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Making concentric drillings
harry_bott
Member Posts: 4 ✭
I am modelling a model engine piston and the drawings call for a pair of concentric drilling operations.
When I try to make the second smaller diameter drilling the depth control seems to break, it seems to jump from a very small depth to suddenly going through all. Hopefully the pictures make it clear what is going wrong.
Edit: The 6mm depth hole is just to illustrate that anything beyond 6mm just becomes a through hole. The first drilling is the larger diameter already there and works OK (0.433" Dia and 0.2" deep). I'm not trying to make two holes the same size on top of eachother. The actual drilling would be about 14mm deep and 11/32 diameter.
I have bodged it using an extrude and chamfer but curious to know if i am using the tool incorrectly or there is a better way of doing this.
Answers
Hey Harry. What I don't understand is why there are 2 drilling operations. If you were to actually do this in the order of the images of your post, the second operation of 5mm depth would remove no material since the hole is already 6mm deep and of the same diameter of the 6mm deep hole. If the order is reversed, the second (6mm deep) operation would remove some material in order to make the hole 1mm deeper. Are the two drilling operations supposed to be the same diameter? Perhaps I'm missing something.
- Scotty
Sorry, I can see thats confusing. That was only to illustrate a small change makes a big difference. The actual drilling would be 14mm deep. When I try at the moment anything beyond 6mm is just a through hole.
it'll give you a clue to what the issue is if you over over the red feature name in the dialog.
I see two problems: the second example doesn't have a "merge scope".
The second one is the start plane set to "start from part". I think you want it to "set from sketch plane".