Re: 1928 driveshaft diameter

Posted by 32model901 On 2019/6/30 6:20:59
The trunions are heat treated but not fully hardened. Fully hard is 50-62 HRC, the trunions are probably around 38 to 45 HRC. Heat treating makes them tough but not brittle, fully hard they would be brittle.

They can be bored out using carbide tooling, CBN, or you could have them wire cut, EDM machined to accept bushings. Just be careful not to remove to much material to weaken them.

Another option would be to have the pin portion metal (thermal) sprayed and ground. The trunion bores would be machined first to clean them up and establish the size the pins would later be ground to.

Jig grinding the trunion bores would be one option if you went the metal spray route.

Info about the metal (thermal) spray process:https://www.ust.com.au/thermal-spray.htmlhttps://www.thermalspray.com/applications/repair-and-dimensional-restoration/http://www.empire-cat.com/Service/Precision_Machining/Thermal_Spray.aspxhttps://vacaero.com/information-resources/vac-aero-training/649-using-thermal-spray-for-repair-of-service-damaged-parts.html

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