Hi all,
Just as a matter of interest I thought I'd throw this out there.
A while ago I messed up one of my acu-rite glass scales ( boo-hoo!)
It goes off for repair and I mounted a Chinese glass scale as a temp
replacement.
This is mounted on the X of my Cinci contoumaster. Year of manufacture 1963.
I did the same data collection on my acu-rite and it came up dead on for
all values.
Both are 5 um scales.
The screw values were taken off the hand crank adjusted as close to zero
as my eyes can determine.
I didn't bother to use a glass on the dial. Of course all values were
approached from the low side. The ball
screw has about 0.004 backlash.
The 1 um scales are not much more than the 5 um scales which makes
almost no real difference if you are
hand cranking but for servo use the extra counts may help tuning the servo.
screw dro dev
0 0 0
1 0.9986 0.0014
2 1.9992 0.0008
3 2.9996 0.0004
4 3.9998 0.0002
5 5 0
6 6 0
7 7 0
8 7.9998 0.0002
9 9.0002 -0.0002
10 10.0002 -0.0002
11 11 0
12 12.0002 -0.0002
13 13.0002 -0.0002
14 14.0012 -0.0012
15 15.001 -0.001
16 16.0012 -0.0012
17 17.0000 0.0
18 18.001 -0.001
19 19.0012 -0.0012
20 20.0014 -0.0014
21 21.001 -0.001
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