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Old 10-17-2012, 12:02 PM   #1
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Default Miata differential bushing dimensions

I am at work so I apologize if this is easily searched topic but I am on my phone. Does anyone have the dimensions for a miata diff carrier bushing? I wrote it down when I had it out but have misplaced it and would like to make some up out of delrin today if possible. If someone could measure one with some calipers even just the thru bolt and outer diameter would be great.
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Old 10-19-2012, 02:19 AM   #2
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do you have solidworks? I have the part file
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Old 10-19-2012, 02:21 AM   #3
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yeah I have access to it email me if you can my<<<<<< username @ hotmail.com

Thanks!
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Old 10-19-2012, 11:09 AM   #4
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Can we get this file hosted? The more public we can make cad models of measured stock parts the better. This forum supports zip file attachments on posts.
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Old 10-19-2012, 11:34 AM   #5
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Old 10-20-2012, 03:12 AM   #6
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Bah, So both the CAD software I use on my mac that are supposed to allow opening of .sldprt files refuse to work, well one works and is crippled for dimensions unless I pay $450 dollars and the other doesn't. Can someone post a .DXF or a .DWG?
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Old 10-20-2012, 09:21 AM   #7
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Try this.
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File Type: zip Rear diff bushing.zip (9.5 KB, 143 views)
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Old 04-14-2016, 03:01 AM   #8
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thanks for the CAD!!
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Old 04-14-2016, 03:22 AM   #9
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onshape = free CAD platform that will open solidworks file
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Old 04-14-2016, 08:17 AM   #10
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straight outta solidworks
EDIT: to make things more clear: i just made a drawing out of a cad file which was posted earlier. made myself bushings according to these dimensions - everything fits OK
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Miata differential bushing dimensions-80-capture_c4b8ca4c56fe5de7850ae35da1a9f3dbf72219fc.jpg  

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Old 04-14-2016, 11:40 AM   #11
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No tolerances? Also there's only one 45 degree chamfer, not two.
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Old 04-14-2016, 11:46 AM   #12
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Quote:
Originally Posted by .one lane View Post
No tolerances? Also there's only one 45 degree chamfer, not two.
This isn't Mazda manufacturing print. This is someone who bought a bushing and took some calipers to it. Tolerancing should be pretty straight forward for this part.
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Old 04-14-2016, 12:11 PM   #13
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No it's not but if you take this to a machinist, they will ask the same thing.
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Old 04-14-2016, 12:14 PM   #14
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That's also going to be affected by material. What are you looking to make them out of?
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Old 04-14-2016, 12:30 PM   #15
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Materials, not so much. (Some materials do require a temperature controlled environment, etc etc) If the material can be machined it can have whatever tolerance you want. Different manufacturing processes, that will affect tolerance.

Tolerances will increase or decrease your cost. Let's say you're calling a super tight tolerance +/-.002" but in reality that feature only needs +/-.030" without affecting fit/function. Whatever material that didn't meet tolerance, majority of machinist will charge you for it.

A print is a instruction manual for machinist, they necessarily don't know where that part is going, how it interacts with other components, unless you give them your diff
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Old 04-14-2016, 12:42 PM   #16
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In this case it matters. The bushing is pressed into the carrier. Assume that 83.40mm diameter is the dimension of the differential carrier hole that the bushing is pressed into. A rubber bushing may be able to tolerate +0.005" -0, whereas a delrin bushing may only be able to tolerate +0.0005" -0, etc.

Tolerances have to make sense both for the manufacturer and the part application.
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Old 04-14-2016, 01:14 PM   #17
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Quote:
Originally Posted by .one lane View Post
No tolerances? Also there's only one 45 degree chamfer, not two.
It's a 2mm wide chamfer with a 45 degree angle, not two chamfers. I don't have any tolerances though.
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Old 04-14-2016, 02:41 PM   #18
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That's what I get for for looking through my phone lol. I usually call out chamfers like this

Feature <----- CHF: 2.0[0.80] X 45
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Old 04-14-2016, 02:51 PM   #19
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These should be double checked BTW. They seemed a little off when I measured my diff case.
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Old 04-18-2016, 01:57 AM   #20
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Quote:
Originally Posted by .one lane View Post
No tolerances? Also there's only one 45 degree chamfer, not two.
there's only one face which is needed to be controled - ∅66,10. it has 0.1mm for a press fit. other are basically free dimensions. And Oscar is right - there is 2mm wide chamfer, not two chamfers.
i have not measured it - just made a drawing out of a cad model which was uploaded in here earlier.
i' ve done two bushings for myself out of hdpe according to this drawing - works well, fitting was kinda tight into the diff bushing holes.
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