Thats still a very general question/I use different cross hatch /load /and dwell settings for different ring materials /different radial tension/different fuel /etc etc.Its a live ,try and see what works for you.The underlayment process is very important in some rings .You need to get with someone competant in the brand of rings you use./Say total seal /They will tell you what can work and you make small changes from that.
Not the answer you wanted but that trade secret on what works for a guy will not be overly discussed freely.

 

Yes i have been working with keith @ total seal, along with using a profilometer too, but i would like to know the formula for figuring out the angles for a given cylinder length and diameter......

JUST cause I want to know........

A simp[le formula will do.........

What i have been doing works but just simply want to know

for if i want to change my angle 2* i can.......thats all

SOMEONE HAS to know of a formula......

 

Try giving Sunnen a call they might be able to assist you.

 

Sunnen, should have that for you. But, a simple formula probably wouldn't work well because of the varying materials, loads and direction changes...and a few other things.

Something that might work is to take Pi * Diameter and get the in/s the stone moves around the cylinder. Match that with the in/s down and up in your z-axis that your stones move. Then, write down the resulting angle you get with each combination of rpm & feed. Shouldn't take too long to figure out what combinations gives you the angle you want based on cylinder material, stone loads, honing oil...etc. Just keep a record. :smt102

 

Oh, and IIRC, the difference in hone angle between the B/D and C/E setup was in fact 2 degrees. (referenced off the deck)

 

Rottler has a cross hatch angle program that is really easy to use, we have a hp6a diamond hone. Not sure if rottler has a download, I will find out how we got it.

 

A Rottler 6A diamond hone will give you a better finish with as much as 10% better seal.

 

10% is a very big number....

 

10% of what?

I guess the gains are dependant on where you started from!

 

Example A. = 27 degrees. B= Diameter 4.00 c= rpm 195 d = length 4.00 the target of a is .2400 step 1 .2400 x 4.00 x 195 = 187.2 step 2 .6366 x 4.00 = 2.5464 step 3 187.2 / 2.5464 = 73.5 strokes per minute tangent for angles are. .1943 for 22 ,.2035 23 , .2125 24 , .2216 25 , .2308 26 , .2400 27 , .2493 28 , .2586 29 .2679 30 as from rottler

 

RCM,
This is from Sunnen; Tangent (A/2) = {(L-F)xS} / (DxR)

A=included crosshatch angle in the middle of the bore
L=length of bore
F=stone length
S=strokes/minute
R=rpm

 

well,
are we all in agreement that most want from about 30 degrees to not less than 27 ...or what..

I have also thought about this ..

are you saying that the ring guy has a spec on the angle...???

using the paper in the bore trick and then running yer finger pressure up and down to inprint the cross hatch
has been done for years and years....I learned it from a old BIKE engine guy when he did all the cylinders with a hand held rigid hone.

 

I think that you are just going to have to try different pulleys and stroke length and use the paper trick and a protractor and see what you get.
as has been posted,. as the diameter changes the angle changes too...

 

I came across this thread from Google as I was looking for a formula to calculate a specific cross hatch angle. I eventually found the formula, but thought it would be easier if there was an online crosshatch angle calculation to plug the numbers in and get a result. I hope this can help someone else out whose looking for an easier way to calculate a crosshatch angle without using a complex formula. http://www.crosshatchangle.com

 

First post from a necromancer!

 

Where in the bore is crosshatch angle measured? Middle of the stroke?

 

You can measure it anywhere in the bore. It should be consistent the length of the bore.

 

Does the rotation speed slow down as the stoke slows down and changes direction at the top and bottom?

If not, i dont see how crosshatch angle can be consistant.