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  #1  
Old 29th December 2013, 08:31 PM
TheArf TheArf is offline
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Default Steering rack brackets

Good evening Gents,

today I have made a bit of progress on the suspension and whilst working on the front end my mind wandered, as it does when you get to my age, doesn't it Ayjay.
It wandered to the world of the steering rack bracket, and how flimsy it looks so am thinking of coming up with a different idea.

Now to my question, is there an optimum hight from the bottom face of the chassis to the centre of the rack, I couldn't find anything in the book and I have left it over in the workshop so won't get to it until tomorrow.

kind regards

Arfon
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  #2  
Old 29th December 2013, 09:22 PM
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alga alga is offline
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95 mm, see drawing on page 75.
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Old 29th December 2013, 09:26 PM
TheArf TheArf is offline
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Thanks Alga
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Old 30th December 2013, 08:35 AM
jason 82 jason 82 is offline
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Any reason why box section can't be used ? As long as the outside diameter is the same, surely this will strengthen up the front rack bracket considerably ? I know that it will take longer to fabricate, but as long as the wall in the box is sufficient, it should work champion.
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Old 30th December 2013, 09:25 AM
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TSM Locost TSM Locost is offline
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Default Steering rack

Have you seen this, Steering Rack Support Revised Drawing in book amendments.
http://www.haynesroadster.pwp.blueyo...ng_support.pdf

Fold a 3mm steel sheet to the same angle as drawing and weld front and rear.
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Old 30th December 2013, 01:26 PM
TheArf TheArf is offline
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I was thinking of using Box section and having it in the same orientation as Janne's and either drill and tap some holes or mill some slots to bolt through

Arfon
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Old 30th December 2013, 07:12 PM
flyerncle flyerncle is offline
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Two 5mm plates with bolt holes under the rack mounting fixes the flimsy aspect of it.
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Old 30th December 2013, 10:45 PM
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Quote:
Originally Posted by jason 82 View Post
Any reason why box section can't be used ? As long as the outside diameter is the same, surely this will strengthen up the front rack bracket considerably ? I know that it will take longer to fabricate, but as long as the wall in the box is sufficient, it should work champion.
You'd have to incorporate crush tubes into the box section. Combine it with slots for adjustment, and it does not sound so easy at all. The alternative is to cut the tubes open and clamp to a single wall of the box section.

An alternative is to fill in the triangular sides, as Mopple has designed in his chassis Solidworks model: http://grabcad.com/library/haynes-roadster-chassis
The drawback of this approach is slightly impeded access to the clamp nuts.
Mopple's design is folded out of a single laser cut piece of 3 mm plate, if I recall correctly.
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  #9  
Old 31st December 2013, 07:20 AM
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voucht voucht is offline
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Hi,

I don't know if someone else here is using Madis (Mopple)'s modified steering rack support design, but I do, so I thought I could share some pictures.


S-rack frame par Voucht71, sur Flickr


2011-10-09_17-40-33 par Voucht71, sur Flickr

I ordered the assembly directly from him (at that time, I paid 13 euros + shipment!), it consists of 4 parts : 2 sides, 1 top (90 bent plate), 1 cross plate.


2011-09-29_15-14-50 par Voucht71, sur Flickr

I'm so glad I am using this revised design, it feels much safer than the book's design.

Here is the page of my blog about the fitting of this part on my chassis, with pictures.
http://vouchtroadster.blogspot.se/20...ring-rack.html

Hope this can help
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  #10  
Old 31st December 2013, 07:54 AM
TheArf TheArf is offline
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I am missing something here, why the crush tubes, the slotting is easy just not sure why the crush tubes.

Arfon
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