I Bet You've Never Seen a File Used This way !!

okay guys today's jour we are going to finish up the trunnion straps for the cannon build and when I say trunnion strap it is exactly what you're looking at right here this is the little hinge plate that holds the barrel in place so it can be elevated or dropped for aiming and it also is the let's get this barrel off the chassis device so the backside of these this part right here is actually a hinge so the strap that's in the back will go around here and then this whole entire unit will just simply pivot up out of the way so the guys in the field can change the barrel invert the barrel whatever remove it replace it okay enough said on that one the strap itself is longer on one side than it is on the other and we are going to turn this back section right here into a full cylindrical feature as you can see right now if you didn't watch the video on how this was made this was done on a rotary table so if you haven't seen that refer to that video it's just a couple back in the catalog so we'll go look at it what I need to do is remove the center this area in here turn it into a square window but against the hinge pin area here this needs to be completely cylindrical so we're going to get creative on how we turn that teardrop shape into a full cylinder to allow this thing to pivot once it's installed I think you get the idea first thing we need to do is bring these to a correct thickness and then we'll pop a hole in there and we'll broach that and then we'll do some handwork and make that round so let's take it over to the mill give you an idea on how to hold it without smashing it because this would be easily crushed and we'll get this process going all right I just cut myself a little helper block and that will allow me to set this up in the mill and push directly on the flat spots of this this will be my stationary jaw this is movable of course and you can see how it will pinch the flat areas directly against the backside jaw allow me to come across with my cutter finish off the thickness now here's a little side note for you if you have a set of parallels like this let's pull back to you and check this out there is nothing special about this set of parallels it goes from half inch to inch and five-eighths half inch inch and five-eighths now the majority of the Chuck jaws or the vise jaws on these big pert vices about an inch and 3/4 so if you know how thick your part is going to be when you're done this is an eighth of an inch under the top jaw this will allow you to mill a part two 1/8 thick without hitting the jaw so eighth quarter 3/8 1/2 and so on all the way down the line so we're going to shoot for probably around somewhere in the three-eighths on these so eighth quarter three days right there that's the set I'm gonna grab it's a real quick and dirty reference for whatever however thick your part is give you the maximum grip or not depending on if you're having squaring problem but keep that in mind good trip let's cut some brass that little aluminum block is now going to be my fingers no pressure on the top feature and I did select the parallel that's gonna give me a minimum worth of 3/8 shelf here now over thick these end up that will drive the side panels of the chassis how thick they're going to be so let's just cut both of them here down to the same size and then Center them up and cut a square hole in the end round off that axis [Music] let's change the parallels set a few stops off the square hole in it okay the pockets we're gonna put in here are approximately 200 square and I know that my brooch is around 175 so I could pop a 3/16 hole both locations let's do that first make the brooch a lot easier to go through for those of you with the really good eyes there's the undercut that I put in the very first part that I did and I'm going to use it you know it just gives it character okay 185 diameter hole we're going to pop one here and we're going to put one over here we're going to make them both square locations are 205 in initially hopefully that looks right when it comes down here's a little time-saving tip for you if you're doing more than one why bother returning the cutter to the initial location for the next part leave it right where it is it's already on location just work the second piece in Reverse anybody that's not a word that they exist I've changed over to 1/32 parallel so they are very thin and you always got to be aware of what's directly under the park chances are I would have hit these 1/8 parallels with the drill or the broach another little time-saving tip for you right here they got riser blocks under my stack here and I have a theme set 32nd set and another duplicate eighth inch set that comes in real handy and being in between the boxes like that they are not taking up bench space works out very well good idea okay there is no doubt that this is going to be too small a hole for the brooch to begin and I'm not sure in what sequence this is going to be edited but the initial impact you can see remnants of that did Bend the end here so be aware how soft the material is I really didn't want to bend it but it did Bend and luckily the little jig that I used initially to cut the thickness down that little piece of aluminum that I made in the beginning of the video worked fantastic to re straighten this thing so that worked out real well I'm going to go in here with a 1/16 anvil take out as much material as I can on both of these pockets then I will brooch it square [Music] [Applause] move down to the other end make that one square as well now when you're down inside of a small pocket like that you certainly do not want to make any mistake on which way you turn that dial because you can kiss this park goodbye in a heartbeat and that's where that mill skill challenge thing comes in when we do it out in the bash in California we also have a video on that if you haven't seen that video take a look at that one and actually those are also available on the store so that's selfless promotion right there move it down now a good way to do this if you do have a digital readout when it comes time to jump around in between features or move your endmill the specified amount from the center of that feature click over to incremental and Reaser your digital that will give you the freedom of not losing your initial location and still be able to trust a 0xy movement in an incremental mode makes it a lot easier you don't have to reset anything there we go next step in the process is to square up the broach if you have a really good eyes doop I don't put any cater on it sweep it back and forth until you to zero make sure you can access the jaw bar nut or you may have difficulty lining this up now that it's not out buy a whole lot [Applause] beauty zeroed out let's move it into position put it to work with the broach indicated true to the X&Y axis of the machine based on the size of the brooch based on the size of the pocket figure out what your X&Y moves are I am now in the incremental mode moved over to the center of that pocket this should be a lot easier to get through with the corners nibbled out oh there you go life is good set your stop walking small bites on soft material you're gonna bend it this is also a homemade brooch did it in the video can you grind on a milling machine yes you can this is the brooch I made in that video so it's coming in real handy right now these are about 2,000 criminal steps I'm taking when you do an operation like this you can feel the impact of the brooch against the material and if you pick away at it you'll feel the resistance go away and you'll hear the noise subside that's when you know you got a good non-flex cut and back to the front corner to finish there will be some hand work to clean up the radius the radii I think that's a win let's move down to the other end finish it off all right that is piece number one this will be the hinge this will be the lock it won't pivot this way let's put it on the bench and see if we can file out a bottom sharp corner there make that cylindrical I do have a plan for that just check it out all right the next challenge is to make this end round and I could wing it but I've come up with something that I think I just got to try it and I've never tried this before to be perfectly honest with you and I don't know how easy it's going to be to video but here's my jig and let's look at the concept this particular shim is cut down to the thickness of the round feature on the end now I have enough banking material here banking finished banking surfaces that as I pass this through here registering on already milled features moving this back and forth that gap should allow me to take and as I roll this both directions that should allow me to make that round makes perfect sense then again many things make perfect sense before you try them so I am going to struggle through this and I will show you what this looks like right now it's got a square corner on the bottom so I have 90 degrees worth of radius to file into it here and there's a little bit of a land right there so if this concept works I will be thrilled and I'll have a round par when I'm done let's see if I can do it sorry guys it's going to be nearly impossible to set up and film that when I have to look through the camera forgive me I will be right back with this this you're probably gonna take a couple of minutes but let's see what it looks like when it's done this is the final configuration required to do these minimal projection nice wide land and keep the already established radius against the hard side and as you move it back and forth and left you can feel the resistance going away and you can see that you truly do end up with a cylindrical feature on the end I would say that's a win I like it we're gonna tear up a piece of memory stick it through there and do the shoe shine on that see if I can shine that up call it a day I like it one more look at the setup that worked like a charm all right now I just put the calipers on this and this is around or within a sow that is one thousandth of an inch round I am very pleased with that that came out like a charm I love it okay that is the hinge point and that's still plug the living daylights out of me I might have to work that out of here somehow anyway there you go focus on this side for now that file gap technique worked like a charm love it see you thanks for watching you

Channel: Joe Pieczynski

Views: 120,132

Rating: 4.8961592 out of 5

Keywords: Joe Pie, JoePieczynski, Advanced Innovations, advanced innovations llc, how to, machine shop, shop tricks, shop hacks, shop techniques, shop tutorials, broaching, brass scale models, trunion straps, miniature cannon models, hand filing, Diresta, Ave, Furze, abom, advanced machining, watch makers, precision machining

Id: VUcA65xF1_0

Length: 22min 47sec (1367 seconds)

Published: Thu Apr 23 2020