noname Posted May 10, 2012 Share Posted May 10, 2012 I've always had the understanding that 1mm in 1/25 scale equals 1 inch in real life. Lately I have been building some chairs for a 1/25 build and they look more like kids chairs next to my Woody. I took measurements from chairs in my house and converted them from inches to mm. Anybody know why they appear too small? Thanks Quote Link to comment Share on other sites More sharing options...
62rebel Posted May 10, 2012 Share Posted May 10, 2012 i'm no math genius but going by my socket set, a 12mm socket roughly equals a 1/2" socket.... and a half inch in 1/25 equals a foot, more or less. so, 1mm actually matches a half-inch more so than a full inch in 1/25th. my advice? cut your losses and frustration and buy one of the scale conversion rulers. an architect's or engineer's scale for drafting is what i've been using for decades. Quote Link to comment Share on other sites More sharing options...
Erik Smith Posted May 10, 2012 Share Posted May 10, 2012 (edited) i'm no math genius but going by my socket set, a 12mm socket roughly equals a 1/2" socket.... and a half inch in 1/25 equals a foot, more or less. so, 1mm actually matches a half-inch more so than a full inch in 1/25th. my advice? cut your losses and frustration and buy one of the scale conversion rulers. an architect's or engineer's scale for drafting is what i've been using for decades. Actually, your method calculates 1mm equals 1 inch. If 12mm equals 1/2 inch and 1/2 inch equals one foot, than 12mm equals 1 foot. Therefore, 1/12mm would equal 1 inch. Edited May 10, 2012 by Erik Smith Quote Link to comment Share on other sites More sharing options...
Harry P. Posted May 10, 2012 Share Posted May 10, 2012 There are 25.4 mm per inch, so 1 mm would equal 1/25 of an inch. Or 1 mm = 1 inch in 1/25 scale. So to put it simply, yes, 1 mm = a 1/25 scale inch. Why do your chairs look small? Maybe you measured wrong somewhere. But the 1mm = 1 inch in 1/25 scale is correct. Quote Link to comment Share on other sites More sharing options...
Dr. Cranky Posted May 10, 2012 Share Posted May 10, 2012 That are scale cards you can buy that helps keep your scratch-building straight. I think I got mine from EZ Scale Card or some such place. Quote Link to comment Share on other sites More sharing options...
jeffs396 Posted May 10, 2012 Share Posted May 10, 2012 (edited) I've always had the understanding that 1mm in 1/25 scale equals 1 inch in real life. Lately I have been building some chairs for a 1/25 build and they look more like kids chairs next to my Woody. I took measurements from chairs in my house and converted them from inches to mm. Anybody know why they appear too small? Thanks Probably because your Woody in 1:1 is large, and your house chairs are relatively small in comparison Edited May 10, 2012 by jeffs396 Quote Link to comment Share on other sites More sharing options...
my66s55 Posted May 10, 2012 Share Posted May 10, 2012 I have a scale ruler but, also use this scale converter for same calculations: http://jbwid.com/scalcalc.htm Quote Link to comment Share on other sites More sharing options...
mr moto Posted May 10, 2012 Share Posted May 10, 2012 If you have a calculator all you need to do is take your 1:1 measurement and then divide by 25 to get the 1/25 equivalent. Same thing works for any scale - for 1/32, take the 1:1 and divide by 32, etc. No millimeters or scale rulers needed. Quote Link to comment Share on other sites More sharing options...
Harry P. Posted May 10, 2012 Share Posted May 10, 2012 If you have a calculator all you need to do is take your 1:1 measurement and then divide by 25 to get the 1/25 equivalent. Same thing works for any scale - for 1/32, take the 1:1 and divide by 32, etc. No millimeters or scale rulers needed. You need the ruler to measure the part in the first place! Quote Link to comment Share on other sites More sharing options...
mr moto Posted May 10, 2012 Share Posted May 10, 2012 You need the ruler to measure the part in the first place! You do need a ruler but not a scale ruler. Just the regular kind that everybody already has. Measure the real thing with a regular ruler and let's say it measures 25" (makes it easy!). Divide by 25 and that gives you 1". Then you know to measure 1" on your model with a regular ruler to equal what you measured on the 1:1. No scale rulers needed. Quote Link to comment Share on other sites More sharing options...
Harry P. Posted May 10, 2012 Share Posted May 10, 2012 You do need a ruler but not a scale ruler. Just the regular kind that everybody already has. Measure the real thing with a regular ruler and let's say it measures 25" (makes it easy!). Divide by 25 and that gives you 1". Then you know to measure 1" on your model with a regular ruler to equal what you measured on the 1:1. No scale rulers needed. Oh, I see what you mean. Right, no "scale ruler" needed. 1 mm = 1 inch in 1/25 scale. Quote Link to comment Share on other sites More sharing options...
Art Anderson Posted May 10, 2012 Share Posted May 10, 2012 I've always had the understanding that 1mm in 1/25 scale equals 1 inch in real life. Lately I have been building some chairs for a 1/25 build and they look more like kids chairs next to my Woody. I took measurements from chairs in my house and converted them from inches to mm. Anybody know why they appear too small? Thanks OK, some conversions: 25.4mm equals one inch. Drop the .4mm, as 1/25 of 4mm is beyond the possibilities of most all of us, unless we are attempting a micro-precision machined part for say, an operating scale model engine. So, 1mm can be said to equal on inch in 1/25 scale. The same is even more true in English measurements (which is what we traditionally use in the USA: 1" in 1/25 scale equals EXACTLY .040" (40 thousandths of an inch!--Evergreen Scale Models has all manner of strip styrene at .040"). So check your measurements more carefully--this is HS Math 101, frankly! Art Quote Link to comment Share on other sites More sharing options...
Nitro Neil Posted May 10, 2012 Share Posted May 10, 2012 Probably because your Woody in 1:1 is large, and your house chairs are relatively small in comparison And having a large Woodie is a problem why? Quote Link to comment Share on other sites More sharing options...
noname Posted May 10, 2012 Author Share Posted May 10, 2012 (edited) Good one Nitro Neil. Thanks for your comments guys. Here is a pic. Even though the chair looks a bit bigger in this photo, don't ya think it still looks a tad small? It is the chair I actually model in. Edited May 10, 2012 by noname Quote Link to comment Share on other sites More sharing options...
sjordan2 Posted May 10, 2012 Share Posted May 10, 2012 So, show us the chair you model in next to your own car. Looks good to me. As for the conversion question, just bookmark a conversion site like the one listed above. Quote Link to comment Share on other sites More sharing options...
noname Posted May 10, 2012 Author Share Posted May 10, 2012 I thought of doing that. The chair really does look smaller in real life. Any other opinions? Quote Link to comment Share on other sites More sharing options...
Dr. Cranky Posted May 10, 2012 Share Posted May 10, 2012 It's hard to say from the picture, but I find it works fine . . . Quote Link to comment Share on other sites More sharing options...
Eshaver Posted May 10, 2012 Share Posted May 10, 2012 Uh Noname , try this site and try out the calculator they have at the bottom of the page . http://www.scalemodelersworld.com/online-scale-converter-tool.html Ed Shaver Quote Link to comment Share on other sites More sharing options...
Mercman Posted May 10, 2012 Share Posted May 10, 2012 Maybe these will help. Hope this helps out. Quote Link to comment Share on other sites More sharing options...
SSNJim Posted May 11, 2012 Share Posted May 11, 2012 (edited) I've always had the understanding that 1mm in 1/25 scale equals 1 inch in real life. Close enough for small work - say, less than 6 inches or so. After that, you're no longer building in 1/25, you're building in 1/25.4 scale. There's nothing wrong with doing it; you just need to know that the quite small difference in measuring out a scale 2" becomes noticeable at 20", and glaring at 200". A 20" piece in 1/25 is .8" long; in 1mm=1" it is .7874". That's a difference of .0126" - in 1/25, that's around 1/3". Is that a problem? Probably not for chair legs, but if you're building a roll cage, or something intricate or repetitive, it could be a big one. A 100" wheelbase would be short by an inch and a half if you use 100mm to measure it instead of the proper 4". Cutting/marking errors do play a big part too; I usually cut items long and file them to fit/measurement. I'm the type to measure with a micrometer, mark with a crayon, and cut with an ax. Edited May 11, 2012 by SSNJim Quote Link to comment Share on other sites More sharing options...
1930fordpickup Posted May 11, 2012 Share Posted May 11, 2012 To convert MM to inches multiply by .03937. Quote Link to comment Share on other sites More sharing options...
Jordan White Posted May 11, 2012 Share Posted May 11, 2012 I have the same kit, so I took a measurement of the body height, which is about 2.5". In the picture, the chair appears to come up to just below the door handle (taking in to account the angle), which is approximately 1.375" high. Converting to 1:1, the body is about 62.5" high, or just over 5 feet. The chair is then approximately 35" tall, or just under 3 feet. That seems a little short to me. What are the dimensions of the actual chair? Quote Link to comment Share on other sites More sharing options...
noname Posted May 11, 2012 Author Share Posted May 11, 2012 (edited) Thanks for all your opinions and charts guys. Math was never my strong point. The chair has legs 16 inches long. My little guy has legs 14mm long. The back of the chair is 32 inches high from the floor. My scale chair is 31mm. The width of the front of the chair is 15.5 inches wide, and mine is 15mm. So I am off a tad, probably from sanding. I wouldn't think that little bit would make that much differnce. I did a rocking chair before this chair and that appeared small as well. Although it looks a little bit better than this chair. I actually took the 1:1 chair out and sat it beside my car. It actually looks small beside my car as well. So maybe I'm not that far off. It does come up higher to my door handle, but I'm not driving a Woody either. I am in the process of making a chair slightly bigger in mm than inches of the 1:1. It could be that this one "appears" more in scale. In starting this thread I was mostly interested in weather 1mm=1 inch is a good rule of thumb. It would appear that most of us is comfortable with this. I will have to look more at all the supplied charts. Edited May 11, 2012 by noname Quote Link to comment Share on other sites More sharing options...
62rebel Posted May 11, 2012 Share Posted May 11, 2012 well; i SAID i wasn't a math genius...... you proved it! i always use the architect's scale i've been using since Drafting class.... Quote Link to comment Share on other sites More sharing options...
SSNJim Posted May 12, 2012 Share Posted May 12, 2012 The chair has legs 16 inches long. My little guy has legs 14mm long. The back of the chair is 32 inches high from the floor. My scale chair is 31mm. The width of the front of the chair is 15.5 inches wide, and mine is 15mm. <snip> So maybe I'm not that far off. I took the liberty of figuring out what the size of your chair would be in 1/25 versus your model. First I divided 1 by 25, and came up with .04. I multiplied that times the length of your 1:1 chairs leg (16"), and multiplied that times 25.4 to get the size in mm: 16" = 16.25mm 32" = 32.5mm 15.5" = 15.75mm Looks like it is fairly close, but I would be interested in seeing the results of the second chair just for comparison's sake. Quote Link to comment Share on other sites More sharing options...
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