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I have a cylinder and have tried to add a partial thread to the outside of it. The original cylinder was 0.312 inch OD. The thread was "(5/16)-18" male.
The thread was not the full length of the cylinder though, only the first half or so. No errors or warnings were encountered during this, but the end result was most definitely not expected.
After adding the partial length thread, the OD of the remaining unthreaded section of the original cylinder (the smooth part that should not have been affected) had shrunk to 0.308 inches! I did not notice this until way later when I was doing the 2D drawings for the part.
This makes my bolt shoulder (the smooth section) 4 thou smaller than I had designed it (enough to push it out of acceptable tolerances!).
Were this a real lathe-threading operation, the shoulder would not magically shrink by 4 thou. This problem does seem to be reproducible.
The original cylinder was 1.5 inches long and the thread was set to affect only the first 0.750 inches. All of this takes place within the "Model" environment.
Solved! Go to Solution.