Calculating Screw Thread Properties

Metric screw sizes are calculated as follows:

Minor diameter = Major diameter - (1.226869 x pitch)

Pitch diameter = Major diameter - (.649519 x pitch)

The tensile stress area = ((root dia + pitch dia) / 2)^2 * Pi/4

Inch screw sizes are calculated as follows:

Minor diameter = Major diameter - (1.299038 x pitch)

Pitch diameter = Major diameter - (.649519 x pitch)

The tensile stress area = ((minor dia + pitch dia) / 2)^2 * Pi/4

Calculate Optimum Diameter For Cutter Or Part

When machining, it is occasionally desirable to calculate the appropriate diameter of either the cutter (i.e. milling) or the workpiece (i.e. turning) when the Surface Feet per Minute are known, and the RPM's are established. 
The equation used in this calculation is:  Diameter =  (SFM  /  RPM)  /  (Pi * 12)

where, SFM = Surface Feet per Minute,
RPM = Revolutions per Minute, and
Pi = 3.141592654

When using DZynSource Mold Engineering Software to do the calculation, go to "Machining Calculations" / "Surface Feet Per Minute" and then choose "Diameter" from the option boxes.

Enter the RPM's and he surface feed per minute in the appropriate text boxes.  Press Calculate.  The answer appears in the Answer frame. 

Use the Clear button to clear all fields, however this is not necessary in order to do another calculation.  You may simply type over the previous entries.


You may send the page to your default printer by pressing Print.
Press Menu to return to the main menu selection area.

DZynSource Mold Engineering Software Feature List

DZynSource Mold Engineering Software Feature List

Unit Conversions Section - Over 300 separate conversions

Converter for Hours into Days or Weeks

D.C. Electrical Calculations: 9 Different Ohm's Law Calculations

Fluids Calculations:

Bubbler sizing Continuity Eq.
Equivalent Hydraulic Diameter - General Case
Equivalent Hydraulic Diameter - Annular Channel
Hydraulic Cylinder Calculations
Pneumatic Cylinder Calculations
Pressure Losses (Darcy's Equation)
Pressure Loss or Flow Rate Through an Orifice
Pressure Losses in Valves and Fittings
Reynolds Number Calculations

Galvanic Table

Gate Sizing: Hot Tip, Edge Gate, & Sub-Gate

Helix and Cam Angles

Hot Runner Checklist - set up as a word processor so you can add your own items.

Machining Calculations:

           effective Cutter Diameter
            Feed Rate / Feed Per Tooth
            Inches per minute <> Inches Per Revolution
            Surface Feet Per Minute
            Surface Roughness
            3-Sided Cutter Angle Calculator

Material Properties:

            36 different molds making steels, aluminums, and high conductivity alloys.

            Can open up to 4 properties lists for easy comparison.

Mold and Plate Weight Calculator: steel or aluminum, based on solid block size

Molding Calculations:

            Chiller Sizing, includes the number of BTU's of heat to be removed per hour, the gallons              per minute of  water required to remove the heat content of the plastic.

            Clamp force table, by material type

            Cooling Time Estimator - Ballman Shusman method

            Colorant Let Down Weight Calculator

            Minimum Mold Open Time- time for the highest part to drop below the mold

            Pounds or Kilograms of Material per hour

            Plastic Shrink Rate Table and Steel and Plastics Size Calculator

            Tie Bar Stretch

Production Calculations:

            Pounds or Kilograms of Material per hour (Second location, for convenience)

            Molding Capacity: single or multi-molds.  Parts per minute, hour, day, week,4 weeks, and year.

            Converter for Hours into Days or Weeks (Second location, for convenience)

            Number of cavities required, based on production needs.

            Number of plastic parts that can be molded in a given time.

            Time to mold a certain quantity of parts.

Runner Size Calculator

Strength of Materials Calculations:

            Beam Deflections, 9 different loading and support scenarios

            Circular discs, fixed or supported circumference, uniform load or spot load

            Round Cavity Expansion, due to internal pressure.  Through bore or blind pocket.

            Elastic Strain:

                        Uniform Cross-section, single material

                        Uniform Cross-section, two materials assembly

                        Tapered Cross-section, single material

            Hoop Stress

            Leader Pin Bend Calculator, with 1, 2, or 3 moving plates; with plate weight estimator

            Long Column with central loading, critical load calculator

            L/K Test to determine if the long column calculator is the appropriate method.

            Moment of Inertia Calculator, also calculates area, Radius of Gyration, Section Modulus,  and   distance to extreme fiber of 10 common geometric shapes.

          Mold Plate Expansion due to internal pressure.  Designed especially for side action molds.        Includes blind or through pocket comparison.

Surface Finish Tables: SPI/SPE comparison, RA vs. RMS inch and metric, grinding grit & VDI

Thermal Calculations:

            Thermal Expansion Coefficient calculator for 30 different mold making metals.  Calculate           expansion, initial size, or final size.

            Chiller Sizing, includes the number of BTU's of heat to be removed per hour, the gallons             per minute of  water required to remove the heat content of the plastic. (Second        location, for convenience)     

Thread Properties:

            Three wire size, also includes largest, smallest and best wire size.  Inch and metric.

            Pipe Threads: Tap drills size for N.P.T. and B.S.P.T. threads, with & w/out pipe reamer.

            Properties of Threads: includes major, minor, and tap drill diameters.  Also includes        tensile stress area and a torque calculator.

Trigonometry

            Circular segment calculator

            Decimal degrees to Degrees, Minute, Seconds Converter.  Works for both directions.

            Right Angle Trigonometry.

            Roll Dimension Calculator, Obtuse and acute angles.

            Sine plate gage block calculator.

            Tooling ball dimension calculator.

Unscrewing Mold Calculations

Vent Calculator

            Vent depth table, by material type.

            Vent width calculator.

www.dzynsource.com

New Release of DZynSource Mold Engineering Software

April 1, 2011

A new version of DZynSource Mold Engineering Software is live on our web site.  Now with more features than ever.  You can now calculate how much a mold cavity will expand, with either a through-hole, or a blind cavity pocket.

Circular disc bending and deflection can now be calculated.  This is great for check the strength of a round core with a top center gate.  There are a total 4 options in this section: perimeter fixed or supported with uniform load, or smaller concentric load on either support type.

There's a new capacity and utilization feature that covers single or multiple mold packages, and automatically calculates how many parts per day, week, 4 weeks, and per year all based on your input.

There are many more additions to the software, and I'll be posting on them in the near future.


www.dzynsource.com  or www.moldengineeringsoftware.com

Sønderborg Værktøjsfabrik A/S Purchases DZynSource Software

Jan Hansen, Tool Design Manager at Sønderborg Værktøjsfabrik A/S in Sønderborg, Denmark, is another new DZynSource customer.  Welcome Jan.

Another DZynSource Mold Engineering Software Commendation!

We have another new commendation:


“Every mold making company should own a copy. Great idea, great implementation.”

Jim Philippe / Tooling Engineer CORNING LIFE SCIENCES

Thank you, Jim.

New DZynSource Commendation!

We just received a new, and very nice, commendation about our software:


“ I am impressed with your software; talk about practical and useful! Anyone in the business can sure appreciate what you have done.”

Brett Niggel, Designer, Studio One Eleven

Thank you for the kind words, Brett!