"Toller" wrote in message
...

Seems you have a problem with biscuit size, or your plate joiner's depth
of
cut ... you need to figure out which because this gap business shouldn't
be
happening.

I have done a thousand biscuits (PC joiner/PC Biscuit) with no problem,
but they were all 90 degrees. I think the clamping was adequate to bring
them together. Since clamping is at an angle to the biscuit on 45s, it
just isn't enough.
But making the cut a bit deeper for all biscuits would probably be
prudent.

Keep in mind that the 90 degree angle does not require a deeper cut for the
biscuit than any other application of the biscuit. If you find that the
holes are too shallow on the 45's you may not be holding the joiner
perfectly perpendicular to the miter glue surface. You should insure that
you joiner is indeed tilted to the same degree as the miter cut to insure
that the biscuit is 90 degrees to the surface that it protrudes from.

Also band clamps work VERY well when clamping a container that fully closes
on all sides and again insure that your parallel sides are equal in length.