Engraving Accurate Scale On 1/8" Steel Bar?

[EmilioG]

I would like to engrave a scale on my Starrett C182's protractor to 64's as accurately
as possible. Can I blacken the engraved marks? How can I do this? I want to use the protractor to gage drills during grinding/sharpening. Thanks

 

[chips&more]

Do you mean to put grads on the bar part? How about you modify a regular scale to fit the head with the deg marks. Or, attach a scale onto the bar…Dave.

 

[EmilioG]

Yes, put the grads on the bar. That's a good idea, machining a scale to the same shape and the
hole size. If I can find a scale of the same thickness, maybe I can modify it, but I would like to know
how to engrave the stock Starrett bar also.

 

[Cobra]

Is the Starett hardened?

 

[EmilioG]

No. Satin finish steel.

 

[Cobra]

Can you set it up in the mill and use a 60 degree lathe tool to mark the scale, using the table to calibrate.

 

[EmilioG]

I'll copying the Starrett protractor bar and bluing and scribing the lines then engrave them
on the mill. Can a scale image be lasered or silk screened on the metal? or a clear image
of a 64th grad scale be glued on? A clear plastic transfer?

 

[Cobra]

It can certainly be laser etched if you have a shop that will do it for you.

 

[British Steel]

An aerosol of PCB etch-resist and laser / inkjet print a transparency drawn in CAD, then UV expose, develop and etch the graduations with e.g. ferric chloride?