Perfuração de cilindro

Alguém pode me ajudar? tenho um cilindro no sketchUp com 30 metros de largura e 2,30 de espessura… Eu quero abrir um buraco nele com um meio circulo de 5 metros de comprimento e 2,30 metros de altura! Mas ta complicado por causa das arestas do cilindro… Não estou conseguindo de jeito nenhum

From Google Translate:

Can someone help me? I have a cylinder on the sketchUp that is 30 meters wide and 2.30 meters thick… I want to open a hole in it with a half circle 5 meters long and 2.30 meters high! But it’s complicated because of the cylinder edges… I’m not getting it at all

Can you share the .skp file so we can see exactly what you are trying to do?

Please help us help you. Your profile indicates you are using a Sketchup version that does not exist. What version are you really using? Please correct your profile.