6 replies to this topic

[Alchemist]

For those that use "toothpaste" to lap gears for smoother mesh, I wanted to share this chart that lists Toothpaste Brands by RDA (Relative Dentin Abrasion).

 

Hope you find it useful!

 

Thank you.

 

Ernie

 

[Isaac S.]

Very useful, thanks! 

[Jesse Gonzales]

Back in the day of cast metal gears I used to use toothpaste to lap gears but it did not work as well has automotive lapping compound, in a pinch though it produced some quiet meshes. Of course if you recall in those days you pretty much had to mate a motor to a gear set due to motors spinning faster in one direction than the other, a problem solved by rewinding and setting your own timing.

 

the good old days....

 

Jess Gonzales

[Bill from NH]

The only gears I recall lapping in were the Faas bronze spurs. Those, we ran on a low voltage for  20 or 30 min. lubricated with Lubriplate white grease. If needed today, I might use a combination of oil & scouring powder on metal gears or heat on plastic. I'll have to check Ernie's chart to see how my Crest is rated.

[NSwanberg]

As I understand it if you want abrasive toothpaste get it from Russia.

[Lowflyer]

I use Tamiya ceramic grease.

[Racer36]

As I understand it if you want abrasive toothpaste get it from Russia.

When I was still on the tools we called that lapping compound!