Alan B
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| posted on 9/2/07 at 09:50 PM |
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More work on the rear suspension
Some progress on my rear suspension...that isn't the actual shocker I'm using, but it gives you some idea...
 
Feb 9 rear
[img][/img]
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Mansfield
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| posted on 9/2/07 at 10:13 PM |
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I love your work as it is amazing.
I would be a bit concerned by the rocker pivot though - could you go through the outer chassis member and use a better supported pivot shaft?
I don't wish to criticise, as I said I love your work.
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nitram38
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| posted on 9/2/07 at 10:58 PM |
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The pivot mount does not look any different to the areil atom set up and I do not know of any of these failing.
Nice work!
What have you used as a pivot bearing?
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Alan B
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| posted on 9/2/07 at 11:12 PM |
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Thanks guys..comments always welcome, good or bad.
There are diagonal tubes and side gussets to go in yet around the mount...I looked at many alternatives...but this seemed optimum.
The rocker pivot is 3/4" diameter shoulder screw with about 3/4" of it's length buried into the chassis bracket. the bearings are
flanged oilites (oil impregnated bronze for those who are not familiar.
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nitram38
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| posted on 9/2/07 at 11:15 PM |
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Any chance of a photo of the parts?
I have used nylon bushes on my present car, but my next car will have bearings.
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Alan B
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| posted on 9/2/07 at 11:23 PM |
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Sure, I'll get some pics for you.....
[Edited on 9/2/07 by Alan B]
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sgraber
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| posted on 10/2/07 at 06:45 PM |
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I love your design. Lovely piece of kit Alan. You've got mad skilz. 
One thing I can say is maybe rethink the rocker pivots? This suggestion relates directly to my own chassis' oversteer condition. I had Chris
Harrison (the expert) come over to the shop last night to look over my car and talk about the issues I experienced at the track. When I told him about
my oversteer issue and how the rear suspension is incredibly stiff, he immediately went to the rear rockers and pointed at my oilite brass bushings.
Quote: "I'm almost 100% certain that the bushing is binding at the bellcrank causing the suspension to not work properly."
Something to think about.
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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Alan B
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| posted on 11/2/07 at 09:02 PM |
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More pics as promised.....
 
Feb 11 01
 
Feb 11 02
[img][/img]
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nitram38
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| posted on 11/2/07 at 09:24 PM |
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Thank you for the pictures Alan.
Do you have one more showing the bearing side of the cam?
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Alan B
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| posted on 11/2/07 at 09:30 PM |
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The first of those pics shows the bearing fitted...one flanged oilite bushing each side...
 
Rocker section
[Edited on 11/2/07 by Alan B]
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Tralfaz
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| posted on 12/2/07 at 01:01 PM |
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Looks similar to what I planned on doing, though I intend on using Nadella Combined Needle Bearings (Available from Pegasus Racing). Certainly not
cheap, but I am concerned about exactly what Steve mentioned (Though to be fair I have heard of many racers using oilite type bearings with
success).
I was figuring on having my rockers Water-Jet cut, but am curious Alan, what sort of tolerances can you achieve with your Plasma CNC?
Brian
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nitram38
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| posted on 12/2/07 at 01:36 PM |
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Thanks again for the picture Alan.
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Alan B
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| posted on 13/2/07 at 02:50 AM |
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quote:
Originally posted by Tralfaz
Looks similar to what I planned on doing, though I intend on using Nadella Combined Needle Bearings (Available from Pegasus Racing). Certainly not
cheap, but I am concerned about exactly what Steve mentioned (Though to be fair I have heard of many racers using oilite type bearings with
success).
I was figuring on having my rockers Water-Jet cut, but am curious Alan, what sort of tolerances can you achieve with your Plasma CNC?
Brian
Hi Brian,
I don't anticipate any problems with the bushings. Binding only becomes a problem with either lack of lube, or excessive offset loadings that
create moments which cause high frictional loadings (desk drawer effect). I've designed for and used enough oilites in my career that I
don't anticipate a problem...but, ahem, we'll see..
The plasma in general I'd trust to plus/minus 0.020" (0.5mm). Anything important like holes I'll just pilot undersize and then open
up with a drill as pairs.
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nitram38
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| posted on 14/2/07 at 12:52 AM |
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Alan, I went to my local bearing shop and looked for bearings that could cope with side loads. They recommended the same oilites as yours.
They only cost £0.65p over here so I have ordered some.
I will copy your layout (my cams will be different) but as there is a gap where both bearings meet, I am going to install a grease nipple to make
lubrication easier.
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Alan B
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| posted on 14/2/07 at 01:09 AM |
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quote:
Originally posted by nitram38
Alan, I went to my local bearing shop and looked for bearings that could cope with side loads. They recommended the same oilites as yours.
They only cost £0.65p over here so I have ordered some.
I will copy your layout (my cams will be different) but as there is a gap where both bearings meet, I am going to install a grease nipple to make
lubrication easier.
Good idea about the nipples...crossed my mind too...
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nitram38
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| posted on 14/2/07 at 07:43 PM |
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Your Cam pictures inspired me to do my own for PROJECT X 
They are front and rear cams. They are unequal because of my new air ride suspension 
The shocks only rise 1 1/2" but I need the car to rise 3".
I am planning on running the car about 2-3" of the road !
 
front cam assembly
[img][/img]
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geoffreyh
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| posted on 18/5/07 at 03:48 PM |
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I'm wondering how you progressed since your last information.
It would be great if you could give us an update.
How is the Meerkat btw?
Geoff
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Alan B
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| posted on 18/5/07 at 03:59 PM |
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Geoff,
Update after this weekend.
The Meerkat is live and well, just on hold until I've finished fitting this little project in...
Thanks for following my progress (or lack of... ...)
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