Ron using the end mill as a counterbore is not the best idea anyway, unless you start with a drill the same size first. this will keep the endmill from chattering at the start of the cut. a piloted counterbore is best. if using this type of cutter a drill chuck is fine. end mills used for milling operations should not be used in a drill chuck because of vibration. Learned from expierence. and don't use a fly cutter, in a drill chuck either. ouch!!
--- In gingery_machines@yahoogroups.com, Ron Thompson <ron@...> wrote:
>
> On 5/31/2011 7:24 PM, RG Sparber wrote:
> >
> > This is another article in my series for people new to our hobby. It deals
> > with drilling, tapping, and counterboring a hole for a Socket Head Cap
> > Screw
> > using the technique called match drilling.
> >
> > If you are interested, please see
> >
> > http://rick.sparber.org/dtc.pdf
> >
> > Comments and questions are welcome. All of us are smarter than any one of
> > us.
> >
> > Rick.
> >
> Nicely done. One small criticism.
>
> <soapbox>
> End mills should not be held in drill chucks. I know, everyone does it.
> But your articles are aimed at newbies.
>
> End mills are as hard or harder than the drill chuck jaws. This can and
> does do damage, especially if it slips.
>
> The right tool for this operation/in this machine/ is a piloted
> counterbore. They have the advantage of a ofter shaft and a removable
> cutter. This is handy for reverse counterbores where the tool is pulled
> into the work from the opposite side.
>
> On the other hand, if the machine you were using was a mill, and it had
> the right holder for the endmill, your operations would be appropriate.
> </soapbox>
>
> Now I'll quit being anal.
>
> --
>
>
> Ron Thompson
> On the Beautiful Florida Space Coast, right beside the Kennedy Space Center, USA
>
> There are two kinds of posts on newsgroups.
> 1. This is what I have done...
> 2. This is what I think...
> Be aware of the difference!
>
> http://www.ourcadguy.com/
>
> http://www.plansandprojects.com My hobby pages are here:
> http://www.plansandprojects.com/My%20Machines/
>
> Visit the castinghobby FAQ:
> http://castinghobbyfaq.bareboogerhost.com/
>
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
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