[modeleng] Re: Screwcutting
- From: "Ken Strauss" <ken.strauss@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Sat, 24 Nov 2007 09:33:30 -0500
Likewise. Perhaps you could post it on the "Pictures" section of this group?
Alternatively, I'd appreciated a copy to ken.strauss@xxxxxxxxx
TIA
> -----Original Message-----
> From: modeleng-bounce@xxxxxxxxxxxxx [mailto:modeleng-bounce@xxxxxxxxxxxxx]
> On Behalf Of Patrick Coppens
> Sent: Saturday, November 24, 2007 7:20 AM
> To: modeleng@xxxxxxxxxxxxx
> Subject: [modeleng] Re: Screwcutting
>
> Shep wrote:
> > Hi Ron
> >
> > In the little lathe I am building from scratch, I deliberately planned
> the
> > leadscrew engagement lever on the left (as in Myford). My reasons are
> that
> > you are using the saddle hand wheel much more than the screwcutting
> lever -
> > so that the incidence of hot swarf is proportionately greater when plain
> > turning with the handwheel, than with screwcutting. You pays your
> money
> > and you make your choice!
> >
> > On the Emco 10 lathe, which I had before I got the Hardinge (which has a
> > very nifty screwcutting system) I used to reverse the lathe, rather than
> > disengage the leadscrew after each screwcutting pass. I made a very
> > simple slide, which stopped the cross-slide at the exact previous
> setting,
> > after withdrawing, reversing and resetting. I had a micrometer barrel
> > acting against this, with a ratchet with 'thou' clicks. On resetting,
> a
> > few clicks and you were ready for the next cut - if you see what I mean.
> > This was far simpler to make, than a retracting device.
> > I may have a pic of this somewhere, if anyone is interested.
> >
> > This system of reversing, instead of disengaging, obviates any problems
> > with, for instance, cutting metric threads on an Imperial machine; and
> > solves the hot swarf problem!
> >
> > Cheers! Hubert
> >
> >
> >
> > ----- Original Message -----
> > From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
> > To: <modeleng@xxxxxxxxxxxxx>
> > Sent: Saturday, November 24, 2007 11:49 AM
> > Subject: [modeleng] Re: Screwcutting
> >
> >
> >
> >> Hi Patrick
> >>
> >> The retractable toolholder is a nifty device, but the only benefit
> seems
> >> to
> >> be that you don't have to remember the tool setting at each pass. You
> >> still
> >> have to be quick to disengage the leadscrew at the end of the cut.
> >>
> >> When I'm screwcutting, I like to make an undercut at the end of the
> >> thread,
> >> for the tool to run into. I also run the lathe at a fairly slow speed,
> to
> >> give me sufficient reaction time!
> >>
> >> Which brings me onto one of my big grumbles with the Myford lathe. The
> >> leadscrew engagement lever is on the left of the saddle, which means
> that
> >> when you are holding the lever and getting ready to disengage, you have
> to
> >> put up with hot swarf bouncing off the back of your hand! Why they
> >> couldn't
> >> put it on the right, I'll never know.
> >>
> >> Regards
> >> Ron
> >>
> >>
> >>
> >
> > MODEL ENGINEERING DISCUSSION LIST.
> >
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> >
> >
> >
> Hubert,
> If you have any pics going, I am interested, as I still have to
> "finalize" my screw cutting setup, in the small C1!
>
> Cheers
> Patrick
>
>
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