The thread form is in accordance with BS 3643:2007 All dimensions in millimetres. (The data has not yet been checked against the latest revision. This standard has now been superseded by BS 3692:2001. This 'quick and dirty' approach isn't 100% correct, but is often good enough. The screw and nut sizes are in accordance with BS 3692:1967 (ISO 272 equivalent). Since the data is only used to a) size the 3D feature, and b) define the thread indication on the 2D drawing, I would probably not worry too much about the precise numbers to correctly represent the chosen class of fit - I'd just use 99mm as major dia, and (99-4)mm as minor diameter (and tapping drill dia), but make sure the naming detail gives the fit class details I want to appear on the drawing. For example BS 3643 gives detailed data on thread dimensions and fits for ISO metric threads across a wide range of diameters - there will no doubt be an equivalent in DIN and other standards giving similar data. M99x4 is a non-preferred size, you can use the data for 4mm pitch threads to derive the dimensions for M99x4 male and female threads. Specification for selected limits of size BS 3692:2001.ISO metric precision hexagon bolts, screws and nuts. I did not intend to imply any lack of intelligence - I was simply pointing out that 'hole wizard' is not included in the help file, it is officially called 'hole tool'. BS 3643 Part 2:2007.ISO metric screw threads. Document History Superseded by BS 3643-1:2007. Data for diameters from 1mm to 300mm are tabulated and an appendix gives the information necessary to calculate the limits of size for exceptions to the tabulated data. I attempted to answer the question that was asked, not the one that you didn't ask. Applies to single-start parallel screw threads having the ISO basic profile for triangular screw threads. My view has always been that (A) the "definition set" should be expanded and (B) that we, the users, should be building and sharing these definitions. Thus, you know the "data" you need to generate such "entries."
I have a spreadsheet ( Libre Office Calc format) that takes the basis data ( Designation:, Pitch:, Tap Drill (size):, Female Thread Class:, Female Thread Major Diameter:, Female Thread Minor Diameter:, Female Thread Pitch Diameter:, Male Thread Class:, Male Thread Major Diameter:, Male Thread Minor Diameter:, Male Thread Pitch Diameter:, and (as a validity list pull-down selection) Type Description: that "autogenerates" the Thread Type: designation to create "lists" that can be incorporated into your alibre_unicode_custom.thd definition set. Starting with the basics, the alibre_unicode_custom.thd definitions allow for: UNC, UNF, UNEF, Metric Coarse, Metric Fine, Metric Special, NPT, Generic Inch Thread, or Generic mm Thread "types" of threads.
0 kommentar(er)
