Electronics > Projects, Designs, and Technical Stuff

Stainless Steel Electrochemical Machining "CURRENT DENSITY" - Includes Gift!

<< < (4/4)

Victor Ramon:

--- Quote from: duak on April 25, 2020, 05:57:27 pm ---I remember a lecture by one of the chemists from one of our large customers.  The chemistry of ink is complex and interesting - so many conflicting requirements like viscosity, miscibility, drying time, toxicity, etc. (Attachment Link)

--- End quote ---

Oh yes, I remember my days when working with printing inks. The formulations are very sophisticated. Paint and ink are definitely not the same. One takes hours to dry while the other dries in a matter of seconds. Why?????!!!!!  :scared:  That's what got me into ink formulations way back. The photo is from the legendary "The Printing Ink Manual", the chapter about gravure inks and its sophisticated priting rollers. Right off the bat gravure is one of the most difficult and elegant and beautiful quality printing technologies. It's what money paper is printed with in the first place. Offset and flexography are for packaging, magazines, advertising and other garbage.

Cheers

duak:
Victor, I think the reason for the ink to dry quickly is to prevent smearing as the paper web passes through the remainder of the printing press and the next colors are added.  In the halftone process, the ink is applied in small dots of varying sizes to change the density.  The different ink colors must not mix otherwise the color tint will change.  Lithography printing works at certain speeds - not too fast or too slow.  I remember about one or two meters per second.  It is a miracle to me that it works as well as it does.

Best Wishes,

StuartA:

--- Quote from: Ground_Loop on April 25, 2020, 02:35:06 am ---,and I thought alumina reduction was  he most power hungry electrochemical process.  Anyway, if you want to carve stainless with electricity how about a good CNC EDM rig?  Wire or plunge, they both work well and are great fun to work with.

--- End quote ---

I recall taking a component to be sectioned for failure analysis to a local EDM specialist and watching the work being done - really impressive! You have this very powerful spark going on to the work piece, which is completely immersed in paraffin. This was over 20 years ago, and I cannot recall the make of the machine which was used.

I did a little bit or work on electropolishing stainless; it greatly reduces the surface roughness and improves the passivity. At the time I worked on that it really seemed to be a "Black Art", but these days they seem to able to polish even internal surfaces of tanks and pipes quite routinely.

Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod