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| N. Thornton replied to Rod Hewitt on 12 May 2004 |
Well well, I've got it done, and it saves lots of time. What worked
was an old metal grinding grit disc. The diamond just didnt work on
steel, and it turned out the grit disc I'd used before was a stone
one, and almost useless on steel.
Job done!
Regards, NT
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| Pete C replied to N. Thornton on 12 May 2004 |
Did it work out OK grinding a drill bit to a profile, how did you do
it in the end? I was going to suggest using a new metal grinding disk
:^)
cheers,
Pete.
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| N. Thornton replied to Pete C on 13 May 2004 |
Yes, I was just using the wrong grinding discs! With a grit metal
cutting disc it went fine. I use cutting discs as the thin edge is
needed in the flutes, plus the amount of side force on the disc is
only slight.
Re your questions, they appear to be answered by what you quoted, so I
guess I must be misunderstanding something. I used a drill to turn the
bit and an angle grinder to grind it. Ran the drill backwards so it
was the blunt edge of the flutes that hit the disc.
It turns out the bit doesnt perform as well as a factory job, for 2
reasons:
1. The flutes are shallow in the thinner section
2. the angle of the very short tapered section is by no means ideal
3. there is no recessing on the outer edge of the flute section of the
smaller diameter section.
but it works fine, and far faster than swapping bits over all the
time.
Thanks for all your help!
Regards, NT
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Archived message: Re: Making a multiprofile Drill bit (UK D-I-Y Home Renovation)
