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arpruss

Herringbone gear rack and pinion

by arpruss Apr 24, 2017
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i keep getting an error trying to export this out of the customizer... any idea why?

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This is not a double helical gear. It is a herringbone gear.
See this:
http://www.tandwiel.info/wp-content/uploads/dubbele-schroefvertanding.jpg
Also the slant of the teeth are commonly different between double helical and herringbone.

Thanks for pointing this out. Doing a Google Books and a Google Web search, it looks like there are three ways different sources use the terminology:

  1. In some references, the terms "double helical" and "herringbone" are treated as interchangeable. For instance Machine Elements: Life and Design (CRC Press).
  2. Sometimes, "double helical" is defined to have a space between the two helical slants and "herringbone" is defined not to have the space. That is the usage your reference has.
  3. Sometimes "double helical" is treated as the more general term, and "herringbone" is the special case when the spacing between the two slants is zero. Wikipedia does this. In this usage, all herringbone gears are double helical, but not all double helical gears are herringbone.

In any case, "herringbone" is indeed the more precise terminology, so I've renamed the file.

It will also assist others here in searching. As most of our extruders (wades for example) use a herringbone gear, that is the term that most people would search for to locate similar objects. I have found that thingiverse is less likely to produce a search result if the search term does not appear in the keywords, title and description. In the end I think the name change will facilitate thingiverse's quirky search for people who are looking for herringbone type gears for projects.

In any event, thanks for posting it. Its a handy thing to have.

And thanks for the comment. I really know very little about gears, but wanted to use this one for a rack and pinion telescope focuser that I'm designing.