Re: [CR]Re: Blue Cotterpins, was Cotterpin Blues

(Example: Framebuilders:Tony Beek)

Date: Sun, 28 Jan 2007 18:07:11 -0500
From: "gabriel l romeu" <romeug@comcast.net>
To: Aldo Ross <aldoross4@siscom.net>
Subject: Re: [CR]Re: Blue Cotterpins, was Cotterpin Blues
References: <BAY115-F32C05E768ED34EF0724FB4BFA00@phx.gbl> <002a01c74313$dc649f50$8217fbd1@Newhouse>
In-Reply-To: <002a01c74313$dc649f50$8217fbd1@Newhouse>
cc: classicrendezvous@bikelist.org

I previously used this blue solution for most of my machining until i found how much more convenient it was to snap a cap off a perm. felt tip

marker. the bluing solution used to have a bottle with a screw cap and a brush attached.

Now there are retractable felt tip pens (like the old ball points) which

are even more convenient. Personally, unless using the pooling ability of the engineer's blue (bring down a cutter without touching the work), I would see it as a bit archaic.

I never heard of the prussian blue oil paint sustitution, the advantage of the original solution was that it dried quite quickly (and smells quite different due to it's solvent), not an attribute of oil paint. Also, the oil paint pigment is not 'smooth'. when you add a fair amount of glazing medium (or thinner) there it is composed of little different sized 'bits'. fairly close color match however, i see a teense more red

in the paint...


> Neil Foddering wrote: "I know a couple of guys who use engineers blue ( I
> think it's called) to show up high spots for more accurate filing."
>
> Another product machinist's use is "High Spot Blue Marking Paste", aka
> "Prussian Blue". Here's a sample of a UK source for this type of produ ct:
>
> http://www.maintechmro.com/product.php?productid=294&cat=0&page=1
>
> It's also available in the USA:
>
> http://www.mcmaster.com/
>
> (Enter item number 6165K11 in the search window.)
>
> Some guys use actual Prussian Blue artist's oil paint. Cheaper, easier
> to find in craft or art stores, and supposedly the identical product.

--
gabriel l romeu
chesterfield nj usa
± http://studiofurniture.com Ø http://journalphoto.org ±