Engineering Data Guided Keepers - Standard Lifters

1 Engineering DataGuided KeepersGuidance and Retention - All-In-OneThis product may be covered by one or more patents or patent for - Rev. 6 Engineering data - Guided Keepers - Pg. 2 Things to ConsiderMachining Required to Mount the GK BaseBelow are three factors that should be considered when choosing a Guided keeper style for your design. We offer many different styles in order to provide the best possible solution based on your tool application, die build process, and personal Required to Mount the Guide PinBushing LengthORORWhen the Pad is subjected to a side load, the Guide Pin makes contact with two primary areas (see red lines on thepicture to the left).The greater the distance between these areas, the less amount of movement that can occur.

2 Longer Bushings are important on pads with long Guide Pins and/or long longer bushing provides more surface area making contact with the Guide Pin, which extends the life of the times adding 30% to the length of the bushing can double the - 1 setupHoles would still need to be deburred by hand after machiningMachining - 2 setupsWorking SideBack SideWorking SideBack SidePocket Machined on Back Side provides location for Guide PinLocation: Bore HoleDrilled HoleLocation: Reamed HolesGK120-L2 = $ *Most Economical Base = $ Engineering data - Guided Keepers - Pg. 3If SL built tools we would ToolsGK120-L2($ )Here s Why ..Redundant screws in the Guide Pin Making it easier to assemble using one tap to hold the Guide Pin in place while installing the otherMedium ToolsGK180-L3($ )Large ToolsGK205-L4($ )Large Locating Diameter in the Pad Locating on the full diameter of the Guide Pin provides a great amount of surface area and supportIntegral Flange on the BaseNo loose flange clamps that could be misplacedLocked Base AssemblyRetaining Ring prevents screws from loosening during productionEngineering data - Guided Keepers - Pg.

3 4 What we have found based on direct feedback from Metal Stampers: It s always more cost effective to start with a quality tool design rather than re-engineer later on. If a Stamper needs to add a GK Unit(s) to an under engineered die condition it costs them 3-4 times as much as if the die was built with them originally. Pad applications that have a minimum of 3 or more GK Units compared to only 2 GK Units provides a much more robust application. The Pad is less prone to tipping, bushings last longer, and the assembly is stronger in a mis-hit situation. Based on the facts above, it is important to design your tools with an adequate number of Guided keeper units based on the application.

4 Although it is hard for SL to make a recommendation on the number of GK Units to use for every application, we have created a matrix to help as a general guide. The matrix gives you a general guideline based on what we have found are average conditions. Please use this information, along with your discretion, to determine the number of GK Units to use in your specific application.*SL provides these recommendations for the following reasons: To save you time and money To ensure your dies produce quality parts To ensure press operator safetyDisclaimers: This is only a Guide - Discretion must be used based on each die application in regards to the number of Units to design in.

5 It s your responsibility to design a die that is adequately engineered. If there is known side load that will be subjected on the Pad, we recommend adding heel blocks. The calculations are based on a Standard crank press cycle. If the press has an accelerated up cycle, such as a double action press or a programmable hydraulic press, then the number of Units used should be Application RecommendationsEngineering data - Guided Keepers - Pg. 5 How we calculated the # of UnitsWeight and Speed are the two main factors that generate Impact Forces. The weight of the pad is important, but even more crucial is taking into account how fast (SPM) the Tool will be running and how much the Pad will affects Impact ForcesThe speed of the Slide/Upper Shoe at the time of impactOther data used in the calculation 6-Times Safety factor for the GK Units - for fatigue An average press travel, or slide stroke of 16 - 18 was usedThe weight of the pad is a known value, but a much more advanced calculation is the speed of the Slide/Upper Shoe at the time of impact on the Guided keeper .

6 See below for this calculation explained in simple Press Cycle (revolution) - Standard Crank PressTotal Slide StrokePress Speed CurveDistance from Bottom Dead CenterPad StrokePoint of Impact(when the upper shoe Lifts the Pad)The speed of the Press Slide ramps up The further up the curve the point of impact is located, the faster the slide is traveling and thus increasing the impact force on the AssemblyEngineering data - Guided Keepers - Pg. 6 Example: A 325lbs Pad with a 3 Pad Stroke and a press stroke of 40 SPMR ecommendation: Qty of 4 Units Dia. Guide Pin 2 Bushing LengthMinimum Recommended Bushing LengthMinimum Recommended Bushing LengthMinimum Recommended Bushing LengthEngineering data - Guided Keepers - Pg.

7 7 Minimum Recommended Bushing LengthMinimum Recommended Bushing LengthMinimum Recommended Bushing LengthEngineering data - Guided Keepers - Pg. 8If you would like Standard Lifters to run a calculation on your specific application please email us all of the information at data - Guided Keepers - Pg. 9GK Locking Collar - AccessoryO-ring maintains the radial location and prevents collar from falling out during disassemblyTapered groove forces Retaining Ring down which provides locking force to the Cap ScrewsThe GK Locking Collar prevents screws from possibly coming loose and falling into the tool during operation. Machining Required: Simple Round PocketNote: This is an optional accessory that some stampers require in their tools.

8 *Available for GK205 and GK180 Series Guide PinsEngineering data - Guided Keepers - Pg. 10 Application Tips - Prevent Tipping Apply Stand-offs to pressure pads & Lifters to maintain parallel ( flat ) travel. Pad tipping breaks screws, wears out pins/ bushings, and gas springs. To ensure the Pad/Lifter does not tip during the working stroke, apply enough pressure to keep it balanced and flat. Applying pressure in a balanced pattern will safeguard the pad from ShoeDie ShoePressure PadLifterPartial StockStand-offsEngineering data - Guided Keepers - Pg. 11 Application Tips pin to fool-proof assembly Offset one Guided keeper location or use different diameter pin as methods to fool-proof the assembly.

9 Use a minimum of three Guided Keepers per this condition has proven to be more robust. The Pad is less prone to tipping, the bushings will last longer, and the assembly is stonger in a mis-hit data - Guided Keepers - Pg. 12 Product # StructureGK SeriesBase StyleEnglish/MetricPin : Pin LengthDetermines Taps and Reams in Guide Pin EndPrimarily determines any Fasteners, Taps, Reams in the BaseMeasure to the Steel Shoulder not the Dampening WasherBases AvailableBase Location MethodBore / BodyReams / DowelsBushing Guide PinSeriesAdd per .125 L2L3L4H2H3AD2D3GK70(.75 )$.25$ ( )$ ( )$ ( )$ ( )GK75(.75 )$.25$ ( )$ ( )$ ( )$ ( )GK95( )$.75$ ( )$ ( )$ ( )$ ( )$ ( )$ ( )GK105( )$.

10 75$ ( )$ ( )$ ( )$ ( )$ ( )$ ( )GK120( )$.75$ ( )$ ( )$ ( )$ ( )$ ( )$ ( )$ ( )GK150( )$.75$ ( )$ ( )$ ( )$ ( )$ ( )$ ( )GK175( )$.75$ ( )$ ( )$ ( )$ ( )$ ( )$ ( )$ ( )GK180( )$.75$ ( )$ ( )$ ( )$ ( )$ ( )$ ( )GK200( )$1$ ( )$ ( )$ ( )$ ( )$ ( )GK205( )$1$ ( )$ ( )$ ( )$ ( ) Engineering data - Guided Keepers - Pg. 14 FAQ How do I determine the Guide Pin Length? Measure from the steel shoulder to the mounting surface, see picture on pg 12 of this booklet. Why aren t the mounting holes on the L-bases in the same location for the English and Metric versions? The English and Metric fasteners do not have the same head size.