Interfering with fits?

[Pete.Participant @pete-2]

Thanks you very much Richard.

[Howard LewisParticipant @howardlewis46836]

Looking back through some old M E s came across a formula to aid arriving at the correct interference.

A = (1.00625 D) + 0.5 where A is the interference in Thous, and D is in inches.

Presumably A would be microns, and D would be mm if working in Metric units.

Seems a bit large to me, being overcautious.

0.001" on 1.000" steel into cast iron seems to work OK for me, so maybe 1/1000 on diameter might be an adequate rule of thumb..

Anyone like to confirm?

Howard

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