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Hello Yingxi,I am new on lathe operation. I am wondering that how to set lathe thread tool accurately? Because I have no idea about its setting on Z-axis.
it is a little risky to use only 0.1 clearance ...
... tool before threading may go at-40+0.03
... threading tool may go at -39.9-0.03
... and there is syncro precision
that 0.1 is a risky move, even on a calibrated lathe with quick reaction time
it is a little risky to use only 0.1 clearance ...
... tool before threading may go at-40+0.03
... threading tool may go at -39.9-0.03
... and there is syncro precision
that 0.1 is a risky move, even on a calibrated lathe with quick reaction time
the nut generally has enough chamfer, so there is no need to go that close to the shoulder
on a long setup, the tool before the thread insert may get damaged, leading to a crash on the threading tool, that will be more expensive than replacing the insert on the previous tool
also going that close, means that there is no groove at the end of the thread, so the thread insert finished cutting inside the material; in such a case, when clerance is 0.1, there is no room for lead-out movements, and as a result, insert life spam is reduced
i am not saying that 0.1 clearance is impossible; but is not common practice to go that close to a shoulder
We turn and bore a shoulder with a turning tool and don't sweat it at all holding +-.0005" on Z location, why would it be different with a thread tool?
In my world and it would seem that of IronReb's, it is common practice to go that close to a shoulder
is different cinematic between turning and threading ...
once an inner tool finished, it dwells and/or retreats a bit in feed, and after contact with material is disengaged, it rapids out
a thread tool will disengage in rapid
try to thread M28x2 at 2000 rpm, with 0.1 clearance, on thousands of parts how does this sound to you ?
deadlykitten said:share why it is necesary to go that close ... and not because the drawing is like that
If I want to set lathe thread tool much accurately? Is there any other methods to deal with it? It is said that there is tool setter to do this job accurately in the machine, but I do not known how it makes it. Do you know that?
Just like Johnny Larue, the more you Post the more your lack of knowledge become apparent.
Before the Threading Tool moves in Rapid in X to disengage from the Thread, it Stops in Z at the specified point, or if anything, it starts the X acceleration during the end of the Z deceleratio; but in practical terms, the Z axis doesn't end past the specified Z point. Its irrelevant as to whether it is a Turning, or Threading tool; the common link is Motion Control
"Because the drawing is like that" is the reason, even if its unreasonable. I and my clients never have rejected work because the drawing instructions were not followed. And as for the necessity to go that close, I've explained that in my previous Post.
If I want to set lathe thread tool much accurately? Is there any other methods to deal with it? It is said that there is tool setter to do this job accurately in the machine, but I do not known how it makes it. Do you know that?
i know how this works at 0.1 clearance, if the tool before the threading gets a bit of wear, than a crash will occur ...
also, with a bit of luck, this crash will occur at 1st part, with new tools, and this is how :
... tool before threading may go at -40+0.03
... threading tool may go at -39.9-0.03
...... so far there is 0.1-0.03*2=0.04
... and there is syncro precision, or you think that cnc will stop at same point when cutting 500rpm*0.5thread, versus 1800rpm*2 ? well, consider at least 0.005
in the end, what you get is 0.035, and that is 35% of the expected 0.1 tolerance .. and now try to keep that up for thousands of parts
if next day thread insert is chaged and the thread tool is measured at the senzor, it may input an aditionally 0.05 : 0.02 from insert precision and 0.03 from tool setter over night deviation
at this moment 0.05 is > 0.035, and bang well, is not a big crash, but it will scracth the surface of the part
on tight things i always try, and so far succeded, to find a common ground with the client
i dont regard the drawing as being prioritary, but only as a form of comunication
some parts have drawings and manuals, covering all the ways arround
deadlykitten said:hy / just cut a thread, and after that just say what is wrong with it and what you wanna do better
another thread trashed by the deadly idiot.
Too true vanc. Here we have an information seeker that by his own admission, is new on lathe operation and, as you so succinctly put it, the Thread has been fucked over by the idiot.Another thread trashed by the deadly idiot.
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