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Author Topic: Rocker Engine  (Read 29187 times)

Offline foozer

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Rocker Engine
« on: July 18, 2009, 01:04:54 AM »
Ok I'll toss this attempt into the mix. The little rocker engine

Two whole pieces complete, weekend project?

The axle and crankdisk, small, tiny, need new glasses

Dont want any tool envy going on now

First shot drilling the holes in the disk with my fancy dancy cross slide
thing-a-ma-bob, it works

Second cutting off the excess to which I dropped the other piece and spent 20 minutes looking for it. Of course it found that little space between to lathe stand legs and floor bolt down bracket. All nice and cozy it was too, just a-sitting there watching me hunt

Third shot facing the disk down to finish size, Yes there is a part down in there

Final first 2 little pieces. Photos don't do it justice. that is a small little engine.

Robert
« Last Edit: July 18, 2009, 01:13:16 AM by foozer »
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bogstandard

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Re: Rocker Engine
« Reply #1 on: July 18, 2009, 01:12:50 AM »
Robert,

You need to talk to our John Hill. He is only just starting to use a vertical slide, and you might be able to show him a few good pointers.

Nice work by the way.

Bogs
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Offline foozer

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Re: Rocker Engine
« Reply #2 on: July 18, 2009, 01:16:01 AM »
Quote from: bogstandard on July 18, 2009, 01:12:50 AM
Robert,

You need to talk to our John Hill. He is only just starting to use a vertical slide, and you might be able to show him a few good pointers.

Nice work by the way.

Bogs

I've read his bit on its usage, limited use is right, A version 2 is coming up near future
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Offline sbwhart

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Re: Rocker Engine
« Reply #3 on: July 18, 2009, 02:09:30 AM »
Nice work Robert a vertical slide certainly makes a lathe a truely versatile machine.

I thought I was the only one who dropped and lost things I guess we're in the same club. Its just one of the penalties you pay for having a liking for making small bits.

I'm trying to finish off my rockers over the weekend but my Boss has other plans so I don't think I'm going to get much shop time.

Have fun

Stew


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Offline foozer

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Re: Rocker Engine
« Reply #4 on: July 18, 2009, 02:36:43 AM »
Quote from: sbwhart on July 18, 2009, 02:09:30 AM
Nice work Robert a vertical slide certainly makes a lathe a truely versatile machine.

I thought I was the only one who dropped and lost things I guess we're in the same club. Its just one of the penalties you pay for having a liking for making small bits.

I'm trying to finish off my rockers over the weekend but my Boss has other plans so I don't think I'm going to get much shop time.

Have fun

Stew


Slide has been handy. Pieced it up to get some vertical adjustment and use the cross slide for the horizontal. Really need to get version 2 going, gain a better balance of overhang and range of movement. Like John Hill I believe has pointed out, cross slide travel to spindle axis limits the range considerable.

Think next on the Rocker engine will be the Flywheel. Wanted to build this thing to spec, thinking tho, the flywheel is gonna suffer some creative changes :)
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Offline foozer

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Re: Rocker Engine
« Reply #5 on: July 18, 2009, 08:30:29 PM »
Flywheel time.

Plan calls for a 1.250 inch dia piece. Hmm dont have a piece that fits the requirement. Do have a piece of bronze bearing that has an OD tad greater, do have some AL that an OD a tad  smaller. A two piece adventure.

Made the rim, OD 1.250 inch ID 1.050 inch
Made the web OD 1.055 inch  (heat rim, chill web press together?)

Drilled holes in web, took the vise of my handy dandy and mounted a little RT. And yes it is hard to see things at that angle. Changed number and size of web holes to account for smaller dia web. Started at 0 and went +72 from there to get the 5 holes.

Brides cooking a chicken sitting on a beer in the oven, seems like a good time to pop the bronze rim in


Problem coming up with this attack method. Flywheel is going to wobble. Have left some extra on the flywheel to skim it straight but . . Solution best i can ponder is to make a new axle shaft slightly oversize on the bearing end. press it into the flywheel, soft jaws will handle the true up of the assembly.

Robert
« Last Edit: July 18, 2009, 09:05:10 PM by foozer »
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Offline sbwhart

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Re: Rocker Engine
« Reply #6 on: July 19, 2009, 01:59:32 AM »
Quote from: foozer on July 18, 2009, 08:30:29 PM
Flywheel time.

Solution best i can ponder is to make a new axle shaft slightly oversize on the bearing end. press it into the flywheel, soft jaws will handle the true up of the assembly.

Robert

Hi Robert

Thats how I did my flywheel it'll work out spot on. Like the composite fly wheel idea that's what I also did for my Elbow Engine build had some problem with the shrink fit didn't quite get the shrink quite right and because of the material I used for the hub one of the spokes cracked, resorted to high strength loctite that did the trick.

Have fun

Stew
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Offline rleete

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Re: Rocker Engine
« Reply #7 on: July 19, 2009, 10:27:17 AM »
Shrink fits are tricky.  For something that small, you need damn near line to line.  You're probably better off going for a press fit.  If you end up a bit too loose, loctite works.
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Offline Brass_Machine

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Re: Rocker Engine
« Reply #8 on: July 19, 2009, 10:58:22 AM »
Wow thems some small parts!

Anxious to see it complete.

Eric
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Offline foozer

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Re: Rocker Engine
« Reply #9 on: July 19, 2009, 04:23:52 PM »

I thought all was centered, really I did, OH? you mean subtract half the edge finder dia from the . . .

This time around used the indicator, at least I think I am. Rotate the part and get a max run out in the 1-2 thou range. Could fiddly forever but that's within my comfort range for now.

Drilled the holes, 6 this time, they fit. Set it in the soft jaw and as I hate turning that handle I used the old "Dont you wish you had one" Cross slide power handle turner. 6 minutes later she be all nice and even.

Shot showing the failure on the right, could'a sworn everything was centered. The better flywheel on the left. My lunch underneath :)

Now to get the crankshaft attached and true
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Offline sbwhart

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Re: Rocker Engine
« Reply #10 on: July 19, 2009, 05:00:44 PM »
Robert

That fly wheel looks the buisness  :thumbup:  nice to see how your using the versatility of the vertical slide  :thumbup: I'm shure some of the guys will learn a lot from this thread  :wave:

Have

Fun

Stew


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Offline foozer

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Re: Rocker Engine
« Reply #11 on: July 19, 2009, 06:26:49 PM »
Quote from: sbwhart on July 19, 2009, 05:00:44 PM
Robert

That fly wheel looks the buisness  :thumbup:  nice to see how your using the versatility of the vertical slide  :thumbup: I'm shure some of the guys will learn a lot from this thread  :wave:

Have

Fun

Stew


Thanks, only other attachment for the crude vertical slide is a plate with a bunch of tapped holes in it to handle what the little vise wont. Its usage is limited but with no mill at least some of the functions can be emulated.

Have a 4 inch angle plate that will be the base of the next generation slide. More robust, attempt to reduce the overhang and increase the range of use around the spindle axes.

Robert
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Offline Bernd

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Re: Rocker Engine
« Reply #12 on: July 19, 2009, 07:51:52 PM »
Robert,

Turning out some neat work on that little lathe. Nice going.  :thumbup:

Bernd
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Offline foozer

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Re: Rocker Engine
« Reply #13 on: July 19, 2009, 08:47:48 PM »
Quote from: Bernd on July 19, 2009, 07:51:52 PM
Robert,

Turning out some neat work on that little lathe. Nice going.  :thumbup:

Bernd

Thanks

The lathe and I are having a discussion today, it says "HAHA, you want plus or minus what?" and I say you'll be anchoring the boat you (Bleeped)

Got this 30 ton log splitter if firmer measures are required :)
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Offline rleete

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Re: Rocker Engine
« Reply #14 on: July 19, 2009, 09:05:11 PM »
Keep at it.  Those tiny parts are a real pain, but it's a great little runner.
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Offline NickG

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Re: Rocker Engine
« Reply #15 on: July 20, 2009, 07:29:24 AM »
Nice, I definitely want to make one!

RE: losing small bits, when I was at my dads a few months back looking for something, in a box there were several piston rods from my first ever steam engine ... an oscillator with 1/8" bore and about 3/8" stroke that was featured in Model Engineer. He said he found them down the back of the lathe when we moved it! Some of them were just ones where i'd made mistakes but some were lost .. never to be seen again!

Nick
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Offline foozer

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Re: Rocker Engine
« Reply #16 on: July 21, 2009, 10:32:33 PM »
While most have completed their 'Rocker' I'm still chugging away, ignoring all other items that need attention. OK I did get the tranny back into the car, still sitting on stands tho :)

Where am I? OH the piston. Turned it down and figured I'd better get that little hole drilled before I have a piece I cant handle. Another way around the fence. Took a piece of AL same dia as the piston stock, drilled a 0.0125 hole into one end. Measured in 0.517 and marked.



Slipped the piston rod into this and mounted into my little hole drilling jig.



Worked. Hole looks right so now to remove the rest till just the piston/rod remains.



Robert

Slow, yup  Fun, YUP
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Offline NickG

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Re: Rocker Engine
« Reply #17 on: July 22, 2009, 08:38:11 AM »
Good progress there Robert, like some of your work holding methods, you definitely make the most out of your lathe.  :thumbup:
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Offline Bernd

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Re: Rocker Engine
« Reply #18 on: July 22, 2009, 10:28:34 AM »
Robert,

Nice work. That fixtureing was a neat idea.

Bernd
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Offline sbwhart

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Re: Rocker Engine
« Reply #19 on: July 22, 2009, 11:28:42 AM »
Robert

Real nice work as I've said you've got a real gift with the vertical slide  :clap: :clap: :clap: :clap: :clap:

Stew
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Offline foozer

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Re: Rocker Engine
« Reply #20 on: July 22, 2009, 12:55:19 PM »
Quote from: sbwhart on July 22, 2009, 11:28:42 AM
Robert

Real nice work as I've said you've got a real gift with the vertical slide  :clap: :clap: :clap: :clap: :clap:

Stew

Stew, Bernd, Nickg   Thanks for the kind words


You know what they say, If all you have is a bushel of lemons, make a rocker engine


Robert
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Offline foozer

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Re: Rocker Engine
« Reply #21 on: July 25, 2009, 12:14:33 AM »
This is my second engine built. So the wobbler now has a buddy. Have no idea what number 3 will be like.

Bitten by the "Cant leave it alone" bug, some minor deviation from the plans occurred.



Figured someone would ask how it works so, well its a show and tell.



Still need to change out the screw for the crank disk. Should be a runner



Bride will be ticked when she figures out where the stand came from, No honey! there were only 5 goblets in the set, really. . .

Robert
« Last Edit: July 25, 2009, 01:58:56 AM by foozer »
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Offline sbwhart

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Re: Rocker Engine
« Reply #22 on: July 25, 2009, 02:02:27 AM »
Hi Robert

Thats a neat idea having the perspex cylinder so you can see the action, love the goblet stand it adds to the elegance.

Have fun

Stew
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bogstandard

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Re: Rocker Engine
« Reply #23 on: July 25, 2009, 02:15:06 AM »
Very nice indeed Robert.

It is nice to see people deviating from the drawings, it makes a truly unique engine.

Now how much is it worth for me not to send your better half an email about the missing goblet? :lol:


Bogs
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Offline foozer

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Re: Rocker Engine
« Reply #24 on: July 25, 2009, 03:11:39 AM »
Quote from: bogstandard on July 25, 2009, 02:15:06 AM
Very nice indeed Robert.

It is nice to see people deviating from the drawings, it makes a truly unique engine.

Now how much is it worth for me not to send your better half an email about the missing goblet? :lol:


Bogs

Quote
Posted by: sbwhart

Hi Robert

Thats a neat idea having the perspex cylinder so you can see the action, love the goblet stand it adds to the elegance.


Thanks for the compliments,

Making a "Bell" from the goblet remains, has a nice tone to it. Give it to the bride and she'll never know, maybe, hope so, perhaps. Boy am I gonna be in the dog house
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