Leitz Optical Dividing Head Teardown P2

[Music] welcome back to ox tools i'm tom so this is part two of the uh the lights optical dividing head instrument necropsy so uh we're disassembling this thing uh it got submerged in water at some point and a restoration is pretty unrealistic for this unless you have unlimited money and unlimited time and then what are you going to use it for in the end it has kind of limited application some folks asked about what it's good for and it's really an inspection tool for inspecting gears sprockets things like that with circular divisions on them so you would use a microscope and then index them and then check the the quality of the indexing on the actual machine part i think there was an optional bench that these came with that that mounted to and the tail stock and some other stuff in fact another uh a viewer sent me a picture of his he has one that's set up that way so kind of cool and you'll notice i pronounced uh uh lights better uh this time all our german viewers were quick to jump on the bandwagon and correct me on that so that's fine no problem um so let's uh continue on with our bosonic activities out there and get the rest of this thing taken apart and see what the innards look like it's pretty cool okay so we've got some so these are kind of interesting here um what i think this is and we're going to try it here is this this plate here is held on with some dowel pins actually those are threaded you know what i need to look at this a little closer um but they're kind of a weird nut this one i cracked loose here it's a weird nut but it's threaded down the center so what i think my belief is that you you put a screw in from the top and you use that to help uh no that doesn't make any sense to push it off no that doesn't make any sense at all mr wizard that's all that's backwards you know what that doesn't forget it forget i said that this one here okay it's tighter so something's mounted on the inside there so yeah i put a little little liquid love on there and uh making the sound that i'm that it's solid okay so this whole thing moves right let's see let's double check that i think this whole yeah this whole mess turns here with the uh with that axis you know what what the heck's going on here that the reason it sounds so solid part of the casting i don't see a seam in there okay i gotta i gotta eyeball this a little bit and see what uh what's going on all right this thing's pretty cool here it's worth showing here so what we got going on here this is kind of neat um i noticed these two screws here so i said oh wait something's attached on the inside and what's attached on the inside is this this bracket right here but this is separate from that and what this little chingadaira is here is basically this tube holds some optics and you can see a lens element or a prism there in the end but when they're calibrating this thing there this tube is cantilevered from the opposite side right so they have to they have to basically align the end of that tube and push it around right and so what they've done here is this little screw here in fact i'll deflect it you can see it watch the tube move see that okay and then these and it's very hard to see um let's see if i can shine a light in there and you can see it there's a little pointed element right there okay yeah you can see it there and these screws uh will will push it one way or the other right so this way this way and this way right so they they can control the attitude or the the alignment of that uh the end of that tube now to to remove this plate here i really need to back these adjustments off here so i don't destroy them and it took a little bit to get it free and i rub the fingerprints off my fingers on these knurls here doing it okay and then we'll just get that so now those little points are retracted up here and then this drive screw is is retracted now so we'll pull this uh this cover element off here and now it actually makes more sense how the thing goes together so which is kind of cool uh so let's uh i got to use a slide hammer to to get this to move because there's a lot of corrosion in there so there's some kind of uh animalistic activities coming up here well this is starting to get good here my slide hammer didn't work it's it's moving a little bit but i suspect there's some dowel pins locating this to that uh that are giving me some trouble here so what job wouldn't be perfect without a tool to take something apart so what i'm making here is a puller is a puller to uh to help remove that and uh alrighty and then let me get set up here and then we're going to give it a give it a try here so this is the spot that's been uh stubborn down here and this is with the bottom where there was a lot of corrosion there it goes yep okay come on buddy there it goes all right nice so you know how much fun you're having it's proportional to uh directly proportional to how many tools you have out of your toolbox so the more fun you're having the uh so there's that tube that i was showing you earlier you know so it fits in there loose but they got to secure the end so but you can see all the corrosion here and it looks like there was a uh indeed a uh yep a pesky dowel pin that was giving me some trouble down there so and then this guy here this is let's see if i can pluck that out of there for you this is the clamping ring here that clamps around and locks the rotation so that's a nice little piece there and they just feed it into that slot like so right that's uh pretty slick slick design there it's kind of like a snap ring you know okay well we're we're into the meat now all right so there's the uh the guts of this thing let's see if i can turn this did i put the brake on oh yeah i put the brake on mr mr wizard well oh okay the worm's engaged that's why you can't turn it so there's the spindle um and this is the uh graduated uh or the optical disc that that this assembly looks at here i'm just gonna drop this in so you get some idea of what uh so when this thing's in here his dell pencil lined up there we go so it light comes through the disc um and is looking at um markings on this disc on both sides of it so um that's how that that setup works there um and as you see it's in pretty it's in pretty bad shape there pull this out here again and see there there's the deal it's it's looking at both sides of the disc and i don't know if you can see it but the holes that it's looking through are pretty small so there's little prisms uh down in the bottom to this that light comes through and then the prism picks up the image and brings it back up to the eyepiece so pretty pretty gnarly i think we're ready to to really go after this spindle thing here but to get it looks like it all comes out the big end here um but we got to clear away some of this uh this brake mechanism so i think we're gonna flip it over and work on the opposite side and take the knobs off and that cover plate off and then we can work on getting the spindle out of there we're gonna go after this uh our cute knob here see if we can get that out of there okay we're off to a good start there it's kind of clever how they did that spring there this is one of the fun things about this this kind of stuff here that's pretty tight is studying the design elements of of you know how some of the stuff's put together you know as a as a mechanical designer myself it's there's so much to be learned from what's already been done and that you can just reuse and repackage for your own sinister uses so so basically they got a flat spring there that's attached with a small screw into a step but that's what's providing the the reset force for for that and it's just nice and smooth and uh and feels pretty good and it's very simple doesn't require a a a torsion spring or anything weird that takes up a lot of space it's a very compact design so there's a better shot of that so there's the spring right there let's see if we can pop that off real that's screwed up you know a lot of these screws are uh they're kind of an odd size uh the uh for the diameter of the screw the slit size is uh is kind of weird so there's the there's a spring i was harping about there yeah pretty simple pretty simple setup there okay all right let's see what's next here this is always cool you get to try out uh these are uh my i haven't used these yet these are metric drive pin punches made by pb swiss which is a well clearly a swiss company that looks right the right one yeah okay look at these things it's got a rubber grip drive spot anti-roll little feature just pretty sweet so what we got is we have a it looks like a taper pin holding this on tapered and i think it's just a straight straight pin now hopefully this will just come right off no of course not all right sort that out so everything's loose here but uh not cooperating of course maybe we can okay that's how we do that okay that's working okay okay pushing bearing sleep bearing collar another collar okay look at that oh left hand threads huh there's the knob the super knob that's pretty cool okay okay all right i'm just gonna bet that this thing is just clamped in here it's pretty typical for this kind of a thing oh is there one on the bottom come on yep yeah i think they're in little divots too all right i gotta get it this there's one at the bottom i gotta get at so uh i need a little shorty uh screwdriver like that or something i want to pull this there's that that's that optical tube assembly i want to just pull that out of there then we're going to remove this um this this cover plate here get a few of these here where they've kind of puttied over the top oops [Applause] okay [Applause] okay okay a spanner ah that's interesting [Music] i don't know if those are all right well let's uh get that off let's get this kind of threaded hole down the middle under what that's for all right well let's see if we can get this this hand wheel off i need to get access up here so i think i got to work on this a little bit those those are some fine threads in that interesting let's see if that's i think we gotta give that a little a little love tap there moving around let's tip to that let's do this maybe it's okay i'm still turning relative to that let's see if i can dink that around i think that moved relative to the uh the shaft is what i'm looking at there needed a little inertia there okay second lock ring now what geez yet another one look at that but this one looks like it's got pressure screws here to um let's see what is that a little screwdriver two of course that doesn't fit this thing's got a lot of different sizes on it so i think what these are these are to do the final tightening of this so that it doesn't disturb the uh the rotational position oops excuse me yeah uh looks like they went in to smooth some little divots there yeah interesting okay all righty then are we getting any closer oh yeah something's moving here something's moving finally okay so what i think needs to happen next is this worm this worm here this real fine adjust here that does this right needs to come out it needs to back out of this um to disengage this so that it can come off interesting a little cone point set screw i can't get it that one there's one back in there oh okay i guess i don't need that one oh that's interesting look at that little little deal there oh wow that's a pivot cool oh okay so [Music] all right there's our set screw right what's going on there why does it have that oh you know what you know what i bet's going on i bet you this is an adjustment screw that pushes against let's see here oh yeah so there's a little bushing in that so what they can do is they can take the backlash out of the worm right so it's pivoting here and then this screw pushes on that bushing and pushes this into engagement with the uh with the worm gear so this is the worm screw and this is the worm gear so they can push it into engagement and take out all the backlash or take out whatever backlash they want to take out so that's why that's pivoting actually that's it so that's a good rotary table design right there too so you know if you want to build your own rotary table this is actually a good provision to be able to disengage the worm and then put it back in and take out all the uh all the backlash basically in the hand wheel so if you're gonna build a little rotary table that would be the way to do that so okay so now yep okay so this is coming out now there should be a nice nice worm wheel there and in fact if this wanted to get repurposed into a small um little rotary table there you got all basically all the ingredients right there i'd have to count the teeth and see what it is but my guess is it's uh it's adequate for that kind of a thing and we got some some little preloading springs here so that it has the right feel the right amount of drag um on the hand wheel i think it's got some weight to it too pretty cool all right nicely done all right let me look at this next bit here i think we've we've found our first uh actual ball bearing here and what this is this is a thrust bearing here so when this whole uh hand wheel assembly is tightened up uh it's preloaded against this uh against the thrust bearing here so we're gonna take a look at that yeah crack these loose here okay so that's loose so let's uh lift this bearing okay so what's what's going on it's got an outer that's made out of aluminum there huh interesting so that appears to just be a retainer here okay so it's just yeah here we go so this is the you know when you're disassembling something like this this is the the thing you fear if you got to put it back together is uh is loose balls there we go okay so if i'm right these will be hard steel here yeah these are hardened and ground here you can see the grind marks on them still so that's a really simple thrust bearing there so two hard washers drop and uh two hard washers and an outer retainer with a bunch of small balls and there's the lower washer there let's see if we can get that thing to move yeah so not that you'd ever well i don't know you might have to make one if you had something that had a uh a peculiar space that you couldn't fit a kind of a stock bearing into and you had to create a custom bearing right let's see if we can lift that washer and make sure all right well i gotta it fits the id pretty closely so it's not one to come up all right well let me collect these balls and uh and uh that kind of sounds funny doesn't it okay oh aluminum casting nice compression spring there okay boy these guys spared no effort on this thing today okay yeah does that come out nope let's hold that on so that that's a cam there so it's got a ramp and that's what provides this tilt mechanism here remember i was saying the uh the worm wants to be uh um be able to tilt so you can take out the play wow what's holding that interesting it's a mystery so my guess is it's held down by this plate here let's just uh oh boy that's tight of the monkey's uncle there all right let's give it some some persuasion here that was easy yes rust on the end on the ends of the screws there so that got wet too okay oh here comes our here comes our worm assembly or the screw and then oh wow that's just sucked down to the plate it's a nice ground finish sitting on a ground finish well that thing looks okay see it's even they even shielded the thing with a uh [Music] with a tube they're interesting and you can see that this thing got seriously damp here or something at some point so all right let's set that aside let's get that that's just nice there so yeah there's a teeny bit of grease on that so that's sucked it right down to that okay now i can get at this screw all that to get at that screw oh that's tight okay i don't want to twist off the tip of that look how thin it is right i mean uh all right well let me see what else i got it'll get in there so i stood it up so that i could push on the end of this a little bit okay it's coming down it's just a real close fit and i suspect there's some oh there it goes i can see that there's crud on it okay that's that optical tube assembly there but you see that it's pretty sick so i mean sick is in not well and then there's that's the uh the little viewport that that light comes in and there's a prism system in there and uh you can see the end of that there there's a prism there um that's pretty occluded that's why you can't see anything in the uh in the uh actually let's we'll try taking that cover off and see what's underneath there okay well we're getting down to the down to the brass tacks here literally we're taking this cover off now and it's got these slotted screws here and i tried them i tried one of one of them with the this impact and it just started to booger the screw pretty rapidly and these are tighter to monkey's uncle now i got one out but i used this old school i don't know if you guys have ever seen one of these it's called a vessel impact driver so it's basically got a cam system inside it that and people from the old motorcycle days with the phillips screws in the side cases everybody pretty much had one of these to get those screws out and this bit fits real real close as i recall i didn't fit in that one i think i need to clean that one there let's see here well that slot's different isn't it okay well let's do the big one then all right this is a demo here so what you do is you pre-load it in the direction that that unwinds it and then you and what it does is it shocks it and it has a cam action that uh that twists it okay like that and then you can use something like this on it at that point okay yeah oh boy that's got a stink to it that oil there all right let's do another one just for fun here okay so insert preload okay all right be right back i figured out why these these there's two screws that are different um and i already cracked it loose i'll show you what's going on here so this is kind of odd so it's got a bushing right that's threaded and then i don't know if i'll shine a light down the hole there and you can see that there is a a fastener down there well what that is is it's actually a dowel pin that's holding all this together and what this is is is i believe is the extraction tool for that for that dowel pin so theoretically if i tighten this believe it or not then what that does is it um it's a taper pin and i think i just undid the taper pin there so if i my theory's right there'll be a pin on that yeah okay so you can see that pins tapered so that's just the extraction tool so what they do is they put the pin in and they they drive the pin down right and then they just put this on as a decorative cap right but it's also um sitting like that relative to the surface so you can push on the surface which extracts that pin a little bit i hope that makes sense so um all right let's do this lower one here it cooperated it's not too corroded i guess get that one out all right well it's loose anyway so oh there it goes all right same thing there yeah the taper pins are really good actually uh you know at final assembly uh because they assemble you know you drill a hole and you ream it you align everything and then you drill a hole then you taper ream it and then when you drive a taper pin down into that hole there's absolutely no play between any of the holes so um um so it takes out all looseness uh in in the system so it's actually a really effective way to uh to control location of uh of parts here yeah i'm not a lo i'm not a i have no illusion that this this plate's gonna come off like super easy here so i kind of surprised myself because i started tapping on it a little bit and it was actually moving so let's turn the camera on just in case it comes out easily so what this is here this is an electrical interlock here uh so that you can't turn the motor on uh when the when the thing's disengaged the worms disengage look at all this crud in here yeah this thing gets seriously wet so when this is in the unlocked position this makes contact and it's or let's see how does that work so all the way in was was tight right oh yeah which means that uh um it opens the contact here so all right anyway god this i know this thing weighs about 20 pounds here okay and then we got another slit sleeve here and now you can really kind of see the innards of this thing and see just how massive this casting is i mean this this thing still weighs 100 pounds easy right and uh um it's just massively built right it's a quite the tank [Music] you

Channel: oxtoolco

Views: 38,123

Rating: 4.9467888 out of 5

Keywords: Machine work, Toolmaking, Mechanical design, Leitz, Leica, dividing head, rotary table, metrology, Ernst Leitz, German engineering, theodolite, measuring angles, precision divisions

Id: 8mJ3DAPtZzo

Length: 38min 4sec (2284 seconds)

Published: Sun Sep 27 2020