pitobread

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.

motormechanic

iTrader: (1)

do you have solidworks? I have the part file

pitobread

yeah I have access to it email me if you can my<<<<<< username @ hotmail.com

Thanks!

Leafy

iTrader: (1)

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.

motormechanic

iTrader: (1)

Rear diff bushing.rar
done.

pitobread

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?

Oscar

iTrader: (2)

Try this.

w002

thanks for the CAD!!

.one lane

onshape = free CAD platform that will open solidworks file

w002

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

.one lane

No tolerances? Also there's only one 45 degree chamfer, not two.

acedeuce802

iTrader: (1)

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.

.one lane

No it's not but if you take this to a machinist, they will ask the same thing.

acedeuce802

iTrader: (1)

That's also going to be affected by material. What are you looking to make them out of?

.one lane

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

acedeuce802

iTrader: (1)

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.

Oscar

iTrader: (2)

It's a 2mm wide chamfer with a 45 degree angle, not two chamfers. I don't have any tolerances though.

.one lane

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°

aidandj

iTrader: (5)

These should be double checked BTW. They seemed a little off when I measured my diff case.

w002

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.