Re: [ATM] Comment on Crayford construction

[J H M van Gastel <jhm.vangastel@wanadoo.nl>]

On the positive side: they are easy to make by ATM and relatively inexpensive, as compared to the (very nice looking and without any doubt very well functioning) focusers on your website. And I never had any problem with my selfmade Crayfords (see http://home.wanadoo.nl/jhm.vangastel/Astronomy/tridob/tridob.htm#focuser ). 

Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/







> Datum: 19/11/07 06:16 AM
> Van: "Don Clement" 
> Aan: "ATM List" 
> CC: 
> Onderwerp : Re: [ATM] Comment on Crayford construction
> 
> 
> 
> > flexural bearings are in every load speaker
> > and every telephone.
> >
> > And, I would hesitate to mention, every shark.
> 
> But not in a Crayford which uses sliding or rolling bearings in some form
> with the associated susceptibility to dew, dirt, grit contamination,
> dependence on lubrication, and parts that wear over time.
> 
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> 



Jan van Gastel


http://home.wanadoo.nl/jhm.vangastel/Astronomy/
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