delrin vs aluminum

Nitric acid. Dissolves the tap but not aluminum. Order on ebay.
Robert
 
Because over time it will react with any steel part it is touching and "rust" to it

Especially if it gets wet. I just tried to get an aluminum and stainless roof rack apart after years of use. I had to cut it apart. Perhaps consider anti seize compound?
Robert
 
Especially if it gets wet. I just tried to get an aluminum and stainless roof rack apart after years of use. I had to cut it apart. Perhaps consider anti seize compound?
Robert

Apparently, machinist people that make their own sub plates use plain old KY jelly, and they have to take it apart and clean/reapply every few years but it keeps the two metals from reacting.
 
[QUOTE="rwm,
"Regardless, environmental conditions remain large determinants of corrosion rates."
[/QUOTE]

Not that it doesn't happen if it is dry, it just happens slower
 
Delrin seems soft for a motor mount but it depends on your specific set-up. I've painted aluminum with pretty good luck with no corrosion with steel in a wet climate even. For next time tapping in aluminum, maybe try roll-form taps. I've had really good luck with them for smaller holes. They mash the aluminum into threads instead of cutting the metal. I'm sure someone on this site told me about them a while back. I use some aluminum tapping oil (green can) I got at a building supply store years ago that works well. Once I started with roll-forming taps on Al, I've only broken one 4-40 tap in hundreds of 4-40 - 1/4-20 tapped holes. I broke "many" of the regular cutting taps in Al. Be advised though that drill hole sizes need to be a bit different for those taps.
 
Back
Top