Steering column

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ekim952522000
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Steering column

Postby ekim952522000 » 03 Mar 2009, 20:22

Have you decided to go with a Miata steering column or aftermarket? Looking at a Miata to get parts from and am going to grab the steering column if you are using it on your build.
Mike Uhlinger
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Midlana1
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Re: Steering column

Postby Midlana1 » 03 Mar 2009, 21:28

There are two sections to the Miata column and both appear to have collapsable sections. I like the bottom section, simple, light, but the upper assembly has an inner shaft within an outer assembly and is much heavier. So while I have both I haven't decided yet; it's just one of the million decisions to make. Sorry for not giving a straight answer; the consequence of being at the bleeding edge of a design. You're seeing all the dirty laundry, so to speak.

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Re: Steering column

Postby ekim952522000 » 03 Mar 2009, 22:07

No problem I am sure I will read when you decide I will wait until then.
Mike Uhlinger
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Northern California

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Re: Steering column

Postby bgkast » 07 Jan 2015, 22:05

Kurt-

It looks like you ended up making your own column. The book mentions that you used "thick wall" 3/4" tube. What wall thickness was used? What was used for an intermediate shaft between the miata rack (with the miata lower U-joint?) and your 3/4" tube?

Thanks

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Re: Steering column

Postby Midlana1 » 08 Jan 2015, 06:13

Yes I ended up using 3/4" tubing with 0.125-0.187" wall. I count on the "Z" shape of the layout to handle any collapsing necessary. It consists of two segments:

Lower segment:
I drilled the bottom end of the 3/4" tube and welded on the splined segment I cut off the Miata shaft. The top of this shaft couples to an aftermarket U-joint.

Upper segment:
The lower end of this section couples to the aftermarket U-joint, while the top end has the quick release spline welded to it.

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Re: Steering column

Postby bgkast » 11 Jan 2015, 18:46

The book states that the intermediate shaft from a Mazda 323 may fit the Miata lower u-joint...I can confirm that it does if you use it upside down. This one is from a 1987 wagon:

2015-01-11 18.34.35.jpg
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Re: Steering column

Postby Midlana1 » 11 Jan 2015, 21:10

Good to know, I'll remove the "may" from the next edition. Thanks!

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Re: Steering column

Postby bgkast » 19 Jan 2015, 12:05

I have not been able to find any 3/4" tube with walls thicker than 0.065 locally. I am considering using the 3/4" 0.065 tube that I have so I ran the numbers.

Maximum torque for 3/4" 0.065 tube: 2670 in*lb
Maximum torque for 3/4 double D shaft: 3437.5 in*lb
Maximum torque for .57 solid shaft that the book says is used in the stock Miata steering shaft : 1818 in*lb

So the .065 wall is stronger than the stock Miata shaft, but not as strong as the double D shaft used in many custom steering shafts.

I also calculated that the .065 wall tubing would twist 18 degrees assuming my 4' steering shaft and a 100 lb moment force on my 12" steering wheel...maybe a bit more than I would like.

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Re: Steering column

Postby Midlana1 » 19 Jan 2015, 12:44

Here's some from McMaster. $30 for 3 ft, 0.125" wall. http://www.mcmaster.com/#89955k839/=vjdp7s

It's just heavy wall tubing, so you can get it from many different places. To be honest I don't remember where I got mine from but it was probably McMaster.

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Re: Steering column

Postby bgkast » 19 Jan 2015, 13:22

Thanks, I may give that a try. It seems that isn't a common size for steel yards to carry...I called several and the all only had .065 wall.


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