[ATM] 4" Pyrex, back after 10 years of gathering dust

[Richard Schwartz]

See a Catholic bible, Ecclesiastcus 13:1.  Verse 2 seems to warn  
against a mirror project that is too large.

Sent from Richard's iPhone

On Oct 30, 2009, at 11:10, "Berthold Hamburger" <b- 
hamburger at artinso.com> wrote:

> Richard,
>
> If you use black pitch, you have to use a black sharpie pen AND  
> paint the
> lap and not the mirror.
> If you use burgundy pitch, you have to use a burgundy sharpie pen  
> and paint
> the light bulb illuminating the mirror.
> If you use green pitch, you must use - you guessed it - a green  
> sharpie pen
> and paint your nose, wear a skirt and perform a rain dance before  
> pressing
> the lap in your pressure cooker.
>
> Let me know if it works!
>
> Berthold
>
> -- 
> Berthold Hamburger - Cellist/Spain
> Email: behambu at artinso.com
> http://www.artinso.com
> http://www.astro.artinso.com
>
>> -----Original Message-----
>> From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On  
>> Behalf
>> Of Richard Schwartz
>> Sent: viernes, 30 de octubre de 2009 6:16
>> To: Scope Builder
>> Cc: <atm at atmlist.net>
>> Subject: Re: [ATM] 4" Pyrex, back after 10 years of gathering dust
>>
>> I have been polishing for a whole hour on this 12", but cannot  
>> correct
>> the figure-- a badly pitted deep central area surrounded by glass  
>> that
>> is not ground at all.  I cant get the tester to work at all.  I tried
>> to measure the focal length by wetting the mirror, but could not  
>> focus
>> the sun at all.  At least the sagitta is correct.
>>
>> Does the Sharpie test wrok on a pitch lap, and does it correct my
>> figure?  How do enter Sharpie test data into Sixtests software?
>>
>>
>> Sent from Richard's iPhone
>>
>> On Oct 29, 2009, at 13:35, "Scope Builder" <scopebuilder at gmail.com>
>> wrote:
>>
>>> ----- Original Message ----- From: "Francis J. O'Reilly"
>> <foreilly at verizon.net
>>>>
>>>> I never test figure until I am finished polishing. The pencil test,
>>>> sharpie test and other tests seem to be a waste of time to me.
>>>
>>>
>>>
>>> Hi, Francis.
>>>
>>> At your level of experience, I'd agree with you about not worrying
>>> about the
>>> figure prior to polishing.
>>>
>>> But.... ;-)
>>>
>>> In assisting with instruction at mirror classes over the last few
>>> years,
>>> I've found that tests like the sharpie test give a novice mirror
>>> maker a
>>> quick and simple method to get positive feedback that they are doing
>>> ok.
>>> It's an incredible anxiety mill for a lot of newbie mirror makers to
>>> work
>>> for hours and hours without knowing whether things are going well or
>>> not.
>>>
>>> For newbies, 2 minutes of sharpie test can remove hours of potential
>>> anxiety
>>> which could cause the mirror maker to start second guessing things
>>> they
>>> might be doing correctly.  They will know that they are doing ok, or
>>> they
>>> will know that they need to do something different.  Either way,
>>> that simple
>>> answer is good to them.  Not perfect... but good. ;-)
>>>
>>> In my opinion... if anyone out there prefers to do sharpie or pencil
>>> tests... Go For It!!!
>>>
>>> We, as advice-givers, should never snub the small stuff.  Those are
>>> often
>>> the tools that build the confidence needed for many to persevere and
>>> get
>>> their mirrors done!  And *that* is the ultimate goal.
>>>
>>> - Dave
>>> _______________________________________________
>>> ATM mailing list http://www.atmlist.net/
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