13-07-2024, 06:59 PM
(This post was last modified: 13-07-2024, 07:05 PM by Tony Griffiths.)
(13-07-2024, 01:58 PM)JonE Wrote: is there thus any special requirement for how one inserts a roll pin? - do they just go in a little bit and then compress in a vice with some blocks?"Spring pins have a body diameter larger than the diameter of the hole they are intended for and a chamfer on either one or both ends to facilitate starting the pin into the hole."
Once started, they can be driven in with a hammer - or similar - the spring action of the pin allows it to compress to assume a tight fit in the hole.
It helps to grind a shallow taper to help get them started.
If you find an original fitting, the parallel pin is domed at each end - presumably some sort of assembly jig being used to close the ends down simultaneously.
Note though what I discovered about the variation in quality control of these items: for a 1/8" hole a selection was measured, variously (across the diameter with the slot upright) as 0.1310", 0.1315", 0.1320" and 0.1335". All greater than 1/8" (0.125") and no doubt all useable.