From: James P Crombie 
To: Atm List 
Reply-To: James P Crombie 



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Rick
  Ther is a 10-32 tapped hole on the center boss that is not shown in the
pictures.
The hole was reamed to .3750 and the shaft of the indictor is .3745.  So
there is a 1/2 thou of play which should not affect the accuracy to much
:-)

Date: Fri, 28 Feb 2003 07:20:28 +0000
From: "Richard F.L.R. Snashall" 
Subject: Re: ATM Spherometers

James P Crombie wrote:

>>
>> Hello all
>>  As my mirror grinder nears completion  I needed another spherometer, as
>> my earlier one is out on loan. So I found some scrap SS at work and did
>> a quick sketch and over the last two nites machined a ring style
>> spherometer.  4" for mirrors and 3.75" inside for use on
lense(someday
>> :-)  The base was lapped flat and square to the sides
>> http://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_2.jpg
>> http://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_3.jpg
>> http://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_4.jpg
>>
>
>

What keeps the dial indicator from slipping?

        Rick S.


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James P Crombie

Summerside                   Machinist
Prince Edward Island         Amateur Astronomer
Canada                       3D Designer

E-mail                       jpcrombie{at}pei.eastlink.ca
Astronomy webpage            http://users.eastlink.ca/~jpcrombie/
Rhinoceros 3D webpage        http://users.eastlink.ca/~jpcrombie/rhino/
Mirror Grinder page          http://users.eastlink.ca/~jpcrombie/pics/
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Rick
  Ther is a 10-32 tapped hole on the center boss that is not shown in the
pictures.
The hole was reamed to .3750 and the shaft of the indictor is .3745.  So
there is a 1/2 thou of play which should not affect the accuracy to much
:-)

Date: Fri, 28 Feb 2003 07:20:28 +0000
From: "Richard F.L.R. Snashall" <rflrs{at}rcn.com>">mailto:rflrs{at}rcn.com"><rflrs{at}rcn.com>
Subject: Re: ATM Spherometers

James P Crombie wrote:


  > 
> Hello all
>  As my
mirror grinder nears
completion  I needed another spherometer, as
> my
earlier one is out on loan. So I
found some scrap SS at work and did
> a
quick sketch and over the last two
nites machined a ring style
>
spherometer.  4" for mirrors and
3.75" inside for use on lense(someday
> :-) 
The base was lapped flat and
square to the sides
> htt">http://users.eastlink.ca/%7Ejpcrombie/pics/4_inch_spherometer_2.jpg">htt
p://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_2.jpg;
> htt">http://users.eastlink.ca/%7Ejpcrombie/pics/4_inch_spherometer_3.jpg">htt
p://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_3.jpg;
> htt">http://users.eastlink.ca/%7Ejpcrombie/pics/4_inch_spherometer_4.jpg">htt
p://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_4.jpg;
> 
  


What keeps the dial indicator from slipping?

        Rick S.

--
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James P Crombie

Summerside                   Machinist
Prince Edward Island         Amateur Astronomer
Canada                       3D Designer

E-mail                       jpcrombie{at}pei.eastlink.ca">mailto:jpcrombie{at}pei.eastlink.ca">jpcrombie{at}pei.eastlink.ca
Astronomy webpage            http://users.eastlink.ca/~jpcrombie" target="new">http://users.eastlink.ca/~jpcrombie">http://users.eastlink.ca/~jpcrombie/">http://users.eastlink.ca/~jpcrombie
/
Rhinoceros 3D webpage        http://users.eastlink.ca/~jpc" target="new">http://users.eastlink.ca/~jpc">http://users.eastlink.ca/~jpcrombie/rhino/">http://users.eastlink.ca/~jpc
rombie/rhino/
Mirror Grinder page          http://users.eastlink.ca/~jpcr" target="new">http://users.eastlink.ca/~jpcr">http://users.eastlink.ca/~jpcrombie/pics/">http://users.eastlink.ca/~jpcr
ombie/pics/
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