I was wondering if there is a quick and easy method the experts use for spotting and measuring die rotation on coins? As you can see from the photos I use a 2x2 flip with center lines which is time consuming. The severely rotated ones are easy to spot but in the case of this 1982 P the lesser rotated ones need to be checked and measured.
First, it is better if you use a 2x2 designed for the cent. The one that you used is probably for a quarter. The problem is that the coin can move inside the larger space and make your calculation inaccurate. You should also know that most dealers don't really care about rotated dies of less than 90 degrees, but if it is your desire to save those less than 90 degrees, then your complaint about using the 2x2 to measure the degree of rotation being time-consuming is rather moot. If you're going to save them, they might as well be in a 2x2 anyway. Did you plan to use some other method of storage? FWIW, I still consider using the 2x2 with the circular mylar opening the easiest way to calculate the degree of rotation because it is like the face of a clock. Each minute represents 6 degrees; each hour represents 30 degrees. You can't get any easier than that. Chris
The easiest method is, as you've done, presenting the reverse of the coin as if the obverse were flipped accurately along its' horizontal axis. That way, the image itself may be used as a basis for measurement. But as Chris mentioned, this small rotation isn't a point of interest to collectors.
Thanks for the poiners and information Chris, I actually have a piece of tape on one side that "locks" the coins in place, I use a dollar size 2x2 because I process change as I get it sometimes; I just happen to be working on 70lbs of pre-1983 pennies right now. I actually store most coins in 2x2's but I switched just last week to coin envelopes because if I store it in a 2x2 and then post it on a merchant site; typically someone wants more/different pics and I have to bust it open to retake them as my 2 microscope both have build in light sources. The time thing I understand and 64000 mills to 360 degrees and 32 points of 11.25 degrees for boxing the compass (Army Artillery & SF). The gist of my post was "How do you do it?" do you have a 2x2 with incremental lines between the 4 cardinal and do you measure clockwise, how far constitutes how many degrees, etc. Better methods or techniques wanted!
Thanks Superdave, now I know from you and Chris unless it is at least 90 degrees to spend it and the method I have works.
I have always enjoyed math, and mechanical drawing, drafting & AutoCAD have been my hobbies going back to the 7th grade. Measuring the degree of these angles isn't rocket science to me. I use my "mind's eye" to calculate the measurements. A horizontal line through the center of the circle represents 0 & 180 degrees. A vertical line represents 90 & 270 degrees. A diagonal line from corner to opposite corner is 45 to 225 and 135 to 315, respectively. I just imagine that the circular opening of the 2x2 is the face of a clock and the hours and minutes represent the degrees of an angle. You don't have to be that precise in measuring the degree of rotation of a coin. It's not like pointing at the moon and ending up on Jupiter. Maybe this will help you. Try making a template out of one 2x2 for each denomination - 1c, 2c, 3c, 5c, 10c, 20c, 25c, 50c, small $ & large $ - and use it whenever the need arises. Chris
Yes thanks Chris! I too have the same problem about the same amount of degrees off with a 20th anniversary reverse proof NGC PF69 silver eagle. It slipped past NGC so maybe not a big deal??
I doubt that it slipped past NGC. They will only attribute what is checked off on the submission form and paid for. Chris PS. Welcome to the neighborhood!
