[modeleng] Re: Screwcutting

Hi Ron

Yes, undoubtedly!    On my ex-Emco I made a device to do this (see my last 
email!), and when I get around to screwcutting on the little lathe (maybe 
next year!?) I will make some such method.

Cheers!   Hubert

----- Original Message ----- 
From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, November 24, 2007 8:21 PM
Subject: [modeleng] Re: Screwcutting


> 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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