Hello,
You need to look into a surface coating if you want to make this last. NiTuff is a hard coat - Teflon impregnated surface coating I use quite often when dealing with Aluminum. It gives the aluminum a 60 to 70 on Rockwell C scale hardness. They have shops all over the country that do the treatment. It is cheap for the most part and I highly recommend them. I have been using them (Nimet Industries Inc.) and you can find them and the specifics on the internet.
The aluminum on Bronze will not hold up. If this machine setup will not be a production machine you will get some life out of the aluminum. The good thing about Nituff, is the Teflon impregnation, it will wear out the bearing before any wear shows on the aluminum shaft. Trust me on this one, you will thank me!
Good Luck,
Glen |