Author Topic: Alternate axle  (Read 628 times)

Tinworm

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Re: Alternate axle
« Reply #15 on: 16 Mar 22, 06:35 pm »
I added rebound (beneath the slider) of a lighter rate using the same differential rate that is on my full size Morgan. The rebounds are only to stop the sudden drop to zero when the wheel unloads in either roll or bump.

I understand this. Great, thanks,

are you confident that a rigidly mounted axle with sliding pillar suspension at the kingpin/stub axle is all the suspension the car needs?

I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter

RhysN

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Re: Alternate axle
« Reply #16 on: 16 Mar 22, 08:46 pm »
As the originator of this is the 2 time holder of Carlos "World Series" I would not have gone ahead had he not been happy. So far all the UK events are amazingly smoother than the US ones, so I reckon it's worth a go.
I have an attitude that says "if it's broken it can always be fixed, If it never broke, maybe it was overstrength in the first place." Likewise I don't believe any automotive project is ever finished, why not experiment? It's the only real way to learn. Confucious say, "Man who never made mistake ever learned anything!"
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

Tinworm

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Re: Alternate axle
« Reply #17 on: 16 Mar 22, 08:54 pm »
As the originator of this is the 2 time holder of Carlos "World Series" I would not have gone ahead had he not been happy. So far all the UK events are amazingly smoother than the US ones, so I reckon it's worth a go.
I have an attitude that says "if it's broken it can always be fixed, If it never broke, maybe it was overstrength in the first place." Likewise I don't believe any automotive project is ever finished, why not experiment? It's the only real way to learn. Confucious say, "Man who never made mistake ever learned anything!"

never learned, I am guessing, but you are quite right, we should experiment. I  have written to Dave Dupaquier for advice
I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter

Tinworm

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Re: Alternate axle
« Reply #18 on: 16 Mar 22, 09:06 pm »
https://gittrevillegp.com/2021/09/18/maserati-250f/

for great close-ups on Dave Dupaquier's suspension
I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter

David F-R

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Re: Alternate axle
« Reply #19 on: 16 Mar 22, 09:14 pm »
Confucious say, "Man who never made mistake ever learned anything!"
And my woodwork teacher said, "Man who never made mistake never made anything".
'Mistakes' are an inherent part of making.
« Last Edit: 16 Mar 22, 09:17 pm by David F-R »
I'm not quite as green as I'm cabbage sounding.

Tinworm

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Re: Alternate axle
« Reply #20 on: 16 Mar 22, 10:00 pm »
I see that Dave D didn't have a return spring to dampen the unloading of the top one, but I think Rhys is right to have one. I need to find out how to calculate the strength of the springs needed and where to get them
I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter

RhysN

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Re: Alternate axle
« Reply #21 on: 18 Mar 22, 10:18 am »
Right now I am on holiday in Ireland away from my purchase list, I get back Sunday evening so will post the sources I used for springs. These people have thousands!
I don't know how Denny calculated the springs for Dave, I just received the shared information. Dave told me they worked perfectly, so I didn't try to re-invent the wheel.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

Tinworm

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Re: Alternate axle
« Reply #22 on: 18 Mar 22, 04:03 pm »
Thanks Rhys
I just chatted about this with Dave himself. He admires the improvement you made with the down spring, as I do, so I shall be using those, I reckon.

shall look forward to knowing where you got yours. Cheers
I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter

RhysN

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Re: Alternate axle
« Reply #23 on: 19 Mar 22, 04:03 pm »
Source for springs is Springmasters.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

Tinworm

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Re: Alternate axle
« Reply #24 on: 19 Mar 22, 08:49 pm »
Source for springs is Springmasters.

Thanks very much
I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter

Tinworm

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Re: Alternate axle
« Reply #25 on: 19 Mar 22, 08:59 pm »
Their range looks very good and prices reasonable, but they don't make entirely clear how they define load; their table doesn't even say what units it measures load in, though the deflection is clear (approx 38mm would give me the expected 1.5" compression expected for a 36kg load per wheel. But what weight is it rated to take? It isn't clear. Is it?

Also, how big is the rod - or diameter of bolt in lieu of kingpin?
I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter

RhysN

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Re: Alternate axle
« Reply #26 on: 20 Mar 22, 06:08 am »
As you say, the range is large. The detail on spring rate is there, you need to click on an individual item to discover full details.
My vertical pins are bright chrome hydraulic roam rod, drilled and tapped in the ends. The rod is 16mm as I made them. Dave used ordinary bolts.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

Tinworm

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Re: Alternate axle
« Reply #27 on: 20 Mar 22, 11:05 am »
As you say, the range is large. The detail on spring rate is there, you need to click on an individual item to discover full details.
My vertical pins are bright chrome hydraulic roam rod, drilled and tapped in the ends. The rod is 16mm as I made them. Dave used ordinary bolts.

Cheers
I don't have machine tools so will probably go for ordinary bolts too. Thanks for the 16mm though. Hopefully there are bolts long enough in that dimension.

I did click on individual springs and did see teh charts of measurements, but it talks only in terms of how far they will compresss and expresses loads in 4 figure numbers, but these don't equate to any weights I recognise, so it must be expressing something else. The annoying thing is that it doesn't define the units.
I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter

RhysN

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Re: Alternate axle
« Reply #28 on: 20 Mar 22, 04:18 pm »
I don't have machine tools either. For some things I'm happy with "near enough" and the bolts in the end of the bar is a case in point. I just drilled as close to centre as I could, then used a couple of drill sizes to get to 6.5, then tapped with a hand tap.
The spring rate shows in Newtons/mm. If you need a conversion just ask.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

Tinworm

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Re: Alternate axle
« Reply #29 on: 20 Mar 22, 04:57 pm »
If you need a conversion just ask.

thanks very much. I guess I will weigh the CK+me before working that out; wouldn't you?
I don't want to bore you all with the details, here. But if you are interested, have a look at my blog https://peteskart.blogspot.com/

-Peter