Gun Oil Friction Testing – Coming Soon

I have always wanted to test gun oils scientifically but wasn’t sure how to do this UNTIL NOW.

the inclined plane and sled friction test.

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Inclined Plane/Sled Friction Test

I’m still perfecting the test equipment but I’m getting closer. I’m going to use an inclined plane friction test to determine which oil reduces friction the most. A metal sled is placed on an inclined metal plane to determine at what angle the sled breaks free from friction. Bare metal will be the control test and the oil results will be compared to other oils and bare metal. Oil should reduce the friction between the metal sled and the metal inline resulting in a lower angle compared to bare metal.

I’m still finishing the surfaces of the inclined plane and the sled to match the surfaces of typical gun parts. I still have several hours of filing and sanding before I can try testing again. My initial testing proved to be a little too inconsistent. The surfaces were to “grabby” because of the coarseness of the finish. The “swirl” type 220 grit sandpaper finish was way too coarse. I’m going with a mono-directional finish…the final finish will be 400 grit sandpaper.

This is the finished inclined plane. It’s 1/2″ thick by 4″ wide and 24″ long. I wanted the surface to be as close as possible to the finish on most guns. I used a file to true the surface and then wet sanded it with 220, 320 and 400 grit metal sandpaper.

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1/2″ thick by 4″ wide and 24″ long…final polish.

Here is the metal sled used to slide down the metal inclined plane.

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1″ thick by 2″ wide and 4″ long…polished to 400 grit.

I used M-Pro7 Gun Cleaner to clean all metal surfaces after each test.

M-Pro7 Gun Cleaner

Wixey Digital Angle Gauge to measure the plane angle or slope.

Wixey Digital Angle Gauge

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Anyway, I did run across a very interesting fact regarding gun oils…too much oil definitely increases friction and acts like a suction cup on an inclined plane. I first played with Rem Oil on the inclined plane, I liberally wet down the inclined plane with Rem oil and then placed the metal sled on it. I had to raise the inclined plane to almost 35 degrees in order to get the sled to slide. It stuck like glue. I then wiped off the excess oil and tried again. The sled moved at about 14 degrees of incline. I once again wiped off as much oil as possible with clean patches. I mean I was seriously wiping it down…trying to remove all of the oil. Again I put the sled on the incline and moved the incline up slowly. The sled moved at about 8 degrees.

Here is the friction test using a liberal amount (too much) of Remington Rem Oil. The sled would not move until about 33 degrees of incline. Compare this to bare metal which moved at an average of 15 degrees of inline.

Too Much Oil

Too much oil affects the amount of force required to move 2 surfaces against each other but it still reduces wear. So when it comes to reducing wear…more or less lubricant works equally. But when it comes to friction…less oil is much better.