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Info Letter No. 50 - July/August 1998

Copyright by HEXAGON Software 1998

NT Versions

We now have 32-bit versions of our programs HPGLVIEW, HPGL Manager, DXF Manager and FED1+. They differ to the old Windows versions in their window arrangement and user elements. Long file and directory names are now supported. You can now save the documents under the part number, even when this is longer than 8 characters. In addition, the window interface has been improved. For example, if you wish to calculate a new spring with FED1+ under "File->New", there are now options for pre-dimensioning, dimensioning and recalculation. You can either select the spring forces and installation dimension form to calculate the necessary spring, or you can enter the dimensions of the spring for the recalculation.

When you save standard settings for the spring calculation under the file name "NULL", the default values are loaded each time you start the program.

Graphics, drawings and diagrams under the 32-bit versions are printed out in higher quality than with the 16-bit versions.



FED1+ Deviations and Tolerances

When entering the quality and tolerances, the deviations are shown in mm's in the input window on the right. This allows you to see immediately the effects of changing the quality class. When the quality class is changed, the deviations are immediately recalculated. By clicking on the "Input", you can enter the deviation manually.





NT Data base


With the integrated browse window it is now much easier to append or change materials, spring or calculation data in the data base.





NT Configuration

Configuration has now also been made easier and more user friendly. Directories and files, as well as text fonts and colours can be selected instead of entered. You can now select a font height factor for text to be shown in diagrams and drawings, as well as a font width factor. The background colour can be selected from the available Windows palette.





HPGLMAN / DXFMAN - Configuration

The configuration for the pens in the HPGL and DXF Managers has been improved. You can now configure the colour numbers for the DXF Manager, and the pen numbers for the HPGL Manager. When outputting as DXF or IGES files, different colours can be defined, for postscript different line thicknesses, and for CNC code different tool numbers and advancement increments.



HPGLMAN / DXFMAN NT

The 32-bit versions of the HPGL Manager, DXF Manager and HPGLVIEW are available now in German and English. FED1+ will be available from 15 September 1998. By the end of the year, all Hexagon programs should be available as 32-bit versions. The 16-bit and DOS versions will continue to be available. When converting to the new 32-bit versions all files and data bases from the old versions can be used.

The price for a disk-update to the new versions is 60DM per program (120DM when converting from MS-DOS). The prerequisite for an update, is that the licence contract was previously filled out and already sent back.



HPGL Manager Full Circle Conversion

Arcs with a starting angle of 0 degrees and an end angle of 360 degrees are given out as a "Circle" when converting to DXF.



DXFMAN, GEO1 - Unix Files

The end of the line is marked in PC text files with the characters #13#10 (Carriage Return, Line Feed). In Unix system files only the character 10 is used. This has caused difficulties when loading files to DXF from CATIA. DXFMAN and GEO1 have been modified so that Unix files can also be loaded without problem. I would like to thank Mr Baumgart of Porsche Engineering, Bietingen-Bissingen, Germany for this information and test files.




WL1/WL1+ Shaft Geometry from DXF Files

According to customer wishes, the shaft calculation program has had an import function added for DXF files. The shaft geometry no longer needs to be entered, but can be taken from CAD. Before this the shaft should be cut out of the drawing, all other parts, views, dimensions, drawing header, etc., should be deleted. The middle line of the shaft is either on, or parallel to the x-axis, the y-coordinates are required by WL1+. I would like to thank Mr Listner of Daimler-Benz, Untertrkheim, Germany for this suggestion.



WL1+ Calculation of Spur Gear Load

You should only use this input when you wish to calculate a shaft with more than two gear steps, otherwise you should preferably use the input under "Complex Load". Here any number of additional gear steps can be calculated. WL1+ calculates the resulting forces, path load and factors. If you wish to make changes, you should first delete the old values. In the newest version, the gear values are reset to zero when you start input to prevent the impression that the values already entered in "complex load" need to be calculated.



WL1 - Tension Stress with Hollow Shafts

With hollow shafts the calculation of tension and pressure stresses due to axial forces was not taking the inner diameter of the shaft into account, the program was calculating with the cross-section of a solid shaft. This only occurs with load due to axial forces, the values for the stresses from shearing loads, path loads and bending and torque are calculated correctly. Please check to see if this error occurs with your version. If you have registered your program by sending the licence contract back, you can request a free update. Please send the WL1 program disks back to us. I would like to thank Mr P”ppinghaus of Winhaus, Wahlhausen, Germany for bringing this to my attention.



2h3>TR1 - Tension/Pressure When the cross-section surface A has a negative mathematical sign, the tension and pressure stresses occur from the axial forces with a reversed mathematical sign (this occurs when the geometry is entered in a mathematically negative direction). The new version of TR1 calculates with the absolute value, so that tension stresses have a positive sign and pressure stresses have a negative sign.



TR1 - Reference Stress

A diagram with the reference stress over the x-axis has been added. The reference stress from bending and tension stress is obtained by simply adding Sigma b to Sigma z.



ZAR1+ Planetary Gear

For the preliminary concept of planetary steps the faxtor xS for the sun gear is recalculated when entering the addendum modification coefficient xH of the hollow gear.



ZAR1+ Addendum Reduction

For the standard geometry, where you can either enter clearance, addendum reduction or outside diameter, the program now also allows a negative clearance of -0,25mm. However, the error message "kmn<0!" will appear. I would like to thank Mr Brutschin of Rotzler in Steinen, Germany for this improvement suggestion.



ZAR1+ Tooth Forces

The tangential force due to the transfered torque does not apply to just one point, but is really a path load which is distributed over the whole application path. The greatest force occurs at the application point (operating pitch) and fills out both sides. When several teeth are applied at the same time, it becomes even more difficult. For the load-bearing capacity calculation of the teeth the tangential force in the generated pitch is used. The tangential force in the operating pitch is used for the calculation of shafts and bearing loads. Until now, the tangential force of the generated pitch, and the resulting axial, radial and normal forces were calculated. With the new version the tangential forces Ft (generated pitch) and Ftw (operating pitch) are printed out, normal and radial forces are calculated from Ftw and atw. 
 Ft = 2 * T1 / d1

Ftw =  2 * T1 / dw

Fx = Ftw * tan ß

Fr = Ftw * tan atw

Fn = Ftw / cos atw
Until now, Fx, Fr and Fn with Ft instead of Ftw were calculated. With addendum modification and a smaller number of teeth the error rate was up to 20%. I would like to thank Mr Langenberg of Deutsche Bergbautechnik in Lnen, Germany for drawing this to my attention.



Theories for Calculation of Toothed Shafts and Hubs with ZAR1

Due to changes in tooth height, ZAR1+ can also be used to calculate the geometry of toothed shafts and hubs in accordance with DIN 5480. In the directory TRAIN you will find a sample file STECKVZ.ZAR. Under "Edit->Quality" the deviations Asne and Asni can be entered freely. This allows calculation of span measurement for any tolerance.



SR1 - Minimum Screw-in Depth

On the internet "www.hexagon.de/dose/dose1.htm" you will find a publication by Mr Dose (Dipl.Engineer, G.F.) with the methods he developed for calculating the minimum screw-in depth for bolted joints as they are shown in SR1. The correctness of the calculation has been proven in tests. I would like to thank Mr Dose for providing me with the documentation.



SR1 - Calculation after "Quit"

Until now the program has not carried out a new calculation when you leave input with "Quit". The new version carries out a calculation with the newly entered values. For this suggestion I would like to thank Professor Zammert of the Polytechnic in Esslingen, Germany.



Spring Material VD-SiCr

The shearing modulus has been changed from 81500 N/mmı N/mmı (in accordance with Garphyttan Information from 1988 for Oteva 70) to 79500 N/mmı (in accordance with the Bosch standard). A shearing modulus G of 79500 N/mmı is shown in the current material data page (1998) by Garphyttan. I would like to thank Haldex in Duesseldorf, Germany for allowing us to use the data pages.



FED2+ Pre-Stress

Under dimensioning, recalculation and pre-dimensioning the largest possible sign > can be entered for F0, then the greatest possible pre-stress for spring steel wire in accordance with DIN 17223 is calculated. I would like to thank Mr Michel Uancea of Vanhulen, Herstal, Belgium for providing me with the calculation formula.



Seminar in Autumn 1998


Gearing and Gear Calculation (2 days)
Date: 14-15 October 1998
Instructor: Dr. Körner
Course cost: 1000,- DM

Vibration and Noise Behaviour in Gears
Date: 16 October 1998
Instructor: Dr. Mueller
Course cost: 500,- DM

Spring Calculation
Instructors: Schnitzer, Zammert
Date: 20 October 1998
Course cost: 500,- DM

Certification in accordance with DIN ISO 9001
Date: 13 October 1998
Instructor: Körner
Course cost: 400,- DM


Demo Version HPGLVIEW NT


There is a new demo version of the 32-bit HPGLVIEW. You can download it from the internet " www.hexagon.de/zip/hpvi32_d.zip. With HPGLVIEW you can for example, display and print out all the auxiliary pictures available in all of our programs (.plt files).
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