Hey guys, I think it would be cool if somebody could make a list of all the machine shop procedures that they do on engines and write a definition for each. I think that would really help me and others! I've already done several searches and looked all over on the net but came up with nothing.

no idea where or how you looked for anything but i found more on thirdgen and google than i could ever read in a week.


edited, link not needed

No, I'm talking about a list of machine shop terms, like what they do to an engine when it get re-built. I just thought a list of all the different procedures would be helpful to a lot of people.

Do you mean terms such as:

Bore;

Hone;

Deck;

Align Bore;

Sleeve;

Hot Tank;

Induction Harden;

Mill;

Surface grind;

Polish;

Flute;

Ream;

Lap;

Normalize/Stress Relieve;

Extrude Hone;

And things like that?

Exactly, now we just need some definitions.

Bore: enlarging the cylinder

Hone: using a semi-smooth stone to put a cross-hatch pattern on the cylinder wall, allowing the rings to seat better.

Deck: cutting the top edge of the block down (where the heads mount), giving you less cubic area and higher compression.

Align Bore: a long boring bar is run through the main bearing journal mounting area to ensure the crankshaft will spin straight.

Sleeve: used when a cylinder cannot be bored any larger. Basically a new cylinder wall is pushed into the block.

Hot Tank: dip tank used to clean the block of all gunk and goo. Usually eats the cam bearings, so make sure to replace them.

Polish: make a surface smooth. A smoother surface has less friction and resistance.

Normalize/Stress Relieve: to me, this means to remove any sharp corners. Sharp corners are weaker than more gradual, rounded ones.

Not sure about the rest, or even if the first ones are correct.

Induction Harden;

Mill;

Surface grind;

Flute;

Ream;

Lap;

Extrude Hone;

How many did I get right?

Mill is to cut the surface down. Used many times on heads to reduce the cc of the head. It's placed on a mill hence the name.

Extrude hone is when an abrasive is pushed through an item until the abrasive eats away at the inside. Bascially porting it, even what you can't reach with a die grinder and usually doing it very evenly. Also very expensive.

Surface grind is just that...

Ream is to remove a ridge of, say, the top of a cylinder

I don't know what Flute means, other than "this one time, at band camp....." :sillylol:

Lap means to lap the valves. Even though they may have just done a valve job, they have to remove all the slight imperfections that may cause a leak. They do this by putting "lapping compound" on valve, then slowly turn it against the face of the seat.

Thanks guys.

damn i gave you a link and you couldn't take the time to read it? it had just about any and all automotive terms and definations you'd ever thought of.

Ed! It's a lot of work pushing that big, heavy mouse all the way over to that highlighted link, then having to push the mouse button, too? I mean - c'mon...

By the way, I forgot

"Radius", "Chamfer", and "Fillet".

Umm, I did look actually but I was finding automotive terms in general, not engine building procedures. Why don't YOU take the time to look over there. Thanks anyways guys.

Forget about "torque plate" and "turning the crank"?

i did it had ALL automotive terms machining included

O.K. then, too bad you edited it.

I did look at the link, and a couple of the pages of alphabetized groups, and didn't find many of the common machining terms I expected to see. That's why I started a list...

actually i stopped at alighn hone, i figured if it had one it had another

Well thank you vader, thanks all for the definitions.

Induction Harden; is the process of using a massive amount of current to harden an object, the heat generated will harden it also the current flow causes a grain structure to lineate or line up molecularly somewhat. The frequency used and time of cycle will decide the depth of the hardening process. it is regularly used on axles, input, and output shafts and can sometimes be combined with some chemical hardening processes. To a laymen like myself the process basically makes the item glow like a under powered light bulb element.

Normalize/Stress Relieve;

I have heard of a "Normalize/Stress Relieve" process called "metalax" but I am unfamilair with this proceedure. I am aware of a proceedure which uses crygenec cooling to lower the temperature of an item to the absolute lowest achievable molecule vibration (which is what temperature is) to allow a "settling" of the molecules into gaps and such the process is expensive but I guess it does wonders but sometimes can result in a change in critical dimension.