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sjthielbar
Posts: 28
Registered: ‎10-02-2006
Message 1 of 3 (130 Views)
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Ramping a coil/helix

130 Views, 2 Replies
03-14-2014 12:48 PM

I'm using Inventor 2012, and I'm trying to model a coil/helix. I've run into a new coil which after two revolutions with a tight pitch (.0005" over the wire diameter which is .0185") I need to make the next 3 revolutions ramping from a .025" pitch to a .060" pitch.

 

Any ideas? I'm thinking that it won't be possible using the coiling feature alone since there are no options to accomodate this.

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Cadmanto
Posts: 3,199
Registered: ‎12-07-2011
Message 2 of 3 (112 Views)

Re: Ramping a coil/helix

03-14-2014 02:08 PM in reply to: sjthielbar

I think it is possible, but you are going to have to orientate your planes such that when the one coild stops (flush with a vertical plane) the other one picks up with the other pitch.

Here is an example of what I was talking about.

 

coil.jpg

What I did was create the first coil to your first specification, then the second was 1.5 turns at a pitch of .025 and the third was another 1.5 turns at .060 pitch.  I created a step file so you can at least have a model of it.  Because I have 2014 and you can't open the actual model file.

 

 

check.PNGIf this solved your issue please mark this posting "Accept as Solution".

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Best Regards,
Scott McFadden
Inventor Professional 2013
(Colossians 3:23-25)

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JDMather
Posts: 26,352
Registered: ‎04-20-2006
Message 3 of 3 (105 Views)

Re: Ramping a coil/helix

03-14-2014 02:22 PM in reply to: sjthielbar

3D sketch wrap displacement curve around cylinder.  (in later versions there are additional options, like equation curves)

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