Jumping Frog
07-17-2009, 05:16 PM
After getting everyone's help in the thread "Lyman-enting version of Lee-menting? (http://castboolits.gunloads.com/showthread.php?t=57576)", I prepped my new Lyman 4 cavity mould: 45 Auto - #452630. These I cast some boolits using straight wheelweights.
In the above thread, people mentioned concerns about undersized or eccentric boolits with new Lyman moulds. I measured the diameter for 25 sample boolits in two dimensions using a micrometer. Once along the mould part line and then at right angles to the mould part line. Measuring at right angle to the part line was pretty consistently small than measuring along the part line.
I am asking for feedback on two aspects of the numbers.
First, the average eccentricity is 0.0008" (8 ten-thousandths), with a maximum eccentricity of 0.0022" (22 ten-thousandths). Is this degree of roundness acceptable quality, or should I be complaining to Lyman.
Second, 14 or 25 (56%) of the boolits measured less than 0.4510" when measured at right angle to the part line. Slightly small. I figure if I complain about this they will simply point out that I should use their faced "#2" instead of straight wheel weights.
I figure I'll load and shoot them next and see how they perform while undersized. However, I suspect I will find myself needing to hone these cavities out slightly after testing.
What do you think?
================================================== ===========
X is across part line
Y along part line
Average: X=0.4510, Y=0.4519, Difference=0.0008
Maximum: X=0.4528, Y=0.4536, Difference=0.0022
Minimum: X=0.4500, Y=0.4503, Difference=-0.0006
Std Dev: X=0.00066, Y=0.00064, Difference=0.00071
Samples
(sorted by X)
X=0.4500, Y=0.4522, Difference=0.0022
X=0.4502, Y=0.4515, Difference=0.0013
X=0.4504, Y=0.4515, Difference=0.0011
X=0.4504, Y=0.4518, Difference=0.0014
X=0.4505, Y=0.4503, Difference=-0.0002
X=0.4505, Y=0.4512, Difference=0.0007
X=0.4506, Y=0.4514, Difference=0.0008
X=0.4506, Y=0.4514, Difference=0.0008
X=0.4506, Y=0.4523, Difference=0.0017
X=0.4507, Y=0.4515, Difference=0.0008
X=0.4507, Y=0.4518, Difference=0.0011
X=0.4508, Y=0.4515, Difference=0.0007
X=0.4508, Y=0.4523, Difference=0.0015
X=0.4508, Y=0.4528, Difference=0.0020
X=0.4510, Y=0.4511, Difference=0.0001
X=0.4512, Y=0.4516, Difference=0.0004
X=0.4512, Y=0.4524, Difference=0.0012
X=0.4513, Y=0.4518, Difference=0.0005
X=0.4514, Y=0.4521, Difference=0.0007
X=0.4515, Y=0.4522, Difference=0.0007
X=0.4516, Y=0.4520, Difference=0.0004
X=0.4518, Y=0.4536, Difference=0.0018
X=0.4519, Y=0.4516, Difference=-0.0003
X=0.4521, Y=0.4523, Difference=0.0002
(sorted by Y)
X=0.4505, Y=0.4503, Difference=-0.0002
X=0.4510, Y=0.4511, Difference=0.0001
X=0.4505, Y=0.4512, Difference=0.0007
X=0.4506, Y=0.4514, Difference=0.0008
X=0.4506, Y=0.4514, Difference=0.0008
X=0.4508, Y=0.4515, Difference=0.0007
X=0.4507, Y=0.4515, Difference=0.0008
X=0.4504, Y=0.4515, Difference=0.0011
X=0.4502, Y=0.4515, Difference=0.0013
X=0.4519, Y=0.4516, Difference=-0.0003
X=0.4512, Y=0.4516, Difference=0.0004
X=0.4513, Y=0.4518, Difference=0.0005
X=0.4507, Y=0.4518, Difference=0.0011
X=0.4504, Y=0.4518, Difference=0.0014
X=0.4516, Y=0.4520, Difference=0.0004
X=0.4514, Y=0.4521, Difference=0.0007
X=0.4515, Y=0.4522, Difference=0.0007
X=0.4500, Y=0.4522, Difference=0.0022
X=0.4521, Y=0.4523, Difference=0.0002
X=0.4508, Y=0.4523, Difference=0.0015
X=0.4506, Y=0.4523, Difference=0.0017
X=0.4512, Y=0.4524, Difference=0.0012
X=0.4508, Y=0.4528, Difference=0.0020
X=0.4518, Y=0.4536, Difference=0.0018
In the above thread, people mentioned concerns about undersized or eccentric boolits with new Lyman moulds. I measured the diameter for 25 sample boolits in two dimensions using a micrometer. Once along the mould part line and then at right angles to the mould part line. Measuring at right angle to the part line was pretty consistently small than measuring along the part line.
I am asking for feedback on two aspects of the numbers.
First, the average eccentricity is 0.0008" (8 ten-thousandths), with a maximum eccentricity of 0.0022" (22 ten-thousandths). Is this degree of roundness acceptable quality, or should I be complaining to Lyman.
Second, 14 or 25 (56%) of the boolits measured less than 0.4510" when measured at right angle to the part line. Slightly small. I figure if I complain about this they will simply point out that I should use their faced "#2" instead of straight wheel weights.
I figure I'll load and shoot them next and see how they perform while undersized. However, I suspect I will find myself needing to hone these cavities out slightly after testing.
What do you think?
================================================== ===========
X is across part line
Y along part line
Average: X=0.4510, Y=0.4519, Difference=0.0008
Maximum: X=0.4528, Y=0.4536, Difference=0.0022
Minimum: X=0.4500, Y=0.4503, Difference=-0.0006
Std Dev: X=0.00066, Y=0.00064, Difference=0.00071
Samples
(sorted by X)
X=0.4500, Y=0.4522, Difference=0.0022
X=0.4502, Y=0.4515, Difference=0.0013
X=0.4504, Y=0.4515, Difference=0.0011
X=0.4504, Y=0.4518, Difference=0.0014
X=0.4505, Y=0.4503, Difference=-0.0002
X=0.4505, Y=0.4512, Difference=0.0007
X=0.4506, Y=0.4514, Difference=0.0008
X=0.4506, Y=0.4514, Difference=0.0008
X=0.4506, Y=0.4523, Difference=0.0017
X=0.4507, Y=0.4515, Difference=0.0008
X=0.4507, Y=0.4518, Difference=0.0011
X=0.4508, Y=0.4515, Difference=0.0007
X=0.4508, Y=0.4523, Difference=0.0015
X=0.4508, Y=0.4528, Difference=0.0020
X=0.4510, Y=0.4511, Difference=0.0001
X=0.4512, Y=0.4516, Difference=0.0004
X=0.4512, Y=0.4524, Difference=0.0012
X=0.4513, Y=0.4518, Difference=0.0005
X=0.4514, Y=0.4521, Difference=0.0007
X=0.4515, Y=0.4522, Difference=0.0007
X=0.4516, Y=0.4520, Difference=0.0004
X=0.4518, Y=0.4536, Difference=0.0018
X=0.4519, Y=0.4516, Difference=-0.0003
X=0.4521, Y=0.4523, Difference=0.0002
(sorted by Y)
X=0.4505, Y=0.4503, Difference=-0.0002
X=0.4510, Y=0.4511, Difference=0.0001
X=0.4505, Y=0.4512, Difference=0.0007
X=0.4506, Y=0.4514, Difference=0.0008
X=0.4506, Y=0.4514, Difference=0.0008
X=0.4508, Y=0.4515, Difference=0.0007
X=0.4507, Y=0.4515, Difference=0.0008
X=0.4504, Y=0.4515, Difference=0.0011
X=0.4502, Y=0.4515, Difference=0.0013
X=0.4519, Y=0.4516, Difference=-0.0003
X=0.4512, Y=0.4516, Difference=0.0004
X=0.4513, Y=0.4518, Difference=0.0005
X=0.4507, Y=0.4518, Difference=0.0011
X=0.4504, Y=0.4518, Difference=0.0014
X=0.4516, Y=0.4520, Difference=0.0004
X=0.4514, Y=0.4521, Difference=0.0007
X=0.4515, Y=0.4522, Difference=0.0007
X=0.4500, Y=0.4522, Difference=0.0022
X=0.4521, Y=0.4523, Difference=0.0002
X=0.4508, Y=0.4523, Difference=0.0015
X=0.4506, Y=0.4523, Difference=0.0017
X=0.4512, Y=0.4524, Difference=0.0012
X=0.4508, Y=0.4528, Difference=0.0020
X=0.4518, Y=0.4536, Difference=0.0018