BOLTR: Air Compressor Explained and Fixed.

gentlemen welcome back to the shop we have here a critical piece of shot gear down compress orb down I mean for safety sake I've been learning Australian I think I got it right but I tagged it out so that no one would use it of course I'm the only guy in the shop but you know sometimes you have a little we dram of the pure you know what I'm saying shaky shaky hands off sneaky okay now we just got to let the Sullivan flash off and away we [Music] go why are you so long time we got a bad case of the crack split right half into uh straight around the bung and into the meat right in here runs right along and up would probably end somewhere around here what we'd oh God what would you do I was going to pull this out and weld it and then I thought better of that because welding pressure vessels is dangerous and two this thing uses oil to lubricate it so guaranteed there's going to be some oil in here what we have is a bomb so if you needed to fix this you were in a thir War country you didn't care about life for limb killing other people killing yourself you could fix this absolutely you could what you do is you would consider that this has some oil in it so you'd have to fill it full of water then you get hydrogen emment or you put fill it full of in gas from your welder grind this out weld it up hope for the best this a pressure vessel though we do not [ __ ] with pressure vessels now while it's down for repairs it be a good time to maintain it service it it's due for its quarter Century uh bit of attention so we will change the oil now of course it' be a good time to pull the head off deglaze the cylinders no no no no no no the prime directive when it comes to Machinery cars anything if it ain't broke don't fix it you do the maintenance but you don't go digging and making yourself more problems but what I'm going to do I'm going to take out this pressure switch going to take out that fitting and then we're going to weld this to that and then we'll go ahead and cut the tack the little welds there and pull this right off as a unit and then Plum it into Yonder receptacle now if you'll indulge me I'll give you the quick and dirty of how one of these reciprocating compressors works just the tip mind you might find you like it it's called a reciprocating compressor because there is a reciprocating piston in here this is essentially an engine a two-stroke engine we'll get to that here's the control system here's the motor and there is the power transmission now it starts off you get your poking bit and you stick it in the poken bit receptacle singlephase household voltage comes into here into your contactor SL pressure switch and see here when we flip the switch it pushes down on this makes contact gives power to the motor this is a singlephase induction motor if you just gave this voltage out of the wall it would not turn it would hum it has a start winding and a run winding and they're 90° separated from each other but the voltage going into them is not 90° separated from each other remember it's AC so it's sinus soidal so what we need to do is we need one the start winding to have the wave on a certain spot and then we need the Run winding to have the wave on a different spot so they're electrically separated by 90° how do we achieve that in the start winding we send it through a capacitor that changes the phase angle so it separates that AC going in it retards one or advances the other then once the thing is actually turning we turn off the start winding so this capacitor only runs for a little bit while it's starting up and then once it's up to speed there's a centrifical switch that senses it's up to speed disconnects this winding then it's just running on this capacitor and the Run winding this capacitor is just for power factor correction so that um your voltage Curve Your voltage sign soidal and your current sinusoidal don't get too far apart because that's the power company doesn't like that essentially okay so that drives a pulley over to a fan and a flywheel that flywheel helps helps uh smooth out the reciprocal motion so there'll be a crank in here that converts the rotary motion into reciprocating motion a piston up and down air goes in there's no valves like in an engine they're little tiny poppet valves looks like U dimes little pennies and essentially when it pulls in it seats this one and sucks in from here when it pushes out it seats this one and pushes into the tank and that's how we compress the air how do we prevent air from back feeding into this there is a check valve a one-way check valve so it can only go in and then there's a sense line that comes over here here uh bar bars against or forces against these Springs and once it overcomes the spring tension it detes this so This opens up so once you're at pressure this opens up your motor doesn't turn anymore and that's pretty much all there is to it so you adjust how much pressure you want in the tank by the preload on the spring and then if you go over pressure this is a Rel Rel valve a poppet relief valve so you never build up too much pressure in here in case this goes wonky that's really all there is to it this is Splash lubricated and this of course the head especially gets hot cuz you're taking a column of air and compressing it the heat that was in this column is now in this tiny little column heats up the air basically you need good air flow and there is a fan you want these things to last if you're giving her a hot supper put an external fan on them that's really all there is to it uh some air filtration keep the nuggets out and it's in there oh it's still spotless look at that nice and clean in the shop 25 years look at this piece of junk went to take that little screw off this the first time the initial run for a shame bought this uh in Ireland figured she'd be a Skookum choer n capacitor interesting no PCB contained adjustable combustible fluid Arrow box so this must be the start capacitor because we have the input here and then both windings so a winding over here and a winding over on this side and then this is just the the power conditioning capacitor for power factor correction on the regular winding so if you ever got a problem with your compressor here is the first place uh tripping the breaker of course it's the first place and then these crap out and then the centrifical switch on here crops out quite a bit of course we have a belt power transmission so if you hear squealing chances are that's it oh the other thing that could go wrong of course is these could dry out and blow up you would see if they blew up but if if if you're susp expecting them and you're not sure there is a way to test it we get out our digital multimeter put it on ohm scale we'll stick it on across the leads 5 ohms so that's the yeah resistance got 120 volts uh that'll give us 25 amps in Rush name plate is 15 amps so we're right in the ballpark we're not out to lunch if this was like 1 ohm You' be questioning if there's something wrong with this or if it's like 200 ohms you know you got a problem with the windings also if it's grounded which it is what the f oh ah these two we touching okay we'll keep those from touching and then we'll try it again there we go woo so we have no continuity between phase and ground which is a good thing now what we do is we put it on farads and we have to disconnect it now and we'll put it on farads and see how many microfarads it it has and this one has 213 microfarads and the bigger one has 29 oh wow 29 far fewer I might have gotten those mixed up although if this is more Skookum this would be cuz the start capacitor is only on temporarily so the run capacitor actually has to be more Skookum I might have got those wrong this is the overload for the motor overload protection directly on the motor so this will pop out if the motor gets overloaded but generally the breaker pops way before this anyway I don't think I've ever reset that I clearly never had a problem that I can remember with it I we'll get over here I got the guard off looking at the belt it's in fine shape no chunks no glazing no cracks pulley are all on and not fretting what you want to do is just give everything a good solid reef and have a smell have a look make sure yeah good tension one of the things about the fractional horsepower belts is they don't need to be singing tight right on this thing's a beauty here's the oneway check valve back flow preventor Teflon bushing in there and you can see daylight so when there's pressure on this end it forces that up against and seats it prevents back flow back into the cylinder and now we are just about ready to tack weld all this together so that we can cut this and we maintain our orientation we got some scabby stuff there and some so we're not going to go with the 718 low hydrogen we'll do the farmer Rod mud Rod 6011 330 seconds it's 3 30 seconds around so how much amperage um A good rule of thumb is if you know the inches that's 90 thou 3 / 32 is 90,000 of an inch we start with 90 amps and we go from there it's the guys like the pipeliners you you see them and they'll be they'll have a helper right on the machine and and they'll be yelling at them up down up up and just as they go around and do their passes they want different heat levels for different positions it's real interesting it's quite quite a lot of art some artfulness involved no doubt in this case we will have zero artfulness just going to Gob in some weld there okay I forgot to hit the record sorry but you can see there there's a hole right there I show you how to recover recover from even the earliest hole now that's real thin gauge material so that's why but stick is a challenge so what we're going to do is we are going to fill that hole oh what we do is we apply some metal and then we pull away and let it cool down essentially tacking over and over and over and we're getting there almost there there we go that's it you see what I did there I was trying to put weld in here but I know that's too thin so I move it over here while this cools cuz this is a nice thick gaug of material and just let it cool here and then bring it over [ __ ] a little bit in there a little bit of heat and then bring it back back over that's how you fill a hole this is a artist grade mig weld old Indian trick here we're going to clean this up with some 7014 it's what's known as jet Rod it freezes real slow so it's not as as chunky you'll see and no one's the wiser Freedom horrible freedom I put all the paint out in the shed which seemed like a good idea at the time but did now I got to breid the wolves in the snow and she's Frozen [ __ ] stiff so got to wait to paint this but what we got to do is we got to adapt this into the tank and the tank is all bsp fittings British um with bonded seal Rings now this is hot so we can't just use a hose we have to use the copper tubing so we get a feral U compression fitting to some sort of jic hydraulic fitting yeah I got to see what I can fabric here in the shop but if not I might need to pause here and rush out and go get some stuff before before the getting spot closes so this is the thing that goes in the thing that goes in the thing so here we have the feral compression fitting that appears to be/ in npt and we just got a little nylon uh what do they call that quick connect fitting let's have a look here in the junk drawer see what we can find maybe uh oh let's this will all be there's no way oh yeah that'll fit and what's that that is 38 okay so 3/8 national pipe two uh get some hydraulical fittings here we are going to need a jic to come off of that thing so joint International committee -8 there we go to a half inch national pipe thread now we need a bush everybody needs a bush there we go oh my God it's never that easy ever we got the Dingus end here and we need the slight curve to the left on the head now this is a compression fitting I haven't gone over these before but essentially well they they work on compression they seal on compression here's the nut inside there that ring that's the feral and this goes in like so it's easier to do when you're not single-handed in the dark and and when when this tightens down it compresses that ring around the pipe and that's what SEALs it okay here's the mock up bit of a Rat's Nest but good enough for the girls I go out with to temporarily test it plug it in see if she chooes wasn't expecting that just to go lots of leaks right hor we'll disassemble this take care of the leak slap some paint on her stick her onto the bench forget about it for the next quarter Century thanks for watching keep your [ __ ] ofce

Channel: AvE

Views: 637,723

Keywords: air compressor, tool, review, test, experiment, engineering, welding, mechanical, electrical, motor, capacitor, electronics, plumbing, workshop, woodworking, metalworking, construction

Id: Y_lHOpqwDI4

Length: 17min 41sec (1061 seconds)

Published: Sun Feb 05 2017