I know I have seen in MR a chart that indicates the settings for a copier to change a drawing from one scale to another. But for the life of me I can not remember which issue. Is there a web site or some other place I can quickly go to retrieve this information as I would like to change over some drawings today? Specifically, I have a HO scale drawing I want to convert to O scale for a friend. Thanks.
To enlarge HO (1:87) to O scale (1:48), you will need to set the copier at
(scale from) / (scale to) x 100 = percentage enlargement (or reduction if less than 1)
In this case:
87/48 x 100 = 181%
An example of reduction would be HO to N
87/160 x 100 = 54%
Andrew
I have done some copying of plans but it has been so long I do not remember the ratios. That formula looks about right. I have found some copiers do not reduce or enlarge to the percentage that the say due to wear and some manufacturing tolerance.
I check the final copy with a scale rule to make certain the drawings are correct.
Shafferr,
In case you need it next time, the chart you’re looking for, titled “Converting scale drawing sizes:” ran in the “Workshop,” conducted by Keith Thompson. It is on page 24 of the September 1994 issue of Model Railroader. I keep a photocopy in a three-ring binder so that it’s always handy (and hard to misplace !).
Bob
NMRA Life 0543
Try the scale calculator site below, it can be downloaded to your desktop etc.
Masonjar, Are you by chance a teacher? Very good example.