Hi Gabe,
Flirting with the edge of being on topic; I think you are confusing it with Dye-Chem High Spot Marking Paste.
I think that the lay-out dye you are thinking of has a paint brush integrated into the lid. You brush it on a piece of metal, let it dry
and then scribe layout lines on the surface.
The paste is usually applied with a brayer. It never dries. It is used to indicate the points of contact between two surfaces. You apply the paste to one surface and then touch the two parts together.
Little spots of blue appear on the non blued part at the points of contact. The most common application is in machine work when scraping
way surfaces. The scraper hand defines the bearing that he creates in
terms of points of contact per square inch.
I've fitted quite a few crank cotters (probably hundreds) with good results but I never considered using High-Spot to evaluate the fit up. Maybe I'm missing something, but I would imagine that it is hard to get a good reading. It is similar to scraping in a tapered jib on a machine tool. The paste smears as you slide the parts together.
Regards, Jamie
Jamie Swan Cell - 516-238-6782 Centerport Cycles Inc. 245 Main St. Northport, N.Y., U.S.A. 11768 631-262-0909 http://www.centerportcycles.com (mapped) http://www.cabinfeverauctions.com http://www.cabinfeverexpo.com http://www.limws.org http://www.liatca.org
On Jan 28, 2007, at 6:07 PM, gabriel l romeu wrote:
> 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/
>
>> 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 ±