BOLTR: Does HILTI hold up to the hype? SDS Rotary Hammer.

gentlemen welcome back to the shop I clap my hands back flip out of bed today is the day they write deadly killing machine healthy te6 a I got a feeling that this is going to be a Skookum tutor but we won’t know until we take it a part and I’ve been walking past this thing at a brisk pace with my file folder in hand for the past month kind of avoiding taking it apart but now I cleaned off the slate and I done pissed off my wife couldn’t proper so I am NOT going to be a problem Ian here in the doghouse all day I think it was Oscar Wilde that said women are meant to be loved not understood and apparently saying a piece of clothing that she’s honestly asked your honest opinion on if you say that it looks frumpy or vaguely mom like there is no worse insult on the entire planet lesson learned this is a 36 volt lithium ion 2.4 ampere-hours at 36 volts that’s a lot of power and then the it’s got a neat little feature here you just push the buttons I don’t know if it’s both sides no it’s just the one side oh wow there’s a switch on both sides overkill already well goes to show you a shoe the prime directive at your peril the prime directive of course being if it ain’t broke don’t fix it so I split this apart and before I even had the back cover off there was some incandescent going on here these lipo battery lithium ion batteries they got a lot of jam and they’re torquey and these little tiny sense lines I guess I pulled on their own one or something together but it won’t come apart and there’s silastic all over the place so just not meant to come apart don’t ruin der but interestingly these are made in Germany by bmz and they don’t have 1967 t-cells which of course are just 18 650s that are actually protected that’s the proper designation for a teen 650s that are protected it’s 19 670 these are not them they’re essentially C size in the radial direction but they’re a little longer in the axial direction and they’re 25 5 hundredths very torquey lithium-ion batteries if you got one of these do not take the battery apart no user serviceable parts inside and I’ve done hopefully I can get this back together but bit of a repair work to repair the repair so I would need to split this right half into in order to pry off the silastic and all that hassle so we’re just going to leave well enough alone big Skookum battery as you can see we’ll try and get her back together but on with the show and now I’m all gun-shy I don’t even really want to touch this in case explodes in my face I got my safety my glasses on just on call and there you can see it looks like some sort of balance board and display like look at all the lines going to it I see some things I like already and just taking off this holder and depth stop and this is actually it’s not even urethane it’s actually proper vulcanized rubber quite soft just like the jacket of a trailing cable or something a pricey part if you’ve got a mold out and pressure vulcanizer and then the switch is pretty mushy there’s no kachunk kachunk at the end of stroke to give it full power we’ll have a look at that see I’ve just taken off the SDS Chuck so we can get at the n-words look at us interesting a cos elated OD snap ring it’s not thick enough to be heavy duty but like a proper heavy duty designated snap ring it’s just retaining this little tiny preload spring for the Chuck yeah I’ve never seen one of those must be especially for this application and because this is a quality tool they trace all the castings here we have polyacrylate 6 and 35 so if i’m not mistaken and i have been mistaken before on these plastics because i’m it’s really not my forte i think that that means 35 percent glass fiber reinforced i just got to put some tape on here because i after i bought this at auction i put my name on it i don’t want any teenage fanboys showing up on my door thank you very much and by teenage fanboy I mean Demi canal English Bob and dr. Portland holy we’re gonna have some spring of my thongs going on here I can already see the gears holy oh my god what have I done Oh daddy so bad there’s a cute little custom buna and o-ring look at that just like on a gear pump so this is

interesting you got to pry this apart it doesn’t clamshell apart because there’s no way no joint there at the top holy look at this thing like some sort of rocket ship ion thruster gearbox zero cheap-ass going on with this thing holy look at this look at this see what that is it’s a gearbox breather so when the gearbox gets hot it doesn’t pressurize incredible I thought that was interesting on the makita hypoid saw that they actually had a pressure accumulator Boop like a void there with a sealed boot that would allow the pressure to change with a blowing of the seals and still keep the dust out this is something else oh it’s actually got up yeah filter element in there the housing is just plastic here this may be magnesium it doesn’t have the look of aluminum really it’s got it’s a little bit grayer darker gray than a typical aluminum casting there is an easy way to find out whether it’s magnesium or aluminium or some other um no tane IAM sort of liechtenstein ii and stuff I gotta say this thing good it’s actually intimidating like it’s just so far beyond uh oh yeah I don’t know if yeah this thing scares me I hope it didn’t make a mistake by taking it apart and I’m kind of at the stage where I’m like my spider sense is tingling of course it doesn’t inspire very much confidence when you the first thing you take apart the battery just about blows up in your face right fool for the job am I wrong well there you have a flame test that’s clearly some sort of space-age billet aerospace grade aluminum so here we can see the two bull gears this guy runs the rotation uh-huh and this guy runs the impact obviously a pneumatic impact the same as the IKEA almost SDS drill that tries so hard to choose but ends up just making fart noises let’s have a look at this little bull gear she is just a beautiful specimen check that out a lot of thought went into this there’s a chamfer here to get the key in look at a nice champ for your there though Bohr is just mirror finish sorry focus now the question is is this powder metallurgy seeing as how this is the highest quality power tool I’ve ever seen we’re going to have a look and see what the big boys do to get out the microscope here a first glance I’m going to say it’s powder but then there’s some interesting details here we’ve got to have a look at it and the reason I say it’s powder is because there’s all these draft angles here which would make it easier to get out of the press mold right so this is interesting this is the shoulder here and we can see it’s pretty rough but then either side of that is the towards the top of the screen there that’s the champ here for the shaft and it’s ground obviously and then machine turn lathe turned on the outside diameter alright so here’s the gear teeth you see how sharp they are so they must have been machined after hardening and so likely these weren’t powder metal gears let’s have a look at the tooth itself so there’s the crown of the gear they’re real nice that’s been ground that’s not a powder metal gear I’m sure it’s hard as a coffin nail we’ll just confirm that with the the file there there you have it the super high-end tool not using powdered metal gears so what’s that tell you maybe powder metal gears are a good way for nice to put out a product that’s a little bit cheaper depending on the price point of the tool of course and to corporations don’t you kid yourself there there’s like any corporation they’re in it to make money that’s the only reason for their existence so the only reason they are going to change a design is to make more money for seda will to go ahead and use powder metal gears it’s got to be a reason for it reason seems to me like it’s cheaper I mean there’s no comparison the the will grinder gear looks like the surface of the Moon and look at this one it’s beautiful you can see that the hobbing marks on this gear and then it’s been

ground after the fact so very nice so you can see the chamfer on the shaft ID there are the bore ID rather so here we have the keyway it’s obviously been broached look at this I would have said the chamfer on the keyway was hand file because look at the corner there the difference in the corner but actually you can see the radial grinding marks on there so that’s somebody came in there after the fact with the hand die grinder and and knocked that edge off in order for that gear to get installed easier on the keyway nice little detail spared no expense now we’re going to have a look at that grease thick gray pasty grease looks for all the world like molybdenum disulphide and a real thin moly disulfide if it is so there we have it there I’m zoomed in as much as I can barely see any gray particles more than likely this is just a straight ep2 moly soap with some tiny little amount of molybdenum disulphide solids but nothing to write home about this is cool out of this Chuck rotation shaft here it took what I felt was a Woodruff key what I thought was going to be a Woodruff key Oh turns out it’s just a plain old soft square key I said interesting we’re going to pull the microscope out again I’m going to show you something so there’s the surface of the key you can tell it’s a real soft material looks like the surface of the Moon but look at that that’s where it’s been fretting in the shaft so it’s sliding up and down in that shaft because it’s not fit perfectly and you can see it’s rounded right over yeah towards the right-hand side of your screen you see where it’s it’s plastically deformed right over and there’s a Chowdhury edge and then there’s a perfect line there where it’s actually cutting into the keyway that’s right on the pinion pinion feeds that bull gear so there really wouldn’t be all that much torque on it but just from the vibration of the hammer mechanism I guess it would fret on there and you can see all the displaced metal but that’s the nature of keys they’re always softer than the shaft material always softer than the gear you don’t get that same kind of fretting on a Woodruff key because it’s located axially and it has nowhere to to shake around to a little bit stalled out here I suppose I could get the stack up online but that would be kind of like cheating just being careful with this double lip seal here boon n double lip seal on the output going to try it because I can’t get this out I figure if I can get this seal out there probably be a retaining ring in here and maybe be able to pull the whole assembly out thus wise and then be able to get this oh yeah it’s coming out good normally what I do is get a slide hammer drill a hole the little screw slide hammer it out I don’t have another one of these seals and I don’t feel like calling the bearing supply place because they’re not too happy about so I’m calling up an order in one seal you know I’m saying there we go holdin tea bag look at this Eve the bore for the future sing hammer Steiff and inducing this is all precision ground not gwangsu precision ground mind you but chairman e precision ground she’s a Skookum future look at this the wily Teutonic buggers just like an onion you keep peeling layers back till all this left is tears check this out they got a clutch mechanism in there and it’s biased so it won’t hit as hard in Reverse I guess look at this you see that so it locks going forwards and back ways it would clip up over there’s a preload spring on there ain’t that a stink hey remember how on the IKEA SDS drill the hammer mechanism the dog actually engaged like a quarter of a blonde one look at that meat on that cork stuffer see the way this works is when you want hammer this this brings it up and engages this big beefy dog here and then when you just want drill seen mate’ll it pushes this down and disengages the dogs I’m not sure I like this plastic lever but it is quite stiff and it hasn’t been broken yet I’m not the first owner of this of course I bought this at auction so who knows what three hundred pound gorillas were on it before this two hundred pound gorilla got on it and this never got broken so what the hell are so this is the selector cam for the hammer versus straight drill and of course it’s just a plastic piece of crap I think they do this on purpose to make sure that the part of the drill that breaks is what the 300-pound gorilla is reef and on I guess if you can’t get it to engage you put the six-foot snipe on there you’re just going to shear this off and then you got nobody to blame but yourself right whereas if potentially if this were steel or something you might break something else so I assume that this is an engineered weak link right let’s take a break kind of give you a brief

intermission we’ll be back after you here’s the key in the hammer shaft hammering transfer shaft and it’s a key as well not a Woodruff key but just a straight key but you can see it’s properly fitted to the slot here it’s got rounded edges and although it has fretted a little bit it’s not nearly to the extent that the the one with the square edges that’s because it fits right in that slot nicely and doesn’t have as much room that’s just the square one rattle around so that’s odd to me that they would go with on one on the one side they would go with a proper rounded and key and then on the other side they just go with a square cut filed key out it may be the purchasing department figure they could shave a half a penny off each unit if they how the guy cut it in the shop himself weird right I mean you find that in everything no consistency one guy does one way in the guy across the cubicle from them does it another way just it is what it is okay we got the hammer and impact shaft out and we got the the cylinder here it provides the impetus it compresses this is a pneumatic of course so as it touches forward to pressured Rises the fluid in here the fluid happens to be here and that’s what gives the little hammer its rappy rappy top action interestingly enough though shockingly actually it’s got this wrist pin no ankle no what the is is called I’m losing it cone rod connecting rod Jesus one eight four three six five seven to best engine ever made but yeah this is plastic plastique pa6 CF twenty polyacrylate six and then it’s got 20 percent glass fiber in there if I’m not mistaken it cast weak weak O two of 2001 well we got an oldie but a goodie here I don’t know I don’t know of course I guess this way it doesn’t need a bearing at all because it just just where’s the connecting rod right anyway yeah plastic thumbs down so let’s through me for a second because all of these bearings have bb1 and then the actual number as BB one is a SKF actually and the B designates the something speciality and the B one or the b-17 or whatever says if there’s any special conditions this is not this is just a typical deep groove ball bearing cut the metal cage on there at SKF fit finish is perfect and just quickly if you’re ever changing a bearing or you suspect the bearing just rolling it after you clean out the the GUP just rolling it like this is not going to help you find any troubles you actually got to put it under load and turn it and then you can feel if there’s any chewy spots a lot of times if you just spin it like this you’re not going to pick up the actual problem spots you got to put it under some axial or radial loading and then turn it now of course all these bearings are absolutely perfect pornographically beautiful look at this thing there’s the Martello or marty’ll and we can see they Center less ground this there’s no divot in there to collect oil and and crap and then over pressurize on you actually hammer this thing is a killing machine I mentioned earlier about heavy duty snap rings look at this duckbill snap ring this is a standard transmission type where there’s no holes you need the duckbills to get in there look at the thickness of that that’s obviously for stiffened making sure this preload spring is nice and stiff there’s got to be something to do with the hammer mechanism for the recoil engineers and this brings up an interesting point engineers and designers all work with different constraints one of those

constraints always is cost of course but in the higher end things of the market it’s probably quite a bit easier to design a very robust tool than in the mid-range of the market I’m going to pull out diagram and show you why so this right here is the reverse bathtub and it’s the hardest criteria to design for especially if you’re very constrained by cost like say for instance Milwaukee or des wilt why that tools going to have to cost you about 10 to 15% of your cell price of course you got to ship it you got to pay for advertising you’re going to pay the salesman you know say on $100 tool you got to be able to make that for like 10 bucks all in and not only that you want to hit this timeline target you don’t want any crib deaths over here you want very few units to crop out during the warranty period you want the vast majority of the unit’s to crop out after the warranty period but you also don’t want them to last forever over here because then if they last forever you can’t sell anything more you can’t sell any more tools in two three four years so it’s very difficult for a designer to predict how long something is going to last because how easy is it to predict an average user what’s impossible there are no average user search guys and you stuff steady every day and beat on them and then there’s there’s old ladies that never use the thing right now if you’re Harbor Freight or princess auto you don’t care how long it lasts you just want it for a cheap cheap cheap price so you’re going to be more like this lots of crib deaths and very few that last a long time which is what we saw when we took apart both those tools I got from horrible Freight actually from Princess Otto they were both crib deaths in here quite easy to design for because you don’t give a how long they last you just need them on the shelf you’re only worried about money that’s it and then over here you have the hill tease the fins and the metabones and all that good stuff what’s the other one Festool where you can have any crib deaths and it lasts a long long long long time before you start actually getting into the failures so you don’t have to worry about hitting this window you just have to beat one side you’re not constrained you can have this thing because you charge 1,200 bucks for the thing you can have this lasts forever and you’re happy of course you’re still constrained by cost but not nearly as much as either of these two manufacturers interesting anecdote that I heard recently was that festival at one time was trying to build a cheaper brand to sort of hit this DeWitt no target here and they gave up they couldn’t do it too hard I couldn’t make money doing it so that goes to show that the guys that are designing extremely good tools aren’t necessarily I was going to say aren’t necessarily a sharp but that’s completely wrong I would say that the guys designing super high-end tools have it a lot easier than the guys trying to hit this window right here I was just having a look at this grind here every ground surface is just beautiful here’s a bearing race I mean doesn’t get much better than that look at this it’s pretty close to the same and while I was looking at that I noticed that this heavy preload spring isn’t for the recoil at all it’s actually a torque limiting clutch here’s the crown gear what for turning the drill bit clear the whole of cuttings and if it gets bound up you see here this can push the sways and this will spin clear you see how these dogs are champ feared or tapered they’re interesting that’ll save the gear teeth from getting destroyed very smart or not is a heavy heavy preload I’m really impressed by how much more Skookum where the machining is on this Hilty than anything else we’ve taken apart it really warrants a goodly look at it dog bless those Germans to start off we’re going to have a look at the quality of this bearing race the surface finish now you incensed 20 year-old white men that are living in your mom’s basement just relax it’s not a racist comment they actually do call bearing races races there’s the finish on the inner race there that would be what they call super finished and you can tell it’s been ground so that would run likely around 8 micro inches 0.2 micrometers

beautiful and we’ll have a look at the OD of the bearing of course this just sits in a housing but it’s still beautifully finished just ground in the one direction you can see the pattern but just beautiful surface finish and not only are we being a little racist today with the bearing races check that out f AG bearing horror of Horrors and of course in Deutsch fabric werkes Alice Farkas Lawson dummkopf and that’s the finish on the shaft itself looks just like the OD of the bearing race beautiful beautiful if I had to guess I’d be able 15 micro inches re now I don’t know what that would be in 30 metric corks sniffer maybe like point for something like that I mean really who can keep track of all that stuff how many Kings feet to the cubit I will say this about the whole ongoing metric Imperial debate here what about the English like they don’t even have metric money what the is a Guinea how many pennies to the pound how many pence in a Guinea in a pound how many troy ounces sterling silver in a cup of tea no really inquiring minds need to know well thanks a lot for watching we’re going to continue in part two on the electrical side we’ll do the motor and do some testing see if I can get this thing back together it’s not a foregone conclusion it never is thanks a lot for watching keep your stick on the ice