BTW Project... do you have any contact information?

-Mindgame

 

Parts drawings....machine draftings.....cmm or a universal measure machine, I don't see where you get off assuming cause i'm using a different lingo that it's some kind of wet dream of mine to pretend that i'm trying to out due a "non-engineer" instructor. The assumptions you some of you guys make, I have to sit back and laugh sometime. If I didn't know what I was doing or what I was trying to get into, I don't think I would have asked the question. I'm jumping from copying throttle bodies to full out projects that I have been contemplating and building up as I have advanced through my degrees. I did not ask for the boost in confidence, just a little nudge in the right direction considering I know how hard it is to get draftings from anyone.

Project, can you pm me an email or number of someone that I can get ahold of to talk about getting a set of machine draftings. Thanks!

 

I didnt take down the guys contact info but the party I was with I belive did. Let me make a few phone calls today and see if they still have the info.

 

What do you smoke/drink? (at least the legal stuff.)

Yes, it's about how the burrs lay. Shouldn't you also polish a crank the same way?

The shaft in question spun in an oil seal which kept trans oil in the engine. Seal life was important, so the direction of the "lay" was important.

 

When i was in college i took several drafting classes as well as several machine classes and no one ever used the terms "machine draftings or universal measure machine". We used "blueprints, draftings, prints, and Cmm."
if your serious about getting into this buisness I would sujest using the proper terms and lables of things. becuse not using them could confuse some people or make you look just plain dumb. If you were to ask me what a universal measure machine was then i might say its a ruler or tape measure. even tho i new what you were talking about. Then i would correct you and tell you to go back to school. But enough of that im not here to flame.

If you think that you can design a set of heads from scratch and actualy have them perform then you have another thing comming. It takes years of r&d to even come up with the blueprints muchless all of the machine work involved. but good luck and i do hope you meet your goal.





oh yea btw talking to members on this board like that isnt going to get you anywhere. You ask for help then get mean or cocky in a post and then ask for help again. You are the one who assumed that we already knew your whole story. With your first post we have no idea what your background is so its left up to us to speculate.


oldss
i rember one of the teachers telling me about that in class a few years back. he had microscopic photos of a shaft for something and you could see the burs.

 

Grinding is a material removal process much like single point turning, except the cutting tools are the individual grains in the grinding wheel. Each grain that cuts makes a VERY tiny chip, so there is direction to the cut.

Grinding hard steel lika a piston pin can quite easily give an average surface roughness of Ra 5 or less. In order to Diamond Like Carbon (Casidiam) coat the pin the surface finish needs to be Ra 0.5 or less. Getting there is a challenge. The DLC is so hard that if you coat a "rough" surface (Ra 1.0+) you effectively make a diamond file out of the part.

 

I dont have access to the guy anymore. But I spoke to a friend and I was told that if you are a member of SEMA then you should have no trouble getting that contact info thru SEMA. Any of you guys a SEMA member? Try researching it thru them. I wish I could do more, or paid more attention to the guy we were talking to at the show. Actually I just wish I grabbed his card... But I was standing next to him when he said that GM is offering up this type of info so companies dont have to reverse engineer new products. They actually want the aftermarket stuff to work.

Sorry guys, I wish I could be of more help.

 

Several years ago, a friend of mine who works for a private engineering firm, showed me a LS1 corvette head which they had reverse engineered for a customer. They had a machine which scanned it with a laser, outputted the 3-D coordinates to the work station, and created a near exact solid model in Pro-E with about a million measurement/data points to approximate the part. This is how it is done if you have the money for the equipment. Of course, the problem of figuring out the tolerances is a big job as was previously mentioned.

 

OS,

I'll be at the next PRI. Let's square this one away there shall we?

Bring a couple of Cohibas and some Lagavulin.

As for polishing, I'm thinking that it's performed in the opposite direction to reduce the size of the "burrs" & provides a better surface finish. No personal experience mind you... just what I remember reading.

FWIW, I don't recall where I read this article but believe it was in a "machine design" magazine or something of that sort. I'll try to dig it up.

-Mindgame

 

I'll pass on the seegars, but Lagavulin 16 is one of my favorite Islay singles. I like it with a good Columbian coffee in the late evening. Have you tried Caol Ila 12? It's not as intense, but for about $20 less it's a pretty good Islay.

No mater which way a shaft or crank journal was ground, polish it so the "burrs" lay in the direction of rotation. It takes some powerful magnification to determine grinding direction if the finish is Ra 8 or so.

I have some very finicky customers for the custom bearing rollers we produce, but I've not heard any of them say they check grinding direction on rollers when assembling bearings. Practically it only works to specify grind direction if the shaft has different ends so it is always assembled the same way like a cam or crank.

OK, so do engine builders who build reverse rotation engines really polish cranks in the reverse direction?

 

Yes sir, Caol Ila is a fine one... also one of my favorites. I always keep a bottle around for special occasions.

You a fan of Laphroaig at all? Very intense... definitely an acquired taste but not something I really care for.

Thanks for the thoughts on polish direction OS. This stuff has always intrigued me even though I am not in the manufacturing trades. Not on the shop floor side of the coin anyways. Just like knowing how and why things work.

You got me on the last one.

-Mindgame

 

You could say that.... that 10 year old stuff makes my noise hairs curl when the old man brings it out. At least the 15 at least SMELLS drinkable, not akin to terpintine.

I'll let you guys stick with the Scotch, I'll stick to a very, very dry vodka or gin martini, i'm probably as picky as you too are on scotch on what gin or vodka it is.

FWIW, screw PRI we can't see your toys at PRI. ;-)

Bret

 

Bret's take on Laphroaig 10 and 15 was what I'd say.

Bourbons are another favorite of mine. Just tried a Blanton's single barrel.

Bret would probably reverse polish a new crank.