[SergentEng] Re: Cleasning Castings Before Assembly [1 Attachment]
I haven't broken that portion off, but I have a few where I've broken the shank at the hole where the bottom plate attaches. Each time it was during assembly as I pressed the parts together. All three were different styles, too.
The part you have to watch out for is on the very end of the red highlighted part and I don't find it on every knuckle, only one in three or four. Dry fit the knuckle and bottom plate without the ball to make everything works, then assemble the coupler with the ball. If it doesn't work it's pretty easy to find the cause and correct it before final assembly.
Very little cleanup is required. For me I make sure the cavity for the ball is clear as well as the cavities for the nubs on the knuckle. I also make sure the knuckle face is smooth. If those points are good, I dry fit the parts.
-------- Original message --------
From: "John Degnan Scaler164@... [SergentEng]" <SergentEng@...>
Date: 11/3/16 22:01 (GMT-06:00)
Subject: [SergentEng] Re: Cleasning Castings Before Assembly [1 Attachment]
Either I forgot to attach the photo, or Yahoo stripped it, So... trying again...
From: "John Degnan" <scaler164@...>
Sent: Thursday, November 3, 2016 10:42:33 PM
Subject: Cleasning Castings Before Assembly
During cleaning up the castings before assembly, has anyone ever actually broken off the little piece on the knuckle that the ball locks against when the couplers are locked closed? This piece is the area in red in the attached photo. I have recently acquired a few micro-sized wire brushes that I'm considering using to clean up the parts prior to assembly, and I'm wondering how careful I should be with these brushes in this extension of the knuckle... or if I should use the brushes at all?
(I ask this about both the HO and S scale couplers, assuming the S coupler to be more durable due to the larger size)