What does not make sense to you?
It is a fancy hole as described in step 5 of the instructions in your homework.
What incredibly craptastic dimensioning! Give the author maybe a C- due to poor placement.
Tony, the circled "hole" is created in the real world via WireEDM or Broaching.
There are other ways to get that shape (waterjet, laser, etc.) that I'm not listing because of the thickness and sharp corners.
I'm assuming the material is metal of some sort. (if material is not conductive WEDM won't work)
I don't know the tolerance of three place decimal dimensions or the angles. Knowing the tolerance would narrow down the available options for manufacture.
I don't know if there is an allowance for Radii on unspecified corners.
Surface Finish requirements?
Surface roughness requirements?
Break all edges or leave sharp?
I list all of this to give you a glimpse of real world manufacturing thinking. Much information is required to accurately and completely answer your question, or quote/manufacture a part.
The nearest I can tell it's a Dawg_Fork hole - or some would call it a Spline - so a Dawg_Fork Hole Spline
Hence the part name DAWG_FORK...
Anthony, are you asking what it is or how to make it?
Just 3D Print it and be done with it
I called in some help identifying it. . . What the Hell is that? Carl from Caddyshack 1st public appearance - YouTube
since I do not have the print in front of me the 1 thing I see is the extension lines from this vantage run into the part making it hard to tell what is a dimension line and an edge.
As far as the circular part although not the same thing exactly a shift fork inside a gearbox for a motorcycle has similar features to this but it is going on a spline shaft rather than an inverse taper lock round profile as this is.
In the end it is an instructional picture for a homework assignment and it is easily makeable in the cad world. Real world it would have to be processed accordingly. @ an inch thick depending on tolerance I would guess EDM, probably Sinker depending on qty and tolerance to manufacture the hole detail as far as the inverse taper locks.
I don't believe this is a good case for sinker. WireEDM definitely, as long as the raw material is conductive.
Sinker would be in my perfect world of 6 axis machine and ability to make carbon sinker beforehand to verify tolerance of overall feature. In my current world @ 1" thick wire edm would be more economical and certainly fit the bill.
I like seeing parts like this for the mere fact it makes a person think, like the original poster of this did.
If you start thinking about what it is, and then think how would I make that it is the most crucial step in becoming a good designer. IMHO anyways.
Now if all you had were a mill and a lathe this part would be a fun conundrum to figure out for sure.
We have a different definition of fun.
It all depends on the "Unspecified Corner Radii" specification. Say it was .130 MAX. One could mill if from both sides.
What is the tolerance for three place decimals. Say it was .001. Back to WireEDM.
Aww for me fun was always taking on thing that were challenging, hence my enjoyment in my current field. As far as this part goes 1 look and milling is out that is why I said it would be a conundrum. I have seen many a times where parts are quoted that a shop has no capability of making yet they try because it is competitive out there.
Funny shape to confuse students.
David Nelson wrote: Funny shape to confuse students.
David Nelson wrote:
Retrieving data ...