[modeleng] Re: Screwcutting
- From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Sat, 24 Nov 2007 20:21:31 -0000
Hi Hubert
I presume that before you reverse the lathe, you withdraw the tool a short
way - otherwise the backlash on the leadscrew would cut a double thread?
Regards
Ron
----- Original Message -----
From: "Shep" <shep.28@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, November 24, 2007 12:15 PM
Subject: [modeleng] Re: Screwcutting
> 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
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