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Infobrief No. 44 for July/August 1997

Copyright by HEXAGON Software 1997

Result Printout for Intranet and Internet

Text printout in HTML Format

The text printout for all calculation programs can now be output as an HTML file for display in Netscape, MS Internet Explorer or StarOffice. This means that the calculation results can now be published or archived in Intranet or Internet. The results can also be output as a table for MS Excel or Qauttro Pro. This is ideal when you wish to work with the results in your own programs.

Working with HTML Forms

It is possible to extend and add drawings and diagrams from the calculation program to the HTML forms which were created by the calculation program. You can do this by loading the file into a text program with HTML features. We recommend StarOffice 4.0 by Star-Division, Hamburg. The created file is loaded and displayed under "File->Open". In order to insert a diagram or drawing, change to the window with the HEXAGON program, copy the required graphic into the clipboard with the key combination "ALT-PrtScr", change to the StarOffice window and copy the graphic to the required position under "Edit->Insert".

FED1..FED8: Material Data Base

The material data for the most common spring materials, has until now been included in the program as a fixed feature. With the new versions, the parameters are loaded from the data base FEDWST.DBF. This provides the user with the feature for adding new materials or altering individual values. A new field, "TMAX" for maximum working temperature, has been added to the data base. The program provides an error message when this value is exceeded.

Spring Materials in acc. with the Euro-Norm

The new specification of materials for spring steel and valve spring wires, in accordance with EN 10270, has now been included. The new material data base has four fields for specification: NAME1 for the new name, NAME2 for the description, NAME3 for additional information and NAME4 for the DIN specification or company name. All four text fields are included in the standard output. This enables the old DIN specification to be printed out during the changeover period along with the new EN material name.

FED1+,FED2+ Searching in the Spring Data Base

When searching for a spring in the stock list or a catalogue data base, the deviations from the calculated spring are now provided as well. This now makes it easier to pick the most appropriate spring when several different types are found. The search algorythm has been improved, the wait-time while searching in a data base with more than 1000 springs is now noticeabley shorter. The file name selected under "DataBase->File" is saved in the FED or FD2 file. With a "NULL" file you make adjust the defaults as required.

FED6 Quick Output

The FED6 Quick Output now includes a table with spring sections. The list of lengths and coil numbers is displayed when the number of segments is smaller than 20.

FED7 Quick Output

In FED6 and FED7 a table with the spring segments is now displayed when the number of coil sections is smaller than 20.

FED3 - Conversion

Very long springs can be calculated with FED3+. When the spring path is entered in revolutions, this must previously be converted into degrees.
1 U (revolution) = 360

Example: For alpha1 = 6 revolutions, you enter 6 * 360 = 2160. The spring ratio is output as Nmm/, analog to this it can be converted into Nm/U.
1 Nmm/ = 0.36 Nm/U

ZAR1+ Data Base Tool Profile

Until now, the datum profile of the tooth rod could be selected from three standard dimensions, or, the height factors, root radius and angle could be entered manually. With the new versions (ZAR1+ only), special tools can be listed in a data base. When entering a new datum profile, you will be asked if you wish to add the data to the data base. The ZAR1+ data base already includes the standard profile in accordance with DIN 867, the proterberance profile, the profile in accordance with DIN 58400 (fine tool technology) and DIN 5480 (toothed shaft), as well as one example each for high toothing, complementary pair and profile with tip edge fracture.

ZAR1+ Represation and Output

Under Windows, the specification for alpha kP0 and alpha prP0 were not completely shown during the online input of the toothing profile. The English auxiliary picture "PROFIL" showed the angle alpha kP0 incorrectly. The index for the selected picture for pinion bearing and tooth bearing is now displayed as a letter a, b, c... instead of 1, 2, 3.. etc. The diameter is included in the drawing for gear pair or planetary gears. I would like to thank Mr. Bertil Jonsson of Volvo Aero Turbins in Malmo for this improvement suggestion.

ZAR1 - Complementary Toothing

Due to the relatively low strength of plastics, the teeth made of polyamid or POM can be made thicker and the steel teeth thinner for gear steps with a steel pinion and gear made of polyamid or POM. This can be achieved by increasing the factor hfP0/mn of the pinion, and reducing the factor hfP0/mn for the gear. Accordingly, the factor haP0/mn for Gear1 will be small and larger for Gear2. In this case a special tool is required for both the pinion and the gear, in which the head and root heights complement each other. You can load a sample file from Internet under "www.hexagon.de/info44/komplem.zar".

The tool for the steel pinion with low head height and greater tooth height (haP0/mn=0.65, hfP0/mn=1.25) produces a part with a relatively thin tooth.

Complementary Toothing Gear 2

The tool for the opposing gear made of plastic, with greater head height and lower root height (haP0/mn=1.5, hfP0/mn=0.4) produces a part with a relatively thick tooth.

WN1 - Quick Output

The most important data for the pressed fit and the calculation results are shown on one page in the Quick Ouput.

WN1 - Elastic Strain

For elastic strain in the outer part, the stress in the area of the seam is constant to start with, before dropping off. This was until now, not taken into account, the stress and seam pressure for DF was calculated slightly too high.

SR1 - Permissible Surface Pressre

A new material has been added to the file "PRESSUNG.DBF" with the material data for the clamping piece. Recent measurements have shown that the values for the permissible surface pressure in Table 9 of VDI 2230 were not always correct. Some seemed too high, some too low, and others were correct. The tables from new measures have been added to the material data base. The existing materials, in accordance with VDI 2230 are still available, unchanged in the data base. Several of the materials now occur twice in the data base with different values. Until a new VDI 2230 is issued with corrected values, you can choose the current VDI 2230 values or the newer values. I would like to thank Mr Dose for providing us with the new tables.

SR1 - Flange Screws and Nuts

Threads in inches, help texts and auxiliary pictures have been added to the data base for flange screws and nuts.

FED1+ in Portugese

The FED1 programs for Pressure Spring Calculation are now also available in Portugese. Our pressure spring programs are now available in seven languages: German, English, French, Italian, Spanish, Swedish and Protugese.

WL1+ Shearing and Pressure Stress

Until now, the stress curve in WL1 didn't take shearing force affect on a bearing position, or two opposing forces cancelling each other out into account. This is a complicated case: For slighlty displaced force application on a sharp-edged lining surface, the shaft undergoes shearing stress. When the opposing forces cancel each other out, the shaft undergoes pressure. The effective cross-section can only be calculated with FEM. In most cases, the pressure and shearing stress caused by shearing force can be ignored, because the bending pressure is far greater. As the weakest part, caused by bending load, is at the tension side of the outer fibre of the shaft, the pressure stress caused by shearing force does not result in an increase in the reference stress.
When the option is set, WL1+ takes into account, approaching step by step, the shearing or pressure stress occuring due to shearing force, by increasing the shearing stress by tau=Fq/A. With A as the shaft cross-section with force application position. The increased shearing stress is applied in the area of the shaft around the force application point (x-d/2 through x+d/2).

Text Printout

For the result printout you will asked if the printout should be displayed on screen, sent to printer, Windows printer or sent to a file. The default until now was "Display on Screen". You can now alter this default in the printer configuration, it is also possible to have the question suppressed and the results printed out immediately.

HPGLVIEW - Display Cross-section

If you wish to display only a certain section of a drawing, you can enter the coordinates when loading the program. This may be necessary when you load HPGLVIEW with one of your own programs, and you wish to use HPGLVIEW to display different details of a compilation drawing. Command line:
HPGLVIEW file name xmin ymin xmax ymax
- xmin/ymin is the left-hand lower corner, and xmax/ymax is the right-hand upper corner of the displayed window in mm. - All parameters must be separated by blanks. It is also possible to define the screen center of the diagram and the width of the displayed area, the command line is then
HPGLVIEW file name x y l
with x and y as coordinates for the screen center and l as the width of the screen section in mm.