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3-wheel knurling tool?

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Allen Smithee:
In my Stuart S50 thread I mentioned that it was part of a load of miscellaneous stuff I had been passed by an aging friend. There are some curious in the bunch which I probably need to ask questions about. The first one is this knurling tool:



As you can see, it has two wheels fitted (left and right knurls), but on the same side. Should there be a third wheel, or should that be a "blank" roller or something? In the same box there were a few spare knurling wheels, but none of the same size or pattern.

My brain wants to say "DUH???", but is there such a thing as a 2+1 knurling tool? If so how does it work without making an odd pattern?

Incidentally the same box had this which I'm pretty sure is an unfinished Hemmingway "Basic Knurling Tool" (HK1110) with the arms assembled on the wrong sides:



Perhaps that's what the other wheels are for.

AS

Admiral_dk:
As far as I can see - then there is a hole for an axle for the third wheel opposite the first two ....  :thinking:

Per

Allen Smithee:
Yes, I saw that. But I don't understand why this knurl has two wheels on one side. A third wheel would make a strange pattern, but if it was a plan wheel it would surely flatten the knurling? I usually take a skim cut over the surface after knurling to make it less snaggy - is this supposed to have a plain wheel to do the same sort of thing?

AS

internal_fire:

--- Quote from: Allen Smithee on July 08, 2022, 12:36:18 PM --- A third wheel would make a strange pattern
AS

--- End quote ---

I took a close look at the photo, and it appears that the knurls are straight, not angled. In that case a third (straight) wheel would work just fine.

Gene

Allen Smithee:
I'll check again later, but I'm pretty sure that the knurls are angled because I remember noting they were an opposing pair.

AS

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