[modeleng] Re: A level lathe
- From: "Clifton" <clif.gwr@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 8 Jul 2011 08:45:16 +0100
Hi All,
To check that a lathe bed is not twisted entails machining a chunk of metal
about 9" long gripped in the chuck. I do a check on my Myford every so often
even though it is fitted to a Myford stand & its amazing how much it can be
out.
Clif
----- Original Message -----
From: "John Pagett" <john_pagett@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Thursday, July 07, 2011 10:40 PM
Subject: [modeleng] Re: A level lathe
> Gents,
>
> I agree that a lathe doesn't have to be level, it just musn't be twisted,
> but here's the thing. If it is level, fore and aft and along the bed, then
> it can't be twisted, and you can determine its levelness (levelity??)
> relatively easily with a spirit level. How do you determine that a lathe
> that is not level isn't also twisted?
>
> So I think the reason is simply that people haven't understood the
> rationale
> behind the mantra.
>
> JohnP
>
> ----- Original Message -----
> From: "Jeff Dayman" <jeffdayman@xxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Thursday, July 07, 2011 10:07 PM
> Subject: [modeleng] Re: A level lathe
>
>
>>I do agree AJ.
>>
>> My old South Bend lathe has a neat feature which helps eliminate twist -
>> the
>> tailstock end rests on a pivot foot, which allows the bed to settle
>> without
>> twisting. This allows the lathe to be bolted to wood or metal benches
>> that
>> may be a long way off level and or twisted but the lathe bed remains
>> rigid
>> and true.
>>
>> Lathe leveling is a similar religion among some ME's along the lines of
>> worshipping the god Myford and making extremely complicated tool and
>> cutter
>> grinders to sharpen $5.00 throwaway millling cutters and 50 cent drills.
>> >ahem< to each his own, however.
>>
>> Cheers Jeff Dayman
>> ----- Original Message -----
>> From: "Terry Lane" <tel.47@xxxxxxxxxxx>
>> To: <modeleng@xxxxxxxxxxxxx>
>> Sent: Thursday, July 07, 2011 5:03 PM
>> Subject: [modeleng] Re: A level lathe
>>
>>
>>> Dead right you are AJ - a level machine means absolutely nothing, the
>>> lathe can be tilted fore and aft, or side to side to almost any angle
>>> and it won't make a scrap of difference, as long, as you say, there is
>>> no twist in the bed.
>>> On 8/07/2011 5:43 AM, Alan Stepney wrote:
>>>> I am sure we have all seen lengthy discussions on the best way to
>>>> ensure
>>>> that a lathe is level.
>>>> Why?
>>>>
>>>> I dont believe that they need to be level at all.
>>>> I have a lathe that came off a Royal Navy Cruiser, and the one thing I
>>>> can
>>>> guarantee is that, at times, the sea isnt level!
>>>>
>>>> The main thing is to ensure that the bed is not twisted in any way,
>>>> and
>>>> the
>>>> headstock and tailstock in line, whether or not that line is level with
>>>> the
>>>> surface of the earth or not, makes no difference.
>>>>
>>>> If it did, vertical borers etc wouldnt work. Or rather, wouldnt give
>>>> accurate results, which they do.
>>>> The same would apply to face milling or fly cutting with a vetical
>>>> mill.
>>>>
>>>>
>>>> Does anyone agree or disagree with me?
>>>>
>>>> Alan
>>>>
>>>>
>>>>
>>>> MODEL ENGINEERING DISCUSSION LIST.
>>>>
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>>>>
>>>>
>>>
>>>
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>>
>> MODEL ENGINEERING DISCUSSION LIST.
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>
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