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
Toothpaste abrasion chart
Started by
Alchemist
, Mar 30 2021 03:14 PM
6 replies to this topic
#2
Isaac S.
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Posted 30 March 2021 - 03:35 PM
Very useful, thanks!
Isaac Santonastaso
#3
Jesse Gonzales
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Posted 30 March 2021 - 07:07 PM
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
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#4
Bill from NH
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Posted 30 March 2021 - 08:44 PM
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.
Bill Fernald
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#5
NSwanberg
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Posted 31 March 2021 - 03:32 AM
As I understand it if you want abrasive toothpaste get it from Russia.
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#6
Lowflyer
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Posted 31 March 2021 - 04:53 AM
I use Tamiya ceramic grease.
Thorkild Hjorth
#7
Racer36
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Posted 31 March 2021 - 09:01 AM
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!
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Dennis Dominey
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