issue with constraints into a projected sketch

[greenwoods1462]

Hello - I know that this will be a silly one - but I am having trouble constraining Sketch 17 in the attached......basically the rectangle is the start of a spoke that connects the centre to the rim.

Can anyone suggest where I am going wrong.  The circle is a projection from sketch 1 into which I draw a rectangle.  But I am struggling to constrain the rectangle into the sketch.  Am I using projection in the wrong way?

What I want to achieve is that if I change the rim diameter in sketch 1 the spoke is automatically changed in length

Many thanks in advance.

[g-andresen]

Hi,

try it this way:

günther

Sorry, insert GIF doesn´t work.

[g-andresen · Accepted solution]

Hi,

here´s the GIF

günther

[TheCADWhisperer · Accepted solution]

In  your Sketch1 - I would have used Equal (=) constraint rather than 5mm dimension twice.

I seriously doubt the R17.289074 dimension was on the original drawing as that dimension cannot be measured and certainly can't be manufactured.

Do you have original drawing?  I think that I have seen this part posted here many times in the past, but this is the first time I recall seeing Lofted spokes.

[TheCADWhisperer · Accepted solution]

My interpretation Attached.

[greenwoods1462 · Accepted solution]

Thank you - your construction method is much more elegant than mine.  I have been working on this wheel design for some time and asked many questions many of which this group answered so it is probably my model that you have seen before.  I do have the original drawing but it does not include every dimension....it is a works drawing from 1890....

I will study the surface sketch in more detail as I think I will need this going forward.

Many thanks to everyone who responded