Convert Degrees to Foot Pounds?

Gunner Asch on Tue, 10 Oct 2017 21:38:19 -0700 typed in rec.crafts.metalworking the following:

Can you still get those?

I used to have a catalogue.

-- pyotr filipivich "With Age comes Wisdom. Although far too often, Age travels alone."

replying to Kenn E. Thompson, RR wrote: I notice that every one has an obvious answer to the mans question. However there may be other reasons to want to know what the equivalent to a 90 degree turn is. For example what if you are not sure (because of some interruption), if you missed a step ( a bolt) in the sequence. How would you go back and check the tension (torque) on the bolt. Is there some one who can tell how to double check the torque on each bolt. Something the engineers did not anticipate in the calling out turns instead of torque.

replying to Kenn E. Thompson, RR wrote: I notice that every one has an obvious answer to the mans question. However there may be other reasons to want to know what the equivalent to a 90 degree turn is. For example what if you are not sure (because of some interruption), if you missed a step ( a bolt) in the sequence. How would you go back and check the tension (torque) on the bolt. Is there some one who can tell how to double check the torque on each bolt. Something the engineers did not anticipate in the calling out turns instead of torque.

I'll state what should be the final on this matter: YOU CAN RE-USE THE BOLTS. Forget all the theory crap above mmmk. I own the repair manual. You just need to check them to see if they are still in spec. If they are reuse them if they aren't get new ones. Period.

Let's follow up in about 16 years, just to make sure.

If these are torque to yield bolts they cannot be re-used. How do you check them to see if they are still in spec? How do you measure the yield point by just looking at it? hummm? Several years ago a company here was chipping tires and the cutters were shattering. They asked for my opinion of why. These were 1" fine thread gr8 bolts and they were snapping off. Did you torque them to spec.? Yes. Were they new bolts? No, they cost too much to replace. I said: you have to use new bolts as you are torquing them beyond the new yield point and that's why they are snapping off. The point at which they are breaking off has been work hardened and cannot be streched again. The owner told me to get the f...k out of here. They contined to use the old bolts and are now out of business. The shredding machine got scrapped due to damage. About those Deutz bolts, the torque to 30 ft lbs snugs up the threads and turning it 45 degrees stretches the bolt a known amount. Torquing it may over stretch it beyond the yield point. Those Deutz engineers apparently understand this. Kudos to them.. ;>) pdk

Some can be re-used, the Rover K series engine bolts are one. The factory specified they can be re-used if they are still within a particular length. Maybe in that case their length allows it to be done safely as the bolts pass all the way through the engine from cylinder head to the bed plate.

The torque then add degrees is actually MORE ACCURATE than a simple torque because you are STRETCHING the bolt. Can you get away without replacing the bolts? Sometimes you get lucky - sometimes lucky gets you (bites you in the ass) When you say in spec, do you mean check for stretch with a micrometer??? On a 6 inch bolt with a bit of rust or crud you trust yourself to measure within 10 thou or less??? Good luck. ANd an UNDER-TORQUED head bolt is more likely to break than an overtorqued one on those engines due to heat cycling fatiguing the unstretched bolt. 45 degrees in 1/8 turn - VERY easy to get THAT right.

When you are doing a $10,000 rebuild don't risk the whole job an a dozen head bolts - REPLACE THE DAMNED THINGS!!!! (Turning wrenches since 1969)

No they don't there a bunch of educated dumbasses if they had to work on these cars one day they'd change a whole lot of things like this 08 chevy van the heads torque to 22 ft lbs the 90 degrees then 70 degrees what kind of bulls__t is thst

Quite simple, the nut/bolt is tightened until the head/nut if tight against the head and then it is turned X degrees which stretches the bolt to it's designed clamping force.

16 years after this post, it's still teaching old dogs new tricks. Thanks, Leo, wherever you are!

- > "Tim Williams" wrote: 3 * 4 = 4 * 3. ;^)

replying to Ken Davey, Stephen wrote: What is 90 degrees in foot pound

replying to Ken Davey, Stephen wrote: What is 90 degrees in foot pound

replying to Kenn E. Thompson, RENE wrote: what's the 90 degree to foot pound. Conversion please

replying to Kenn E. Thompson, RENE wrote: what's the 90 degree to foot pound. Conversion please