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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0003893||PartDesign||Feature||public||2019-03-08 22:32||2021-02-06 06:43|
|Priority||normal||Severity||feature||Reproducibility||have not tried|
|Summary||0003893: Counterbore and countersink with top clearance|
|Description||According to this forum discussion it is sensible to extend thePartDesign hole feature:|
- Countersink should have an additional (counterbore) depth at the top
- Countersink and Counterdepth should both provide the possibility for top clearance (reversed through all).
This image is linked from the forum discussion:
|Tags||No tags attached.|
||Branch for test: https://github.com/eivindkv/FreeCAD/tree/Fix_issue_3893|
* Set the depth of the (useable) thread (Usually this can be made in combination with the hole depth, see below)
* Option: Set the depth of the bore without the angled point, i.e. set the useable bore depth instead of the total depth.
I know there are some rules for tapped blind holes how deep the core hole should be and how long the threaded part ist. But I can not find them right now...
I think it was like useable thread + 4 times the screw pitch or something like that.
The reason is that a normal tap has some non cutting threads in the beginning.
Other CAD packages:
The Counterbore + Countersink parts could be also available for tapped holes - in German this is called "Stufenbohrung"
(Although the question is if this is really needed...)
Another useful feature would be to have two default counterbore settings: A shallow one (which is the current counterbore setting) and a deeper one, where the head of a ISO4672 screw is completly hidden.