1. I have just got hold of some engraving bits, a gift to me from a friend

    There are two types, 0.2mm 30degree angle and 01.mm 90degree angle.

    Question is - what is the suitable use for these?

    My guess is the 90deg ones are only for very shallow cuts but the long 30deg ones? Very shallow cuts?

    Both are solid carbide, I got 10 of each.

    I could find uses if they are indeed suitable for engraving stuff

  2. #2
    3mm shank? They are good for fine engraving, and as you suspect shallow cuts, for aluminium I run them at 28800rpm with air for cooling and to clear chips with the occasional squirt of lube.
    I use HSM advisor for feeds & speeds, the carbide points aren't in the least bit forgiving if you plough in a bit deep or don't have the rpm to keep the chips thin enough,

    - Nick

  3. #3
    IMHO best all around bit for engraving is 60 degree, i prefer it on 1/4 shank.

    The 90 degree are good for cuts for folding say Dibond or other materials. Not very useful on signs.

    The 30 degree are best for jewelry and most of all for small stamps and very small signs. This is a very needed bit, but its very breakable. Any small mistake and snap..., not good for wood though and easily melting plastics.
    project 1 , 2, Dust Shoe ...

  4. Yes 3mm shank, so it seems they are not that useful after all.

    Need to look for some 60degree 1/4 shank ones?

  5. #5
    Horses for courses, what you want to engrave will determine the angle, OD and tip size,

    - Nick

  6. Good point - no idea at present ;)

    I guess in future, aluminium, plastics, brass.

    What sort is best to look out for?

  7. #7
    Quote Originally Posted by Davek0974 View Post
    Yes 3mm shank, so it seems they are not that useful after all.

    Need to look for some 60degree 1/4 shank ones?

    But 30 degree bits are usefull, it does not matter that they are 3mm. I would say even better, because it's one thing to brake a 3 euro 1/8 bit and another 15euro 1/4.

    That's my all time favourite 60 degrees, 1/4 bit. solid carbide, Kyocera and only 5 euro, ebay item 151942760125. No to speak of that it could be sharpened 100 times if you have a grinder, i pay to a guy here locally 2 euro each time to grind it fresh. When i am lazy i use it for final slot cut, instead of changing bits

    Click image for larger version. 

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    project 1 , 2, Dust Shoe ...

  8. #8
    Quote Originally Posted by Boyan Silyavski View Post
    But 30 degree bits are usefull, it does not matter that they are 3mm. I would say even better, because it's one thing to brake a 3 euro 1/8 bit and another 15euro 1/4.
    I'm really careful with my Nine9 engraving tool inserts ;-)

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