[modeleng] Re: Screwcutting--O/T WOMEN
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sat, 24 Nov 2007 15:56:09 -0800 (PST)
I understand your method of threading and I understand
about SWMBO as well. I took my better half shopping
yesterday and got her a Royal Doulton Tea Set for
Christmas! Gotta win those Brownie points whenever
you can!!
Al
--- Patrick Coppens <develop@xxxxxxxxx> wrote:
> Allen Messer wrote:
> > Patrick, I have only done it a few times when
> cutting
> > internal threads when I could not observe the
> tool. I
> > was cutting some .750" x 55 Whitworth threads and
> used
> > this method on this one off job.
> >
> > Question: doesn't your lathe have a threading dial
> > mounted on the saddle that engages the feed screw?
>
> > This is what I always use whether threading
> internally
> > or externally---always engage the half nuts when
> the
> > same number comes up to the "mark", dis-engage at
> the
> > end of the cut, wind out the cross feed about a
> > hundred thou, crank the carriage back to the end
> of
> > the job, advance the crossfeed screw to Zero,
> advance
> > the compoound feed a few thou, wait for the right
> > number to come up to the mark and then engage the
> half
> > nuts again. It takes longer to tell about it than
> it
> > does to do it.
> >
> > Al
> > --- Patrick Coppens <develop@xxxxxxxxx> wrote:
> >
> >
> >> Allen Messer wrote:
> >>
> >>> It is possible to so mount the threading tool
> >>>
> >> whereby
> >>
> >>> the cut can be made FROM the shoulder TOWARD the
> >>> Tailstock, eliminating the possibility of a
> crash.
> >>>
> >>> Al
> >>> --- Patrick Coppens <develop@xxxxxxxxx> wrote:
> >>>
> >>>
> >>>
> >> Allan,
> >>
> >> This is true, and I have done that in the past,
> on
> >> repeat jobs, but it
> >> is a bit "of a to do" if it is only for one
> piece,
> >> don't you think so?
> >>
> >> Patrick
> >> MODEL ENGINEERING DISCUSSION LIST.
> >>
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> >>
> >>
> >
> >
> >
> >
>
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> >
> Allan,
> The big lathe does have an indicator, and uses the
> classical half nuts,
> so no problems there.
> It is the "smally" that doesn't have one!
> The lead screw is mounted under the bed, instead of
> in front of it.
> All in all a very handy and versatile machine, but
> this is one of its
> drawbacks!
> That is why I don't disengage the saddle and reverse
> it back to the
> beginning of the thread.
> If I wouldn't do that, I would loose my relative
> position.
> The disengaging system itself is great,as it is only
> by the flick of a
> knob, and the saddle stops strait away.
> But I want the engagement to stay, so the saddle can
> go back to its
> position.
>
> So, that is why I started to use the retraction
> tool, as it gave me just
> that 1/2 to 3/4 of a revolution more, that I needed
> to make
> the spindle come to a complete standstill.
> That is usually done, by retracting the cutter with
> one hand, while
> using "the finger" to flip up the protective
> perspex, cover over the chuck.
> The lathe stops then immediately, and the saddle is
> still firmly linked
> to the lead screw.
> I then restart the machine, after having put it in
> "reverse" and run it
> until I clear the piece.
> Then the cutter is shifted forward again,by means of
> the lever, and the
> cross slide is moved in, for the next pass.
> The machine is taken out of "reverse" and started
> again.
> The next pass is executed....
>
> This too take a lot of writing, to explain something
> fairly strait forward.
> As long as there is there is "some" room left, where
> the thread is
> supposed to stop, there is never a problem.
> If you really have to work up to a shoulder with no
> blank bit left at
> all,between the end of the thread an the shoulder
> proper,
> then you have to be really careful, and very, very,
> very ,very slow.
>
> The first time, I ever had to do that, I didn't even
> use the motor of
> the lathe!
> I improvised a crank and rotated the spindle
> manually...
> That was a bit too cautious, but hey what did I
> know!
>
>
>
> *On a different note, and as proof that there
> definitely is something
> funny going on with woman and shoe shops, my better
> half, just walked in
> the door
> as I was writing this mail, claiming that she now
> has seen "boots that
> were beckoning her"! Needless to say she bought a
> pair!!
> *
> Patrick
>
>
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>
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