3 - 4 - 10 hex nut and threaded rod

Draw a 6 sided polygon that is circumscribed around a 0.625" radius (or 1.25" diameter) circle Now draw a circle that is 1.25" in diameter (this is for a reference and will be deleted) Switch to an isometric view and change your UCS to Front Draw a line and use object tracking to place the start point on the outer edge of the circle (the line does not have to be very long) Now rotate the line 25 degrees using the intersection with the circle as your base point Draw a right triangle with a polyline using the Z and X axis as the legs. Start the REVOLVE command, select the triangle and use the center of the circle as your axis of revolution EXTRUDE the hexagon to a height of 0.734" Draw a line across the flats of the hexagon Select the revolved solid and move it to the center of the line on the hexagon Select and delete the reference geometry (should be one circle and two lines) Switch to a FRONT view and mirror the revolved solid across the middle of the hexagon SUBTRACT the two revolved solids Switch to an isometric view and change your UCS to either Top or World. Draw a 21/32" diamter circle at the center on top of the solid Use PRESSPULL to cut the circle all the way through the solid, then delete the circle Add a 1/16" x 1/16" CHAMFER to the top and bottom rings of the cut Use the Conceptual or Realistic visual syles and preview the solid Switch back to 2D Wireframe and an isometric view From the Machinery's Handbook the minor diameter for the External (bolt) and Internal (nut) threads are 0.6309" and 0.6407" With your USC set to Top or World, draw one circle for each minor diameter Switch to a Top view and create an equilateral triangle that measures 0.10" at the base (numerous ways to do this, choose your own) Copy the bottom line with a base point at the center and paste it twice, aligned with the top and bottom corner of the triangle Select the top line, and scale it with a factor of 0.125 Select the bottom line, and scale it wtih a factor of 0.25 Draw two lines perpendicular to the top and bottom lines that cross over the triangle Using the intersections, draw two lines that are parallel to the top and bottom lines, then delete previous four lines and the base of the triangle Draw a Circle with the Tan, Tan, Tan option, using the two sides and the top line as your tanget references Now delete the top line and TRIM all objects as shown Use the PEDIT command and type M for Multiple to select the three lines and the arc to make one closed polyline Switch to an isometric view and change your USC to Front Rotate the thread profile 90 degrees along the Y axis and copy the profile with the base point at the center of the base Swtich the USC to Top or World and past the profile at the top of both circles, then delete the original profile Draw a HELIX using the diameter of the Internal thread (the larger of the two) Change the number of turns to 10 and make sure the height is set to 1", if necessary rotate the helix so the base point is at the top of the circle Draw another HELIX using the diameter of the other circle Change the number of turns to 20 and the height to 2", again, if necessary, rotate the helix Start the SWEEP command and select the profile as the object to sweep, then type A for alignment and switch it to NO Type B for Base Point and select the start point of the helix Now select the helix as the sweep path Do the exact same thing for the other helix Now select both of the helical solids and move them 1" away from their current position Delete both helices This is where you need to cheat a little by adding 0.0001" to each of the diameters so that the helical solids properly UNION to the cylinders Now EXTRUDE the smaller circle to a height of 2", and the larger circle to a height of 1" Move the helical solids back 1" so they are centered on the cylinders UNION each of the solid pairs Switch to Realistic or Conceptual and check our your fancy new threaded parts Swtich to a Front view and move the longer solid down exactly 0.50" to align the center with the shorter solid Now select both of the solids and move them down exactly 0.133" to align the centers of all three solids Switch to a Top view and move the shorter solid to the center of the hex nut (I find it easier to place dimensions and use those as snap points) Switch to an isometric view and SUBTRACT the shorter solid from the hex nut You now have a dimensionally accurate threaded hex nut Now move the other solid to the center of the hex nut Place a SECTIONPLANE at the center of the hex nut Live Section doesn't really show the gap between the threads too well but when you create a section as a block, and zoom in, you can see that the threads have the proper gap Congratulations! You've now made a 3/4-10 hex nut and threaded rod that is accurate to the dimensions show in the Machinery's Handbook