Aditya B Posted December 7, 2015 Share Posted December 7, 2015 After blowing up 2 chinese air blowers on first runs I have decided to make my own air blower (hoping good use of my old 0.5hp motor ) Specification Power - 0.5 hp / 1440rpm Dia of Housing - 10 inch Dia of fan - 8 inch Width of fan - 25 mm Out Vent Dia - 1 inch Right now Mounting Shaft is gone to friends shop for internal key way hope it will do my work will keep all informed when it will perform Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted December 7, 2015 Share Posted December 7, 2015 See the lirics to "third rock from the sun".... at that speed it has to be a well built and balanced fan. Are you fabricating or using a pre-made one? Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted December 7, 2015 Share Posted December 7, 2015 Is an internal keyway the same thing as a woodruff key? A little metal piece that stops a wheel spinning separately around it axis. Quote Link to comment Share on other sites More sharing options...
Aditya B Posted December 7, 2015 Author Share Posted December 7, 2015 2 hours ago, Charles R. Stevens said: See the lirics to "third rock from the sun".... at that speed it has to be a well built and balanced fan. Are you fabricating or using a pre-made one? My search for premade in market is going but many of associates gave Me Negative replies But i do have my backup plan of fabricated fan with tapered and positive rake angled blades 1 hour ago, Stephen Jones said: Is an internal keyway the same thing as a woodruff key? A little metal piece that stops a wheel spinning separately around it axis. Yes internal key way is in holes to hold those keys Quote Link to comment Share on other sites More sharing options...
Aditya B Posted December 7, 2015 Author Share Posted December 7, 2015 I had some more progress done before leaving for home fan blades are tapered and positive rake angled to push air towards wall Quote Link to comment Share on other sites More sharing options...
Duckwalk Posted December 7, 2015 Share Posted December 7, 2015 If you have any balancing issues on the blades (IE: alot of vibration) I read somewhere that people were using rivets to balance them. Quote Link to comment Share on other sites More sharing options...
Aditya B Posted December 7, 2015 Author Share Posted December 7, 2015 1 hour ago, Duckwalk said: If you have any balancing issues on the blades (IE: alot of vibration) I read somewhere that people were using rivets to balance them. thanks for idea duckwalk will try it when i will take first run Quote Link to comment Share on other sites More sharing options...
Panday Posted December 7, 2015 Share Posted December 7, 2015 I'd seriously reconsider this. I would *not* trust the quality of those welds at 1440rpm. Your weld prep is non-existent, and flux core wire is ill advised for this under the best of situations. Your backing isn't going to be stable enough to resist the centrifugal force of the blades which will drive them into your housing at speed and *really* test your welds. Not to mention those blades will effectively be little more than tissue paper trying to move air at 1440rpm. Why not just use a motor/squirrel cage from a preexisting fan setup? Or even find a squirrel cage from an automotive application and fit it to your motor? Quote Link to comment Share on other sites More sharing options...
Borntoolate Posted December 8, 2015 Share Posted December 8, 2015 or do it handcrank at least at first to see how it works. 1440 rpm, if it works, gonna blow your coal outa the firepot..... Possibly blades with it. Hand crank lets you put air when you need it too and at the right amount. u gonna be able to get that thing in there???? Quote Link to comment Share on other sites More sharing options...
Smoggy Posted December 8, 2015 Share Posted December 8, 2015 Rather than make the assumption, I'll ask............Anditya, are you intending running the fan directly from the motor at the full rpm rating, or will you be including some form of reduction gearing between motor and fan? Quote Link to comment Share on other sites More sharing options...
Aditya B Posted December 8, 2015 Author Share Posted December 8, 2015 15 hours ago, Panday said: I'd seriously reconsider this. I would *not* trust the quality of those welds at 1440rpm. Your weld prep is non-existent, and flux core wire is ill advised for this under the best of situations. Your backing isn't going to be stable enough to resist the centrifugal force of the blades which will drive them into your housing at speed and *really* test your welds. Not to mention those blades will effectively be little more than tissue paper trying to move air at 1440rpm. Why not just use a motor/squirrel cage from a preexisting fan setup? Or even find a squirrel cage from an automotive application and fit it to your motor? 1. these welds what you saw here are just tac weld i am going to full weld those from both sides 2. as far is welding on speed rotation considered i have seen many of my welded job turning on high speed and taking deep cuts and welds always worked fine 3. when the backing comes in play the back or housing which you are viewing right now is going to weld on one metal structure which will going to hold motor and housing both 4. i am still searching for appropriate squirrel cage/ fan blade in market but i am not getting one. 9 hours ago, Borntoolate said: or do it handcrank at least at first to see how it works. 1440 rpm, if it works, gonna blow your coal outa the firepot..... Possibly blades with it. Hand crank lets you put air when you need it too and at the right amount. u gonna be able to get that thing in there???? i havent thought about handcrank i need to reduce human efforts but i am going to put valve or damper in between blower and forge to control the flow Quote Link to comment Share on other sites More sharing options...
Aditya B Posted December 8, 2015 Author Share Posted December 8, 2015 9 hours ago, Smoggy said: Rather than make the assumption, I'll ask............Anditya, are you intending running the fan directly from the motor at the full rpm rating, or will you be including some form of reduction gearing between motor and fan? right now i am thinking about full speed and direct mounting but if problem comes i do have option of step down pully Quote Link to comment Share on other sites More sharing options...
flemish Posted December 8, 2015 Share Posted December 8, 2015 I am thinking of doing the same thing with the blower out of a clothes drier. I have the fan and housing, I just need to mount it on a motor. Flemish Quote Link to comment Share on other sites More sharing options...
JeepinJoe Posted December 8, 2015 Share Posted December 8, 2015 I think you should figure out why the Chinese blowers burned up. It could be your setup. If you shut off the air to your forge are you dead heading the air? If so, that could burn up your blower. I know a lot of blowers can't handle the pressure that causes and they fail. Quote Link to comment Share on other sites More sharing options...
SmoothBore Posted December 9, 2015 Share Posted December 9, 2015 18 hours ago, JeepinJoe said: I think you should figure out why the Chinese blowers burned up. Ladies and Gentlemen, please hold all cards, ... we have a BINGO. "Reinventing" the wheel, is seldom the solution to any problem. ----------------------------------------------------------- As a young man, ... ( which occurred a VERY long time ago ) ... all my friends were hot to "soup-up" their cars, with a variety "hotrod" modifications. Big carburetors, ... wide rear tires, ... traction bars, ... and exhaust headers, ... were "all the rage". Yes indeed, ... garden variety high school clowns were sure they knew better than the best Automotive Engineers in the World. And they created some God-awful abortions, ... that wouldn't go down the road in a straight line, ... nor would they take a corner without hopping and sliding all over the road. The results were quite predictable, ... and sometimes tragic ..... I think there's a lesson there, ... that applies to this situation. . Quote Link to comment Share on other sites More sharing options...
Aditya B Posted December 13, 2015 Author Share Posted December 13, 2015 so far so busy these days but i managed to have some progress i managed to put fabricate housing with a elbo as i do have a bottom blast except elbo all other parts are coming from my scrap there is a flow control which is just been in design and i have used it first time will provide more detail about it when it will work but for info when you move this hex head this will change amount of air out And for all the balancing Fans Yess!! my fan is already is pretty much balanced and didnt gave any kind of balancing problem in my test run!! And thus it is proved that you can make your own fan in welding workshop Quote Link to comment Share on other sites More sharing options...
Aditya B Posted December 13, 2015 Author Share Posted December 13, 2015 On 12/8/2015, 10:40:24, JeepinJoe said: I think you should figure out why the Chinese blowers burned up. It could be your setup. If you shut off the air to your forge are you dead heading the air? If so, that could burn up your blower. I know a lot of blowers can't handle the pressure that causes and they fail. i found out that those chienese blowers were not meant to be made working for long time, in long term run the whole roatar and field windings got heated up and due to collasion winding got short Quote Link to comment Share on other sites More sharing options...
Daswulf Posted December 13, 2015 Share Posted December 13, 2015 Good to see it's coming along. if it's balanced then thats good. Quote Link to comment Share on other sites More sharing options...
jacob's hammer Posted December 13, 2015 Share Posted December 13, 2015 may seem balanced until the bearings give. lol. good luck. Quote Link to comment Share on other sites More sharing options...
BIGGUNDOCTOR Posted December 13, 2015 Share Posted December 13, 2015 When I made replacement fans for parking lot sweepers I bent a foot at the base of the blade to make it easier to weld them to the backing plate , and keep them closer to 90°. They also had another wide ring welded across the tops to make it more like a squirrel cage. These fans were around 16" diameter and 4" thick, so we had them professionally balanced for the RPM of the engine running it. I would add an extra layer around the outside of your housing to contain the bits just in case it does come apart. Quote Link to comment Share on other sites More sharing options...
Aditya B Posted December 15, 2015 Author Share Posted December 15, 2015 so the the waiting ends right here I managed to complete it with fabricating a stand for it more descriptive images are here Quote Link to comment Share on other sites More sharing options...
Mark Ling Posted February 8, 2016 Share Posted February 8, 2016 why didny you just use the body frome the Chinese junk ones and just switch the moters ? im sure that its an obviose reason, but that im to "dumb" to realize it right now. Littleblacksmith Quote Link to comment Share on other sites More sharing options...
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