mistergrumpy
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| posted on 15/1/11 at 10:45 PM |
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Decimal To Fraction
Can anyone help. I'm knackered and need a quick calculation doing but can't seem to get my head around it and it's driving me mad.
I have an M12 bolt which when measured with a vernier caliper comes in at 11mm + (38 x 0.02mm) give or take 1 either way.
I need to convert it to it's imperial fractal equivalent please.
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matt_gsxr
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| posted on 15/1/11 at 11:02 PM |
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I don't quite understand the question, but here is an answer 
Here are some mm dimensions close to 12mm.
15/32 = 11.9mm
29/64 = 11.5mm
7/16 = 11.1mm
Matt
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britishtrident
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| posted on 15/1/11 at 11:03 PM |
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Between 7/16" and 1/2"
15/32 is very close but not a standard preferred inch dia.
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RazMan
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| posted on 15/1/11 at 11:26 PM |
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Why are you having to convert back to imperial? Are you trying to get the bolt to fit an old Roman chariot?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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matt_gsxr
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| posted on 15/1/11 at 11:33 PM |
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quote:
Originally posted by RazMan
Why are you having to convert back to imperial? Are you trying to get the bolt to fit an old Roman chariot?
Note a Roman foot is 29.6cm (not ~305mm). Maybe that explains the discrepancy.
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Madinventions
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| posted on 15/1/11 at 11:53 PM |
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I made this chart in Excel a long time ago and it's proved invaluable over the years!
 
Metric imperial conversion cha
Left column is fractions of an inch, top row is whole inches, middle is all metric.
So if you want to convert 5 7/16" to metric, look in the '5' column, and go down to the 7/16 row, answer 138.1mm.
If you want to convert 12mm to imperial, just find 12 on the grid and read the column and row headers. in this case, the nearest is 15/32" as
others have said.
HTH,
Ed.
Mojo build diary: http://www.madinventions.co.uk
Solo music project: Syrrenfor http://www.reverbnation.com/syrrenfor
View my band website:
http://www.shadowlight.org.uk
http://www.eastangliankitcars.co.uk/
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loggyboy
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| posted on 16/1/11 at 12:33 AM |
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Excel has a fraction fuction (right click on cell, format cell, number = fraction)
11+(38x0.02)=11.76
in inches = 0.462992 = 25/54 (rounded to double figures)
Obviously plaing arround with the 11.76 figure evetually leads to the more common fractions Matt posted
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lewis
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| posted on 16/1/11 at 09:08 AM |
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Or get a zues book.
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designer
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| posted on 16/1/11 at 09:08 AM |
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Download Convert; it's brilliant.
http://www.ppe.com/convert.htm
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mistergrumpy
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| posted on 16/1/11 at 11:24 AM |
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MadInventions. That's great! Going up in the garage that.
The reason I was asking about the conversion is that I was at the Autosport show yesterday and was speaking to McGill Motors about rose joints. I
thought that I might price up and have a go at some rose jointed top wishbones. The man on the stall said to go for the black high misalignment joints
on the site and they only seem to come in imperial sizes and I currently have M12 bolts on my suspension.
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RazMan
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| posted on 16/1/11 at 11:31 AM |
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Probably a good idea to ream them out to 1/2" then - a common fix for that type of size change
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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mistergrumpy
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| posted on 16/1/11 at 12:29 PM |
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No going back once I ream them out. So 4 x 1/2" rose joints = £32.40 plus whatever steel is.
I was just thinking of something to do on the car now its finished and I've finally got a pay rise at work meaning I have a little spare cash
again and I appear to hve been bitten by the bug again after Autosport 
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Ninehigh
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| posted on 16/1/11 at 07:44 PM |
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quote:
Originally posted by matt_gsxr
quote:
Originally posted by RazMan
Why are you having to convert back to imperial? Are you trying to get the bolt to fit an old Roman chariot?
Note a Roman foot is 29.6cm (not ~305mm). Maybe that explains the discrepancy.
Iirc a Roman Foot was however long the Emporor's foot at the time was. Hence the term "foot"
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loggyboy
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| posted on 16/1/11 at 08:21 PM |
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quote:
Originally posted by Ninehigh
Iirc a Roman Foot was however long the Emporor's foot at the time was. Hence the term "foot"
As with most things, it was the Egyptions that was then taken on by the greeks/romans.
http://en.wikipedia.org/wiki/History_of_measurement#History_of_units
(not that wiki is the be all and end all of anything!
[Edited on 16/1/11 by loggyboy]
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