How do you cut a double D hole with one of those?
Jim, AF6O
> 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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