My current project to build a Class 325 Royal Mail EMU (http://www.rmweb.co....__fromsearch__1) requires some scratch-built detailing parts which I would like to etch from brass sheet. These small parts don't justify a large amount of effort or cost, so I decided to try a method which didn't involve teaching myself to use a CAD package or paying a specialist firm to do the etching. I was inspired by Nigel Lawton's online guide (http://www.nigellawt...s_Version_5.htm) which makes it all sound very achievable - in fact I have shamelessly copied Mr. Lawton's method and make no claims for originality of the ideas!
I will attempt through this thread to briefly illustrate the process I have followed, rightly or wrongly; for full details of how to do it properly, please see the above website. Basically:
Design the artwork on the computer using bog-standard Microsoft Office software*
Print a mirror image of the artwork onto overhead projection acetate sheet, using a laser printer
Use a domestic iron to transfer the toner pattern from the acetate onto the brass sheet
Submerge the brass sheet into some ferric chloride (a corrosive chemical) until the exposed brass is etched away but the parts protected by toner remain intact.
...and that's it! This method is a bit 'rough and ready', but it is more affordable than professional photo-etching because it misses out the photo-development of the etch resist and doesn't need any specialist equipment.
Cheers,
Will
* I know that some CAD users will wince at the idea, and having struggled with some of the MS drawing tools I can understand why, but for all their limitations they are at least familiar to me - learning to use a CAD package would take me longer than the whole process above.