ryansanderson172 Posted December 22, 2011 Share Posted December 22, 2011 Hi Ive done some calcs and know the profile which I need to create to create my desired propeller blade, I need to draw each curve in turn, the problem being that I need them to be curved in two directions. ive attached a couple of pics to help As you can see Im having difficulties joing the two points (shows by green line on A4 drawn image) the line needs to be curved in two directions as shown on the A4 sketch.Does any body know how this can be done thanks ryan . Quote Link to comment Share on other sites More sharing options...
Bishop Posted December 22, 2011 Share Posted December 22, 2011 In before fully constrained sketches !!! On a more serious note, though, you'll need to do an intersect or a project in a 3D sketch. Make both your 2D sketches, then play around with those features in a 3D sketch. Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 22, 2011 Author Share Posted December 22, 2011 i know my sketches are not fully constrained, apologies, could you help with the issue though? regards Ryan Quote Link to comment Share on other sites More sharing options...
Bishop Posted December 22, 2011 Share Posted December 22, 2011 As I said, you'll need to do an intersect or a project of some sort in a 3D sketch. To explain more fully: make 2 sketches in 2D, showing a top and front / side view of your shape. You will then probably need to extrude one of them as a surface, and then project the other one onto it in a 3D sketch, or just extrude both as surfaces and do an intersect in a 3D sketch. Really, sorry about the other thing ... I just wanted to see if I could beat JD to the punch. Stick around, read some other threads. It'll make more sense then. Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 22, 2011 Author Share Posted December 22, 2011 cheers, I can make the two points join up to make what i have drawn as the bottom view, but the triangle that is created is a straight face rather than curved alonge the large circles circumference. Im struggling as were almost self teaching as the tutor is a solid works user. Quote Link to comment Share on other sites More sharing options...
Bishop Posted December 22, 2011 Share Posted December 22, 2011 Like this? compoundcurve.ipt Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 22, 2011 Author Share Posted December 22, 2011 bang on, alright smart arse :-) how the helllll. Thats the first curve of many which im going to loft for my turbine design. I need a step by step idiots guide. Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 22, 2011 Author Share Posted December 22, 2011 im guesing i do the two sketches, then extrude in 2d, then use the 3d sketch to pull out the intersection curve? owe you big time!! Quote Link to comment Share on other sites More sharing options...
Bishop Posted December 22, 2011 Share Posted December 22, 2011 Sounds like you've got it ... just take a look at the structure of the .IPT file I attached, you'll see how I strung everything together. Inventor has a little bit of a learning curve, and if it makes you feel any better, I've never been able to wrap my head around Solidworks. I keep trying it out every couple years, but it's just completely opaque to me. I started off self-teaching Inventor about 2 years ago - you can watch my progress through my posts here, really - and with some effort and practice, I do this for a living now. Quote Link to comment Share on other sites More sharing options...
JD Mather Posted December 22, 2011 Share Posted December 22, 2011 im guesing i do the two sketches, then extrude in 2d, then use the 3d sketch to pull out the intersection curve? owe you big time!! The two extruded surfaces aren't needed (haven't been needed for 4 or 5 years). Simply do a 3D sketch and select Intersection Curve and it will create the same curve as the intersecting surfaces. Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 22, 2011 Author Share Posted December 22, 2011 Thanks for all your help, the trouble I had with 3d sketches is that when I drew an arc I couldn't control where the centre point of the arc was, it seemed to move along an axis by its self. Cheers Ryan Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 23, 2011 Author Share Posted December 23, 2011 ive managed to make my model, the problem im having now is that when i thicken the blade up by 2mm,(which is controlled by the material im using) because of the angle of the blade, some of the blade doesnt start at the hub, bu starts in mid air. fix for this? Quote Link to comment Share on other sites More sharing options...
JD Mather Posted December 23, 2011 Share Posted December 23, 2011 You are doing too much work. Do not pattern the surfaces. If that blade pitch is actually a helix - then use the Coil command. Otherwise continue as you are - but with only one blade - it can be patterned when done. On the Surface tab click the down arrow and select Extend to extend the surface into the hub before Thicken. Attach your file here if you can't figure it out. Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 24, 2011 Author Share Posted December 24, 2011 hi, wheres the attach option, all i have is add pictures or links, ive created a zip file, but me being a dummy, dont know how to attach it here, is there no paper clip attach link? Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 24, 2011 Author Share Posted December 24, 2011 5 Blade Prop rolled up state.zip hoping this works, if not ill try some thing else Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 24, 2011 Author Share Posted December 24, 2011 5 Blade Prop rolled up state.ipt maybe this works better, cheers ryan Quote Link to comment Share on other sites More sharing options...
ryansanderson172 Posted December 24, 2011 Author Share Posted December 24, 2011 just for info the surfcae fits the hub perfectly before thickened, once thickened the edges of the blade, due to the angle of the blade, do no fully touch the hub on one side, ive tried extendingt the surface before thickening but an error pops up, cheers ryan Quote Link to comment Share on other sites More sharing options...
shirazbj Posted February 6, 2012 Share Posted February 6, 2012 interesting. I am writing an AddIn to draw a wheel automaticly with vb.net. here is the screen recording, you need to click the picture to open a new window and start the animation: https://sites.google.com/site/bjtoolbox/inventor-addin/03-part Quote Link to comment Share on other sites More sharing options...
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