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  • Users: Cockroach
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  1. Cockroach

    How to Perforate a Pup Joint?

    I have a 88.9 mm OD X 13.84 kg/m Pup Joint (3 1/2 X 9.20#), 3.0 m long, EUE Pin X Pin. The intent is to convert this to a Perforated Pup Joint by drilling 19.0 mm holes through the wall. I need 2.0 m of holes, 14 holes/meter. The hole pattern is a helical wrap, each hole is 60 degrees apart...
  2. Cockroach

    Torsion Spring - Animated Model

    I have seen and automated Compression/Extension Springs using SolidWorks, but never a Torsion Spring other than sweeping a circular profile around some advanced compound curve. How can I automate this? Does anyone have a reference or tutorial on how to mate this with, say, a spring return door...
  3. Cockroach

    Smart Mates - Linear Coupler?

    I have a Mandrel with a left hand screw at the top end, and a right hand screw at the bottom end. As the Mandrel is spun to the right, the screws advance a set of Cones. Imagine your two fists coming together as the Mandrel is rotated to the right, and separating with left hand rotation. In...
  4. Cockroach

    Spring Return Mechanism

    I have a Clapper which is held by a 5/32 inch axial to a Seat, a check valve arrangement. The Clapper weights 4 1/2 lbf, the centre of mass is 3 1/16 inches from the centre line of the axial. I need the Clapper to be spring return, 95 degree rotation counter clockwise. Using a torsion spring...
  5. Cockroach

    Composite Curves - Threads

    I am drawing a 4 1/2 IF Pin and would like to show the vanishing threads. To do this, I would like to joint two helix, the first is simply the tapered path (taper=2in/ft) up to the cylinder diameter (14 thds at 0.25 in pitch). The second helix is simply a spiral which is also tapered, but at a...
  6. Cockroach

    Dynamic Model of a Torsion Spring

    I have been successful with this forum in the past to dynamic load a Compression Spring and automate height based on a moving part. I would like to do the same with a Torsion Spring. How can I show a straight arm rotating 90 degrees from the relaxed position? Is there a site or perhaps a lead...
  7. Cockroach

    MathCAD Decision Statement

    I have the following statements in a MathCAD 14 program: X=1 Y=2000 XPRIME <== (X + 13) if X < 3 YPRIME <== (Y - 1) if X < 3 I find that the "if" statements are not executing, running the following debug lines generates "variable undefined" error, returned in red text. Adding the two lines...
  8. Cockroach

    MathCAD While Loop

    I'm trying to get a very simple example started used the Kepler Equation, E = M + e sin E, which is an iterative solution set given M and e as constants. So I guess E and compute the right hand side, thus generating E' on the left. This would then feed into E on the right and I would recompute...
  9. Cockroach

    Torque Bias Thread - Oilfield Application

    Suppose an inclined thread for use in an oilfield tubing application is torqued to 20 ft kip, right hand. I need to get off of this connection at a maximum of one-third that value, left hand. Obviously it is not possible using a simple box & pin connection. Is there another way to do this...
  10. Cockroach

    Collet Design Model

    Has anyone visited or seen a website/forum which discusses the equations regarding forces for stabbing, withdrawl and stresses associated with Circular Collets? I would hate to re-invent the wheel if there are already "canned programs" available. Many thanks! Kenneth J Hueston, PEng Principal...
  11. Cockroach

    Inclined Thread Strength

    I am interested in sourcing the proper formulae regarding the shear or thread strengths for inclined thread forms, NPT, EUE, NUE, VAM, etc. How much tensile load can a particular threaded connection handle? To date I have been &quot;rectifying&quot; an inclined thread using an equivalent...

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