T66
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| posted on 8/12/11 at 07:12 PM |
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Column Shortened - Advice Please
The column is shortened, the top bracket is tacked in place, Ive also tacked on a UJ to the cut down intermediate shaft. The top of the Sierra fluted
tube has been cut down to accept the MNR paddles.
I ordered a bottom bearing for the column a couple of days ago, so havent started making the bracket for it , till Ive seen it.
Need some experienced eyes over the job please.
Problems/Options
1) Top column is fairly solid vertically, but has lateral play - Its the tube moving in the alloy clamp/pinch bolt. Will the bottom bracket stop
this?
2) With the Sierra wheel on the column, nut tight, it doesnt pull up the sprung section of the column, Am I missing parts?
3) Once the column is pulled back 20mm with the wheel, the steering rotates lock to lock nice & smooth, are the bottom UJ angles going to cause me
problems, they appear to rotate smoothly.
4) Is welding up the bottom UJ going to bother those who will be inspecting the car ? - assuming my welds are ok of course.
None of it is set down yet, and only tacked in place, Everything can still be moved if need be, all metalwork will get finished off once Im happy.
Observations / suggestions - Just go easy Im a sensitive type- honest
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designer
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| posted on 8/12/11 at 07:23 PM |
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The top column needs another support near to the UJ.
Only use universal joints specially made for steering linkages as they are manufacture to have very little play.
To work properly joints must be ‘phased’, all joints aligned so they do not oppose each other.
The maximum angle, on any single joint, must be not more than 27 deg.
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MikeRJ
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| posted on 8/12/11 at 07:33 PM |
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Agreed, the UJs are 90 degrees out in that picture which will give rather non-linear steering i.e. rack movement will not be proportional the steering
wheel angle.
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T66
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| posted on 8/12/11 at 07:37 PM |
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quote:
Originally posted by designer
The top column needs another support near to the UJ.
Only use universal joints specially made for steering linkages as they are manufacture to have very little play.
To work properly joints must be ‘phased’, all joints aligned so they do not oppose each other.
The maximum angle, on any single joint, must be not more than 27 deg.
Quick look at my picture, the yokes are opposed 90deg - so not phased as you suggest , so will need sorting ?
I have decided to copy this solution to support the column above the top UJ, the same style of bearing is in the post to me.
http://nw.rhocar.org/supporting_the_steering_shaft.htm
Whats the advice with welding the bottom UJ to the shaft, or do I just crack on with it ?
Thanks for spreading the knowledge, will keep an eye on the UJ angles once everything goes in finally.
Ivan
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Stott
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| posted on 8/12/11 at 09:51 PM |
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To use that bearing you will need about an inch and a half of the inner triangle section of the sierras column protruding out of the end which I
can't see in your pic.
I've used that bearing and it works well, it's just if you have ordered that specific size then I don't think the outer of the
column will fit through it.
Atb
Stott
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T66
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| posted on 8/12/11 at 10:12 PM |
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I've still got triangular section protruding , there's still some space to be found.
Plan is to make the plastic bush fit the bearing nice & snug.
Then have the bracket holding the bearing fastened to the scuttle.
Why would I need more triangular bit protruding ? Surely the bracket/bearing above the top uj will hold it all up. Fingers crossed.
Cheers Stott.
Ivan
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Stott
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| posted on 9/12/11 at 09:11 AM |
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What I mean is that to use that bearing with the plastic bush from the sierra then you would need enough triangle bit poking out to slide that bush on
and ultimately mount the bearing on. It's just I couldn't see any of it in the pic, it looks like the outer buts up to the first uj.
If there's enough to put the bearing on then great it'll work fine
Atb
Stott
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T66
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| posted on 9/12/11 at 09:38 AM |
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quote:
Originally posted by Stott
What I mean is that to use that bearing with the plastic bush from the sierra then you would need enough triangle bit poking out to slide that bush on
and ultimately mount the bearing on. It's just I couldn't see any of it in the pic, it looks like the outer buts up to the first uj.
If there's enough to put the bearing on then great it'll work fine
Atb
Stott
Champion Stott
I know what you mean - Yes theres still a bit more triangular column to appear from inside yet. The outer column will pull up toward the wheel about
25mm yet.
Aslong as that bearing isnt really bulky, I reckon I can get a bracket on it in the space available. Still not sure where to bracket it too yet, the
scuttle is flexing as its just light panel.
Will probably put another length of square tube in to stop the flexing.
Thanks again.
Ivan
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snowy2
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| posted on 9/12/11 at 09:45 AM |
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I have driven and owned some cars that had some radical angle‘s through which the steering UJ‘s had to opperate. on cars as light as ours its not a
problem worth worrying about. technically it is less than ideal and on an F1 car it might be an issue, and for longevity of the joints it could be an
issue but we are talking a kit car which will be lucky to see a few thousand miles in its life much less in a year. a properly supported steering
column shouldn't give you any trouble and you are extremely unlikely to ever notice any adverse steering effects by having your uj‘s turn
through more than 27 degrees.
sometimes you are the pigeon, most of the time the statue.
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T66
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| posted on 9/12/11 at 10:01 AM |
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Thanks for the UJ feedback - Music to my ears
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