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Jacket maker kit,, type -S
 
Jacket maker kit,, type -S Quantity in Basket: None
Catalog No.: JMK-1-S
Price: $3,450.00
Shipping Weight: 4.00 pounds
 
Main jacket caliber:
452, 1-in x .030 strip
224 (5.56mm), 5/8 x .030 strip
243 (6mm), 7/8 x .030 strip
 
Quantity:
 
The JMK-1-S jacket maker kit turns 1-inch wide x .030-inch thick copper strip into .45 caliber pistol jackets of about 0.7 inch length, adjustable for shorter lengths with the included jacket trim die. It can also be ordered in a version that makes a .224 jacket using a .030 x 5/8-in wide copper strip. The .224 jacket can be redrawn to make sub-calibers. Also we make a version that uses 7/8-in wide x .030 strip to produce 6mm jackets.

To make other calibers such as 9mm, 10mm (40), 30 and 7mm, you will need to add JRD-2-S draw dies and ET-2-S trim dies to go from a practical starting point to the desired diameter, length and wall thickness that is practical for the volume in the starting disk size. A chart is provided below to help with your selection. Blanking strip into disks using a CSP-1 S-press (not included in kit)

Caveats:
The type -S press and jacket maker cannot draw jackets from strip thicker than .030-inches, nor wider than 1.0 inches. The diameter and length, which together with wall thickness define the volume of material required, are limited to the lengths shown below for each diameter, and to no more than about .014-.020 inch wall thickness.

It is easier to use the CHP-1 Hydro Press for strip jacket making. If a hand press is used, the long handle option is a virtual necessity to get the leverage required to push the length of the jacket through the draw dies. Unlike bullet swaging, where the pressure is almost entirely at the end of the stroke and leverage is very high, jacket drawing requires signficant pressure for ram travel to match the entire jacket length.

This means the press is working in a lower-leverage ratio portion of the stroke at the start of the draw. Be prepared for considerable effort to go from a disk to a cup and from a cup to a longer, thinner walled jacket. With each successive draw, maintaining the wall thickness helps reduce effort. But conversely, the jackets become longer, so you start the draw lower in the stroke and have less leverage to do it.

Bottom Line: It works, but does require significant effort and the long handle option. Be aware of this before deciding on the use of a hand press versus the Hydro-Press.

The JMK-1-S consists of these components, for use in your existing CSP-1 S-press (press not included):
  • Blanking Die and punch
    Cuts disks from the copper strip as you pull the strip through a slot and move the ram and punch up and down in a short distance.

  • Cupping Die and punch
    Accepts the disk and re-draws it into a large diameter, short wall cup

  • JRD-2-S Deep Drawing die, punch, and stripper set, first draw.
    The deep drawing jacket draw die aligns the cup, and reduces the diameter while thinning the jacket walls, thus elongating the cup. This is a first stage draw to reduce the amount of force that would be needed if one attempted to go directly to the final diameter, wall, and length. The wall thickness is reduced slightly from that of the cup, but not all the way to the final thickness.

  • JRD-2-S Deep Drawing die, punch, and stripper set, second draw. The jacket is now drawn to the desired or target size for the kit. It usually has a somewhat uneven mouth at this point, which will require the use of the trim die. The diameter and wall thickness is finalized. The length can be trimmed shorter as desired.

  • ET-2-S Trim Die.
    The jacket is now trimmed to make the mouth even, and/or to produce the desired length of jacket. The trim die adjusts over a moderate range, and can handle a different range if an additional internal punch is ordered later to fit it. If we know the particular length you desired, we can provide a punch in this trim die that will handle that length easily and give you some range on either side of it.

Other smaller calibers can be drawn (and trimmed) using the cup as a starting point, using the intermediate drawn jacket, or using the final jacket. Add a JRD-2-S jacket reducer die and an ET-2-S jacket trim die for each additional caliber.

The combination of caliber, length and wall thickness is a constant: that is, the volume of metal you have in the disk does not increase, so each jacket you want to make must have specifications that use no more than that volume. You cannot make the wall thickess larger with later stages, only the same or thinner. So for example you can redraw the .449-diameter (45 cal jacket) WITH .750-in length and 0.015 walls to a 9mm or .38 caliber by going first to .40 caliber at about 0.925 length, then trim to reduce length so you have enough press clearance, and redraw to .426-diam (44 cal jacket), and then to .352 (9mm/38 jacket). The 9mm jacket will have .015 walls (no change from the .45 jacket) but by now will be about 1.125 inches long! It will need to be trimmed for use in most handgun bullets.

The smaller the caliber, the longer the jacket can be, but also the wall thickness will become thinner. Minimum practical jacket walls are about .010 inches, but we try to avoid walls thinner than about 0.014 inches if possible.

For heavier walls, larger calibers, or longer jackets in combination with the other two parameters, the -H type jacket making kit is required. The power of the Hydro-press is needed for making thicker or wider strip into disks, which can be drawn to make a higher volume cup.

The JMK-1-S set can be adapted to the -H type press, but the dies and punches are not designed for drawing longer and heavier jackets even if so adapted. However, if you purchase the CSP-1 hand press and JMK-1-S jacket maker, and later add a Hydro-Press, the same jackets can be made with less effort by adapting to the larger press. It just will not extend the capability or range to do so.

Here are the draw steps for the .45 caliber jacket maker version:
  1. 1-in x .030 strip to .970-in disk.
  2. .970-disk to .660 x 0.025 thick x 0.15 long cup
  3. .660 x .025 cup to .500 x .020 thick x 0.56 long jacket
  4. .500 x .020 x .560-L to .449 x .015 thick x 0.75 long jacket
  5. .449 x .015 TRIM to desired length (.452 target jacket)


Here are the draw steps for the .22 caliber jacket maker version:
  1. 5/8 x .030 strip to .595-in disk
  2. .595-disk to .390 x .025 thick cup x 0.23-in long
  3. .390 x .025 x .230 cup to .290 x .020 thick x .42-in long jacket
  4. .290 x .020 x .420-L to .221 x .014 thick x .700-in long jacket (.224 target jacket)


Here are some other practical draws you can make by adding other JRD-2-S draw dies and ET-2-S trim dies:
  • .500 x .015 thick x .56 long to .397 x .015 X .925-in long (40 or 41 cal jacket)
  • .449 x .015 thick x .75 long to .426 x .015 x .755-in long (44 cal jacket)
  • .449 x .015 thick x .75 long to .352 x .015 x 1.125-in long (9mm/357 jacket - needs a trim for pistol length)
  • .352 x .015 thick x 1.07 long (trimmed) to .305 x .015 x 1.250-in long (308 jacket)
  • .352 x .015 thick x 1.07 long (trimmed) to .281 x .015 x 1.375-in long (284 or 7mm jacket, must trim)


We also can make special versions of the jacket maker for producing 6mm (.243) jackets using 7/8 x .030 strip. The 6mm jackets produced can be re-drawn to make longer 224 jackets. The .221 x .014 x .700 jackets (22) can be redrawn to make 20 caliber (5mm) or 17 caliber jackets by additional JRD-2-S draw dies and ET-2-S trim dies. Also, modifications to the wall thickness can produce somewhat longer or shorter jackets in the same diameters, but going much below 0.014 walls can be problematic. Bear in mind the trade-off between length and wall thickness in any given diameter. Thicker walls with the same caliber and length need to start with thicker or wider strip, which in turn moves the operation to the Hydro Press and -H type jacket maker kits to handle the pressure and stroke requirements.



Related Item(s)
Code Name Price Availability  
JRD-2-S Jacket Reducing Die, Deep Draw $448.00  
CU30-100 Copper Strip, .030 x 1.00, 50-lbs $749.00  
CU30-625 Copper strip, .030 x 5/8-in, 50-lbs $749.00  
ET-2-S Jacket Trimmer Die, Type -S $249.00  
CSP-1 S-Press $739.00  
CHP-1 Corbin Hydro-Press $8,950.00  
CSP-1LH Long Handle for CSP-1 Press $79.50  



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