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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Cutting a 30 gallon steel drum
On Thu, 18 Nov 2004 12:57:55 +0800, Old Nick
wrote: On Tue, 16 Nov 2004 23:35:40 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email You serious? Chicago Pneumatic are crap? Hey Nick, I think Chicago Pneumatic (**CP** brand ) are excellent. But you have to be careful now-a-days about "brands". I see that there are many air tools sold that have the brand Chicago Power (sound like--sort of) or something similar, and they are POOR clones of the original CP stuff. Just trading on the "a little knowledge" trait of some buyers!! Take care. Brian Lawson, Bothwell, Ontario |
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On Wed, 17 Nov 2004 23:02:58 -0800, Winston wrote: My Chicago Pneumatic impact wrench was completely defeated by auto lug nuts. It would make all the right noises, but even when it was turned up 'all the way', it couldn't break loose the least of them. I would sigh heavily and break the nuts loose with a moderate sized breaker bar. Finally tossed the thing. YMMV --Winston XXXXXXXXXXXXX Hey Winston, Wish you had tossed it my way. They are good tools. Must have been a problem with it. Take care. Brian Lawson, Bothwell, Ontario. |
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On Fri, 19 Nov 2004 17:27:25 +0800, Old Nick
wrote: On Fri, 19 Nov 2004 00:06:08 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email Gunner wrote: (Snip Winston whining about cheap air impact wrench) My rebuilt Ingersoll Rand 1/2" is often defeated by lug nuts. OK. What ft/lb rating is the IR one, Gunner? No idea. But Ill check this weekend. Gunner Dogs are better than people. People are better than dogs for only one purpose. And then it's only half of ofthe people. And _then_ most of them are only ordinary anyway. And then they have a headache......... "If I'm going to reach out to the the Democrats then I need a third hand.There's no way I'm letting go of my wallet or my gun while they're around." "Democrat. In the dictionary it's right after demobilize and right before demode` (out of fashion). -Buddy Jordan 2001 |
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On Fri, 19 Nov 2004 07:11:13 GMT, Gunner
wrote: On Wed, 17 Nov 2004 15:11:12 -0600, "Tim Williams" wrote: "Gunner" wrote in message news Gonna fill it with sand and set the anvil on top of the sand? Marvelous idea actually. Very good! Works wonderfully for my 7" length of rail road set on a 5-gallon pail of sand. I just wish railroads were thicker, wider and heavier... Tim I was given some rail a while back that is about 1/3 bigger in all dimensions than normal rail. I put it on my welding table. No idea of what it came from. Gunner About a month ago my wife was surfing her horse sites and found a beautiful little foxtrotter filly that would grow to about 14.2 hands. Perfect she thought to pull her cart. "Why dont you just train one of our horses to the cart?" I ask. "Ours are too big, we need a small horse to fit it, besides the wheels are too close together to be stable with a large horse." So I did some surfing of my own, thinking I would just make our shafts fit our gelding and extend the wheels out some. While searching for standard measurements, I ran across this possible myth (on some other site though) : http://www.truthorfiction.com/rumors/r/railwidth.htm I live in a very rural setting, off the grid, but near tracks. The RR has kindly provided me with lots of useful "scrap". |
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Brian Lawson wrote:
On Wed, 17 Nov 2004 23:02:58 -0800, Winston wrote: My Chicago Pneumatic impact wrench was completely defeated by auto lug nuts. It would make all the right noises, but even when it was turned up 'all the way', it couldn't break loose the least of them. I would sigh heavily and break the nuts loose with a moderate sized breaker bar. Finally tossed the thing. YMMV --Winston XXXXXXXXXXXXX Hey Winston, Wish you had tossed it my way. They are good tools. Must have been a problem with it. Take care. Brian Lawson, Bothwell, Ontario. You would have been welcome to it, Brian. I expect it could have been used for other stuff but I only had one reason to own the thing. And it couldn't do that. --Winston |
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Old Nick wrote:
On Fri, 19 Nov 2004 00:06:08 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email Gunner wrote: (Snip Winston whining about cheap air impact wrench) My rebuilt Ingersoll Rand 1/2" is often defeated by lug nuts. That is wierd. The guys installing wheels can get the nuts tight enough to require a breaker bar *and* cheater. They must be using an uber wrench. Well I am regularly seeing 500lb and even 1000lb ones for sale in the papers, but they're 3/4 drive. Maybe 350 is just not enough. 350 is probably *plenty*, if they are real pounds instead of Sears pounds. 350 ft. lbs would spin off lug nuts easily. Back of envelope arithmetic: Distance from center of spindle to end of handgrip ~0.7 ft. (350 ft. lb. of torque) / 0.7' = 500 lbs. of force to counteract. The wrench I owned wasn't supplying that kind of force to my hands even on a good day. More like 20 lbs. of force to counteract. On a good day. So, no more than ~14 ft. lbs. of torque at the spindle. Heck, the torque spec on my lug nuts is more like 70 ft. lbs. No wonder it didn't work. As Brian said, my wrench was probably a cheap knockoff of the real Chicago Pneumatic brand. I got that for which I paid, unfortunately. --Winston |
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Brian Lawson wrote:
On Wed, 17 Nov 2004 23:02:58 -0800, Winston wrote: My Chicago Pneumatic impact wrench was completely defeated by auto lug nuts. It would make all the right noises, but even when it was turned up 'all the way', it couldn't break loose the least of them. I would sigh heavily and break the nuts loose with a moderate sized breaker bar. Finally tossed the thing. YMMV --Winston XXXXXXXXXXXXX Hey Winston, Wish you had tossed it my way. They are good tools. Must have been a problem with it. You are probably right, Brian. It wasn't priced like a quality tool, so it probably was a 'knockoff'. Lesson learned. --Winston |
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On Fri, 19 Nov 2004 10:41:48 -0800, Winston
vaguely proposed a theory .......and in reply I say!: remove ns from my header address to reply via email I am not sure we are seeing Sear's ftlbs. initially, I felt the same as your thoughts that the 350ftlbs at the wrench would translate to 500 lbs of force at the handle. But if this followed, then no imnpact wrench worth crap would be _usable_, because it would simply rip out of your hand. I think there must be an impact level of 350 ft lbs. So measuring this is going to be extremnely difficult, using expected torques on the handle. It will be for a very short time. AFAIK, mine is NOT a cheap knockoff. Given that I see 100ftlb machines for sale, I simply wonder if 350ft lbs is simply yhe baby of the lot, and not very heavy duty. 350 is probably *plenty*, if they are real pounds instead of Sears pounds. 350 ft. lbs would spin off lug nuts easily. Back of envelope arithmetic: Distance from center of spindle to end of handgrip ~0.7 ft. (350 ft. lb. of torque) / 0.7' = 500 lbs. of force to counteract. The wrench I owned wasn't supplying that kind of force to my hands even on a good day. More like 20 lbs. of force to counteract. On a good day. So, no more than ~14 ft. lbs. of torque at the spindle. Heck, the torque spec on my lug nuts is more like 70 ft. lbs. No wonder it didn't work. As Brian said, my wrench was probably a cheap knockoff of the real Chicago Pneumatic brand. I got that for which I paid, unfortunately. --Winston ************************************************** *** Dogs are better than people. People are better than dogs for only one purpose. And then it's only half of ofthe people. And _then_ most of them are only ordinary anyway. And then they have a headache......... |
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Old Nick wrote:
On Fri, 19 Nov 2004 10:41:48 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email I am not sure we are seeing Sear's ftlbs. initially, I felt the same as your thoughts that the 350ftlbs at the wrench would translate to 500 lbs of force at the handle. But if this followed, then no imnpact wrench worth crap would be _usable_, because it would simply rip out of your hand. They do have a torque adjusting valve. I think there must be an impact level of 350 ft lbs. So measuring this is going to be extremnely difficult, using expected torques on the handle. It will be for a very short time. Yeahhhh. But. If the torque even *peaked* at 350 ft. lbs. the wrench would still have no problem with a ~70 ft. lb. lug nut. Sears ft. lbs., I insist. AFAIK, mine is NOT a cheap knockoff. Given that I see 100ftlb machines for sale, I simply wonder if 350ft lbs is simply yhe baby of the lot, and not very heavy duty. My 1/2" Makita drill has *way* more torque than that 'impact wrench' ever did. --Winston |
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On Sat, 20 Nov 2004 07:59:28 +0800, Old Nick
wrote: On Fri, 19 Nov 2004 10:41:48 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email I am not sure we are seeing Sear's ftlbs. initially, I felt the same as your thoughts that the 350ftlbs at the wrench would translate to 500 lbs of force at the handle. But if this followed, then no imnpact wrench worth crap would be _usable_, because it would simply rip out of your hand. I think there must be an impact level of 350 ft lbs. So measuring this is going to be extremnely difficult, using expected torques on the handle. It will be for a very short time. AFAIK, mine is NOT a cheap knockoff. Given that I see 100ftlb machines for sale, I simply wonder if 350ft lbs is simply yhe baby of the lot, and not very heavy duty. I'd be willing to bet that everyone who's had problems with impact wrenches haven't read the instructions. The fact is 1/2" impact wrenches really need a 1/2" hose and large size quick connects to get enough air to make rated torque at rated pressure. If you want rated torque with a 1/4" or 3/8" hose then you'll have to run at higher pressure to make up for the pressure drop. Also not all impact wrenches are made for max torque. I have a old industrial grade Souix impact wrench. It's definitely not the strongest out there but it's very well made. It's designed for use on a production line without over tightening the bolts. In fact I've got a 3/8" IR "Ultra Duty" impact which comes very close to being as strong as my 1/2" Souix. It's really too strong and I was forced to buy a cheap Harbor Freight 3/8" impact to use for any bolts smaller than 7/16". There's no way to turn the IR down enough to use with smaller bolts without breaking them. Wayne Cook Shamrock, TX http://members.dslextreme.com/users/waynecook |
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On Sat, 20 Nov 2004 10:58:08 -0600, Wayne Cook
vaguely proposed a theory .......and in reply I say!: remove ns from my header address to reply via email I'd be willing to bet that everyone who's had problems with impact wrenches haven't read the instructions. The fact is 1/2" impact wrenches really need a 1/2" hose and large size quick connects to get enough air to make rated torque at rated pressure. If you want rated torque with a 1/4" or 3/8" hose then you'll have to run at higher pressure to make up for the pressure drop. Yes. I agree. And guilty as charged, although I kept my run as short as I could, and even tried running two 3/8 pipes in parallel (which I have since found to be a minimal gain). What you need is a gauge at the tool end, probably. Having since looked at fluid flow through pipes, I have been completely floored by the effect that pipe size has on flow capabilities. Going from 3/8 to 1/2 over a 20 foot length causes a about 4:1 reduction in flow restriction. This is the fifth power of the diameter ratio! When I was looking at this "off the top of my head", I assumed it may be the square of the diameter, maybe, "plus a bit". But friction on the walls causes more restriction than the actual area AFAICS! Also not all impact wrenches are made for max torque. Here I have more trouble agreeing. If it says 350lbft, then it should do 350lbft, whatever the usage it's then not suitable for. |
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Old Nick wrote:
(Snip) Here I have more trouble agreeing. If it says 350lbft, then it should do 350lbft, whatever the usage it's then not suitable for. RUHRA! ('Gabby Johnson', _Blazing Saddles_ 1974) --Winston |
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In article ,
Winston wrote: That is wierd. The guys installing wheels can get the nuts tight enough to require a breaker bar *and* cheater. They must be using an uber wrench. Well I am regularly seeing 500lb and even 1000lb ones for sale in the papers, but they're 3/4 drive. Maybe 350 is just not enough. 350 is probably *plenty*, if they are real pounds instead of Sears pounds. 350 ft. lbs would spin off lug nuts easily. Back of envelope arithmetic: Distance from center of spindle to end of handgrip ~0.7 ft. (350 ft. lb. of torque) / 0.7' = 500 lbs. of force to counteract. The wrench I owned wasn't supplying that kind of force to my hands even on a good day. More like 20 lbs. of force to counteract. On a good day. So, no more than ~14 ft. lbs. of torque at the spindle. Heck, the torque spec on my lug nuts is more like 70 ft. lbs. No wonder it didn't work. The ultimate strength of an impact depends on how fast the air motor can get that little weight swinging in one turn. Things that'll weaken a good impact: Skinny air lines or fittings Low or fluctuating air pressure Gummy oil buildup inside the motor Lots of grease inside the hammer compartment Weak grip on the gun--push against the handle's tendency to rotate and keep the jiggling to a minimum. Light weight guns are worse about this. Pull it apart, clean it up, check your connections and you can probably beef up most impact guns. The impact works by swinging around a weight and catching it on the side of a shaft once per revolution. If the shaft won't move, or only moves a little, the weight slips off and comes around again--whamwham. If the resistance is gone the weight holds onto the shaft and you get a direct drive--whrrr. So, that reaction force is actually whatever it takes to make that weight slip off the catch on the side of the shaft. The impact is the energy stored in the weight as it's accelerated around the shaft, and you get a small reaction force from that acceleration. I'm not sure how to go about calculating that, but what's up above isn't right. That's more like figuring for an air ratchet, which is a real knuckle buster. If you want I can pull apart my impact and provide some photos of its guts. As Brian said, my wrench was probably a cheap knockoff of the real Chicago Pneumatic brand. I got that for which I paid, unfortunately. --Winston Possibly, but you can sometimes get some use out of even a hunk of crap impact if you baby it. -- B.B. --I am not a goat! thegoat4 at airmail.net http://www.sorryeverybody.com/ |
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B.B. wrote:
(Snip) The ultimate strength of an impact depends on how fast the air motor can get that little weight swinging in one turn. Things that'll weaken a good impact: Skinny air lines or fittings Low or fluctuating air pressure Gummy oil buildup inside the motor Lots of grease inside the hammer compartment Weak grip on the gun--push against the handle's tendency to rotate and keep the jiggling to a minimum. Light weight guns are worse about this. Pull it apart, clean it up, check your connections and you can probably beef up most impact guns. The impact works by swinging around a weight and catching it on the side of a shaft once per revolution. If the shaft won't move, or only moves a little, the weight slips off and comes around again--whamwham. If the resistance is gone the weight holds onto the shaft and you get a direct drive--whrrr. So, that reaction force is actually whatever it takes to make that weight slip off the catch on the side of the shaft. The impact is the energy stored in the weight as it's accelerated around the shaft, and you get a small reaction force from that acceleration. I'm not sure how to go about calculating that, but what's up above isn't right. That's more like figuring for an air ratchet, which is a real knuckle buster. Thanks for the explanation. In the back of my mind, I expected that the specified torque was an instantanious value at the time of the weight impact. I just think that a wrench rated for 350 ft. lb. should have no problem busting loose a 70 ft. lb. lug nut, even if much of the force is suppled for a short pulse in each revolution. If you want I can pull apart my impact and provide some photos of its guts. Thanks for the offer but not for me. Perhaps Young Nick would find that useful? --Winston |
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In article ,
Winston wrote: [...] Thanks for the explanation. In the back of my mind, I expected that the specified torque was an instantanious value at the time of the weight impact. I just think that a wrench rated for 350 ft. lb. should have no problem busting loose a 70 ft. lb. lug nut, even if much of the force is suppled for a short pulse in each revolution. You're right, it *should* be able to. Either yours really is the piece of crap you think it is, or it needs a cleaning. If you want I can pull apart my impact and provide some photos of its guts. Thanks for the offer but not for me. Perhaps Young Nick would find that useful? I'll go ahead and do it for the hell of it. -- B.B. --I am not a goat! thegoat4 at airmail.net http://www.sorryeverybody.com/ |
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In article
, "B.B." u wrote: If you want I can pull apart my impact and provide some photos of its guts. Thanks for the offer but not for me. Perhaps Young Nick would find that useful? I'll go ahead and do it for the hell of it. Hooray for boring sundays mornings. http://web2.airmail.net/thegoat4/pro...gun/index.html -- B.B. --I am not a goat! thegoat4 at airmail.net http://www.sorryeverybody.com/ |
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B.B. wrote:
In article , "B.B." u wrote: (Snip) I'll go ahead and do it for the hell of it. Hooray for boring sundays mornings. http://web2.airmail.net/thegoat4/pro...gun/index.html Wow! Nicely done. Very nice clickable pictures. That impact mechanism surprised me with its simplicity. Thanks! --Winston |
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On Sat, 20 Nov 2004 18:31:26 -0800, Winston
vaguely proposed a theory .......and in reply I say!: remove ns from my header address to reply via email Old Nick wrote: (Snip) Here I have more trouble agreeing. If it says 350lbft, then it should do 350lbft, whatever the usage it's then not suitable for. RUHRA! ('Gabby Johnson', _Blazing Saddles_ 1974) Sorry...you lost me there.. |
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On Sun, 21 Nov 2004 07:52:03 -0600, "B.B."
u vaguely proposed a theory .......and in reply I say!: remove ns from my header address to reply via email You're right, it *should* be able to. Either yours really is the piece of crap you think it is, or it needs a cleaning. Or the lines were too small as Wayne said. IMO a far more likely common scenario. |
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On Mon, 22 Nov 2004 10:25:51 +0800, Old Nick
wrote: On Sat, 20 Nov 2004 18:31:26 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email Old Nick wrote: (Snip) Here I have more trouble agreeing. If it says 350lbft, then it should do 350lbft, whatever the usage it's then not suitable for. RUHRA! ('Gabby Johnson', _Blazing Saddles_ 1974) Sorry...you lost me there.. Its a Yank inside joke. G Gunner, giggling hysterically at the memory of the camp fire scene. "Candygram for Mr. Mongo!" Come shed a tear for Michael Moore- Though he smirked and lied like a two-bit whore George Bush has just won another four. Poor, sad little Michael Moore Diogenes |
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Old Nick wrote:
On Sat, 20 Nov 2004 18:31:26 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email Old Nick wrote: (Snip) Here I have more trouble agreeing. If it says 350lbft, then it should do 350lbft, whatever the usage it's then not suitable for. RUHRA! ('Gabby Johnson', _Blazing Saddles_ 1974) Sorry...you lost me there.. I was enthusiastically agreeing with your statement about truth- in-advertising. --Winston |
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Gunner wrote:
On Mon, 22 Nov 2004 10:25:51 +0800, Old Nick wrote: On Sat, 20 Nov 2004 18:31:26 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email Old Nick wrote: (Snip) Here I have more trouble agreeing. If it says 350lbft, then it should do 350lbft, whatever the usage it's then not suitable for. RUHRA! ('Gabby Johnson', _Blazing Saddles_ 1974) Sorry...you lost me there.. Its a Yank inside joke. G Gunner, giggling hysterically at the memory of the camp fire scene. "Candygram for Mr. Mongo!" "Work work work work work. Oh, hi fellas." --Winston |
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On Mon, 22 Nov 2004 04:02:29 GMT, Gunner
wrote: On Mon, 22 Nov 2004 10:25:51 +0800, Old Nick wrote: On Sat, 20 Nov 2004 18:31:26 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email Old Nick wrote: (Snip) Here I have more trouble agreeing. If it says 350lbft, then it should do 350lbft, whatever the usage it's then not suitable for. RUHRA! ('Gabby Johnson', _Blazing Saddles_ 1974) Sorry...you lost me there.. Its a Yank inside joke. G Gunner, giggling hysterically at the memory of the camp fire scene. "Candygram for Mr. Mongo!" "Mongo is just a pawn in game of life." "That's HEDLEY Lamar! HEDLEY, not Heddy!" And don't you just hate it when they run it on Network TV, and some tight-ass has edited out all the (eruptations) so all you hear during the campfire scene is the crickets chirping... Totally ruins the punch line at the end. If they translated all the Yiddish words and names (like Lilly Von Schtupp) that were slipped in before they censored the movie, they could NEVER run a Mel Brooks film on Network TV ever again - and that might turn out to be a good thing. I prefer my funny uncut, like the director intended. -- Bruce -- -- Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop Electrician for Westend Electric - CA726700 5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545 Spamtrapped address: Remove the python and the invalid, and use a net. |
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On Sun, 21 Nov 2004 21:33:50 -0800, Winston
vaguely proposed a theory .......and in reply I say!: remove ns from my header address to reply via email Old Nick wrote: On Sat, 20 Nov 2004 18:31:26 -0800, Winston vaguely proposed a theory ......and in reply I say!: remove ns from my header address to reply via email Old Nick wrote: (Snip) Here I have more trouble agreeing. If it says 350lbft, then it should do 350lbft, whatever the usage it's then not suitable for. RUHRA! ('Gabby Johnson', _Blazing Saddles_ 1974) Sorry...you lost me there.. I was enthusiastically agreeing with your statement about truth- in-advertising. OK. Fine. I did get the other bits about the candy man etc. Forgot that bit. |
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