You said: From: "PeteH"> Sent: Thursday, July 15, 2004 8:01 PM Subject: Re: What grade material to use?
>the info on the alu. bronze, I wondered why it wasn't used more often! I suppose it > would be good for bearing material? PeteH, That's a no no. Aluminum bronze should not be used as bearing material. It has a poor coefficient of friction when used with hard or soft shafts. This bronze, if made correctly, is difficult to machine. It's supposed to have 9% to 11% Al. in it. It has a hardness of about 280 to 320 BHN. Ordinary cold rolled has a hardness of about 190 BHN. For bearing service you need a bronze that has lead in it like SAE 94. I can't find that specification in my latest hand book so they might have changed the number. You have to have a higher lead content in the bronze for it to work well as a bearing. Arthur--Mexico City
