Pillow Block Bearing problem

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Hello,I'm currently in the process of building a homemade drum sander for my woodworking shop.  I picked up two 3/4" pillow block bearing assemblies today and a 3/4" mild steel rod.  I've run into a problem.  The inside of the bearings measures 0.746 and the rod is 0.751.  Is there a special type of rod that has to be used for these bearings?  The rod fits fine in the drive pully I picked up.I've got a welder and a grinder that I use as a weekend warrior around the house.  Any thoughts on how I can accurately get this rod fixed without a lathe?Thanks for all of your help and suggestions.
Reply:Get some 19 mm (.748) metric rod.
Reply:You in fact got 19MM bearings..Take them back and get the correct ones in english.. .750 ID.Take the shaft with you...Someone in packing can't measure.Or they came from who knows where land...And I also think your measuring devices are just a little off...750 rod measures .750...not .751.So close yet so far......zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:You could run a "brake hone" through the bearings.   I would check out a bearing site (i.e. Timken) and see if .005" is an acceptable press fit.  Enjoy.
Reply:Originally Posted by zapsterYAnd I also think your measuring devices are just a little off...750 rod measures .750...not .751.
Reply:Originally Posted by zapsterYou in fact got 19MM bearings..Take them back and get the correct ones in english.. .750 ID.Take the shaft with you...Someone in packing can't measure.Or they came from who knows where land...And I also think your measuring devices are just a little off...750 rod measures .750...not .751.So close yet so far......zap!
Reply:Surely my HF measuring devices can't be off any   Trust me, if I did this kind of stuff for a living, I would have much better tools.My choices around here are limited as to where I can get this stuff.  I'll go back by and see if they have the correct ones.Thanks for all of the input.Last edited by wicrules; 10-17-2012 at 07:47 AM.
Reply:BTW, here is a link to something similar to what I am building- http://www.rockslide.org/drum%20sander.html
Reply:If you can't return your bearings or rod as previously suggested, take your rod cut to length, and use a 1/2 variable speed drill on its slowest setting. Lightly run a mill bastard file over it, and polish off the burrs with emery.If you have a vice with pipe jaws I would get a scrap of electrical condiut and clamp it in the vise, then slip the rod through it to keep it from dancing around.Your only taking a couple of thousands off the ends of the rod and it shouldn't take long. Make sure your bearing fits by slipping them over the rod before un-fixturing it, and chuck your calipers in the **** tool bin.
Reply:I'm going to try and take them back.  However, if I can't or they don't have anything that works, I may give filing it down a try.Thanks!
Reply:Originally Posted by zapster...And I also think your measuring devices are just a little off...750 rod measures .750...not .751....
Reply:Originally Posted by wicrulesI'm going to try and take them back.  However, if I can't or they don't have anything that works, I may give filing it down a try.Thanks!
Reply:Originally Posted by fredschromIf you can't return your bearings or rod as previously suggested, take your rod cut to length, and use a 1/2 variable speed drill on its slowest setting. Lightly run a mill bastard file over it, and polish off the burrs with emery.If you have a vice with pipe jaws I would get a scrap of electrical condiut and clamp it in the vise, then slip the rod through it to keep it from dancing around.Your only taking a couple of thousands off the ends of the rod and it shouldn't take long. Make sure your bearing fits by slipping them over the rod before un-fixturing it, and chuck your calipers in the **** tool bin.
Reply:If they are short enough sections, get some 3/4 long shank bolts with a long enough unthreaded section, cut the threads and head off and use those.
Reply:" How is he going to chuck up a 3/4" dia rod in a 1/2" drill chuck? "I forget the limited tooling guys sometimes: http://images.search.yahoo.com/image...umb=UxhxLQifJm.I wouldn't do it that way, I have a lathe and its a 10 min job. Sorry for the rotten long link, but I wasn't into a long internet search tonight.  I have a very similar adapter ( actually a three ) that I keep around for my drill bit extensions and lathe. Honestly I don't even remember what I bought them for too long ago before I bought my lathe, now I just make pieces like that when I need to.They are useful on occasion though.
Reply:" Honestly I don't even remember what I bought them for too long ago before I bought my lathe"I remember now it was adapters for my shopsmith to hook up a a sanding disk.Think I go 1/2 to 1 inch in various adapters, the one I use the most is 1/2 to 5/8.I leau of having one, use a 3/4 ID DOM tube, and slide in a 1/2 ID DOM into it, and slip a 1/2 rod into and weld it up. Drill and tap 2 holes into the 3/4 DOM for set screws. A couple of strokes with a file on the 3/4 round to make a flat for the set screws.Pretty simple really.
Reply:Well, finally got the drum put together and mounted in the bearings.  Got the motor hooked up and turned it on.  Nothing went flying and the drum spins .  Apparently, the shaft I am using has a slight bow in it and causes a wobble.I've ordered the shaft millrat suggested and it will ship Tuesday.  In the meantime, is there any way to "true" this thing up?  I've thought about putting a board with 60 grit sandpaper on it under the drum and letting it grind away.
Reply:Can you post a pic of the machine?...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Originally Posted by zapsterCan you post a pic of the machine?...zap!
Reply:Interesting, Not what I was expecting. I was either thinking a spindle type sander or one of the belt sanding rigs I've sen frequently posted..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Originally Posted by DSWInteresting, Not what I was expecting. I was either thinking a spindle type sander or one of the belt sanding rigs I've sen frequently posted.
Reply:Just a quick update..... got the axle rod and made a new drum from laminated pieces of 3/4" plywood.  Drum works great now.  I've attached a picture of the first cutting board that was run through the sander.Thanks for all of the info and help on this build! Attached Images
Reply:Very nice Cutting board. .  Very good sanding machine.  They say the proof is in the pudding. Mac
Reply:Thanks for the compliments!  I've always been leary of trying end-grain cutting boards due to their difficulty in sanding.  The drum sander makes all the difference.