Stirling engine build

vridhisharma · Apr 26, 2013

Great collection. I appreciate your post.

Mitchg07261995 · Apr 26, 2013

franscubitt said:
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!!

it is running in aluminum side plates

Mitchg07261995 · Apr 26, 2013

Here is what I made yesterday...

It holds up the displacer standard like so...

ZebDog · Apr 27, 2013

i have to agree with canalzombie about your displacer piston it does look like solid ali having looked at the pics the plan does say hollow.

you made a great job of the flywheel well done.

Mitchg07261995 · Apr 28, 2013

ZebDog said:
i have to agree with canalzombie about your displacer piston it does look like solid ali having looked at the pics the plan does say hollow.

you made a great job of the flywheel well done.

true it does say hollow, i am not sure about doing this... It does not show any dimensions for it, just the external dimensions.
Do i just go at it nice and slow with the boring bar and leave the side walls .050 thick, the crown .250 thick and the center were the connecting rod goes in at least .250'' thick?

ZebDog · Apr 29, 2013

the wall thikness of .050 is ok i would go to .125 on the crown and the end for the conecting rod .025 as you say
be carefull when boring the wall as it may colaps in the chuck jaws i had this happen to me. Don't worry about the wall thikness being a little thicker the idea is to make it as light as possable
good luck

Mitchg07261995 · May 1, 2013

Ok, today started out not so good but got way better by break time in my class... I tried about 5 different cutter bits before finding one that would not give me any chatter, or loud squilling when cutting my newest part...
I made a new Displacer piston today, 2.500'' long, 1.125'' diameter and I hollowed out as shown on plans, I will have to modify they design of the pushrod to be 5'' long and theaded 1/4x20 at the top

franscubitt · May 2, 2013

Hey looking great Mitch, I am trying to get myself a bigger lathe with a milling attachment so I can also make one.
keep up the good work

BillyHill · May 2, 2013

Mitchg07261995 said:
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.

Hi Mitch, I'm a new member here at HMEM but a long time machinist. I just started reading your build thread today and it's been awesome. I'm currently designing my second motor (first was a finger motor I did without a lathe) and some of the things I've learned in this thread about engines are going to help me with my future builds.

As for you, I'll tell you as a 3rd generation, 3+ decades machinist your attitude (i.e. passion) towards this project can take you a long way if you keep at it. Pops told me two things about this profession when I was a kid; 1) The more you learn the more you realize you don't know, and 2) I'd never get super rich but I'd never be out of work either. So far he's been right on both counts.

Mitchg07261995 said:
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

I've found that lowering the parting tools slightly from center-line helps keep that underwear-changing grabbing from happening.

Keep at it. Thm:

Mitchg07261995 · May 3, 2013

BillyHill said:
Hi Mitch, I'm a new member here at HMEM but a long time machinist. I just started reading your build thread today and it's been awesome. I'm currently designing my second motor (first was a finger motor I did without a lathe) and some of the things I've learned in this thread about engines are going to help me with my future builds.

As for you, I'll tell you as a 3rd generation, 3+ decades machinist your attitude (i.e. passion) towards this project can take you a long way if you keep at it. Pops told me two things about this profession when I was a kid; 1) The more you learn the more you realize you don't know, and 2) I'd never get super rich but I'd never be out of work either. So far he's been right on both counts.

I've found that lowering the parting tools slightly from center-line helps keep that underwear-changing grabbing from happening.

Keep at it. Thm:

Thanks for the kind very words, What you said is so true. I have realized how much more there is to learn than what I know already, and I love learning new things about machining

I will take your tip into mind when I part off another part, by setting the tool just slightly below center line, dont want to do any more underwear-changing from that happening again

Mitchg07261995 · May 10, 2013

well, i wont be able to finish the engine this school year. today we spent the whole day cleaning our shop, getting things put away and accounted for and we had to turn in our parrallel kits and our tool boxes with dial caliper, micrometer, and 6 inch rule

franscubitt · May 10, 2013

Oh Hell thats not so cool, when does the next term start? and can you continue with the motor then?
cheers Frans

AussieJimG · May 10, 2013

Have you joined a local model engineering club? Chances are one of the members will help you or even let you use some tools under supervision. And you get to know some of the like-minded lunatics in your area.

Jim

jwcnc1911 · May 10, 2013

Where are you located? Do you know any one with a shop?

Mitchg07261995 · May 11, 2013

Frans: I believe the new school year for me starts again in august and I plan to continue working on it when I get back
Aussie: I have not joined any model enginering clubs in my area because I dont know of any
JW: I unfortionetely do not know anyone with there own shop

AussieJimG · May 11, 2013

Try Googling "Men's Shed", Model Engineering Clubs in your area, look up the phone book, go to the College and ask the teachers, go to the local tool shop and ask and to the local hobby shop. Look for model aircraft clubs.

By August you can have this finished and be on to the next engine. Don't wait!

Jim

Mitchg07261995 · May 12, 2013

AussieJimG said:
Try Googling "Men's Shed", Model Engineering Clubs in your area, look up the phone book, go to the College and ask the teachers, go to the local tool shop and ask and to the local hobby shop. Look for model aircraft clubs.

By August you can have this finished and be on to the next engine. Don't wait!

Jim

thanks for the tip Jim

ill start searching

Mitchg07261995 · Oct 10, 2013

Well after about 5 months of not working on this engine, my pal Jared talked me into finishing it in class. I have about 4 or 5 parts left to complete
Today I started making a connecting rod that is about 2'' long and threaded 5-40. And I made a ring that is a very tight press fit onto the displacer cylinder so that I can have a better way of attaching the 3/16 brass tube to the cylinder

jwcnc1911 · Oct 10, 2013

I followed back in April/May and hope to see you complete it. You will be glad you finished it! There is a special feeling of completion and satisfaction with seeing a project all the way through to the end.

Mitchg07261995 · Oct 11, 2013

now that is for sure jwcnc1911!

I made an alcohol burner last week, not really to any specified dimensions, I just went by feel and what I thought would look awesome
Here is the burner...

Here is the holder for the burner

The burner is just a loose slip fit into the holder

This the burner can be rotated to any degree that I might need

and here is how it will sit on the finished engine right underneath the displacer cylinder.

Stirling engine build

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