Will42805 Posted June 13, 2018 Author Share Posted June 13, 2018 Im thinking that maybe i should gust go with a vfd, 3 phase, direct drive, 1700 rpm motor till i can afford a 3600rpm one with an 8 inch wheel. Ive never been the start out small and continuously upgrade sort of person. Better to just save up and do it right. Link to comment Share on other sites More sharing options...
WayneCoeArtistBlacksmith Posted June 14, 2018 Share Posted June 14, 2018 Stay with an 1800 rpm motor if you get a KBAC drive. You can set the VFD to run double speed if you get an inverter designed motor. Let me know if I can help you. Link to comment Share on other sites More sharing options...
rockstar.esq Posted June 14, 2018 Share Posted June 14, 2018 Will, If you are using a VFD, speed adjustment will be accomplished electrically. If you wanted higher speed, you'd increase the frequency to your motor. Most people use speed controls on belt grinders to slow them down. It doesn't get mentioned very much, but fine grit abrasives have much higher surface contact than coarse ones. This means that with equal speeds and feeds, fine grits have more friction which generates heat. I have a fixed speed belt grinder that's frankly, way too fast for fine grits. A few seconds of contact would easily draw temper colors with my finest belts. If it were me, I wouldn't add anything to your grinders drivetrain that increases speed, vibration, or work for your motor. Link to comment Share on other sites More sharing options...
Kozzy Posted June 14, 2018 Share Posted June 14, 2018 A 15 tooth sprocket in the drive train will induce a sinusoidal speed variation in that train of 2.19%. So...whatever speed you are trying to run at will actually be varying by 2.19% with each sprocket tooth. The reason I bring that up is sometimes 2% can be significant enough to feel and cause vibrations in machinery...sometimes not. ALL chain drives will do this, the smaller the sprocket tooth count, the greater the effect. People in my business have this nasty habit of wanting 6 tooth sprockets (I use mostly 6" pitch chain so the notion of 6 tooth isn't whacky) which introduce 13.4% speed variation with each tooth engagement. Oh..chain size. Note that the HP ratings in the books are for PERFECT situations..no misalignment or uneven loading, smooth energy transfer, perfect lubrication, etc. Go bigger. IIRc you mentioned # 35 and that's too small, even if the book says otherwise. I'd skip the roller chain on a belt grinder anyway. There are better choices for that situation. Link to comment Share on other sites More sharing options...
Will42805 Posted February 5, 2019 Author Share Posted February 5, 2019 Well its been a while i just ordered a 2hp 3ph tefc iron horse motor from automation direct. 3600 rpm. Going to direct drive the drive wheel. Where would i look for a decdnt quality drive wheel Link to comment Share on other sites More sharing options...
ThomasPowers Posted February 5, 2019 Share Posted February 5, 2019 Probably on the threads and plans that cover building your own belt grinder. Link to comment Share on other sites More sharing options...
Will42805 Posted February 7, 2019 Author Share Posted February 7, 2019 Well here is what im planning on... xxxxxxxxxxx for the drive wheel Vfd xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Commercial links removed, I suggest you read the ToS for IFI and post what you want to say rather than linking to commercial sites to say it for you Link to comment Share on other sites More sharing options...
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