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<blockquote data-quote="Susquatch" data-source="post: 67115" data-attributes="member: 2421"><p>I don't understand. What has the 29° (I use 29.5) have to do with the relief cut? </p><p></p><p>The 29 degree cut is only for the compound advancement. It is not for the main cut which is still done by the carriage cutting R to L for a normal outside thread. </p><p></p><p>The compound advancing at 30 or 29 or 29.5 for each pass merely keeps the cutting on one edge (instead of 2) to minimize the load. To be more precise, the idea of the 29 and 29.5 is to do a tiny skim cut on the second edge to keep the thread surface clean and smooth. Otherwise you could just do a 60 degree plunge cut using both edges. </p><p></p><p>There are other combinations, but for a RH outside thread like you describe, cutting in reverse allows you to cut on the front side with an upside down tool or on the backside of the lathe right side up but both from L to R.</p></blockquote><p></p>
[QUOTE="Susquatch, post: 67115, member: 2421"] I don't understand. What has the 29° (I use 29.5) have to do with the relief cut? The 29 degree cut is only for the compound advancement. It is not for the main cut which is still done by the carriage cutting R to L for a normal outside thread. The compound advancing at 30 or 29 or 29.5 for each pass merely keeps the cutting on one edge (instead of 2) to minimize the load. To be more precise, the idea of the 29 and 29.5 is to do a tiny skim cut on the second edge to keep the thread surface clean and smooth. Otherwise you could just do a 60 degree plunge cut using both edges. There are other combinations, but for a RH outside thread like you describe, cutting in reverse allows you to cut on the front side with an upside down tool or on the backside of the lathe right side up but both from L to R. [/QUOTE]
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