Tips and tricks for long slender lathe parts

[Music] welcome back doc stools on top well I got a kind of an interesting project here for you guys today it's a little plastic turning job and there's some actually really good lathe techniques and tool techniques in this that are worth checking out and then there's a message at the end let's just put it that way okay so let's take a look at the drawing and then we'll fly over to the lathe and turn some stuff here's our here's our little challenge part this is made out of plastic and it presents some some challenges we have a taper we have a slenderness ratio was what we call it diameter to length and we have a taper that terminates you know the desires they have a pretty sharp tip so yes that presents some problems but there's some ways of handling that with tooling and technique to make something like this actually fairly easy so this is a two and a half inches long and I don't know what is that that's 60 millimeters or whatever or something like that right and the diameter is Oh eighty right so that's what what is it like twenty like thirty to one or something slenderness ratio right somewhere in that region and which presents some challenges a you know for any kind of shafting even if it was actually fairly large to turn it and and turn it unsupported that's the key there so anyway let's go over to the lathe let's get quacking on this and see what we can do so here's our starting material it's 25 millimeters and I am 25.4 whatever and we're gonna have we're two and a half inches long is our finished part but we need a little bit a little bit of clearance clearance to get in there with a parting tool and knock that thing off so what I'm gonna leave a quarter-inch that's probably flying okay so you'll notice starting I'm starting with some fairly large diameter stock right well the reason for that is this is you know this is stiff right in bending so it really helps support the the part as we work on it so if everything is perfect you know you could just turn this a little bit at a time and just keep moving along here and and then your part would just emerge out of there which is kind of what we're gonna do so you'll see that so the second thing is the tool here and what we got here is we have a high speed steel tool and it's been ground and actually lapped on the edge so that it's just razor sharp and tiny little little nose radius on it not much at all I don't want any and what kind of minimal pushing forces to deflect my point that we need there so the other thing when you have to turn to a kind of a minimum diameter there it's really important that your tool is dead nuts on the center and so that takes extra care and yeah you know so you're not going to be using the you know the the ruler trick to set your tool you really need it in a pretty much spot-on Center and you know with within thousandths or better actually so and then it then it'll behave itself so so anyway here's our basic set up and I got a grooving tool but you'll see that in we cut the the groove the rings and the the rear end of that thing so though you got no pip that's when you you know you got a pretty good on center there alright so what I'm going to do is I'm going to turn it back a little ways what happened it's gonna peel this up in one shot here back about a half of an inch which is the taper so that what that is that represents the the tapered section of our part and but you can see it's still well supported by this large diameter here and then the you know this is actually still fairly stiff - so all right it's out of our way all right now I have to feed with the compound the compound is already set at five degrees which will produce a 10 degree included angle so I'm going to come in get close to where I want to be which is right about there okay and go from there feed with the compound now whoa [Music] look at that don't stick your finger in there I'm gonna come back to my starting place I'm gonna step turn this they'll come into my my my finish diameter here all right to have too much left the machine there like that in [Music] yeah be careful there that the chips can actually damage the part pretty easily so let's come in again and then it's kind of rinse and repeat here [Music] I'm clearing out the chip pan so that I don't accidentally vacuum it out by catching the chip and continue on all right well now you get a we got a long skinny thingamajiggy so this thing has basically no strength at all at this point but we still got to put our little grooves in the this end of it here now you know we can cut it off and we could reach uh KITT but that's no fun now let's do it the hard way so let's get this out of here [Music] don't hit it I'm a little tiny grooving tool there okay so like I said before this thing is completely floppy right and you know if we drive this tool into this it's just gonna push it out of the way so what I got here is I got a little guide okay this is gonna go in the tailstock and I've got a I think that's rule on a little piece that's just pressed into a tube here that's gonna go in the in the tailstock and it's gonna be like a little miniature steady rest we're gonna slide it up right next to the tool and oops I don't want to dink this point I'm gonna slide it right up next to the tool and it's gonna help support that when we turn that that little ring groove on there so sneak it up nice and close and we can get you know like right up right up next to the tool on like that okay I think we're ready for close just a right reminder these tools have been calibrated already okay so you know if I did that off-camera alright so our diameter Oh 68 was [Music] [Music] get a measuring tool in there three right there all right I'm gonna extend this out just a little more like dad private next to where we're the business [Music] [Music] and actually in fact you know what I'm just gonna I'm just going to knock this thing off right now and that's gonna be my little catcher my little catcher sleeve let's just do it [Music] [Music] and we're just gonna put this on hand tight you don't need the Conan death grip on that okay we're just gonna face that little that's really hard to see there there's a little pip on there we're just gonna face that off sneak that little bit off there I'm holding it in it in a ER call it because it's so small [Music] if so damn small the polish that edge a little bit [Music] we're going look at it yeah it looks pretty good okay yeah and then our public service announcement for this is it's okay to be different in a sea of sameness thanks for watching guys [Music] you [Music]

Channel: oxtoolco

Views: 57,025

Keywords: How to turn plastic in the lathe, Slender part turning, Long skinny lathe part, Toothpick, How to sharpen high speed lathe tool, Tips and tricks for lathe, Lathe tricks, Precision lathe work, Taper turning, Lathe steady rest

Id: thrvEhufJJM

Length: 16min 30sec (990 seconds)

Published: Tue Jan 21 2020