Stirling engine build

[Mitchg07261995]

got some more work done today, one more part is finished the whole in the top just needs to be enlarged a little. Maybe .002'' im going about doing this by sanding it till the part that goes in the whole is a press fit

i modified the piece that my pal gave me, I need to make the space in between the part a little more wide so im taking about .010 at a time till i get the clearence for the flywheel that I need

thats all for now
Mitch

 

[hobby]

Mitch, a big hardy welcome to the forum,
It is great to have you show us your progress on your school project, as watching your progress from one part to another, it is easy to see you are achieving better machined parts as you continue, you are doing a great job, most of us have the conveniaence to work with our own tools in our own shops, but you are limited both in time and tool usage, so you are achieving a great wealth of machining ability, under the limited circumstances your under, your making great progress in the machining of parts, keep up the good work.

 

[AussieJimG]

That's coming along well Mitch

Jim

 

[Mitchg07261995]

Thanks a bunch Hobby, I love doing this work it is so much! It it so much fun to get to know how to make stuff on the machines that we have. We are pretty well stocked on material and machines. My teacher is a great help! Some times he does have a little fun and makes jokes with us. I am learning a bunch of stuff from my class and here on the forum! I used the harbor press a little more today and I cant wait to make one next year
Thanks again for all the tips and the support
Mitch

 

[Mitchg07261995]

no work made today on my engines, spent the whole day tramming milling machine heads, cleaning and cutting 32 pieces of alum for the Skills competition that is taking place tomorrow through friday

 

[robcas631]

Where can I get these plans?

 

[Mitchg07261995]

Where can I get these plans?

My teacher has a book in our class room with plans for model engines, he pulled them out of that. I can probably get a scan for you and anyone else that might be interested.

 

[franscubitt]

Hi Mitch, is it my imagination or is the last plate blueish?
Yes Please I would love a set of plans and if any cost can happily PayPal you.
Cheers Frans

 

[Mitchg07261995]

The bluish coloring on the last part is just some layout die that I have not removed yet. The plans are in my locker at school so ill try to bring them home on monday and get them scanned. If you do build it, it would be awesome to see another one being built

 

[Mitchg07261995]

Made some more progress on this engine today, warning the post ahead will be vary picture heavy (39 pics) showing the progress that I have made today along with close up pictures of the plans for the engine.

 

[Mitchg07261995]

here is what I did today...
cut the 1.500 steel round stock for these 2 parts

here is the stock

got most of the lathe work done on these parts

the aluminum part is part of a connecting rod, needs to be threaded 5-40 on the front, it has a 1 degree taper running down the shaft
the brass piece has an internal thread of 5-40 and is the mating part of the connecting rod
here are the parts that I have that are ready for milling

I tried making the main shaft again but the final dimension was about .005 under size

so I made another which is pressed into the flywheel and I will remove it and harden it tomorrow, it is the correct dimension in every way and i have it running true to with in .0003''

I drilled the oil holes in the flywheel standard
I know they are not centered but I am happy with the result

I got the brass tubing needed for the engine

and for the people interested in the prints for the engine

 

[Mitchg07261995]

I got 2 more parts completed today, the displacer cylinder connecting rod, and the main shaft. Plans call for aluminum for the connecting rod but I made mine out of steel, the rod and shaft have been hardened in out furnace at 1500 degree's farenheit for 15 minutes then quenched in a bath of oil for 2 hours
pictures to come in a little while
Oh yeah, I have also started on one of the crank disks and is almost complete, I just need to drill the hole for the crank pin and drill/tap for the set screw

 

[Mitchg07261995]

OK here are the parts that I completed today
main shaft, connecting rod.
Main shaft,

hardened and running perfectly true
Connecting rod, also hardened and finished completely today

overall length is 3'' and 11/16", it is 1/8" thick and has a 1/8" hole at the top and 3.250" over along the center line is a 3/36" hole
Here is one of the 2 crank disks that I started today, all that is left todo is drill the crankpin hole and tap it, then drill/tap for the set screw at a 45 degree angle

Ill true up the back side of that part tomorrow, drill and tap all holes and maybe harden it over the next couple of days
Here is the flywheel, main shaft, standard assembly, and the crank disk

and the final picture is my overall progress with all parts that I have that are either finished, or almost finished

thanks all for looking! ill post another progress report tomorrow

 

[Hopper]

Thanks for posting the plans. Very nice.
Looks like you are making good progress. Can't wait to see a vid of it running.
Have fun.

 

[Mitchg07261995]

Your welcome
I hope to make the other crank disk today and drill all holes for both, Im loving this build so much it has taught me alot and improved my skill greatly. Yesterday when I was parting off the crank disk I almost broke the tool. Lathe was going in back gears, I was feeding extremely slow with plenty of oil and pulling away from the part to break chips. But the part grabbed to the tool made a loud "pop" so I pulled out real quick and my teacher looked at me smiling a little and said with a slight laugh "you break the tool?" which I did not then he said "you okay?" i said yes, but anyway he is a great teacher
P.S the parting tool was on the exact centerline of the part

 

[Mitchg07261995]

I finally finished the flywheel today

 

[AussieJimG]

That's looking good Mitch, you are right on track.

Jim

 

[Mitchg07261995]

im just glad the flywheel is done

 

[franscubitt]

Wow thanks very much Mitch, its looking superb, cant wait to see this baby running.
Thanks very Much for posting the Plans, I will print tomorrow, Just have to work tonight! One of the bad things about
Being your own Boss!!
Just one quiry, the Flywheel shaft is steel, is that running in the steel side plates? or did you have to bush the side plates?
Good luck and your flywheel is awesome, I love it!!

 

[canalzombie]

It looks like your aluminum displacer is one solid piece of stock.It needs to be a thin walled cylinder.(It is one of the more perplexing issues for Stirling builders). Your engine will probably work, but it will perform poorly. The displacer must be lightweight and airtight. It will be moving incredibly fast displacing , or moving the air back and forth from the displacer cylinder to the power piston. (I had to mention this...I don't know if anyone else noticed it and just didn't mention it).