On this kitchen project the client does not want an upper corner at an angle so just 90 corner. I wonder what is the better door opening option for that ? I seen some with doors hinges on both gables , not sure how practical that is ...?

I'm not sure what you mean when you say "gable." Assuming you are talking about a Pie Cut upper corner cabinet, hinge one door to one side and hinge the other door to that door with Pie Cut corner hinges. If you try to hinge one door on each cabinet side, you will probably have a problem with the handles hitting in the corner.

I do it just like Paul described. The same way I do base kidney susan doors.
170 degree hinge from door to cabinet and a 65 degree bifold hinge from door to door. Just be sure to only bore the door that attaches to the cabinet for both sets of hinges, the other door only gets 0 mm mounting plates.

Paul
In Canada gable=end

Alan F. Thanks for clearing that up, I was afraid Alain was putting cabinets and doors on the roof, lol!

Here is a pic of a corner cabinet with the pie cut hinge

View higher quality, full size image (1434 X 1920)

ok well I guess I will do that .

you right Paul I did not think of the handle if the doors are hinged on both gables end ...I did see that in a picture somewhere .

I would make sure you countersink the screw heads that hold the knob or handle on. I have seen many who don't and the cabinet door next to the corner cabinet can get a nice scrape mark when someone closes the door and it rubs on the door next to the corner cabinet.

nicko