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Well, I've successfully drawn with markers on my new Ostrich Bot, and I'm ready for the real work.
I manage a community college chemistry lab and I bought the Ostrich Bot and diamond engraver so I could automate putting identifying numbers on laboratory glassware. (like Station #1-30) (think Pyrex - this is tough borosilicate glass, a little harder than regular glass) Some laboratory glassware (like a volumetric flask) is quite expensive and I need to track it for student use.
I have previously done this with a vibrating engraver pen, which is effective but sloppy looking. I also have tried to etch numbers on, but there is a (very thin) plastic protective coating on lab glass that resists the hydrofluoric acid based etchants. Sanding or scraping removes the coating but scratches the glass. I have also tried sandblasting the numbers on but that was messy and sloppy looking also.
So here I am with a new toy, which draws well, but I am having trouble engraving. I can barely see what marks the diamond point produces.
In the engraver instructions, three ways are mentioned to adjust the engraving.
#1 "vibration strength" I have cranked the trimpot all the way up and when I just turn on the engraver in a single spot (using manial control) it hops around a bit and draws about a quarter inch line (instead of a single dot). But it does do it fairly dark.
#2 ""speed of engraving" I have tried a pen-down speed of 5-200. Slower is significantly better.
#3 "pressure applied by engraving tool" How do I change this?
Perhaps if I just keep going over the same places? How would you sugget doing that?
Also, how would you recommend filling in the engraved numbers? I need them 1/2" to 1" high.