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General Category => General Forums => Topic started by: marc_reusser on January 18, 2011, 01:17:30 AM

Title: Brain fart..Scale conversion multiplier help needed
Post by: marc_reusser on January 18, 2011, 01:17:30 AM
For some reason my brain is just not functioning.....

Can somebody give me the scale conversion ratio/multiplier for full size/1:1 to 1:35  .......I seem to think and end up with .02857......but just not sure.


Marc (really losing my marbles)
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: mad gerald on January 18, 2011, 01:33:13 AM
... are you serious ...  ???

0,028571428 seems to be correct ... (as far as I can trust my pocket calculator and BRAIN 1.0)  ;)

HTH

Gerald
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: jacq01 on January 18, 2011, 01:41:42 AM

    0,02857142857142857142857142857143   is a good approximation  ;D ;D

     Jacq
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: marc_reusser on January 18, 2011, 02:28:35 AM
Thanks guys......was just having one of those moments, when for some reason it didn't make sense to me.....and I didn't trust myself.

Marc
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: danpickard on January 18, 2011, 03:51:41 AM
Marc, once you've worked it out, not sure if you may find this little applicaton as a handy tool to keep on the "desktop"...I've found it a quick and easy tool to refer too, rather than walking to the other end of the house to the hobby room to find a scale.  You are able to add which ever scale you want into it and the conversion will calculate.

http://www.hollywoodfoundry.com/sconv2.zip

Dan
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: Frederic Testard on January 18, 2011, 03:52:45 AM
Easy rule : when you have a size s on a 1:n scale model and you want to know how much it would be on a 1:m scale model, you multiply s by n and divide by m.
It works even if n = 1. So you must divise by 35 = multiply by 1/35 = what Jacq said with a veeeeery small error still less than your minimal resolution, Marc (but when you get even better, we might have to add a few digits :) ).
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: SandiaPaul on January 18, 2011, 04:36:02 AM
This site has a bunch of good calculators, its a button at the top right:

http://scalemotorcars.com/index.php

paul
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: Gordon Ferguson on January 18, 2011, 06:46:48 AM
Paul,

thanks for that link - the bolt hole calculator is really useful (calculates any number of bolts around any size of circle)
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: JohnP on January 19, 2011, 04:50:39 PM
I make Excel spreadsheets that have the conversions by the scale inch, and then have 1/4 - 1/2 - 3/4 on the top to add into the whole inch conversion. No calculator needed. I can fit 192" on one printed sheet easily, more if I made the font smaller.
John
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: Mr Potato Head on January 19, 2011, 06:29:32 PM
Marc! You call it idiot scale! 1:32, but I say it's a whole lot easer to look at the ruler! HA LOL
Gil
MPH for short!
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: Malachi Constant on January 19, 2011, 06:36:38 PM
The angle of the dangle is inversely proportionate to the heat of the beat ...

Check your spam box to find ads for multipliers.
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: jim s-w on January 21, 2011, 08:20:22 AM
Hi All

Sorry for being dim but why not just divide by 35?  If something is 1000mm long in the real world it will be 28.57mm long in 1:35 scale.

I suppose I am missing a point somewhere  ???

Jim
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: DaKra on January 21, 2011, 08:35:18 AM
I'm with Jim.  ??? A multiplyer looks like an answer you'd get if you asked an areospace engineer.   I just convert 1/1 measurement to inches and divide by whatever the scale factor is.   Or multiply the model dimension by the scale factor to get 1/1 scale.   

Here's a math question.  How do I figure the percent of enlargement or reduction to a drawing to go from one scale to another?  (I actually posed that question to an arerospace engineer friend, and the reply he sent me looked like Einstein's chalkboard after a pot of coffee-- there's got to be an easier way.)   

Math ain't my thing, fortunately its a skill that can be replaced by the $4.99 solar calculator I keep on my workbench!

Dave


Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: Frederic Testard on January 21, 2011, 09:15:56 AM
I gave the answer above, Dave. To convert a plan in 1:n scale to a plan in 1:m scale, you enlarge by n/m. (If n < m, this means you reduce...)

Example : you have a plan in 1:48 scale and you want the thing in 1:64 scale. You "enlarge" by 48/64 = 0.75. That means you set the copier at 75% (and so you reduce the plan).
In the other direction, from 1:64 to 1:48, you enlarge by 64/48 = 1.33. So you set the copier at 133%.

Hope this is less difficult than general relativity... :)
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: DaKra on January 21, 2011, 09:28:50 AM
Thank you Frederic!  Crystal clear now, and I will enjoy explaining to my engineer friend, the simple way to solve this problem.  ;D

Dave
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: Mr Potato Head on January 21, 2011, 12:26:44 PM
Fredrick! why wern't you my math teacher! that was so simple even I could understand it!
thanks
Gil
Short for MPH
Title: Re: Brain fart..Scale conversion multiplier help needed
Post by: Frederic Testard on January 21, 2011, 02:17:48 PM
I'm glad it helped, Dave and Gil.