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ET-1
![]() Larger Jacket Reduction If you have a jacket that can be reduced at least twice its wall thickness, then it is possible to build a single die that will both reduce and trim the jacket to a specified length. For example, to reduce from a .308 to a .284 is .014 inches of outside diameter reduction. If the walls of your .308 jacket are .007 or less, then it means the ID of the .308 jacket would be large enough to fit the .284 punch inside prior to drawing. But few .308 jackets are that thin. Most of them have closer to .020 inch walls (near the point of desired trim). ![]() ![]() However, there is a trick you could use. Instead of drawing the .308 down with the stepped trimming punch inside it, you could pre-expand the jacket in another die, with a tapered punch. Then, you could use the stepped punch to draw and trim it, because the punch would now fit inside the expanded portion of the jacket. This is the 2-die method of using an ET-1. The expander die is necessary when you wish to use the same caliber jacket before and after trimming, or when the trimmed/drawn jacket will be within two wall thicknesses of the original diameter. ![]() As you can see, the ET-1 system consists of various components that may be required when using different jackets or presses. Sometimes it is one die, sometimes it is two dies, and usually it requires some kind of ejector mechanism (disk and tube, or the -H ejector system). The price will depend on the specific jacket and press you wish to use. It is best to discuss this and send sample jackets to get a quote. |
ET-2
![]() The only drawbacks of the ET-2 compared to the ET-1 are:
![]() So long as there is a thin buffer of jacket material between the punch and the die, the ET-2 works very nicely. It is very quick to use, and is adjustable for length. The amount of material to be trimmed off the jacket is whatever projects beyond the die mouth. An internal punch supports the closed end of the jacket, inside the die. The distance this punch moves back before coming to rest in the ram, or in a reloading press die body, depends on a screw setting on the punch head. Moving the punch setting up and down changes the length of the trimmed jacket. ![]() At this setting, the punch cannot go any closer to the die, and therefore could not crush or roll over the edge of the die. With a jacket installed in the die, there would be no room for the jacket between the punch and die, and a thin film of material would be all that remained after the ram was raised. The mouth of the jacket is expanded in a cone, which may or may not split. If by chance the cone is separated from the jacket, it must be removed from the punch before another jacket is trimmed (it should come off very easily by finger pressure alone). More likely, the jacket will be left with the cone attached by a thin web at the trim line. Lower the ram, eject the jacket, and either snap off the cone by hand, or pinch it off with a pair of pliers (which should not affect the jacket beyond the trim line). Or put the jackets into a tumbler and let them knock the cones off as they roll around. Note that the trimmed jacket edge is sharp and beveled, and should be very cleanly cut. ![]() In the Hydro Press, there is a slight drift in the ram at the top of the stroke, which normally causes no problem. But in this case, it can over-stress the edge of the trim die. Set up the Hydro Press so that the ram stops at the mechanical limit of the cylinder, not using the top sensor. Move the top sensor so it is just above the limit of ram travel. Then turn on the pressure reversing switch, set the drive pressure to a reasonable level such as 800 psi, and set the reversing pressure to switch at a level below this (such as 750 psi). The actual pressure isn't important, because the die and punch are not what stops the ram if you use the cylinder limit position for a stop. Set the dwell time at the top of the stroke for 10-15 milliseconds, to allow a little "flow" time for the pinched jacket material, and to avoid a sudden shock wave in the hydraulic lines from changing flow direction too quickly. ![]() |
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