Myford Super 7 Gearbox Taper Pin

[Roderick JenkinsParticipant @roderickjenkins93242]

This thread has prompted a question: Is there any practical difference between a metric (1:50) pin (in red) and an imperial (1:48) pin (in blue) when bashed into a hole hand cut with the correct reamer?

Just a thought,

Rod

[Roderick JenkinsParticipant @roderickjenkins93242]

Oops, that's not what i meant to say. I'll try again.

Is there any practical difference between using a metric pin in a hole made with an imperial reamer (or vice versa) and using a taper pin in a hole made with the correct reamer?

Rod

[Bill Davies 2Participant @billdavies2]

Rod, the commercial grade on the site below shows a tolerance of +0.0013" to -0.0007" (per inch?), which is a little tighter than the two thou per inch of length difference implied by the Imperial vs Metric tapers.

Taper pin specs

The company (Stanho) is US, so the spec is not to BS36, and its name derived from "Standard Horse Nails."

But I can't judge whether it would make much difference. It's a wedging taper so friction plus some distortion would probably fold it. The site also mentioned a 'precision' grade, +0.0005" / -0.0000", so perhaps it does for some applications.

Bill

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