good quality 20 degree engraving bits

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  1. #1
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    Default good quality 20 degree engraving bits

    Guys, title says it all - the cheapo Chinese 20 degree bits all have the tips break off no matter what speeds or feeds, even on soft materials. I need 1/8" bits that will keep their point, my objective is to engrave PCB's so they have to be fine.

    Can anyone recommend any brand / dealer?

    Cheers

    Les

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  2. #2
    Member Jim Dawson's Avatar
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    Default Re: good quality 20 degree engraving bits

    Try these guys. https://bitsbits.com/ I buy from them and have had good luck with their products.

    Jim Dawson
    Sandy, Oregon, USA


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    Member Chris D's Avatar
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    Default Re: good quality 20 degree engraving bits

    Here is one that I have been using with good results...

    https://www.precisebits.com/

    Chris D



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    Default Re: good quality 20 degree engraving bits

    I have used PreciseBits trace isolation cutters in the past, and they definitely work well. But:

    If your current setup is breaking the tips off $1 Chinese cutters, then your $15 PreciseBits cutter will break just as quick. Unless you correct the problem, you will simply be throwing money away 15 times faster than you were before.



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    Default Re: good quality 20 degree engraving bits

    I'm open to any suggestions as to how to stop it happening - I am using very light feeds and cuts (400mm/min, 0.02mm depth increments), and the cutter RPM is the max that my setup can do (about 6500 RPM)

    If you can give me any advice on prevention I am all ears.

    Thanks for the replies and assistance

    Les



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    Default Re: good quality 20 degree engraving bits

    Here is what works for me with Chinese V-cutters.

    - I use 30-degree and 45-degree tools. 15-degree cutters are way too fragile, and they do not give you any advantage in cut width.
    - I use 10 000 RPM, 200 mm/min feed rate and 100 mm/min plunge rate (so the chip size is 3 times smaller than yours). My machine is not very rigid, so I have to cut much slower than what you see in YouTube videos with real PCB prototyping machines.
    - I cut the copper in one pass (0.05mm depth). Trying to do it in several shallow passes just makes the tool rub the copper surface instead of cutting it.
    - Bed levelling is critical.
    - Even with a perfect bed, actual PCBs are not 100% flat, so I use Autoleveller to level the g-code.
    - Tool runout is critical. If your spindle has any significant runout, tools will just keep breaking.



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    Default Re: good quality 20 degree engraving bits

    Thanks for the tips.

    I have to say that I will have to get a handle on the bed levelling, Universal Gcode sender can do it but I haven't worked out how yet.

    Cheers

    Les



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