Forum:Hamon, jam breeding machine, and the winged dragon of ra

I was trying to find out if you would be able A) use jam breeding machine for tribute for Hamon and B)summon the winged dragon of Ra while jam breeding machine is active on the field. the reason why i think both are able is because u have to use jam breeding machine as the tribute so it would be taken of the field for Hamon and in Ra's effect it says that his summon cannot be negated. All my friends say that it works but when i put it on yahoo i got mixed answers so maybe someone can clear this up please.