3. Frazer Nash Norris Special
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Author Topic: Frazer Nash Norris Special  (Read 2521 times)

RhysN

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Re: Frazer Nash Norris Special
« Reply #60 on: 26 Feb 22, 08:47 pm »
Looking good Mark, what's the gear ratio you are working on, that looks really tall!
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Mark Underdown

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Re: Frazer Nash Norris Special
« Reply #61 on: 26 Feb 22, 09:02 pm »
Rhys, if I’m right (I’m usually Wrong) I should be getting 1:9.23 not including the TAV unit.

I’m not sure what gear ratio other people are running?
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RhysN

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Re: Frazer Nash Norris Special
« Reply #62 on: 26 Feb 22, 09:08 pm »
Is there compound gearing in there I can't see Mark? I am shooting for between 6:1 and 7:1. (Based on experience)
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RhysN

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Re: Frazer Nash Norris Special
« Reply #63 on: 26 Feb 22, 09:11 pm »
Further to my last, I do see another set of sprockets in one photo. You will be able to climb walls!
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Mark Underdown

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Re: Frazer Nash Norris Special
« Reply #64 on: 26 Feb 22, 09:23 pm »
Yes there is an second shaft, you are correct.

I have a 10 tooth sprocket on the tav driving a 40 tooth,

This then drives a 13 tooth to a 30 tooth on the diff.   Giving 1 to 9.23

If I change the 13 tooth to 16 it should bring it to 1 to 7.5

I put the idler so I could achieve different gear ratios easily.

I guess the question is how hard is everyone revving the engines at the moment?

(I really hope my maths is correct now)  :)
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Mark Underdown

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Re: Frazer Nash Norris Special
« Reply #65 on: 13 Mar 22, 05:51 pm »
I finally have a rolling chassis!

I spent an afternoon welding the chassis up because most of it was tack welded up to this point.

At long last I am bolting things in place for the final time, so hopefully within a week or two it will be running and driving.

Weighed it today as well and all up it is 103kg which is probably heavy but less than I thought it would be.

Biggest worry now is how the steering will behave.
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jim

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Re: Frazer Nash Norris Special
« Reply #66 on: 13 Mar 22, 06:31 pm »
That's so cool. I would think it will handle like a vintage car and you will really get a feeling your driving the inspiration car.
 I am looking forward to seeing it at a meeting soon.
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Mark Underdown

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Re: Frazer Nash Norris Special
« Reply #67 on: 13 Mar 22, 06:53 pm »
Jim, thanks.   

As a man who needs a deadline to finish any project when is the first meeting likely to be where we can drive these cars. 
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StefanN

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Re: Frazer Nash Norris Special
« Reply #68 on: 13 Mar 22, 09:37 pm »
Well done Mark!  It looks great.  What’s your steering box?
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Mark Underdown

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Re: Frazer Nash Norris Special
« Reply #69 on: 13 Mar 22, 10:20 pm »
Stefan

The steering box is from some kind of industrial food processor, it has a 2:1 ratio, I don't think a 1:1 ratio would work very well the steering would be very heavy.  I'm trying to find a 1:3 ratio to make it a bit lighter.

Also being a T drive angle gearbox it can be flipped over to get the direction of rotation correct, saves a lot of head scratching!

I got lucky and found it on Ebay for £14.00 including postage, I have tracked down a company that sell them new from the markings on the case which I can forward to you when I find the email.

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Tinworm

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Re: Frazer Nash Norris Special
« Reply #70 on: 13 Mar 22, 10:35 pm »
Quote from: Marek.Z.N on 02 Nov 20, 10:24 am
Like this (just quickly cut it on
that is a good idea, Marek!
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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/

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David F-R

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Re: Frazer Nash Norris Special
« Reply #71 on: 14 Mar 22, 08:34 am »
Quote from: Mark Under on 13 Mar 22, 10:20 pm
Stefan

The steering box is from some kind of industrial food processor, it has a 2:1 ratio,

Please do tell us more.
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Mark Underdown

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Re: Frazer Nash Norris Special
« Reply #72 on: 14 Mar 22, 09:46 pm »
I looked at lots of industrial gearboxes including garage door gearboxes etc etc in the end I contacted Davall Gears who supply this type of gearbox and where extremely helpful.

http://www.davall.co.uk/media/59919/2000_series_2___3_shaft.pdf

Unfortunately they are expensive at over £220 plus vat and delivery which is why i went the ebay route for a used one.

The part number for the one I was discussing is: 182011131 this one has a 1:3 ratio instead of a 1:2 ratio which I found used.

If looking on Ebay searching Poggi Gearbox or Bonfiglioli bevel gearbox might help, be warned some have very small shafts 5-6mm which I dont think would be strong enough, they share castings so look pretty similar.  Mine has a 15mm diameter shafts which I think is about right for strength and weight.

I don't think the steering would work with a 1:1 ratio very well.
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Tinworm

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Re: Frazer Nash Norris Special
« Reply #73 on: 14 Mar 22, 11:11 pm »
Going from full right lock to full left, how many turns of the steering wheel is that?
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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: Frazer Nash Norris Special
« Reply #74 on: 15 Mar 22, 10:09 am »
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