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Mcgyver
08-11-2005, 04:33 PM
I recently came into possession of a grinding wheel balancer, and having fun with the digital camera, recorded the exploits. Prior to, I didn’t know much about balancing grinding wheels so thought that maybe posting on it would help some people. The basics i learned via Jan Rowland’s article at
http://www.homemetalshopclub.org/news/sep04/sep04.html

some good info there on making your own.

It may or may not help on a bench grinder but on the T&C cutter grinder or surface grinder it can make a real difference.

Here’s a nice balancer that came my way. I was surprised to find its metric, $38 for metric die to make a new foot that was hopelessly bent.
http://i20.photobucket.com/albums/b201/michael0100/balancing%20a%20grinding%20wheel/wheelbalancewithnewfoot.jpg
I barely had enough room to start a tap with making extensions and once started had to use a wrench. The pillar tool is used to make this awkward start straight.
http://i20.photobucket.com/albums/b201/michael0100/balancing%20a%20grinding%20wheel/tappingwheelarbor-justenoughtogetit.jpg
here’s the finished arbor. I must have had a hole go slightly off or some thing as the plate shown need a tiny bit of balancing itself.
http://i20.photobucket.com/albums/b201/michael0100/balancing%20a%20grinding%20wheel/completedwheelbalancingarbor.jpg
next it’s the balancing weights. I made them from two thicknesses, .025 and .031. I wanted a very accurate fit on the arbor so that error wouldn’t induced between disassembling on the arbor and installation on the grinding spindle. The four sheet metal pieces are sandwiched between a couple of metal plates
http://i20.photobucket.com/albums/b201/michael0100/balancing%20a%20grinding%20wheel/boringsheetmetalweightssandwichedbe.jpg
After boring, I laid out, sheared and then filed to shape the weights.
http://i20.photobucket.com/albums/b201/michael0100/balancing%20a%20grinding%20wheel/weightsreadyforshear.jpg
here are the finished weights, identified by number. The number will help get it right when its reassembled on the spindle.
http://i20.photobucket.com/albums/b201/michael0100/balancing%20a%20grinding%20wheel/finishedandnumberedbalanceweights.jpg
the balancer’s got a small internal level. I checked and adjusted this with a precision level, will probably do this each time, the internal level is not super sensitive.
http://i20.photobucket.com/albums/b201/michael0100/balancing%20a%20grinding%20wheel/checkingandadjustingbalancersintern.jpg
here’s a final shot of it in use. The location of each weight is marked on the blotter and then its reassembled on the grinding spindle.
http://i20.photobucket.com/albums/b201/michael0100/balancing%20a%20grinding%20wheel/balancerinuse.jpg
The wheel shown, a “triumph” which I think is KBC’s house brand and was in terrible balance, causing noticeable vibration in the machine and on the cut. After balancing, it runs as smoothly as the spindle does empty!


[This message has been edited by Mcgyver (edited 12-11-2005).]

rockrat
08-11-2005, 06:54 PM
Nice work, thanks for sharing.
I have often thought about making a balancing device for the wheels at work. It just seems to be one of the things on my list that needs done.
rock-

topct
08-11-2005, 06:56 PM
This is a keeper.



------------------
Gene

speedy
08-12-2005, 12:28 AM
Appreciate your efforts in posting; fine, thorough work that will motivate a few.

A cheapy method for balancing the w/shop bench grinder wheels. Drill and tap one or more holes in the perimeter of the outer disc, then loctite a screw of sufficient mass to counter the out of balance factor.
Or a custom sheetmetal washer with the same facility held captive between the disc and stone.
Ken

[This message has been edited by speedy (edited 08-12-2005).]