Scale measurements

[JR]

Hello all.
I have a scale 1.35 rule from RB, used many times. Today while measuring the opening for some gates I had a look at

Scale Conversion Calculator

online scale length converter that calculates the actual length and the scale length according to the scale ratio. scale ratio could be set by yourself, supports different length units, including imperial units and metric units.

www.ginifab.com

Now when I measure with the rule against my normal ruler.


The lower one and the scale version


When I measure the scale length and put it into the conversion chart I get.

Scale Ratio	:
Real Length	mm cm meters km inches feet yards miles nautical miles
Scale Length	mm cm meters km inches feet yards miles nautical miles

89 × 1 ÷ 35 = 2.5428571429 mm

While using the rule it comes out at over 3 .010 mm .
Any reason why and where am I miss using .
Here is the photo just taken of the scale rule with the normal size showing the 89mm and the scale measurement.


Confused to say the least with the scale converter.

 

[Jim R]

Hi John
Can't help, sorry, but that Scale Conversion Calculator is really useful.
Jim

 

[Tim Marlow]

To me, the ruler is incorrect. 89 mm divided by 35 is 2.54, as given by the calculator.
if the answer was 3, as given by the ruler, then 3 x 35 should give you 89, which it obviously doesn’t. The scale ruler is actually giving you the scale distance for just over 105 mm. Are you sure it’s not actually a 1/30 scale rule?

 

[scottie3158]

John,
Download a free app called Hobby color converter. As well as having a really good colour converter it has an excellent scale converter as well.

 

[boatman]

WELL TO ME John i was lost just reading it lol
chris

 

[The Smythe Meister]

Hmmmm,Not sure what`s going on there John,
HOWEVER,Judging by the date on your Scale ruler,(Pre 2016)...... i`d say "BLAME BREXIT" ..........
For everything else that goes wrong it seems to be the culprit these days!!
Andy

 

[Steve Jones]

Ask me a question on golf

 

[JR]

Hi John
Can't help, sorry, but that Scale Conversion Calculator is really useful.
Jim

That's what I've thought Jim, so judging by what Tim says and my own measurements the rule from RB is incorrect.

To me, the ruler is incorrect. 89 mm divided by 35 is 2.54, as given by the calculator.
if the answer was 3, as given by the ruler, then 3 x 35 should give you 89, which it obviously doesn’t. The scale ruler is actually giving you the scale distance for just over 105 mm. Are you sure it’s not actually a 1/30 scale rule?

My thought exactly Tim, its has printed on it 1/35 .

John,
Download a free app called Hobby color converter. As well as having a really good colour converter it has an excellent scale converter as well.

Good idea Paul i'll look at that in a few minutes, thank you.

WELL TO ME John i was lost just reading it lol
chris

 

[JR]

Hmmmm,Not sure what`s going on there John,
HOWEVER,Judging by the date on your Scale ruler,(Pre 2016)...... i`d say "BLAME BREXIT" ..........
For everything else that goes wrong it seems to be the culprit these days!!
Andy

Now that's a thought so using the compound interest rate divided by 25 x 12 x 135 it works quite well .I blame the French .

 

[JR]

Ask me a question on golf

And camo , small rivets and anything to do with PE.

 

[boatman]

Now that's a thought so using the compound interest rate divided by 25 x 12 x 135 it works quite well .I blame the French .

OH GOD he;s orf again lol
chris

 

[minitnkr]

Mark 1 eyeball works just fine. If it looks good it is good.

 

[JR]

Mark 1 eyeball works just fine. If it looks good it is good.

Agree with you on that Paul, I also used a figure when doing door ways.

 

[adt70hk]

John,

Sorry can't help but have enjoyed the humorous posts nonetheless!!
ATB.

Andrew

 

[monica]

I,m with Chris,[ boatman ] on this one as well never been good at working them out and have
over the years ask for some help ,just don,t get my head around it,

 

[Gern]

You should trust the calculations and not the ruler. The arithmetic will always give the correct answer, assuming you press the right buttons on your calculator - unless of course you're trying to work out 2 + 2 ÷ 2 = !

It more likely that the markings on your ruler have not been scribed accurately.

I don't know why you need a special calculator for scales. There's only a couple of things to remember:

ALWAYS use millimetres as your start measurement.

From real to scale size, divide by the scale.

From scale to real size, multiply by the scale.

The answers you get will be the measurement you want in millimetres.

If your answer looks silly, you've done your calculation the wrong way round.

 

[boatman]

You should trust the calculations and not the ruler. The arithmetic will always give the correct answer, assuming you press the right buttons on your calculator - unless of course you're trying to work out 2 + 2 ÷ 2 = !

It more likely that the markings on your ruler have not been scribed accurately.

I don't know why you need a special calculator for scales. There's only a couple of things to remember:

ALWAYS use millimetres as your start measurement.

From real to scale size, divide by the scale.

From scale to real size, multiply by the scale.

The answers you get will be the measurement you want in millimetres.

If your answer looks silly, you've done your calculation the wrong way round.

YEA back to front an upside down lol
chris

 

[JR]

John,

Sorry can't help but have enjoyed the humorous posts nonetheless!!
ATB.

Andrew

Glad you found it amusing Andrew

I,m with Chris,[ boatman ] on this one as well never been good at working them out and have
over the years ask for some help ,just don,t get my head around it,

Think the only time you need to work to a scale is when you've got a dio as well Mon.

You should trust the calculations and not the ruler. The arithmetic will always give the correct answer, assuming you press the right buttons on your calculator - unless of course you're trying to work out 2 + 2 ÷ 2 = !

It more likely that the markings on your ruler have not been scribed accurately.

I don't know why you need a special calculator for scales. There's only a couple of things to remember:

ALWAYS use millimetres as your start measurement.

From real to scale size, divide by the scale.

From scale to real size, multiply by the scale.

The answers you get will be the measurement you want in millimetres.

If your answer looks silly, you've done your calculation the wrong way round.

Dave I bought that scale rule when I first came back to modeling because of building dios, by the time you read this it will be in the bin !

YEA back to front an upside down lol
chris

Chris could you ask Jen to give you some more of the meds Matron left. I think its time.

 

[Gern]

Back when the world was very young, I started an engineering course. One of the modules was of course technical drawing and we students were supplied with all the drawing instruments we would need for the course (They weren't free mind, we had to pay a weekly amount). One of the items supplied was a triangular scale rule with 6 assorted scales. I can't remember what happened to mine but I know I never used it for any sort of measuring. Longer lines were done using the rules on the drawing board so I suspect the only thing I used it for was putting in cross hatching!

 

[boatman]

YEA back to front an upside down lol
chris
(boatman quote)

Chris could you ask Jen to give you some more of the meds Matron left. I think its time.
(John quote)


John im full of them now as matron dint leave enough as unknow to me till i caught her jens been getting high as well on them as she's been danceing in the livin room lol so have not got no more meds an if matron returns please tell her to leave her big neddles at home as Aaaaaaaaagggghhhhh they hurt lol

chris an jen