It appears that you are using "post-formed" countertop material.

http://homedepot.com.mx/hdmx/esmx/index.shtml

This is available from LOWES and Home Depot to order and in sections with
the 45 already cut (fewer colors available but left and right pieces in
stock).

Best bet is to order sections from Lowes/HD and order a SCRIBE Back (excess
laminate to allow scribing to walls which are not as square as they can make
the counter top.

HD Used to send a guy out to measure for $30 and credit same to the cost of
the counter top ordered (so "Measure" was free) and would warranty a fit!

Granted, this is usually a more expensive route, but if you are sure you can
screw it up as you have proven so far) it may prove cheaper for you to get a
semi-custom counter top this way.



"SammyBar" wrote in message
reenews.net...
Hi all,

Yesterday I tried to put the new melamine countertop (Kober) to my kitchen
with awful results: I should buy a new one and redo everything. The
principal problem was to cut the 45degree to make the two pieces to meet
in the vertice of the "L" I could not make the two pieces to join in an
acceptable (not only for my wife but for myself) way. After recutting and
strightening both angled cuts some times I ended with one of the pieces
shorter than planned for more than 2 inches, but the worse of all was that
the length of the two cuts were different. I mean when you try to align
the two pieces in the "L" vertex, if you make the front of the counter to
match, then the back of one of the pieces was longer by a half inch than
the other piece. My answer is the angle is not 45 degree exactly. One of
the pieces have an angle greather than the other. Even I make both to get
aligned, the difference in angle makes one of the cuts to be longer than
the other. To make the things worse (or better?) I make an error cutting
the sink so I should throw away one of the pieces. Then I'm facing the
same problem for the next weekend: How to cut a perfect 45 angle for the
countertop?
The available tools a a circular saw, a jigsaw, a small 1hp router, a
miter saw. I marked the 45 degree by using a scholar rule (such that have
the shape of a rectangle triangle, sorry, I don't know how to spell this
in english) Then I fixed a fence to the bottom side of the counter and
make the first cut with the circular saw. There where many problems: The
bottom side of the counter is not flat. It has a protuberance at the
leading edge. Other problem is the trailing edge that forms the back of
thr counter is too high to be cutted by the circular saw so I should
finish the cut with a hand saw. Other problem I identify is that after
make the angled cut I made the other side cuts (I mean the stright angle
cuts) on the other extreme of the pieces. I wanted to test the angled cuts
by putting the pieces right over the base cabinets, and to do that I
needed to size both pieces to fit into the kitchen. It was an error: The
angled cuts were not good enought to fit on the first shoot, so I needed
to recut and restright resulting in shortening the length of both pieces.
My plan for the next attempt is to make a replica of the angled walls of
the kitchen. Then first cut the 45 degrees angles and redo that cut up to
fit. Then after that cut both pieces to the right length. To cut the 45
degrees may be I use the mitter saw. Just to be able to cut the extra
height of the counter back, and to mark the right angle for cutting the
rest with the circular saw or by using first the jigsaw and strighten
after that with the router. Other ideas?

Any suggestion for well doing this job is welcomed.
Thanks for your patience for reading this looooooong post
Sammy