Inside graces are used with inside rounds. Outside graces are used with outside rounds. Graces determine when shift start and end times round to the previous increment and when they round to the next increment. For example, the start time is 7:00 A.M., the change point is :12, the inside round is :13 and the inside grace is :00. Set the round to one minute more than the change point. To include the change point in the inside interval, use the “extra-minute” trick. Inside Round - Inside round apply during inside intervals, and are less than change points.Change points determine when the outside intervals occur. Outside rounds are used with outside graces. Outside Round - Outside rounds establish the increments for punches and inferred amount end times that occur during the outside interval.Punches that do not occur during the inside interval use outside rounds and graces. For example, if the end time is 3:30 and the change point is :15, any punch between 3:30 and 3:45 uses the inside rules. Late inside rounds and graces apply to punches and amount end times that occur after the scheduled start or end time and before the change point. and the change point is :30, any punch between 6:30 A.M. Early inside rounds and graces apply to punches and amount end times that occur after the change point and before the scheduled start or end time.įor example, the start time is 7:00 A.M. If inside rounds are tenth hours (:06), the change point is a value such as: 12,18,24,30. Usually, change points are a multiple of the inside round. If inside rounds and graces are not used, leave the change point at 0:00. Then click "Calculate", and the dwell time will be displayed.Use the following information for the In-punch and Out-punch tabs.Įarly Punch Rounding and Late Punch RoundingĬhange Point - Change points determine when inside and outside rounds and graces apply to punches and to inferred end times. Finally, enter the speed in rpm that you are running the machine at.The head flat of your tooling is the size of the flat section on the top of the head of the punch, as shown below: You will then be asked to enter the name of the tooling and the size of the head flat in mm. If you are not using one of the standard tooling sizes listed, then select "Other". Next, select the tooling you are using from the drop-down menu.If you do not know this it will be available from your manufacturer. The Pitch Circle Diameter is the distance from the centre of one die to the corresponding die on the other side of the press. If you are not using an LFA machine select "Other" and then enter the make and model of your machine along with the Pitch Circle Diameter in mm. Select your machine from the drop down menu.To use the Dwell Time Calculator, take the following steps: This is because the energy created when compressing the tablets has time to dissipate and does not allow for the elasticity of the powders to spring back. The longer the dwell time, the harder the tablet will become. rpm = revolutions per minute (turret speed)ĭwell time is then expressed in ms (milliseconds).Dpc = pitch circle diameter of turret (millimeters).The dwell time is calculated in the following way: Understanding this will help you scale up from small scale R&D to batch production of your tablets. The Dwell Time Calculator built by LFA is designed to help you work out how long your tablet is under maximum compression.
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