Video instructions and help with filling out and completing Why Form 8815 Employment

Instructions and Help about Why Form 8815 Employment

Howdy tubal-cain again you know one of the perennial problems of a lathe operator our machinist is to keep his tails in alignment so today we're going to show you a little bit different way than what I've shown you before on how to do that we're going to make a test bar similar to this and this is a page out of the South Bend how to run a lathe book and shown here is a bar between centers with enlarged parts here that could be put between centers and turned down and then miked on each end to compare the two and adjustments made until the diameters of the two are the same now I don't know why they're showing calipers on there instead of the micrometer because that's that's not the way we're going to do it at all that just doesn't accurate enough this is the text from below the picture that I just showed you in the last scene so if you want to read that pause your video and read through those two paragraphs some of you may have a test bar and a test bar would be a 10 inch piece of 1 inch stock that is hardened and ground and tested to be perfectly concentric and the dimension the same on both ends this is just a piece of cold rolled steel and this is what we're going to use but this isn't nearly accurate enough now you could in fact I've got Center holes drilled in there already in both ends you could in fact put this between the center's and turn the whole thing down and compare the measurements or a smaller shorter bar but that would be impractical we're going to do it more like the picture I just showed you in the book again this is one-inch stock and they are 11 inches in law and length and I just measured it this one has not been faced yet or Center drilled so put this in the lathe face both ends and Center drill it as accurately as you can this is soft mild steel I believe it to be 10 18 I know I tend to turn everything into a casting project but I guess that's because I've got a home foundry but it's come to my attention there's probably only a hundred men in the entire United States that have home foundries so this can be done with blocks of steel or blocks of aluminum that you you have purchased it doesn't matter what the material is the softer the better it just makes the whole job easier and faster when you do the tailstock alignment but I made two patterns and these are about three inches in diameter and they're inch and a half thick because this is a well it was a piece of a 2x4 is what it was these of course are tapered and have foundry draft on them and I went ahead and we had some nice weather this winter and I made the castings now I haven't separated them yet I just wanted to show you how I gated it and the sprue where I poured the metal came down through here and this is a riser which is to be thrown away actually I'll remelt it that controlled the shrinkage otherwise if you don't use a big block riser like this called a riser you'll end up with rather pronounced sinkholes in here where the metal shrinks so as you can see there is virtually no shrinkage there so the next thing I'm going to do is to cut the gates off on the bandsaw and then I'm going to drill and bar and I don't think I'm going to ream I think I'll just bore it to one inch so that it fits the bar I'm over the bandsaw and I sawed through and then I saw it again so it's fairly clean now the next thing I need to do is to take this to the six inch belt sander and I'm going to sand all the way around to try to square it up a little bit remember this is tapered we've got about a three degree taper on there when we hold that in a lathe chuck is liable to fly out of there so I like to have a flat spot to do that so I'm going to simply put that on the belt sander which is right next door here this will be noisy and I'll go clear around in a manner like that remember the diameter doesn't matter very much on this I'm starting with about three inches but I as long as it ends up at least two and three quarters I'm happy that way it can be used for many many years before we wear her down to the nub I have belt sanded it in a manner such as this with an 80 grit blue belt that cleaned it up somewhat and if the light is allowing that as long as I've got a apart right here where you can see that it's been sanded that is perfectly perpendicular to the back I'm okay I don't have to to do it all the way because if the material is already getting hot friction causing heat you know that's what it looked like before I didn't get the gate all the way removed but I will straddle that when I put it in the three jaw Chuck let's step over if you will to the closing lathe the work is in the Chuck on the 12-inch Clausing lathe I want to face this off but notice how we end up being a little bit behind the Chuck jaws I don't want to hit the Chuck jaws so the way I deal with that is to take a parallel it's about a half inch thick I'm going to lay it