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Internal threading question

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pcb196223/05/2020 12:00:34
65 forum posts

Thanks Jason, you've been extremely helpful, but I think this time I will go with a tap, what's "plenty of room" to you is I feel still going to be very tight for me, thanks again.

pgk pgk23/05/2020 13:12:14
2661 forum posts
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Posted by pcb1962 on 23/05/2020 12:00:34:

Thanks Jason, you've been extremely helpful, but I think this time I will go with a tap, what's "plenty of room" to you is I feel still going to be very tight for me, thanks again.

I might well do the same thing in practice but another of Joe Pie's vids demonstrates cutting a partial depth internal thread outboards i.e lathe in reverse (if you dont have a screwed on chuck) whch has the benefit here of proving the clearance on each tool entry. Also he makes the point that the first pass can be a larger depth of cut than subsequently since the actual cutting surface at that time is smallest. It also allows you to use the smallest stick-out of the tool since you don't have to worry about when to disengage the feed.

For total cowardice there's nowt wrong with a handground HSS tool and manual cranking of the lathe. It's tedious turning the chuck with two keys but do-able..

pgk

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