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Tbuttrick,
I'll add that the thread diameter on the F1 car in your picture appears much smaller in diameter than the usual Cobra setup, so it would need less torque than a Cobra, but even so, with a 3 foot wrench, it is not that hard to produce a bunch of torque with a 'yank' from a single arm. Still would be less than a large diameter Cobra knock-off would need... As far as the Olthoff video, two things to consider. The amount of force a hammer produces, when swung and then stopped in a short distance is huge. I could go into the equations of kinetic energy (KE = 1/2 x mass x velocity squared) being converted into force as it is decellerated (KE = Force x distance), but a quick inspection of the equations should convince you that when the distance gets small, the force gets very large. Further, during an impact shock, the friction (which drives the .2 constant in the torque equations above) is instantaneously reduced to a very low value. This means that a small 'constant' torque will tighten a festener adequately, if it is accompanied by a impact shock. These two things make the hammer method decieving in terms of thinking about an equivalent applied wrench torque and lead you to think a small wrench torque will achieve the same result. |
Tbuttrick,
You may want to brush up on your Engineering. You, however are right that a 10 foot diameter wheel would need a larger knock-off than a normal wheel (but the effect is linear and not exponential). It would also have to apply way more clamp force. This is why knock- offs are not typically used on giant dump trucks, they require way more torque and clamping force. Look at how many studs giant dump trucks use. Neither this nor the two-by-four example have anything to do with applied fastener torque producing preload. All you are saying is that a bigger wheel needs a bigger bolt - true, but it will also need more torque applied to produce enough preload. You may not be a physicist, but you are not an Engineer either. This stuff is Engineering 101 and there is really no magic here. Believe me or not, but if you put 70 ft-lb on your knock-offs, you will not like the result. You have been warned. |
um, sorry but I are an Engineer. I even have my own choo-choo train and thanks for the warning. Now that you've shown us how big your giggle stick is, I'm a degreed EE so even though this type of ME application may be a bit foreign to me, I'm still calling BS on your theory and whether or not it applies here. Short strokes with a lead hammer holding the handle close to the head as depicted in Dennis' video, will NOT produce the kind of force needed to achieve 350ft/lbs. of torque with the thread pitch we're assuming is common on hubs. Tell me I'm wrong. It defies logic.
Normal people believe that if it ain’t broke, don’t fix it. Engineers believe that if it ain’t broke, it doesn’t have enough features yet. |
Tbuttrick,
You're wrong. |
OK. You win.. U-N-C-L-E Gosh, I gotta get some self esteem.
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Interesting. I've never seen engineers comparing wee-wees before............. :LOL:
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The guy with the large socket......
Had the best idea! It works, and if you go slow you wont hurt anything.
When I bought my gt40 the guy must have hammered the sh-t out of the spinners and didnt use enough anti-seize. I tried for HOURS hammering in the right direction and could NOT get them loose. I bought a big truck socket, cut the notches in it, lined the cuts with split fuel line (to protect the finish in the spinners), attatched a 3ft breaker bar with a 4 foot extension, and broke them loose!!! After that experience I had 3inch lug nuts made up to replace the spinners, and use a 1inch truck impact to install and remove. No muss no fuss! Screw those spinners, never again!! Scott |
spinner tool
2 Attachment(s)
Well I must admit I did not think I would ever use my spinner tool.
The other day I used it to help a tight spinner nut, after a good clean of both nut and hub I coated the hub threads with anti seize and used the spinner tool to help the nut on and off now it goes on by hand. Must say it worked well. |
Tork striker .com
spinn-r-tool .com |
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All you needis the American hammer lead hammer
After removing them for the first time use anti seize on the threads and mating surface of the spinner to wheel and you won't have any problems again There is a. Good video about removal but more importantly install that will tell you when they are right enough so you don't over tighten |
Vintage Wheels spinner tool
Hi Folks
We will soon launch our own version of a spinner remover /install tool - pictures and prices soon !! Features will include dog ears to prevent tool slipping off , ACH Polymer inserts to prevent spinner damage and it can be used with hub spindle end caps in place. More details to follow Bob Lacey Vintage Wheels 1 888 339 7572 Vintage Wheels, Hot Rod and Muscle car |
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