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Question:

The drawing of thimble holes in the middle axis of mechanical drawing

The thimble hole of the painting, please answer, thank you

Answer:

Of course, the central hole can be drawn by the method of partial dissection, but it is usually solved by the method of annotation. The central hole is more complex, so you can search the Baidu library for "center hole" annotations". Http://wenku.baidu /view/11f21c16c5da50e2524d7fa9.html
This is in the mechanical design manual, and finally, whether to retain the top pin, I do not remember the specific, and tomorrow can go to the company to help you see
Is the thimble bore the center hole in the standard?The center holes of the national standard drawing drawing a lot, can check the specific GB/T 145-2001

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