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O-Ring Face Seal

O-Ring Face Seal

O-Ring Face Seal

(OP)
Hi,
I'm designing a simple face seal and need to control the ID of the groove (external pressure). I have 4 lines and 4 radii and would like to combine it with one dimension to control the ID circumference. How do I do this? I was able to combine the geometry by making a "Make Path" (screen grab & RMB), but how do I dimension it once it's joined.

Thanks,

Macduff spin
Colin Fitzpatrick
Mechanical Design Engineer
Solidworks 2007 SP 5.0
Dell 390 XP Pro SP 2
Intel 2 Duo Core, 2GB RAM
nVida Quadro FX 3450 512 MB

RE: O-Ring Face Seal

Assuming you have two of the three variables (line length, arc length (or radius) and perimeter length) known, you should be able to use an equation or DT to set the third.

cheers

RE: O-Ring Face Seal

(OP)
CBL,
I just started looking into that, but can't get it to work.

This is what I got:
 ( "D2@Sketch1" + "D2@Sketch1" )  * 4 =

I get "Equation Entered is Invaild". I'm kinda a novice at this function

Also, how do I dimension radius and get its arc length?

Macduff spin
Colin Fitzpatrick
Mechanical Design Engineer
Solidworks 2007 SP 5.0
Dell 490 XP Pro SP 2
Intel 2 Duo Core, 2GB RAM
nVida Quadro FX 3450 512 MB

RE: O-Ring Face Seal

Partial arc you click arc segment then each endpoint to get arc length.

For a full circle, just do the math C=πØ.

batHonesty may be the best policy, but insanity is a better defense.bat
http://www.EsoxRepublic.com-SolidWorks API VB programming help

RE: O-Ring Face Seal

(OP)
i just figured out the arc length in the help section, thanks. Still need help with the equation thing.

Macduff spin
Colin Fitzpatrick
Mechanical Design Engineer
Solidworks 2007 SP 5.0
Dell 490 XP Pro SP 2
Intel 2 Duo Core, 2GB RAM
nVida Quadro FX 3450 512 MB

RE: O-Ring Face Seal

Result goes on the left, parameters on the right.

DimensionToControl = ( "D2@Sketch1" + "D2@Sketch1" )  * 4

FAQ559-590: Rename sketch dimensions used in equations
Always rename dimensions used on both sides of the equation.

Dimension your groove so that the entire shape is constrained to itself and the position (ID) is the final constrained needed to fully constrain.

RE: O-Ring Face Seal

(OP)
I'm such a dumb#$s, thanks! I have to think exel when I do this, huh?

Now that I kinda have that out out the way...I would like to control the overall input value (total length of the shape) and have the 4 radii remain constant (designed value a known) and have the 4 lines adjust in length, based on changing the overall length.

Are ya with me?

I'll try and upload a image.

Macduff spin
Colin Fitzpatrick
Mechanical Design Engineer
Solidworks 2007 SP 5.0
Dell 490 XP Pro SP 2
Intel 2 Duo Core, 2GB RAM
nVida Quadro FX 3450 512 MB

RE: O-Ring Face Seal

Curious...whay an arc length? Wouldn't a simple radius be easier and cheaper?

Chris
SolidWorks/PDMWorks 08 2.0
AutoCAD 06
ctopher's home (updated 10-07-07)
ctopher's blog

RE: O-Ring Face Seal

A DT might be easier to use if you will be having multiple sizes.

Equation;
VerticalLength=(Perimeter-(ArcLength*4+HorizLength*2)/2

cheers

RE: O-Ring Face Seal

You can input a global variable in the equation table for the overall length ("OAL").

arc length for 90° arc = pi*r/2
This way you can just control radius of corner

You need parentheses:
OAL = 4*(D1 + D2)
with D2=.228 and D1=3 result is 12.912, your perimeter result is wrong the way you have it.

Change your arc length back to a radius and try this:
OAL = 12.228
D1 = (OAL - 4 * (pi*radius/2) ) / 4

RE: O-Ring Face Seal

(OP)
Chris,
I need the arc length to be adding to the total length. the radius size is different than the arc length. this is needed when I size the id of the oring.

Macduff spin
Colin Fitzpatrick
Mechanical Design Engineer
Solidworks 2007 SP 5.0
Dell 490 XP Pro SP 2
Intel 2 Duo Core, 2GB RAM
nVida Quadro FX 3450 512 MB

RE: O-Ring Face Seal

(OP)
TheTick,
AWESOME! How many stars can I give you!

I can now plug in my overall length and even adjust the radii and everything adjusts. As they say in the Guinness TV commercials; Brilliant!

Hey, can you check the attachment?

Thank you so much!

Colin

Macduff spin
Colin Fitzpatrick
Mechanical Design Engineer
Solidworks 2007 SP 5.0
Dell 490 XP Pro SP 2
Intel 2 Duo Core, 2GB RAM
nVida Quadro FX 3450 512 MB

RE: O-Ring Face Seal

Looks like what I meant to say.

You can double-check results by selecting all the curves and using the measure tool to get total length (length also shown at bottom of SW window).

RE: O-Ring Face Seal

(OP)
I took me a few trys to get it, but I got it. Yes I did double check through the measure tool.

Best,

Colin

Macduff spin
Colin Fitzpatrick
Mechanical Design Engineer
Solidworks 2007 SP 5.0
Dell 490 XP Pro SP 2
Intel 2 Duo Core, 2GB RAM
nVida Quadro FX 3450 512 MB

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