This video demonstrates precision machining techniques for manufacturing and repairing hydraulic cylinder components, including counterboring for socket head screws, creating metal-to-metal seals with thin lands, machining shoulders with precise depth control, grinding shafts with proper table positioning, and drilling hardened materials without pilot holes to prevent drill damage.
Deep Dive
Prerequisite Knowledge
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Deep Dive
Rammco Pallet Jack Cylinder 2Added:
So, what we're working on today is this uh um I'm calling it a seal carrier.
It's this little piece here. And um what its deal is is um it is um it holds the uh the seal on the end of this shaft here. So it screws into that and then uh pl makes a place for the seal to sit. Um cuz we're using a different seal. Anyway, uh this is a 1045 turn ground and polished. I had a little chunk of it, so uh it'll make a good uh good little thing.
So, for the, you know, like the 20th time, uh, the spindle bearings on this are shot. That's what the noise is coming from. It's not something else.
So, you guys can relax, all the people that are concerned out there. And, uh, it is a project that's on the books. I have the bearings. I'm kind of ready to go. It's just uh um I haven't got around to it yet.
So, if you feel like commenting on that, don't.
And if you do, that's fine, too. So, all right, that should be deep enough.
And then um what we're doing here, let's see, do I want to do that right now?
Uh yeah. So, what we're going to do is we're just going to counterbore in there uh for a socket head screw. And uh uh let's see here. Let me go get a socket head screw.
All right, let's get that in position.
And then I'm just going to use the uh uh the scale on the uh the tailtock uh spindle.
Heat.
Heat.
All right, that should be the uh the correct depth.
We'll stick that in there. Yep, just a tiny bit below the surface. That's what I want.
And then, um, think I'm going to go ahead while while I'm thinking about it, let's bust that edge.
Yeah.
All right.
Now, let's do a little uh do a little turning.
Okay.
So our major diameter is 900.
It's not a uh it's not a critical diameter.
Heat.
Heat.
Well, I don't like that finish.
Okay. Well, maybe I had to put one of those. Uh, looks like I got a couple thou left.
Okay. Um, maybe add a Oh, I got You know what? I got this finishing insert here. Let's try that one. See if it uh see if it helps.
Better.
Go a cow over the left. See if this helps.
Oh yeah, that's better.
It, you know, it probably doesn't matter, but it just bugs me. Uh it's uh got to finish, right?
Heat. Heat.
Heat.
Heat.
Oh boy, I just drilled that deep enough.
Actually, I like it when that happens.
Okay.
And now we're going to uh going to machine a little shoulder on this.
Um Um depth is 225.
Oh yeah, this tool works better.
100 200 20.
All right.
Take a quick measure on it.
797.
Actually, let's hit it with the micrometer.
Can I get it in there?
Yeah. Sometimes these uh digitals Yeah, this one's the sometimes the digital micrometers are a little fat. Um let's get a good old old school one here.
These are a little uh more sevelt.
All right. 798. Okay.
Now, what is our finish time? 760.
One more pass after this.
So, what do we got?
Five ninth out lift. Okay, I can do that.
Let's put a little love on there.
Nice finish.
shoulder.
Okay.
Theoretically that's it.
Yep. Okay.
Okay.
Um, and then I'm I'm going to put a little counterbore in here uh that leaves a little um a little thin land on the edge. And the idea behind that is I want it to bear on that outer edge only so that um it it forms a kind of a metaltometal seal there. Uh is the general idea. Um can I get in there?
No, can't get in there with that one.
So, actually, I could use this to do that. That land. That would work.
All right, let's go for it.
I'm going to go in 15 thou.
And I'm just going to bring this out so it leaves a little Oh, I can't see it.
A little thin land out there.
Little more.
Yeah. So, see that little thin land? So when I when I tighten that screw up, it's really gonna bear on that uh on that outer land.
So that's 15 thou deep. That should be plenty.
Uh I do want to break that edge there very gently.
Okay, I think that's the end of that part.
All right. So, here you'll get to see the the general idea behind this. So, um got to remember which way this goes. So, that goes like that.
So, that goes like that.
There we go.
And then that's the general the general consensus there.
There she is.
How does that feel?
Oh, I see. Okay. It's just There it is. Okay. there.
Anyway, that's the general idea. Wow, that seal is not symmetric, huh?
Interesting. I'm just talking to myself.
Sorry.
Um h uh the seal the way it's formed is uh one one wall is taller than the other and it's uh it's it's bothering my uh my uh sense of uh aesthetic. So all right anyway put that back in there.
It was so I had this soaking in oil to try to limber it up a little bit and it looks like it's absorbed some. So, um, okay. So, the next thing is this little shaft here. So, uh, this will be mildly interesting. Um, we've got our 124 thread here. Um, now this is chromeplated. I looked around to see if I could find some chromeplated uh rod in this diameter, but it's a goofy size.
It's 0.558, which is not a metric, not a real inch size. It's close to 9/16, but not that close. Um, and um, so we're going to make one. And I have some uh 174 PH uh H900, which is preh hardened, so it's already hard. and strong. And um so we're going to make one of these. We're going to turn the diameter and then um depending on how the diameter is going, uh we may grind that last uh uh grind the OD uh to get a really nice finish on that. So that's next.
Finish is good. There's some heat there, though.
I want to, you know, sometimes there's a interaction with the with the chip bundle that uh so you can't quite see what's going on.
That's a little better.
It's not wrapping around. So, uh, all that good.
It's trying to break.
Well, if we can get that kind of finish and uh there's no taper in it, then uh probably won't grind it. But we'll see.
Go a little bit past my mark.
Okay, looks pretty good.
And then uh need to monitor this as we go down.
68.
All right, we're getting set up over here. Um, and what I want to do now is I want to set the u the table position in relation to the uh the shaft center line. So, I got this little thing that uh that I use that uh kind of gives me a pointer that's straight down. And I want to be just slightly on this side of center.
That way u um it doesn't mark the shaft if I come back across it. And uh but I have a micrometer stop down below here.
So, you know, I just want to be visually uh visually uh on that side of the center there. All right. So, let me do and I'll I'll bring the camera down here so you can see the little stop because it's very it's good. Okay.
Okay. So, here's the stop and it's got a little micrometer adjust on it and it comes up to a uh a ceramic ball there.
So, I bring it up very gently and bring it up into light contact. Then I can lock the table and I'm assured that I'm in a the same spot um uh each time because it you want to be able to retract the uh the table so that you can take proper measurements on the shaft, but you got to be able to get back to uh where you were. That's the idea.
All right. So, let's uh let's dress the wheel here.
So, this is a um a 60 grit wheel.
All right.
And then uh let's get out of the way there. So, the last thing I got to do here before I forget is I want to u put some um some center lube on here. And we're going to use this uh Molly Coat P1042 cuz uh Uncle Robin and I were uh we're talking about this as center lube.
Get a few molecules in there.
I can't see it there. Okay. I don't want to Oh, yeah.
There she is.
Sounds good. Oh, wow. See how much it coasted?
It doesn't coast that much.
Okay. So, I think we're uh uh ready to uh grind here.
I'm going to come up very carefully against my stop and then come down like so.
And this little bit is a reduced diameter. So, I'm going to come over here.
I want to get a a touch off here.
Close.
Uhoh. What happened there?
Uhoh.
Oh, my little uh All right, time out.
My little uh dog uh uh is my little dog's missing.
Let me uh let me fix that. All right, now very carefully.
First couple of times.
Okay, we're up against our little chingga stop.
All right.
Hear something.
Okay, this is session.
So, we'll traverse across what we're looking for. I'm pretty sure that's the big end.
And I'm just going to come to a zero at this end cuz I got plenty of plenty of shaft length here.
That should be the end of the road there.
Actually, I should zero this that way. I can see what's going on.
Now, I want to be on the part when I lower because I I want the It's just a good habit to get into because uh if you're if you're doing up to a shoulder, you don't want the the corner of the wheel to uh to wear away.
All right, so we're getting a cut now.
So this is I mean I don't do this all the time so kind of uh semi exciting uh initially at least and then it switches over to boredom Hey, Heat.
Heat.
Heat. Heat.
5577570.
zero.
Okay, I think I can live with that.
That's pretty good. All right, think we're done in there.
Now, we got a little more lathe work uh to finish that up. And then on the mill That should be the first shoulder.
It's a little big.
I for I forgot what goes on there. What goes on there?
Um, oh, it's some O-rings.
Yeah, it's O-rings.
So, that is u this part here. The the seals actually sit on that. So, um I don't need to do anything there.
Okay. All right. So, the next uh spot is 306. Let's make a little mark at 306.
See, that's two, three, 30 right there.
Diameter is 248.
Heat up here.
Let's one thing about this monarch is uh there's there's no good um place. All right. 340.
Uh there's no good place to like set the micrometer down. Right. So, okay. So, what was our diameter? 248.
So, we got about 92,000 to go there.
Let me set my dial.
All right.
50.
Double check that.
Okay.
All right.
All right. 260 even.
Uh what was in my number?
248.
My My other lathe is handle up for forward.
So, this one's still psyches me out a little bit.
Muscle memory, right? All right. I think that's good.
Okay.
All right. Okay, ready for some uh thread action.
Seemed a little a little fast to me.
That's better.
I can't see it.
First threads on Sydney here.
Heat.
Heat.
Okay.
Heat.
Heat up here.
All right, got a nice spot drill there.
Now, what's the hole? It is 318.
318. What is that? What is 318?
Is that a That's like a letter size, right?
318.
Oh, all right. Close this a little. Okay, let's use an O drill.
We're going to use an O drill area.
That's 316.
All right.
Pretty slow here.
So, some people might be wondering why I uh didn't drill a pilot hole through here. So, in in hardened materials, um a lot of times when you hit that um you hit that edge with a drill, um it'll destroy the drill. So, we're going to go through full diameter right out of the gate here.
And you can see it's working fine.
This this stuff is not that hard. Um, you know, compared to tool steel and stuff like that. It's like C, let's see, uh, C4547, something like that. uh in this H900 condition.
But uh yeah, sometimes when you hit that that edge um it can really just kill your drill.
How do I know that?
How do I know that?
I guess I have some some killed killed drills, right?
Yeah, you can hear it when it broke through. It's kind of crackly.
Okay.
Now, now we got to put a little uh chamfer. Oh, that drill's hot. So, yeah, that drill was working for its money there.
Okay, let's see. I think I got a multi multiflute over here. float. Let's do that one.
And put that back gear cuz a little more. So, what I'm looking for, just so you guys know, you know, because it's on a curve, right? It's going to bite harder on these corners here. But what I want to see is I want to see that just breaking that edge right there. And that's the depth that I want in this particular case.
Almost have to do a little Extracurricular burn. Yeah, this convers is it?
All right, there we go.
Okay.
And then now the uh for the uh the um the reverse side. What I'm going to do, let's get that out of the way. I know it's going to blow away there. So, I'm just going to use this as a guide to orient it like so.
Okay, it looks pretty happy.
You know what? I might I'm going to try I didn't like that. H, but what do I got? What do I got handy? Let me find something else. I I didn't like that particular counter sync. All right, let's try this one.
This one's This one's carbide.
This one's working better.
Much better. Okay.
Okay. So, there's our replacement.
And um here's the stackup backup ring, O-ring, another backup ring, and then uh this brassium washer.
And then our nut. Actually, I'm not going to tighten this all the way up.
Our 1224 nut.
Okay. So, looks pretty good. So, then we got this.
This is H. Oops. So, this this guy will go on here once we um are ready to assemble.
And I don't know. Uh I think we're pretty close to putting the bottle jack back together and testing it. So, uh, I'm Am I getting excited? No, I'm I'm hot and I'm tired. I'm going to get a drink of water and I'm going to wrap this video up. What do you think about that?
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