What is the difference between boring and honing

The two operations are widely used in engine block finishing. Related Posts. Define Boring and Honing Machine. Unknown Pada 2 Komentar. Subscribe via email Like the post above? Please subscribe to the latest posts directly via email. Chirag Reddy. Newer Post Older Post Home. Subscribe to: Post Comments Atom.

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Drilling has the following technological characteristics: 1. The drill bit is easily deflected. The aperture is easy to expand. The surface quality of the holes is poor. Large axial force during drilling. Reaming Reaming is a cutting process that involves using a rotating cutting tool to create a smooth inner wall in an existing hole in a workpiece.

Boring Boring is a cutting process that involves the use of a single-point cutting tool or boring head to enlarge an existing hole in a workpiece. Process characteristics of boring 1 The adaptability of boring is strong.

In mass production, boring the bearing holes of the bracket and box body requires a boring die. The roundness and cylindricity errors of the hole can be controlled, but honing cannot improve the position accuracy of the hole being machined. High surface quality can be obtained by honing, the surface roughness Ra is 0.

Or sign in with one of these services. Well, I'm kicking myself sideways,backways and upways right now. I found out in the manual that your supposed to hone the cylinder before re ringing the piston.

So I gotta do that. But what's the difference between boring the cylinder and honing it? Some people say boring it makes the cylinder bigger etc. And some say honing does that. What do y'all think? Im not sure the cylinder is cast iron though. But it talks about honing it in the manual, so i assume so. Boring is rough cutting the cylinder to a larger size. Honing is removing the rough cuts to make the cylinder walls almost perfectly smooth. A few scratches not gouges are left to allow a place for oil to reside to lubricate the piston rings.

Thanks Dan B. What kind of hone do you recommend? I've seen some that are expandable and use stones. I would concur with all that's been mentioned above, but to also add, honing is also used to get rid of metal transfer residue. This happens with aluminum pistons. Usually it's a big problem for chainsaws, and such. Never heard of it being a problem on bigger engines. So honing in your case is probably optional.

It's definitely recommended, but I wouldn't think there'd be much difference. If the motor is still out of the chassis, I'd take it apart, because I know myself too well.

My OCD wouldn't let me just forget about it. As far as which hone to get, the one with the stones give a nice cross hatch pattern, which is what most people want.

I didn't look at any of the others that you linked. But most of the rest will polish the cylinder. Polishing a cylinder is useful for 2 cycle engines, but certainly won't hurt yours.

After all, that's what the rings are going to start doing immediately after starting it up. My recommendation would be to get the machine shop up the street to do that as well.

Since a cylinder hone is not something you'll ever use much, why buy one? Honing used to be dirt cheap, probably still is. This will also allow you to ask these guys any questions that you might still have. Disassembling, and assembly will go much quicker,and be much easier this time around.

It'll also give you a chance to check your previous work. I'd say to just wade on in. Think of it this way; if you don't, and you can't seem to get it running right. The profilometer drags a tiny diamond-tipped stylus across the surface to calculate a number of important parameters. Many piston ring manufacturers specify a surface finish of 15 to 20 Ra for moly faced rings, which can be achieved by finish honing with grit stones.

Cast iron and chrome rings can tolerate a somewhat rougher surface finish 20 to 35 Ra so coarser grit stones can be used to produce this type of finish. Plateau finishing the cylinders with grit stones, or a plateau honing tool or brush will improve the finish and lower the numbers to the desired range of 20 or less. If Rmax or Rz is more than 12 times the Ra number, the surface has too many deep scratches.

Some performance engine builders run somewhat higher Rvk valley depth numbers in the crosshatch to improve oil retention in high revving engines. According to one ring manufacturer, the recommended surface numbers for a performance engine with a hard block or cylinders like a typical ProStock or NASCAR motor are:. The recommended numbers for other types of racing such as sprint cars and drag cars would be a little rougher:. What about crosshatch? Recomm-endations also vary according to the application.

The typical automotive application calls for a 42 to 45 degree included angle crosshatch, while 20 to 30 degrees is often recommended for performance engines. If the engine has a Nickasil coating, even less cross hatch is needed, typically 10 to 15 degrees. Features: Justina Reusch, Reusch Diesel. Magazine Current Issue Past Issues. Connect with us. Advertise Subscribe Contact Us.

ICE vs. By Larry Carley. Good Bore Geometry The second major goal of boring and honing is to achieve the best possible bore geometry. Achieving Proper Geometry To achieve the best possible bore geometry, late model engines with thinwall castings and performance blocks should always be honed with a heavy steel torque plate deck plate and head gasket bolted to the block.

Surface Finish Tips Surface finish recommendations for late model engines vary depending on the application, but are often in the 15 to 20 microinch range Ra roughness average. In this article:. Watch Engine Builder's latest discussions and explanations. Shop the latest Engine Builder merchandise.