First create a thread profile for SAE (Standard American Equivalent)
threads.
This will RESIZE to work with ANY SAE application.
Draw a triangle using Polygon(edge).
Use Ortho mode and just set the 2 bottom corners ANYWHERE.
Now hit 'U'. Snap to each of the bottom corners and enter '1' in units
dialog.
Chamfer top with distance value of .1 (point 1) and angle of 60.
Draw an ortho line starting with gravity snap at point 1.
Hit 'J' (point control) and choose 'Same Distance as Two Points'.
Gravity Snap at 2 and 3.
Click at 4.
Now use CTRL+A to select all.
Hit 'B' to combine lines.
Now 'Make Plane'.
Gravity Snap to each lower corner including extra line and hit 'U'.
Enter 1 again.
You should now have this.
Set Drawing Handles at 1 and 2 then save as 'SAE thread' in 2D Symbols or
another folder.
Close file.
To create a 1/2-13 bolt with 1 inch of threads: Open a new 2D file.
First define a layer and color for layout work and draw a 1 inch line.
Then apply 13 tickmarks.
Define a layer and color for final product (main) and make it current.
Now load the SAE thread file as a symbol with the 'explode' and 'resize'
option chosen.
Use far right 2 tickmarks to place and size it as shown.
Now use gravity snaps to move the thread over to the end of the line as
shown so it will merge with the bolt body.
Switch back to layout layer.
Extend a line with ortho on, from point '1' to the left end and line snap
to tickmark.
Use parallel by distance to create the centerline '2' from this line using
value .25.
Change to main layer.
Draw a box for the thread body snapping to points shown.
Select the centerline and hit 'S' to scale it.
Pre V14, set handle in center.
V14 choose 'Selection Center'
Enter value of 2 on X axis.
From end of line, draw a 3/8 box defining width and thickness of hex head.
(3/4 inch wide at flats).
To find the actual extent of the hex head for the sweep operation, use
layout layer and draw a polygon hex using 'center-midpoint'. (It's an
option on the 'center, vertex' dialog).
Start at '1' and set second point at lower right corner of box.
Change to main layer.
Use resizing handles to extend box to extent of hex.
Just gravity snap to either the corner or center handle and then to
point 2 on hex. Box will extend straight up.
Draw a polyline to the 6 points.
Use ortho between point 4 and 5.
Select both body profiles and weld them together. (Not the head)
Quick way is hit spacebar and type 'weld' Hit enter
Draw blue profiles on different layer.
Left one touches corner of body.
Right one intersects head at 5/16 inch. (You can draw another box as a
guide to make this easy).
Change to 3D view.
Body, head, thread, and blue end profiles should all be planes.
Select the thread profile and hit 'W' for sweep.
In the dialog add *14 (times 14) to the END of both the Number of
Copies (36)and the Span Angle (360). The calculations will be done for you.
In Vertical Offset enter -14/13 (minus 14 divided by 13)
This gives us 14 offsets in the minus X direction with a value of 1/13th of an inch each)
Select About a Line and click on the centerline (sticking out end).
Look at your side view.
Threads should line up with tickmarks.
Sweep the end blue shape
Copies 36
Span Angle 360
Vertical Offset 0
Solid Subtract it from the Threads.
Sweep the hex head
Copies 6
Span Angle 360
Sweep the blue shape
Copies 36
Span Angle 360
Solid Subtract it from the hex head.
Delete the leftover entities to clean it up.
If you're going to use this as a block or symbol you need all extra
layers and extraneous entities removed.
Since I used a different color to show detail, now I selected all (CTRL+A)
and applied a uniform color.
Added second light source with higher vertical setting.
