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How to Suck Eggs!
Doc:
There is a reason for keeping the compound slide at 29.5 degrees it is set there for threading plunging straight in puts strain on the tool bit and actually rips the thread and ends up chipping the tool a lot of time unless you take very small cuts. When you advance at 29.5 you cut only with the leading edge of the tool bit and you can take larger cuts without chipping tool.
How I was taught many years ago and it has always preformed good is in thread cutting advance the compound to the end of its stroke the touch off stock using cross slide then back off compound adjust cross slide in double the thread depth. Now proceed cutting thread advancing the compound until you reach end of travel and there you are thread finished.
Anyway I seen this thread and the speculations at why the compound was set as it was I hope I made sense, I've been using this method for 40 years and it has always worked for me.
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