Am I making this noodle correctly? I decided to make pad thai noodles from scratch.  The recipe I found for rice noodles said to let the rice soak overnight then grind the resulting mixture in a blender.  After that it called for steaming the batter in small batches then slicing into noodles.  The problem that I had is that these noodles did not cook up in my wok correctly.  They got extremely gummy and were grainy.

I have experience with pasta, but I have no idea where I went wrong with such a simple recipe.  Anybody have any ideas on how I can fix this? 

EDIT: the recipe was this
1 1/4 cup rice
1 1/4 cup water
oil to coat steamer tray

Place rice in water overnight, blend until smooth (smoother better than not), ladle into oiled steamer pan one ladle full every five minutes, remove noodle sheets and slice noodles.
A difference I see between your recipe and other alternatives is that you don't have any other starch besides your rice.  Other recipes include a good amount of tapioca or potato starch.  The other difference was that other recipes used rice flour instead of rice.

You might also want to consider a change in technique.  You can make rice noodles like a crepe rather than in an oiled steamer pan.  Simply use a non-stick or oiled crepe pan, put in batter to crepe thickness, and let it cook until it begins to pull away from the edge of the pan.  Invert and release in one motion onto a cutting board and slice.