alistairolsen
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| posted on 16/7/09 at 09:42 AM |
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Imperial or Metric?
I hear the conversions in the book are a bit ropey and it started on imperial measurements (in 1996 lol)
What did everyone use in their build, the imperial or metric dimensions?
did you build using inch tube or 25mm?
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Mr Whippy
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| posted on 16/7/09 at 09:45 AM |
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just use 25.4mm tube 
Fame is when your old car is plastered all over the internet
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ironside
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| posted on 16/7/09 at 09:47 AM |
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. . . and use the McSorley plans:
http://mcsorley.net/locost/drawings/bookChassis.pdf
[Edited on 16/7/09 by ironside]
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mcerd1
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| posted on 16/7/09 at 10:23 AM |
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most square tube comes in metric sizes - e.g. 25mm
and most round tube comes in imperial sizes (converted to metric) e.g. 25.4mm
-
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chrisg
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| posted on 16/7/09 at 11:09 AM |
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Or use, oh I don't know, maybe a newer book with all the dimensions in mm? 
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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alistairolsen
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| posted on 16/7/09 at 11:15 AM |
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I would have done, but I bought a book chassis, then bought a load of parts, then decided to build a fresh chassis and I dont really want to go back
to the beginning and do a roadster. I have both books tho.
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chrisg
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| posted on 16/7/09 at 11:39 AM |
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Gawd bless yer, Guvnor!
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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James
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| posted on 16/7/09 at 01:04 PM |
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quote:
Originally posted by alistairolsen
I hear the conversions in the book are a bit ropey and it started on imperial measurements (in 1996 lol)
What did everyone use in their build, the imperial or metric dimensions?
did you build using inch tube or 25mm?
To be fair to Chairman Ron, The Book was originally written in metric.
It was the people who added the imperial who cocked up the conversions.
I mentally used something of a mix in the end as a 40" width seemed far simpler than 1016mm!
Regardless of that, you're mad not to download the McSorley plans and use them!
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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Peteff
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| posted on 16/7/09 at 02:47 PM |
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My tape has metric one side and imperial the other, toss a coin FFS
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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alistairolsen
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| posted on 16/7/09 at 02:59 PM |
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thats fine, I dont care which I use as a measurement system when theyre equivalent. Point is, with steel and plans that are badly sorted they arent
and using a set of metric plans and inch tube when its actually 25 cos thats all you could get results in errors, hence my asking which people used in
this application
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Staple balls
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| posted on 16/7/09 at 03:20 PM |
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I'd use mm, they're smaller than inches
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ironside
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| posted on 16/7/09 at 04:59 PM |
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quote:
Originally posted by alistairolsen
thats fine, I dont care which I use as a measurement system when theyre equivalent. Point is, with steel and plans that are badly sorted they arent
and using a set of metric plans and inch tube when its actually 25 cos thats all you could get results in errors, hence my asking which people used in
this application
Don't worry too much about it. The book plans are awful, use the McSorley ones - it's for the same car just complete (detail for every
tube, including compound angles) and correct, there are no mistakes. There is a note on his site about 25mm vs. 1" box section:
quote:
http://mcsorley.net/locost/
Notes regarding Unit of Measure:
The CAD models were developed using standard measures based on 1" and 3/4" rectangular tubing. The drawings show secondary dimensions in
metric and the build accuracy when using the metric measurements should not be an issue. Each measurement that depends on the tubing thickness may be
off by at least .4mm (25mm vs. 25.4mm) and this small difference may be compounded during the assembly process. However, the overall effect of the
discrepancy is probably negligible given the accuracy of most shop tools (or lack thereof).
I have done exactly this, using the McSorley book chassis plans and metric (25x25x1.5mm) tube. It turned out just fine. Hope that sets your mind at
ease.
Simon
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alistairolsen
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| posted on 16/7/09 at 09:08 PM |
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Thats good to know. Yeah, Id read that note when I dwnloaded the plans, just wondered if anyone had made a conscious decision and run into any
problems.
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Peteff
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| posted on 16/7/09 at 10:27 PM |
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If you cut all your pieces of metal and weld them together and are less than 3mm out over the length of your chassis you are doing very well,
don't sweat the little things or you will never get the job done.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Ninehigh
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| posted on 17/7/09 at 07:02 PM |
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quote:
Originally posted by Staple balls
I'd use mm, they're smaller than inches
Yeah you get more to the pound
Is there a site for these Mcsorely plans or shall I just google them?
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Peteff
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| posted on 17/7/09 at 07:10 PM |
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McSorley.net
Here's the site but it's in the forum links as well under the title top left of your browser.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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aitch
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| posted on 6/12/09 at 09:09 PM |
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gotto be the same whether its imerial or metric
me id go for metric purely for sourcing fixings
aitch
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907
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| posted on 6/12/09 at 10:51 PM |
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If you build in imperial it will shrink 3mm when you weld it.
If you build in metric it will only shrink an eighth.
Paul G
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boggle
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| posted on 6/12/09 at 10:57 PM |
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just divide or times by 25.4.....
then they are all the same.....
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gazza285
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| posted on 7/12/09 at 04:35 AM |
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I don't use foriegn.
DO NOT PUT ON KNOB OR BOLLOCKS!
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alistairolsen
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| posted on 7/12/09 at 08:06 AM |
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The discussion wasnt about imperial or metric as such, I know they are equivalent. The discussion stemmed from the reported inaccuracy in uncle rons
conversion from one to the other, and the reputed fact that the plans were originally imperial
My Build Thread
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procomp
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| posted on 7/12/09 at 08:25 AM |
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Hi
The Westfield chassis he copied was in imperial. He just didn't know how many MM's there where in an Inch.
Chers Matt
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David Jenkins
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| posted on 7/12/09 at 08:46 AM |
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Some of his measurements work in imperial, others work in metric...
I found that making the pieces oversize and adjusting them to fit was the best policy. I didn't have the McSorley plans when I made my
chassis... 
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alistairolsen
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| posted on 7/12/09 at 09:02 AM |
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I used the Mcsorely plans and cut oversize by hacksaw and filed back to ensure a close fit to reduce weld shrinkage.
My Build Thread
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britishtrident
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| posted on 9/12/09 at 08:52 AM |
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The book might be metric but Ron original drawings were in imperial.
So it started out as imperial was converted to metric then a back to imperial conversion --- argh no wonder it had so many rounding errors.
quote:
Originally posted by James
To be fair to Chairman Ron, The Book was originally written in metric.
It was the people who added the imperial who cocked up the conversions.
I mentally used something of a mix in the end as a 40" width seemed far simpler than 1016mm!
Regardless of that, you're mad not to download the McSorley plans and use them!
Cheers,
James
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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