epicyclic curve
in [SolidWorks]
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From: Giorgis on 24 May 2005 03:53 I need to draw an epicyclic curve on a sketch. Any ideas on how I can go about it ? Kind Thanks Giorgis
From: TOP on 24 May 2005 09:28 Do you have an equation?
From: wurz on 24 May 2005 10:14 Giorgis wrote: > I need to draw an epicyclic curve on a sketch. > Any ideas on how I can go about it ? > > Kind Thanks > > Giorgis Seems like my Tech Drawing classes at school weren't a waste after all ;-) An epicyclic curve is the locus of a point on the perimeter of a small circle rolling (without slipping) around a larger circle. I'm not sure that there is a single mathematical expression for it - but it's one of those things that's easier to draw with a pair of compasses and a rule than on CAD..... I think that to draw it in SW, you would have to think more like a draughtsman and 'construct' the circles and lines, then tie together key quantities using equations and linked values. Might have a go at this one when I get a minute.... Martin
From: Jeff Howard on 24 May 2005 10:53 > I need to draw an epicyclic curve on a sketch. > Any ideas on how I can go about it ? Maybe this will help in the effort... http://mathworld.wolfram.com/Epicycloid.html
From: Brian on 24 May 2005 11:21 I don't believe there is a way to draw this in SW with 8 place mathematical accuracy. But here is something that "may work": -Two simple cylinders cooresponding to the minor and major diameters placed into an assembly with gear mates between the two and other constraints that only allow appropriate motion -a point on the perimeter of the smaller which will allow you to extract its location -create an assembly sketch and convert the above points' location, remove the coincident constraint and make the point fixed. -rotate the larger cylinder -rinse and repeat -a spline created from the generated points should give a reasonable representation Creating a macro to auto-rotate the large cylinder, extract perimeter point data, and repeat at a given increment should allow for a reasonably high degree of accuracy -- Brian Hokanson Starting Line Products "wurz" <mjs_cadman-ccsw(a)yahoo.co.uk> wrote in message news:1116944042.503042.314790(a)g49g2000cwa.googlegroups.com... > > Giorgis wrote: >> I need to draw an epicyclic curve on a sketch. >> Any ideas on how I can go about it ? >> >> Kind Thanks >> >> Giorgis > > Seems like my Tech Drawing classes at school weren't a waste after all > ;-) > > An epicyclic curve is the locus of a point on the perimeter of a small > circle rolling (without slipping) around a larger circle. I'm not sure > that there is a single mathematical expression for it - but it's one of > those things that's easier to draw with a pair of compasses and a rule > than on CAD..... > > I think that to draw it in SW, you would have to think more like a > draughtsman and 'construct' the circles and lines, then tie together > key quantities using equations and linked values. > > Might have a go at this one when I get a minute.... > > Martin >
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