Design it separately and then make a 2nd pass at the design to consolidate tubes. Move a tube a little and it can do two jobs.Your drawing shows a couple of tubes that are cut/joined. Avoid that like the plague.Having one big cluster were lots of tubes meet might make for a strong joint, but be aware that it complicates welding. You might have to put cross braces in place before the main tubes can be put in etc. etc. Spend some time on joint design and see if you can sequence the weld (which tubes welded in which order).For example, you show a cross-brace at the bottom, in between existing tubes. How exactly are you going to fit that in? Cut existing tubes? Maybe fill in the center with sheet metal instead?Oh, and not everything requires a cross-brace. Triangulation is nice, but it can be overdone. Look at the supports to the main hoop. If you move the attachment points, perhaps you can do it with a single straight piece. One other thing, "triangles" aren't always necessary. Trapazoids are just as good. If you think I'm full of it, consider this. If the two tubes that go up to what looks like a roll bar get pinched "inwards" (toward each other), they will essentially collapse the roll bar section. That little cross bar 1/2 up is not in the right place. If that is indeed a rollbar, the bars that should prevent collapse should be attached to a known strong point on one end, and a straight shot to the bar.Having said that, yes, its best for calculations that all tubes meet at a theretical point. But its not always practical to do that. Consider offseting some of the joints (simpler joints). If you need to gain back some strength, for joints that are in shear, add gussets.Con Fuse!Miller Dynasty 350Millermatic 350P-Spoolmatic 30AMiller Multimatic 200Hypertherm PowerMax 1000G3Miller Maxstar 200DX
Reply:Good points, I also noticed that there seems to be an excess amount of tubing at certain locations however I'm not the person in charge of designing the frame but I have told him this but there seems to be issues with the suspension if we start moving tubing around.The other points were very helpful and I'll go ahead and try to get the designer to look into your suggestions.On a side note, some of the tubes look as if they'll be joined with another tube but that is just the way we drew it up on solidworks. The final results will be 1 single tube. |
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发表于 2021-9-1 00:21:41