GRUMPA
11-21-2015, 02:05 PM
I mentioned I was going to make a thread on Hydroforming. Seems folks fire form some of the brass they convert, but since I don't have chamberings in a lot of what I convert I came up with my own way of Hydroforming.
Let's face it, there are companies that do offer Hydroforming dies but they aren't cheap. Not only that what they provide is on the "UNIQUE" side, so if something gets damaged your stuck until you order a new part and you get to pay there price once again.
What I did was get a lathe, and in my area those are very scarce, kinda like going Snipe hunting. Once I got the lathe my mind started to come up with all kinds of things to make, and this is but a fraction of it.
First I made a plug, this plug blocks the hole in the shell holder, but....it has to be big enough so when it's put in the press it wont just fall through the slot in the ram. And folks....You have to leave the primer in the case.
153875
I made it to fit kinda snug so getting it in the ram takes a little persuasion .
153876
Next I made what I call the plunger, it's nothing more than a grade"8" bolt machined to precisely fit the neck. And the neck is measured "AFTER" it's been run through the die. I didn't make it to just simply "drop in" the neck, but it has a slight resistance to it. It needs to be done precisely and polished to an 8 finish, which is almost as smooth as glass.The de-capping rod is removed from the die, this must be done because you need to make a guide to keep things inline with everything.
153877
The so-called guide is nothing more than a machined down bolt with the same thread as the die, and I just used the right size drill to bore the hole. Here's a picture of the rod and guide and notice how everything is inline, very little wobble between the rod and the guide. I fill the case with water till it's just below the case mouth, them put it in the shell holder and run it up in the die with the plunger removed. I insert the plunger "AFTER" the case is in the die, and give it 2 whacks with the brass hammer.
153878
Here's an older picture of the before and after. Notice the difference in the shoulder location, and the angle is different. It only takes me a couple of good whacks with my brass hammer to form the brass. Also take note that I have the press on a dedicated "METAL" bench, it was my old radial armsaw table. Trust me if you try something like this on a table with something on it you'll be surprised real quick how much stuff just falls off the table.
http://castboolits.gunloads.com/attachment.php?attachmentid=95240&d=1391279126
After Hydroforming I bring them in the shop and machine the head to spec. A person needs to be in control doing this, so since nobody makes a case gauge for these cases I made my own. And with some help from other members here, they sent me some factory (HARD TO FIND) cases that I based my gauge from. There's something called a gauge dimension that must be held and monitored at all times, so I wouldn't recommend trying something like this unless you have the proper tools. This is just a picture of a different conversion, but it's a good visual aid for folks.
http://castboolits.gunloads.com/attachment.php?attachmentid=134544&d=1426859682
Let's face it, there are companies that do offer Hydroforming dies but they aren't cheap. Not only that what they provide is on the "UNIQUE" side, so if something gets damaged your stuck until you order a new part and you get to pay there price once again.
What I did was get a lathe, and in my area those are very scarce, kinda like going Snipe hunting. Once I got the lathe my mind started to come up with all kinds of things to make, and this is but a fraction of it.
First I made a plug, this plug blocks the hole in the shell holder, but....it has to be big enough so when it's put in the press it wont just fall through the slot in the ram. And folks....You have to leave the primer in the case.
153875
I made it to fit kinda snug so getting it in the ram takes a little persuasion .
153876
Next I made what I call the plunger, it's nothing more than a grade"8" bolt machined to precisely fit the neck. And the neck is measured "AFTER" it's been run through the die. I didn't make it to just simply "drop in" the neck, but it has a slight resistance to it. It needs to be done precisely and polished to an 8 finish, which is almost as smooth as glass.The de-capping rod is removed from the die, this must be done because you need to make a guide to keep things inline with everything.
153877
The so-called guide is nothing more than a machined down bolt with the same thread as the die, and I just used the right size drill to bore the hole. Here's a picture of the rod and guide and notice how everything is inline, very little wobble between the rod and the guide. I fill the case with water till it's just below the case mouth, them put it in the shell holder and run it up in the die with the plunger removed. I insert the plunger "AFTER" the case is in the die, and give it 2 whacks with the brass hammer.
153878
Here's an older picture of the before and after. Notice the difference in the shoulder location, and the angle is different. It only takes me a couple of good whacks with my brass hammer to form the brass. Also take note that I have the press on a dedicated "METAL" bench, it was my old radial armsaw table. Trust me if you try something like this on a table with something on it you'll be surprised real quick how much stuff just falls off the table.
http://castboolits.gunloads.com/attachment.php?attachmentid=95240&d=1391279126
After Hydroforming I bring them in the shop and machine the head to spec. A person needs to be in control doing this, so since nobody makes a case gauge for these cases I made my own. And with some help from other members here, they sent me some factory (HARD TO FIND) cases that I based my gauge from. There's something called a gauge dimension that must be held and monitored at all times, so I wouldn't recommend trying something like this unless you have the proper tools. This is just a picture of a different conversion, but it's a good visual aid for folks.
http://castboolits.gunloads.com/attachment.php?attachmentid=134544&d=1426859682