Which way does a plane blade go?

Also question is, are block planes Bevel Up?

Even so, a block plane's cutting edge meets the wood at about the same angle as a bench plane's. That's because the bevel on the block plane's iron faces up. (For a block plane, the angle of the cutting edge to the work equals the bedding angle plus the iron's bevel angle.)

One may also ask, what does bevel down mean? Here's why: In a bevel-down plane, the blade (along with a chipbreaker, which attaches to it) rests on a frog—typically, a 45° bed screwed to the plane body. Because the bevel is behind the edge, the cutting angle is fixed at 45°. That's a good angle for most tasks, but not for end grain or grain prone to tearout.

Moreover, why does needle bevel need to be up?

bevel up when inserting IV catheters. I have always inserted peripheral IV catheters bevel up because entering with the bevel up allows the sharp tip to pierce the skin first, paving the way for the rest of the needle. I noticed that entering the vein with the bevel down causes painful tearing of the skin.

What is the difference between a jack plane and a smoothing plane?

The plane size and shape also effects function. Short bench planes like a smoothing plane are good for smoothing the wood to create a glassy, finish-ready surface. Jack planes are slightly larger. They're used in the early milling stages to remove the hills and valleys on the surface of a board.