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Brass Pulley for My TT

I recently had a machine shop make a Brass pulley for me to try, it is working great but; I am seeing some yellowish dust which I assume is brass. Is this normal? I don't have much knowledge of Brass so I am looking for answers??? Will this stop after a while or not? The belt is made of Mylar.. I have cleaned it off a couple times but it is still producing it...
jsman
8 responses Add your response
jsman OP
246 posts
 
Update:
Turns out it was the belt leaving the residue, kinda weird though none of the belts I used in the past did this... I am thinking maybe because I am near the end of the roll of Mylar had something to do with it?


jsman OP
246 posts
 

Update:

So I had the machine shop make another pulley from SS and wouldn't ya know it , it is also leaving a residue. So now it is either the belt itself or something the shop used on the material I guess???


jsman OP
246 posts
 
Turns out the original pulley was made from brass also...
jsman OP
246 posts
 
invictus005,
Yes I agree my other pulley is made from SS, he told me he would make one from SS if I wanted it. 
invictus005
597 posts
 
Brass is soft and a bad choice for a pulley. The mylar belt may polish a spot and stop, or it may continue to keep cutting it and producing brass powder.

Precision pulleys are made from stainless steel. 
jsman OP
246 posts
 
brf,
I am hoping you are right, that's what I am thinking also. That the shop didn't polish it enough I guess time will tell.
brf
1,715 posts
 
I would hazard a guess that the friction of mylar belt is polishing the brass, therefore, leaving a slight residue.  This is not a bad sign as the smoother the brass surface becomes, the better molecular adhesion. 
bdp24's avatar
bdp24
9,788 posts
 
Cymbals are made of brass, as are saxes, etc. Brass oxidizes, which is why cymbals become tarnished. Not a good material for a pulley, imo. You could have it chrome plated, I suppose.
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