Bind threading
¿ªÔÆÌåÓý??? ??? Thats what the thread stop is for , the 2nd purpose . It was desgined for that purpose , not a " if " . ??? animal On 1/25/24 8:50 PM, Charles Kinzer
wrote:
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Actually, the original design was for neither of those purposes.? It was for setting each increment when using just the cross slide to cut threads.? Not as a full depth stop if moving in at increments with the cross slide handwheel, and not as a cross slide repeatability stop if using the compound. The South Bend booklet "How to Run a Lathe" was most certainly an industry standard (and I think most would consider it authoritative), and this is from that book.?? However, I have never seen anyone use the stop in the manner described in this booklet.? But just because I haven't doesn't mean people don't use one that way.? I have only seen the 29.5 (or 29) degree angle scheme mostly using, and the straight in sometimes used. I think its original goal was to help prevent mistakes.? With cross slide threading, you withdraw a lot and then return to the starting point (often off the end of the workpiece being threaded).? Then you have to turn the handwheel back in remembering where it last was, and then adding whatever more you want for the next cut.? Easy to make a mistake, especially setting too deep of a cut.? Using the stop as they described would mitigate that. One other point of confusion that some might have is that the term "thread stop" or "threading stop" also has a completely different meaning.? And that is for schemes that stop the longitudinal motion of the thread cutting at the end of the thread. Charles E. "Chuck" Kinzer
On Friday, January 26, 2024 at 10:57:25 AM PST, mike allen <animal@...> wrote:
??? ??? Thats what the thread stop is for , the 2nd purpose . It was desgined for that purpose , not a " if " . ??? animal On 1/25/24 8:50 PM, Charles Kinzer
wrote:
I can see how that can be
confusing.
If you are threading using
ONLY the cross slide, the "thread stop" can be used as a limit
for the depth of the thread cut.? That's pretty straight
forward.
But there is another
purpose.? If using the compound at an angle, it is typical to
use the cross slide to retract the tool, move it for the next
cut, and then move it back in (returns tool bit to starting
position at the last cutting depth) while leaving the compound
position alone.? In this case, the "thread stop" can be used
so that when you return the cross slide for the next cut, it
always returns to the same place.? (You don't have to read the
handwheel - and it keeps you from making mistakes.)? Then you
move the compound in further for the next cut.? In this case,
it isn't really being used as a thread stop, but just as a
cross slide stop so you always return it to the same place..
If you wanted a thread stop
on the compound to limit motion to the maximum thread depth,
you would have to rig something up for that unless somebody
sells such a thing.? Most everything you can think of probably
exists somewhere, but I'm not aware of a commercial stop for
the mini lathe compound.
Charles E. "Chuck" Kinzer
On Thursday, January 25, 2024 at 07:07:41 PM PST,
davesmith1800 <davesmith1@...> wrote:
Here photo of almost the lathe one.
But not compound angle also a thread stop for same lathe can only be straight in. This where it gets confusing new at using a lathe. I use the compound at 90¡ã so I can make fast changes using the carriage stop.? Dave? Attachments: |
Charles Kinzer 8:06am? ? And that means exactly nothing. It is rotatable and just happens to be in that position When first lath my father had a less experience that most have here. So trial and error learning. We set compound to 29.5¡ã and that how we did threading.? When I got Mori Seki Lathe in 1976 on the compound was large you want to straight in. Work great. The South Bend Lathe cross slide stop was for production work. I hate to see the thread quilty.? Dave? |
davesmith1800