An annular cutter is quicker and smoother...
http://www.blairequipment.com/Rotabroach_Cutters/rota_cutters.html
A small fractional set can be had on Epay for ~$70...very handy shop tool!
Mike K4EAR
-------------- Original message ----------------------
From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
> Michael E Fox (N6MEF) wrote:
> > I'm looking for what's called a "double-D" punch that is the correct size
> > for N-type connectors. This will be used to punch holes in bulkheads for
> > installing either PolyPhaser DSXL lightening arrestors or N-type Amphenol
> > bulkhead pass-through connectors.
> >
> I normally use Greenlee "knockout punches". The latest style split the
> piece knocked out into two haves that look like the letter "D", but I've
> never seen them called "double D".
>
> OTOH material for bulkheads is normally thick enough I just use a drill
> bit of the proper size, be it in steel or aluminum. IOW it's a rather
> small hole and punches for that size use a relatively small through bolt
> (bout 1/4" to 5/16") that can be broken trying to punch holes in 1/8" to
> 1/4" thick, Aluminum, Copper, or steel. I've busted the bolts on chassis
> punches for tube sockets, let alone this size and thickness. Drill the
> hole undersize, then work up to the proper size one drill at a time.
> This gives a hole with relatively clean and smooth sides however don't
> forget to debur the inside and outside. BTW the hole for the through
> bolt on most of the punches is as large or larger than the bulkhead
> connectors for N or UHF. (Same size IIRC)
>
> 73
>
> Roger (K8RI)
> >
> >
> > Greenlee doesn't make a double-D that is small enough and I'm having
> > difficulty finding the right size anywhere.
> >
> >
> >
> > This must exist somewhere. Anyone know where to find one?
> >
> >
> >
> > FYI - if you don't know what I'm talking about, then Google "double-d
> > punch". You will find many out there, most notably Greenlee. But I haven't
> > found any that have the right dimensions for a standard N-connector.
> >
> >
> >
> > Regards,
> >
> > Michael / N6MEF
> >
> >
> >
> >
> >
> >
> >
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> >
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