hey guys time for another installment of our Johnny. Five robot build last time we made the tiptoe tube and some related parts now we're moving on to his rear caster wheel and a arm assemblies these articulate along with the track tip as you can see here in the animated CAD model this time we're just making the caster assembly we have some tapered roller bearings as well as a nice welded steel powder coated mainframe there and some stainless-steel sheet metal work and another big thanks to Terry at input Inc for hooking us up with these wheels as used in the movie I think he said they're off of a 's Cessna airplane and almost impossible to come by these days so he made sure that we got a couple out of his stash so that our robot could be that much more screen accurate starting off on the manual lathe making this aluminum piece which is called the bearing plug this is the part that holds the tapered roller bearings for the castor shaft once that's done I popped off the entire truck with the part still in it and moved it over to the slant to retain the. same setup concentricity with the three jaw here I'm showing how I like to set up the tool offsets on the slant I'll take a skim pass on the OD and face and for the x axis using blue sharpie or die comb so you can see right when that tool starts to
touch then measure the diameter and enter that for your X offset in path eyelet for Z I'll use a dowel pin as a feeler and creep towards the chuck in order to minimize any backlash error until I feel it just start to catch on the tip of that dowel pin and then at that point I know that my Z offset is the diameter of the dowel pin always really happy with how well this machine holds tolerance once it's set up like this you easily get parts of in a thou usually better now that all of the laid work is done on this part we need to go over to the mill and put in some holes at degrees around the part so again holding the part in my little three jaw Chuck that I've modified to be able to hold in a c collet so that I can mount that in a collet block and do the pseudo fourth axis kind of work here and the vise like we did when we were making Johnny fives tiptoe to brings card here if you haven't caught that one yet first boom boom of the day I proved my Z in the wrong spot should have gone off of that flange so this counter bore ended up being much deeper than it should have been but the part will still function as is so went ahead and carried on drilled it will still get plenty of thread engagement there as you can see on the good holes I'll always try to set my spot drill to the right height where it leaves a nice chamfer after the hole is drilled next we have a quarter-inch steel plate that connects the caster spindle to the caster axle hub so we're holding that using the super glue and tape trick card here for our video on that slotting that out using the lakeshore carbide fireplug rougher this is my first time using this tool and I really like the way it performed here [Applause] now back over to the manual lathe this steel tube piece will be welded to that plate we just made and retains the aluminum bearing plug that we started off with so first step turning the bore of that tube to size and then some blurry footage of me checking the size of that bore using these three-point and digital bore bikes I really love these they come in a set of four I think these are in size brand that we have then rough cutting the angle on the bottom on the bandsaw and putting it back in that three draw c set up to true up that angle on the mill and drill all of the corresponding bolt holes around the outside this short steel piece is the axial bearing hub and it will be pressed and welded inside of that hole we made in that quarter inch plate in the last major component we have to make is this tall aluminum upper spindle piece that retains the caster swivel shaft and mounts to the upper and lower a arms that work in conjunction with attractive assembly since this is a very simple part and I've been feeling a little more confident in my manually the skills lately I decided just to go ahead and make it entirely manually it's going pretty well until birds and I asked so from that point I changed up my feed direction to be away from the Chuck just so I don't have a big flinging mass of chips and also sped up my feed rate a little bit help break those chips up a little better had better chip control still a little bit of trouble at the end but it was manageable again I needed to be able to hold this part in my c block for indexing on the mill so I made up a quick and dirty aluminum tapered mandrel that I can drill into if I need to ended up being a hair loose so I neural bit a little bit to bring the OD back out worked really well a little bit too well got it stuck in there right good so this this actually ended up being the inspiration for our slide hammer widget that Jared design card here to that video if you haven't seen it yet and there's a fair amount of stainless steel sheet metal here to box around the outside of it and hold the this little fender guard so we cut all these pieces out on the plasma used laser-cut chipboard templates to mark out all of the Bend points and using all of the tools at our disposal much hammering and brute force managed to knock together a pretty decent looking sheet metal assembly for all of these tail end pieces more on this in the next video when we tackle the upper a-arm but all that's left for this caster is yet another assembly montage that's all for now we'll be doing this upper and lower a arm which again involve some aluminum and stainless sheetmetal work as well as some notched and welded tube for the lower a arm thanks for watching see you not any bloopers on this one that's sad you have some angular what are they called so he ma last time you saw us build this rear caster wheel ran off of there yeah which is the bottom most this holds the track tip this this contains the track and the entire track tick and can't say that word I lied about the bloopers we're gonna have plenty and the entire track and the entire trap I can't say it what is wrong with my brain pointy pointy stainless aluminum bearing touch thingies b-roll b-roll b-roll behold b-roll for your behold behold the
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