Re: [gingery_machines] new article available: Drill, Tap, and Counterbore

 

Hi Rick

Yes! A bit on the high end though...gradually one can achieve it.
I still remember once I asked a trainer to show me how to hand grind
the twist drill, he refused...that was 30 years ago in my school days.

I made my own tool and cutter jig not only able to sharpen end mills
and able to sharpen twist drills the Tormek method, getting the 4
facet faces. After tested it, it's very wear resistance than normal
conical grinding.

Steve-S'pore ;)

On 6/1/11, RG Sparber <rgsparber@aol.com> wrote:
> Steve,
>
> Interesting modification to a drill but IMHO, beyond what a person new to
> the hobby can handle. However, it would make for an interesting new article
> :-))
>
> Rick
>
> -----Original Message-----
> From: gingery_machines@yahoogroups.com
> [mailto:gingery_machines@yahoogroups.com] On Behalf Of Steve Wan
> Sent: Tuesday, May 31, 2011 7:25 PM
> To: gingery_machines@yahoogroups.com
> Subject: Re: [gingery_machines] new article available: Drill, Tap, and
> Counterbore
>
> Hi guys!
>
> Nice info you got there...perhaps Ron is correct not to use mill
> cutters on the spindle chuck. My approach is different, I learnt this
> trick from my training school long ago. I would grind my drill bit
> almost flat. With a 0.5mm normal drill bits slightly bigger, I drill a
> shallow step as a guide and use this flat drill to counterbore and
> c'sink or debur with a hand-drill.
>
> If the c'sunk hole is deep, I would use the ratchet brace like the pdf file.
>
> Steve-S'pore
>
>
>

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