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Car Forum / Antique and Collectibles / Studebaker / November 2005Die Grinder & Cutoff Wheels
Okay time for a rookie air tool question. I was in Lowe's today and looking at die grinders. The two I looked at were rated at 25,000 and 27,000 rpm. When I looked at the cutoff wheels, they were rated at a maximum of 15,000 and 22,000 rpm. What do you do, just turn down the air pressure at the regulator not to run them at max rpm? Lee I've always just ignored the max speed warnings, always seemed to work fine too. Kent It is doubtful that your die grinder would develop the max rpm while turning a grinding wheel which is in contact with a work piece. > I've always just ignored the max speed warnings, always seemed to work > fine too. > Kent 1. If the cutoff wheels are made in china you turn down the air pressure. 2. find some 27,000 rpm (American Made) cutoff wheels. In either even, wear leather gloves, safety jacket and use a full face shield. Smile and welcome to the wild and wacky world of made to order Chinese Communist Tools. You'd probably do just as well going down to the Harbour Freight store. <G> Bo > You'd probably do just as well going down to the Harbour Freight store. How do you think all of this started... I've now got two, brand new, 60 gallon air compressors in my garage. One that works perfectly and one that works perfectly but has a crack in the tank. Still waiting on the e-mail telling me how and when they plan to pick up the old one. If not soon I'll just e-mail them with a deadline or else it goes out on the curb. Actually, if it came to that it'd maybe go out on the curb minus the pump and motor... and if I couldn't figure out what else I could do with the tank. Lee Turn the cracked tank into a meat smoker.Cut off the top with your new die grinder,contrive a latch to clamp it back on and remove the bung on the bottom or side and there is the passage way for the smoke and heat. Bob40 >> You'd probably do just as well going down to the Harbour Freight store. > [quoted text clipped - 8 lines] > > Lee > > You'd probably do just as well going down to the Harbour Freight store. > [quoted text clipped - 7 lines] > > Lee You could make a Texas smoker out of the tank. BBQ that is... Yum! JT If you want to be safe, you go to Grainger and get correctly rated wheels. A disk that separates can be pretty ugly... JT > Okay time for a rookie air tool question. > [quoted text clipped - 4 lines] > > Lee Now you're scaring me. I've been using the cheap wheels on 150 PSI air for 10 years and it never occurred to look at the RPM limits.<g> > If you want to be safe, you go to Grainger and get correctly rated > wheels. A disk that separates can be pretty ugly... [quoted text clipped - 9 lines] >> >> Lee  SignatureJP/Maryland Studebaker On the Net http://stude.com My Ebay items:http://www.stude.com/EBAY/ 64 R2 4 speed Challenger (Plain Wrapper) 63 R2 4 speed GT Hawk 63 R1 Gt Hawk 62 Lark 2 door 61 Hawk 60? Hawk 55 custom HT 53 coupe rod. 53 Starlight You never know when your karma wheel will freeze or that lucky horseshoe might fall on yer haid..... <G> JT > Now you're scaring me. I've been using the cheap wheels on 150 PSI > air for 10 years and it never occurred to look at the RPM limits.<g> [quoted text clipped - 26 lines] > 53 coupe rod. > 53 Starlight I'm hoping a past life really sucked because I'll never square the wheel in this one. <g> > You never know when your karma wheel will freeze or that lucky horseshoe > might fall on yer haid..... [quoted text clipped - 32 lines] >> 53 coupe rod. >> 53 Starlight SignatureJP/Maryland Studebaker On the Net http://stude.com My Ebay items:http://www.stude.com/EBAY/ 64 R2 4 speed Challenger (Plain Wrapper) 63 R2 4 speed GT Hawk 63 R1 Gt Hawk 62 Lark 2 door 61 Hawk 60? Hawk 55 custom HT 53 coupe rod. 53 Starlight its amazing how much damage one of those little wheels can do when it cuts loose. a guy i worked with was cutting overhead using a 12,000 rpm wheel in a 25,000 rpm die grinder and the center tore out. it was a real skinny one,.020" - .030". he had on long sleeves and a face shield. the wheel cut through the shirt and cut him the entire length of his arm and still went through the face shield and cut him across his face. scared the hell out of me cause i thought he was going to bleed to death right there.now i always look at the speed rating and i never spool one up to full speed . even the slightest bit of damage to the wheel and i break it in half. replacing those wheels is cheap compared to a doctor visit. homer Buy QUALITY on "spinning abrasives" could cost you your life! Remember, you get what you pay for, and pay for what you get! Being "frugal" isn't always the smartest way to be! Jim Turner > its amazing how much damage one of those little wheels can do when it > cuts loose. a guy i worked with was cutting overhead using a 12,000 rpm > wheel in a 25,000 rpm die grinder and the center tore out. As one who has spent the past 30+ years in the abrasive business, never overspeed any abrasive wheel. They are tested at the rated speed and anything over that is playing with the devil. If a 3" wheel is rated at 25,000 RPM the outer edge of the wheel is traveling at 19,750 feet/minute or 224 MPH. At that speed even a small piece coming off and hitting you can do some real damage. When ever I have become aware of a potential customer improperly using an abrasive wheel I have declined to sell it to them. Let someone else have the legal battle when they get injured or killed. Why are some wheel rated at 12,000 rpm and the one next to it on the shelf rated at 25,000? Look for the fiberglass reinforcing in the sides of the wheel. It can only hold up to the higher speed if it is fully reinforced. There are three basic bond types of abrasives wheels, vitrified, resin & rubber. Vitrified wheels are the ones typically used on a bench grinder and have a max speed of 6,500 surface feet per minute (SFPM). Non-reinforced resin bonds are typically good for 9,500 SFPM, reinforced can be higher depending on how it is reinforced. Rubber bonds are typically rated at 9,500 SFPM. My business has gradually changed from selling both bonded and coated abrasives to 99% coated. At least when an abrasive belt lets loose it won't do the kind of damage a grinding wheel will. Just remember watch the rated speed on all tools. Regards, > Now you're scaring me. I've been using the cheap wheels on 150 PSI >air for 10 years and it never occurred to look at the RPM limits.<g> I was told never to exceed 90 lbs. It will give you plemty of cutting power, and you are not over tax'ing the wheel. Had you given the air tool a squirt or two of Kroil I would cut it down to 76 lbs. Billy Kroil in air tools??? Lee >> Now you're scaring me. I've been using the cheap wheels on 150 PSI >>air for 10 years and it never occurred to look at the RPM limits.<g> [quoted text clipped - 4 lines] > > Billy I use it for them, keeps them clean and running nice. > Kroil in air tools??? > [quoted text clipped - 8 lines] >> >> Billy SignatureJP/Maryland Studebaker On the Net http://stude.com My Ebay items:http://www.stude.com/EBAY/ 64 R2 4 speed Challenger (Plain Wrapper) 63 R2 4 speed GT Hawk 63 R1 Gt Hawk 62 Lark 2 door 61 Hawk 60? Hawk 55 custom HT 53 coupe rod. 53 Starlight |
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