[modeleng] Re: A level lathe

Jeff old buddy,

As promised, I found my Starrett catalog  (Special 1980 100th Anniversary 
issue) and though it does not give the amount the 15" Master level vial is 
ground , it does say the level has graduations on the vial to 10 seconds or 
.0005" per foot.  Also, the top is made of a non heat conductive material so 
you will not affect the bubble when handling it. Catalog is a late one and 
does not tell the radius of the main vial on the "Mechanics improved level", 
but it does say the little cross level vial is also ground and states that 
ground vials are approximately 4 times more sensitive than plain vials. No 
prices in cataloge, but I will stick with the level I have as I have no 
machinery to level anymore since I got out of the sawmill business and do 
not plan on moving my lathe.

Jesse in Troy, TN where it is 81° F and sun is shining.



----- Original Message ----- 
From: "Jeff Dayman" <jeffdayman@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, July 08, 2011 4:59 PM
Subject: [modeleng] Re: A level lathe


> Hi Jesse,
>
> I've often wondered exactly how those high precision glass vials were 
> ground
> with an inside rad. I guess it could be done with a spherical grinding 
> wheel
> mounted on a long spindle (to get the wheel way up into the tube). The
> spindle could then ride on a follower which in turn could ride on a
> precision ground steel guideway. The glass tube would have to be 
> accurately
> held in a collet during grinding and rotated as the grinding wheel makes 
> the
> spherical arc inside.
>
> I also guess less accurate ones could be made by heating and bending the
> glass tube to an arc shaped former.
>
> Is that how it was or is done?
>
> Anyone in industry actually seen it done?
>
> Cheers Jeff Dayman (also HOT also DRY Waterloo Ontario Canada 31 deg C )
> ----- Original Message ----- 
> From: "Jesse Livingston" <fernj1@xxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Friday, July 08, 2011 5:17 PM
> Subject: [modeleng] Re: A level lathe
>
>
>> Affect coolant flow??  What is coolant?  I have never seen a coolant pump
>> on
>> my Atlas 10" lathe.  Maybe I need to look it over again and see if
>> something
>> is hiding up under the chip pan.  Ooops, Ain't got no chip pan on the
>> Atlas.
>> I do have a Starrett 8" precision level though.One of them there levels
>> that
>> will vary if the wind blows on the glass tube.  Also, you can't touch the
>> glass or the bubble will run to the end where you touched it.  I used it,
>> as
>> had my father, to set our sawmill machinery as well as checking my lathe
>> for
>> twist etc.  A bloke from sawmill across the street borrowed it to set 
>> some
>> of their machinery.  He set it on the dash of his PU truck and our hot
>> Southern sun caused the glass to shatter when it shrunk the bubble.
>> Anyway,
>> his sawmill bought me a new bubble assembly.  BTW:  Those 8" Starrett
>> levels
>> have the inside of the glass tube ground to a radius of 120 feet. 
>> Starrett
>> makes a 12 inch "Master Level", but I can't afford one of those cuties. I
>> have used one of them to set machinery at the aluminium rolling mill 
>> where
>> I
>> once worked.  If you stare at one end of the tube on those, the bubble
>> will
>> run to the end where you are looking. [:>)  Well it seems that sensitive
>> anyway.
>>
>> Jesse in HOT dry Troy, TN US of A.
>>
>>
>>> It might effect the coolant flow.....
>>>
>>> ----- Original Message ----- 
>>> From: "Terry Lane" <tel.47@xxxxxxxxxxx>
>>> To: <modeleng@xxxxxxxxxxxxx>
>>> Sent: Thursday, July 07, 2011 10:03 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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>>>>> subject
>>>>> line.
>>>>>
>>>>>
>>>>
>>>>
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