Idaholewis
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I thought i would bring this back up, with an added picture. I get asked this Question a lot. Folks aren’t exactly sure how to go about ordering, and getting what they want? A bullet mold is fairly spendy, you want to make sure and get it right, if you follow these instructions you will
Here We Go: I just copied Accurate Molds Tolerances here, and added .452 as example. Make sure you Read and understand this!
I want an "as cast" diameter as close as I can get to .452".
I have a diameter tolerance window of .002" for my molds.
When ordering a diameter such as .452", you can select:
Positive tolerance is usually desirable for driving bands.
Negative tolerance is usually best for bore ride noses or any application where a certain diameter cannot be exceeded and a sizing die won't be used on that portion of the bullet.
Centered tolerance might be desirable when powder coating, and tapered designs.
Using "Special Notes" on the online order form, you can refine your diameter request for bore ride, body diameter, whatever, to the 4th decimal place. Ordering to the half thousandth does not ensure precision to the half thousandth, it only helps you communicate the desired diameter range within that .002" window.
My mold cavities are actually turned to +/-.0001" tolerance, but I cannot guarantee resultant casting tolerance closer than .002" because of casting variables such as pour technique and temperature, mold block temperature, purity of alloy, etc.
When you get to the Tolerance Part, you Put the Diameter in that you KNOW you need to have. There is a “Drop down“ Bar next to that, When Click on it, you will see the 3 options. The Top option is PLUS Tolerance, the middle option is CENTERED Tolerance, and the Bottom option is NEGATIVE Tolerance
For example: Here you can see i am ordering .452 Diameter, using the PLUS Tolerance Option
Here We Go: I just copied Accurate Molds Tolerances here, and added .452 as example. Make sure you Read and understand this!
I want an "as cast" diameter as close as I can get to .452".
I have a diameter tolerance window of .002" for my molds.
When ordering a diameter such as .452", you can select:
- Positive tolerance (+.002/-.000) means the diameter will be AT LEAST .452" But could be as much as .454
- Negative tolerance (+.000/-.002) means the diameter will be AT MOST .452" but could be as small as .450
- Centered tolerance (+/- .001) means as close as possible to .452" Could be .451, .452, .453
Positive tolerance is usually desirable for driving bands.
Negative tolerance is usually best for bore ride noses or any application where a certain diameter cannot be exceeded and a sizing die won't be used on that portion of the bullet.
Centered tolerance might be desirable when powder coating, and tapered designs.
Using "Special Notes" on the online order form, you can refine your diameter request for bore ride, body diameter, whatever, to the 4th decimal place. Ordering to the half thousandth does not ensure precision to the half thousandth, it only helps you communicate the desired diameter range within that .002" window.
My mold cavities are actually turned to +/-.0001" tolerance, but I cannot guarantee resultant casting tolerance closer than .002" because of casting variables such as pour technique and temperature, mold block temperature, purity of alloy, etc.
When you get to the Tolerance Part, you Put the Diameter in that you KNOW you need to have. There is a “Drop down“ Bar next to that, When Click on it, you will see the 3 options. The Top option is PLUS Tolerance, the middle option is CENTERED Tolerance, and the Bottom option is NEGATIVE Tolerance
For example: Here you can see i am ordering .452 Diameter, using the PLUS Tolerance Option
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