Dark Patchey Spoty Blochy

[clayboyrat]

I've been doing this for 2 years now. Am no pro. But I have put out a lot of parts in that time frame. Thought I had it. Until now. I've got a wheel hub to a 1956 sears Allstate 175cc motorcycle. Now it was pretty rough when I started. Rough enough to start with 180. then down the road. 220,400.600. Hit it one time on the wheel with Emery,red and then white. Seemed a Little blotchy and I saw some 180 scratches in it. So back to 101 motorcycle buffing. I re sanded using my palm sander. I didn't think I needed to go back to 180. I started with 320 and up to 600. went back to the wheel and hit it with emery again and the blotches came out more. I can tell just by looking at it that its no use to go any farther.I have done this 3 times and its not getting any better.What do you think is my problem? and what should I do.

[mpierich]

Originally Posted by clayboyrat

I've been doing this for 2 years now. Am no pro. But I have put out a lot of parts in that time frame. Thought I had it. Until now. I've got a wheel hub to a 1956 sears Allstate 175cc motorcycle. Now it was pretty rough when I started. Rough enough to start with 180. then down the road. 220,400.600. Hit it one time on the wheel with Emery,red and then white. Seemed a Little blotchy and I saw some 180 scratches in it. So back to 101 motorcycle buffing. I re sanded using my palm sander. I didn't think I needed to go back to 180. I started with 320 and up to 600. went back to the wheel and hit it with emery again and the blotches came out more. I can tell just by looking at it that its no use to go any farther.I have done this 3 times and its not getting any better.What do you think is my problem? and what should I do.

First off, send me the hub with the rest of the bike attached and I'll get back to you at the end of the summer...

Anywho...only thing I can think of is if they really were 180 scratches you saw, you maybe should have re-started with 220 instead of 320? 180 to 320 is a bit larger gap than preferable, I think.

Other than that, it's all part of the sweet mystery of life, LOL. Several times I've basically given up on a piece and told the customer it's the best I can do. I don't suggest you do that, but in my case I wasn't willing to put in unlimited time to figure it out when it might not have been solvable. I do also think there is a big difference in the polishability of different alloys.

And you're right, 2 years ain't enough. I'm figuring on at least 10 years before I'll call myself a polisher.

[clayboyrat]

Well I could send it to you but its all in pieces. I fined them hard to ride it that shape. I started re sanding this morning and felt some dimples. So I got a block and warped it with 320 and went over it. Seems to be all up and down. Almost as if it has soft and hard spots in the metal. I even have a couple of spots that almost look as if it had clear coat on it. Not that there was any on it to begin with. So right now am just trying to level her out. But thank for you input.

[jrow]

clayboyrat,

Could the blotchiness be caused by some type of lubricant staining the aluminum? If so you may have to heat it in an oven to get the stain out! You may want to try acetone or brake cleaner on the stain and see if that will take it out.

John

[clayboyrat]

It could be. There all in the area of a grease fitting. What should I heat it up to?