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So, I was cutting the shock mount off one of my TAs and accidentally nicked the "webbing" between the two arms of the bearing support with the cutoff wheel.
The nick is only 1/2" long and does not go all the way through the webbing.
Here's a pic from the end showing the other side of the webbing was unaffected by the nick.
Should I be worried about this for future use?
Thanks,
Paul
Last edited by nwav8tor; Jun 24, 2020 at 01:49 AM.
Blend it out. Remove all the sharp edges and smooth it. We blend GE fan blades all the time- considerably more stress that the bearing support will ever see.
We use 4x the depth for the length on those. I'd just take the sharp edges away and smooth everything out.
Yes. As it is, you have created a 'stress riser' which can form a crack at the bottom of that "nick" (I would call that a "cut"); and it will progress thru the part, if not addressed.
Use a rotary tipped grinding bit (less than 1/4" round or tapered) to turn that 'cut' into a smooth 'valley'. Only go as deep as needed to just clean up the edges in that cut. Rounded, smooth flowing material is what you want. Although you are removing more material, you will be increasing part integrity (although not quite back to where it was). If the valley surface is still rather rough, sand it to 150 grit paper quality.
No on drilling the hole. I don't remember if those are cast iron or cast steel, if thats steel then a simple tig weld would fix it. If iron , then blend it.
Smoothing it all down will prevent any crack from initiating. If a crack has already initiated, then drilling a hole thru at the end of the crack will keep it from progressing further. You don't have any cracking, yet.
Sorry for the lousy picture (new camera apparently isn't as good as the old one) but thanks for the reply.
Due to my rusted TAs I may not reuse the bearing carriers since I'll probably be going with completely new TA assemblies. I may not even use them as core returns.
Nothing definite decided yet as there are SO many options...
Rear Bearing Support Webbing Nick
