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The Miata Bushing MEGAthread: Heirarchy, DIY delrin dimensions, info and discussion

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The Miata Bushing MEGAthread: Heirarchy, DIY delrin dimensions, info and discussion

Old 11-22-2018, 06:11 PM
  #321  
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For this purpose it doesn't really matter.
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Old 12-20-2018, 06:04 AM
  #322  
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Default PSA - Sealing those holes

Maybe this is common knowledge, but I just discovered it ...

We all know there are a bunch of extra holes in the housings that have to be sealed, or the grease escapes. I drilled and tapped them for 8mm grub screws - job done, felt quite pleased with myself.

Belatedly, I realised that if only they made grease nipples (zerks) in 8mm, I might be able to kill two birds here, at least in some locations. And of course they do make them in 8mm ... so now I have a collection of straight and 90* 8mm nips to both fill the surplus hole, AND grease the bushes.

They will have to wait for the new year now, but I will report on what locations these can be used. In the meantime, if anybody is working on their SADFab bushes over the break, this is another option for sealing the holes.
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Old 12-20-2018, 10:54 AM
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Lol what extra holes?
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Old 12-20-2018, 07:22 PM
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The NBs had holes in the bushing bore, Tarek.
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Old 12-20-2018, 07:55 PM
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Everyday is a learning day. Thanks!
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Old 12-30-2018, 07:13 PM
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Apologies if this comment doesn't belong here and this may have been covered already, but is the wait list still supposed to be caught up by February? I joined the waiting list on November 5th. Waiting patiently is difficult, LOL!
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Old 01-07-2019, 02:43 PM
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So here's a dumb question that I can't find an answer to by searching - the FUCA bushings need to be drilled to 7/8" exactly centered. Recommendation is a lathe. Makes sense.

Pardon my dumb, but why doesn't a drill press work? I'm imagining using a centering cone to set the bushing up in a vise, and then swapping to the 7/8" bit and drilling it out.

With a lathe, does the lathe and bit have to be super precise, or does a generic woodworking lathe and a home depot bit work?
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Old 01-07-2019, 07:21 PM
  #328  
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Originally Posted by Mirage775 View Post
Apologies if this comment doesn't belong here and this may have been covered already, but is the wait list still supposed to be caught up by February? I joined the waiting list on November 5th. Waiting patiently is difficult, LOL!
Probably not, too much going on

Originally Posted by jspadaro View Post
So here's a dumb question that I can't find an answer to by searching - the FUCA bushings need to be drilled to 7/8" exactly centered. Recommendation is a lathe. Makes sense.

Pardon my dumb, but why doesn't a drill press work? I'm imagining using a centering cone to set the bushing up in a vise, and then swapping to the 7/8" bit and drilling it out.

With a lathe, does the lathe and bit have to be super precise, or does a generic woodworking lathe and a home depot bit work?
You can use any drilling implement you like provided you can reasonably hold the bushing without distorting it. The only way I've been able to do this repeatably is by machining a steel sleeve simulating the control arm bore. A 3 jaw chuck, or pair of v-blocks, let alone a plain vise will not hold it well without crushing it significantly. Removing the mold release does help though.
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Old 01-07-2019, 07:25 PM
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Originally Posted by hi_im_sean View Post
You can use any drilling implement you like provided you can reasonably hold the bushing without distorting it. The only way I've been able to do this repeatably is by machining a steel sleeve simulating the control arm bore. A 3 jaw chuck, or pair of v-blocks, let alone a plain vise will not hold it well without crushing it significantly. Removing the mold release does help though.
Ah, OK, thanks, that makes sense. What about just putting the control arm into a vise without removing the bushing? (Letting the other part of the arm/ the other bushing sit under the table)
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Old 01-07-2019, 07:55 PM
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I don't see why you couldn't do that, just make sure everything is square. I also forgot to mention regarding the bits, whatever you use make sure its sharp and use lots of lube. The bit itself doesn't have to be "precise", any 7/8" (twist drill) bit will work.
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Old 01-07-2019, 10:03 PM
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Makes sense, thanks!
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