steamandsteel
Aluminum
- Joined
- Oct 21, 2017
- Location
- Wichita, KS
Hello,
This past winter, I set about restoring a 100lb drop hammer to be used at a business to strike coins from scratch. We have been testing with some pieces of aluminum, but have been getting a double-strike on the coins. As soon as the ram contacts the top of the die shoe, the first impression comes out great. However, it jumps a bit, making the coin rotate/move ever so slightly, and then falls back down, putting another image/half image on the surface of the blank.
- I have tried adding a spring to the assembly, but then I have to raise the ram higher to overcome spring pressure. However, with the higher height, it still bounces and restrikes.
- I've also thought about a bushing to fit over the die to match the size of the round coin blanks we will be using.. When the metal expands into the bushing, it'll get stuck a bit and prevent it from hopping out or rotating. That's the thought at least.
- We've been toying around with the idea of a piece of leather/gasket material with a center hole to hold the blanks in the middle and keep them from hopping out. Maybe secure the piece of leather on four posts around the bottom die.
I'm looking for any and all ideas on eliminating a secondary strike from the ram bouncing. I appreciate anything you guys can suggest.
This past winter, I set about restoring a 100lb drop hammer to be used at a business to strike coins from scratch. We have been testing with some pieces of aluminum, but have been getting a double-strike on the coins. As soon as the ram contacts the top of the die shoe, the first impression comes out great. However, it jumps a bit, making the coin rotate/move ever so slightly, and then falls back down, putting another image/half image on the surface of the blank.
- I have tried adding a spring to the assembly, but then I have to raise the ram higher to overcome spring pressure. However, with the higher height, it still bounces and restrikes.
- I've also thought about a bushing to fit over the die to match the size of the round coin blanks we will be using.. When the metal expands into the bushing, it'll get stuck a bit and prevent it from hopping out or rotating. That's the thought at least.
- We've been toying around with the idea of a piece of leather/gasket material with a center hole to hold the blanks in the middle and keep them from hopping out. Maybe secure the piece of leather on four posts around the bottom die.
I'm looking for any and all ideas on eliminating a secondary strike from the ram bouncing. I appreciate anything you guys can suggest.