Machining a Model Steam Engine - Part 20 - Assemble and Run

prior to installation the eccentric rod needs to be bent these are about 12 degree bends on either end of this particular rod and the bend starts at about one inch in 25.4 millimeters in from each end the fixture is a pair of three quarter diameter roller bearings quarter inch pins they are 7 8 center to center i'm going to lay the rod in there and i'm just going to drive this 45 degree radius wedge down in between them and make a nice clean bend you could probably do this with just pins but i know from experience if you use just pins you're going to get drag marks and abrasions on the outside of the brass easily filed out but why bother usually let's use rollers all right let me get this on the tripod and get it done it's going to take a minute during the assembly of this particular model there are just a couple of spots where you really need to take close notice and pay attention to how things are adjusted you cannot just screw these together and have them work it's not how it goes the throw on the crank is fixed i do not have the other cap on and there's only one screw in the rod just for sake of setting this up for this shot on the maximum stroke when the cross head slide is all the way out excuse me you want to make sure that the piston falls within the length of the cylinder in this case it does not that means the very first time you tried to fire this thing up this piston would bottom out on the cylinder head and it wouldn't move any further the adjustment for that the only adjustment you have is to turn this rod right here and drive it further down into the cross head slide so as the eccentric of the crank comes around you have full control over how close that is to the end of the cylinder let's stick it all the way in there and see what happens and don't forget that the cylinder head itself has a small boss on it that will go down inside and potentially cause some interference you want to check it out feed the cylinder over the piston and watch for it to come out the end if it comes out the end you need to dust it back in same thing with the backstroke watch for this gap here to close up and not hit the inboard head if it bottoms out it'll lock up on the backstroke so you want to see that gap right there behind the piston i would say that would be very close to being exactly what you're looking for that is the first adjustment that you need to be very aware of so be very aware of that second adjustment is on the valve itself let's take the cylinder assemble some components on the cylinder and show you what's going on inside here and how to adjust it the underside of the valve has a 375 square in it and that 375 square will only overlap two of the three holes here at a time see if i can position that so you can see it it'll either cover the last two or the front two but with the eccentric of the well it's called the eccentric and connected to the crankshaft you want to position this so that the throw does exactly that transitions from one to the other you have minimal adjustment here to adjust where this rod sits that will move it back and forth it will not move once it's locked down because this side does lock it locks to a small clevis that connects to the eccentric rod the other opportunity that you have to adjust this is at the eccentric where the eccentric sits on the cam that sits on the crankshaft simply screw it in that's hard to do when it's bent like that simply screw it in and that gives you all the other adjustment that you need i don't think i would recommend messing with too much of this there's not too many threads down inside these small clevis sections so just enough for a nut on the outside and enough for a nut on the outside of the mating part use a paper clip or something if you're going to test fire these because once they're all assembled they can be a bear to adjust knowing that that was done behind the scenes let's put it together [Music] [Music] me [Music] [Music] if you flatten out the teflon packing material before you try to install it it makes it a lot easier going in it will swell up after a couple of minutes so be sure to re-torque the flanges installing the packing from the front is much easier do do [Music] do thank you do do do [Music] oh [Music] [Music] [Music] do do not forget about the two screws underneath are hard to torque down but they're there if all went well you should be able to clock the cylinder mechanism to the main base at 90 degrees i used a one two three block and a surface plate to check mine love it [Music] thank you okay builders note this morning i went looking for wrenches to tighten these down i knew i was going to have to turn them in opposed directions and i did not want to use needle nose pliers i went out and bought the cheapest screwdrivers i could find and i slotted the ends there you go 97 cents these were each us three sixteenths so anybody looking for three sixteenths open and wrenches good luck do [Music] [Music] do hmm me do do do pay close attention to the gap on either end of the valve regardless of the timing at this point you need to make sure that all the rods are adjusted to the correct length i know for a fact that this is not correct but i want to show you what you're looking at okay i'm bottomed out we're talking about i guess it's about a three millimeter gap right here and watch the other end and full stroke back let's go full stroke to the front okay much tighter see the gap now you want to balance those gaps out that is really important the way i'm going to do that initially i'm going to pull this pin back out which is why it's only a temporary and i'm going to use the adjustment that i have right there and test it again that little hole is a booger fine geez always there it is all right let's cycle the cylinder one more time i would say that gap is just about perfection completely exposes the one port while it's covering the others let's see the full stroke this way beautiful can't ask for better balance than that once everything is locked down although this rod does float it is not going to change where it's at the only thing that needs to be changed now is the orientation of this cam to the stroke i say that's a win right there we're going to leave it right where it is lock everything down and time it actually i'm going to put this cover on first and the flywheel because i just can't wait to see that [Applause] assembly drawing shows it as horizontal but you can see the rod flexing watch the rod this rod is going up and down on an eccentric see the flex right there back here watch it go down that's got to be stressing the valve inside and up again all right anybody building this horizontal on the pin okay cleavage got to go vertical i'm going to adjust that right now okay this guy right here has got to be the toughest part of the entire model to adjust it is more than apparent my teflon has seated and this needs to be adjusted boy that's really tough to get to i don't know if i'm going to bother i'm going to leave it right where it is for now let's take a look at the horizontal positioning of the pin the rod needs to be able to float boy that's we can't even tell it's gone all right who wants to see some air let's do it right drum roll please moment of truth people [Applause] so i love it [Applause] so [Applause] well guys in the absence of a base in the absence of any more parts to make that brings us to the conclusion of this particular project if and when i paint this thing in the future and put the appropriate fittings in here these are quarter 40 fittings i will be back and i will give you a second visit if there's anything that you want close-ups of if there's any questions for all you guys that bought these models by all means put something in the comment line i'll be happy to answer your questions i have learned a lot along the way and i thank everybody for their comments their views and their support i am thrilled this is if this is the only thing i get for christmas i will be absolutely just beside myself love it first one ever thank you all very much merry christmas to you all happy new year and see you 2021. you

Channel: Joe Pieczynski

Views: 122,347

Rating: 4.9371233 out of 5

Keywords: Joe Pie, JoePieczynski, Advanced Innovations, advanced innovations llc, how to, machine shop, shop tricks, shop hacks, shop techniques, shop tutorials, steam engines, scale models, assemble a steam engine, pm research

Id: Ytx2wbigCHk

Length: 33min 46sec (2026 seconds)

Published: Wed Dec 23 2020