Mill (grinding) (redirect Grinding mill)

Mill (grinding) (redirect Grinding mill)
A grinding mill is a unit operation designed to break a solid material into smaller pieces. There are many different types of grinding mills and many types of materials processed in them. Historically mills were powered by hand (mortar and pestle), working animal, wind (windmill) or water (watermill). Today they are also powered by electricity.
The grinding of solid matters occurs under exposure of mechanical forces that trench the structure by overcoming of the interior bonding forces. After the grinding the state of the solid is changed: the grain size, the grain size disposition and the grain shape.
Grinding machine (section Types of grinders)
A grinding machine is a machine tool used for grinding, which is a type of machining using an abrasive wheel as the cutting tool. Each grain of abrasive on the wheel's surface cuts a small chip from the workpiece via shear deformation. Grinding practice is a large and diverse area of manufacturing and toolmaking. It can produce very fine finishes and very accurate dimensions; yet in mass production contexts it can also rough out large volumes of metal quite rapidly. It is usually better suited to the machining of very hard materials than is "regular" machining (that is, cutting larger chips with cutting tools such as tool bits or milling cutters), and until recent decades it was the only practical way to machine such materials as hardened steels. Compared to "regular" machining, it is usually better suited to taking very shallow cuts, such as reducing a shaft's diameter by half a thou.

Free grinder-worth restoration?(grinding mill)
Question:I was asked by a friend who runs a slideback truck in his spare time if I wanted a free machine. Of course I said yes (it actually cost me id="mce_marker"00 "donation" to my friend's truck fund, and usually worth it. This time I wonder though.
I was told it was some kind of grinder. When it arrived, I found it was a Universal ID/OD machine, complete, and included the manual. That was all the good news though. While not horribly rusted, nothing moves, at least not easily.
So the question is, should I restore ? I should add that while I have a fair bit of experience, and other machines, I'm approaching this machine shop adventure as a part time thing with the hope that it might pay off. What are your thoughts?
Reply:Shoot WD all over the moving parts several times then see what happens. If it has been sitting for years it could be just a lot of really gummy crap accumulated. Just a thought -- if ya don't like WD then a comparable product of your choice, then decide if restoration is a good choice.
Getting the grinder(grinding mill) so it moves is just the begiining. Grinders can be in horrible shape if not cared for when they were running. Perhaps you can judge quickly by examining the tailstock quill. Here's a part that gets moved with every part ground, but needs to be in good shape for you to not be frustrated. How much slop is in the quill? Is it worn significantly? I once got a Landis full universal grinder, that the tailstock quill could be moved in the housing almost a quarter on an inch. If the tailstock has significant wear, the rest of the machine does too. Check under the tailstock, to see if anybody bothered cleaning the swarf off before they slid the tailstock down the table. Wear on the underside of the tailstock casting, indicate poor housekeeping by the prior operators.
Is an old grinder worth taking apart and cleaning up- you bet, but not if it's an old worn out machine. Sometimes the almost free machines aren't the bargain you'd think. Much better to spend five or six grand for a good used grinder, than start with a piece of junk. But if your tailstock looks good, and has the feel of a precision machine tool part, you may have an okay machine.
Anything is worth rebuilding if you can make up the costs. I rebuilt machinery for a living. I just got done doing table rebuild on a old machine. They are happy with it. I personally am not. If you can get the spindle to move. You are getting there. K-1 on everything will help. Try turning the motor pulley to see if the can get the spindle free. If not. Take a heavy rubber hammer and hit the end of the spindle a few times. Do go crazy like some knuckle dragging ape. Then see if it freed up. Is the lube tied into the spindle? Or is it a separate system? I think that grinder uses brass taper bearings. Worse case is you take the cover off the top and take the wheel off. You will see some nuts on the end of the bearings. Loosen up the inner nuts and tighten up the outers. This will loosen up the spindle to the bearings. You will need to do this on both sides. If this works. Clean out the spindle cavity and put new oil in the spindle head. Do you have small valves over the two spindle bearings? If so. Turn them on all the way. Hook up the power. Jog the spindle. This will get messy. Don't let it run. Get all the crap out of the bearings. Then reset the clearance to the spindle to .002 to .003 clearance. Providing they are brass. You check the clearance by putting a quality dial indicator on the spindle. Use a chain fall or crane of some sort to lightly lift the spindle. Use a nylon strap for this. Then once you get this done. Start the spindle. Let it run. Watch the temperature. It will run as high as 110*F Also put an amp meter on the spindle motor. What this dose is lets you watch the load on the motor. If the amperage starts to climb. Shut it off. Let it cool down. then add .001 more clearance. You are doing this at your own risk! I will not be responsible for you messing up your machine.This is to be used as a helpful hand!

grinding mill machine for industrial.
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Mill (grinding) (redirect Grinding mill)