No. 80 bits - good source?

[Schraddel]

Used to buy numbered bits by the boxes for drilling circuit boards. They were carbide and would stay sharp where other's wouldn't. Big issue is that they all had 1/8" shanks and would fit in a Dremel and they would frequently break right where they shank changed sizes if the tool wasn't fixed in Dremel drill press. Beware of those for anything other than drilling PC boards.

Don,

as you said, these type of drill bit is only for machine use. Meaning they are chucked in a drill which is mounted onto a drill press:



So it is warranted the forces during the drilling process will take effect only vertical. Then they last and you are able to drill into other materials than circuit boards. But remember they are for the fine job.

Attempts of drilling with these bits chucked in a handheld machine will destroy them dependable. Main cause is canting and because of the very short lenght of the actual drill bit and in context that the hard carbide is not flexible, they going for flying around your ears.


Lutz