I understand the principle. If the pre-headed side is soldered, though, then the other side can be soldered without the rivet falling out, right? Unless you and I are just in violent agreement, and saying the same thing with different words that neither understand.
Donald.
----- "sailingto" <
sailingtoo@...> wrote:
> Yep, the press is "something" like that, operates on the same
> principle. The other side "must" be upset to some extend other wise
> when you solder from other side the rivet would fall out same as a
> wire inserted thru hole. The rivet needs to be upset sufficient to
> hold in place while soldering.
>
> Does that make sense?
>
> ken H>
>
> --- In Homebrew_PCBs@yahoogroups.com, Donald H Locker <dhlocker@...>
> wrote:
> >
> > You wouldn't _have_ to upset the rivet. Insert rivet, solder head
> side, invert board, solder tails, pick up rivets whose heads weren't
> soldered, repeat. I do know that you wouldn't get the stability that
> the double head would give you doing this, but it might be OK for low
> volume, non-critical boards. For volume or critical, THP is the only
> way to go.
> >
> > I was surprised at the size of the head of those 0.4mm rivets. I
> wouldn't have thought that much head was necessary or desirable. But
> I don't know anything about this process.
> >
> > Donald.
> > ----- "Philip Pemberton" <ygroups@...> wrote:
> >
> > > sailingto wrote:
> > > > Phil, I have used rivets very similar to those in the .8mm
> size.
> > > The
> > > > tool I have is a Panapress with the punches - they work nice
> > > indeed.
> > > > High density would be a problem. My use is normally for via
> from
> > > one
> > > > side of board to other and my boards are NOT dense.
> > >
> > > I take it you mean something more like this?
> > >
> > > http://www.megauk.com/through_hole_rivets.php
> > >
> > > The drill sizes seem a little more reasonable (0.8mm rivet needs
> 1.0mm
> > >
> > > hole, and there's a 0.4->0.6mm rivet for finer pitch work), as do
> the
> > >
> > > prices (about £25 for a pack of a thousand rivets, about 1/10th
> of the
> > >
> > > price of the CIF parts). Problem is the tooling is much more
> > > expensive... £250 for the press, then £91 for each die set (one
> > > required
> > > for each size). Ugh.
> > >
> > > Think I'll stick with wire-wrap wire, the 0.5mm drill bit and a
> needle
> > >
> > > file for now...
> > >
> > > --
> > > Phil.
> > > ygroups@...
> > > http://www.philpem.me.uk/
> > >
> >
>
>
>
>
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