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so youre standing in front of an OD grinder and your job today is to grind a part with an OD and a flint and a face or a flange as we call it why is that important why is the flange important because if you dont do it correctly you can end up with a taper on here Im talking about on the face not on the OD but it wont be flattened it can be perpendicular to our OD but not necessarily flat this way let me show you what I mean by that heres our point of reference thats a bed of our table and heres our head stock in our tail stock and as a rule the tail stock wears in the OD grinder because its always sliding back and forth and it ends up being lower than the headstock centre how do we fix that if youre grinding the OD only you can fix that by taking the tape rod does that mean anything well it sort of kind of does but it doesnt its
not that important let me show you what I mean by that heres your grinding wheel and a pretty good grinding wheel huh theres our Center when were at this end our point of tangency is going to be 90 degrees like Solan when were over here because its lower remember its lower now so its gonna be tangent in a different spot does that mean anything no but its good to know why is it good to know well lets look at our grinding wheel heres our grinding wheel again when were grinding like so before weve made our adjustments Glen which side do you think is going to be bigger when I move this along our reference line correct the right side is going to be larger in diameter so we can get the taper out by moving the adjustment in the machine remember theres a knob over there we turn that and that moves that table in so thats how we get the taper out so yes were grinding it and the center is below where it
needs to be does it matter not really some Im grinding this shaft it doesnt matter if the point of tangency is here and over at this end its a little lower I can still move the table in and out to compensate for that but where it is important is if were trying to get a cross hatch or crisscross pattern like this you get a good shot of that right on it okay good so in this case were gonna grind this guy and we got a grind the OD and weve got to grind the flange heres kind of what it would look like if youre standing at the machine as you are Glenn and heres our wheel and our part is cut so we are basically going to be grinding an angle on there its going to be tapered whether youre this way or this way how do we fix that easy the first thing we do is we adjust our tail stock to make sure that we get it square to the park our square
to the wheel rather like so so we move the tail stock with shim stock at one end and we raise it up so it is now pretty much square with the wheel if we do that if its touching here for example this is the pattern youre going to get on your partner if its touching down here youre going to get this kind of a pattern and when you put the two together you get a crisscross like so not a very good crisscross but you get the idea that will only happen if the tailstock is adjusted so it is perfectly square with the wheel thats all whats gonna happen cant happen any other way if you have to grind a flange my recommendation is this a deal with the criss-cross first shimmy your tail stock up to get the crisscross pattern and its easy to see you actually you can watch it on the machine and again if you just look at this youll be able to figure out whether its at the top or at
the bottom whether you need to raise it up or bring it down once you do that now you get the taper out to get the taper out take a look at the video that we did a few months ago on how to get the taper out of an OD grinder that shows exactly how to do it and how to do it without grinding the part supposing you only have a few thousands on your part and youve got to take off to thousands lets say you dont have enough stock in there to grind it to get the taper out but theres a magic way to do it which we were thrilled to share with everybody weve got a lot of great comments on it its a great trick take a look at that video thats how you get the taper out so one get your crisscross pattern on your flange first if you have a plant that you need to drive secondly get the taper out grind your part youre cool to go thanks for watching
crosshatch, Don Bailey, Suburban Tool, Surface grinding, ID grinding, machining, precision grinding
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