Quote (lo0lo0lo0l @ Dec 1 2012 03:53am)
http://i46.tinypic.com/2zhgqgz.png
How do I go about starting this? How thick is the extrusion part of most of the part? I also don't know what the REAM is referring to?
http://i47.tinypic.com/2qtbwut.png
Further explain - it is very important that I get a 97 at least on this lol, i didnt realize how online classes worked the first week and got 6 0s for quiz grades cause i didnt even know i had them :[ now its coming back to haunt me. i just really really dont want to over look anything.
Basically on this part you are going to create the two profiles (the "h" shape and the "L" shape and then resolve it around the center axis, in this case 45 degrees for the "h" shape and 90 degrees for the "L" shape.
Reaming is used to cut holes with a high tolerance. Generally it will be used when surface finish is an issue. It appears the drawing is saying to use a reamer to get the ID of that part to 53.965+/-.015. That being said, I would be surprised if you would ream all the way through that ID. Generally you are going to use a regular drill and undercut and then go back through with a reamer and clean it up.
"9 drill 2 holes 9 deep" means use your size 9 drill and cut 9 deep where it says and then also at the hole 180 degrees rotated (the one on the bottom).
I don't know if this is your teacher's intention, but when I see a general statement like "fillets r3" and it doesn't point to anything, I interpret that as a universal rule. Basically all sharp edges on the drawing need to have a 3 fillet (no idea if this is in mm or m or what). Again, I don't know if that is what your teacher wants. This drawing is horribly done and I don't know what is going through his/her head when he/she makes it.
The r6 at the top left just tells u to put a 6 radius on the corners of those extruded parts obviously.
Yes, that "thickness" will be 9.5. It is just (44-25)/2, which you appear to have gotten. As for the thickness of the parts on the resolved areas, it is simple arithmetic. For example, the thickness of the tall part of the "h" would be (73-53.965)/2 = 9.5175. Assuming they want whole number tolerances, that would be 9.5 thickness as well.