[Public-List] Public-List Digest, Vol 3148, Issue 2

[Wes Gardner via Public-List]

Hi All,

If you are anywhere near my area (Severna Park, Maryland) I'd be happy to
drill your chainplates for you.

Wes

On Mon, Nov 9, 2015 at 12:24 AM, Glenn Brooks via Public-List <
public-list at lists.alberg30.org> wrote:

> Gordon,
>
> Ideal would be to use tungsten or carbide tipped bits.  Depending on what
> grade stainless, you have, you might get by with a high quality high speed
> steel (HSS) bit, if you drill slowly, say 250 to 400 RPM or thereabouts.
> these will dull quickly, but might work for enlarging existing 1/4" holes.
>   Other wise look for a tungsten or carbide bit.
>
> It's Critical that you clamp the chain plate to a drill press table to
> control the work as you drill through it, particularly the last little
> bit.  preferably use a drill press so you can turn down the speed (RPM) of
> the bit.  A hand drill just won't do it.  They turn to fast.  If bit speed
> is to fast, for example, over 800 -900 RPM, the bit will likely heat   up
> quickly and loose its hardness. If the tip turns bright red then  it won't
> cut and will work harden the Stainless by grinding/rubbing against the
> hole.  Work hardened stainless can almost never be drilled thereafter. So
> be careful not to work harden your work surface.
>
> Also, always use some cutting oil - even 3in 1oil if nothing else is at
> hand.  The cutting oil will help dissipate heat and make all the difference
> in the world getting through the chainplate.
>
> Regards
> Glenn
>
> Sent from my iPad
>
> > On Nov 8, 2015, at 3:16 PM, gordon white via Public-List <
> public-list at lists.alberg30.org> wrote:
> >
> > what drill is good for use on the stainless chainplates?
> >
> > - Gordon White
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