Hit and Miss Engine Model

[namonllor]

Jack, Thank you for sharing this build as I was looking at the purchase of this plan, but wasn't sure. Reading your posts and seeing your great strides and accomplishments, I know this little engine will be in my future.
You're doing a great job so please keep up the great work.
Thank's again,
Ren

 

[RICHARDDV]

sorry im wrong , it was 3 for 10.00 --got new specs since post , now i can see --richard

 

[cobra428]

Hey Jack,
Have you looked on Jerry's site lately? He put a nice paint job on his Farm Boy.
Tony

 

[Maryak]

Jack,

Nice job on the crankshaft. :bow: :bow:

Best Regards
Bob

 

[Maryak]

Jack,

Not only the crankshaft, the whole thing looks top drawer. :bow: :bow:

Best Regards
Bob

 

[jpaul]

Jack
Outstanding work and you are making good progress.

I have always made my flywheels (only 4 to date). I found them to be quite easy assuming you have a rotary table. Also, my local metal supplier carries cylindrical remnants that he sells by the pound, so the price is right.

One question maybe you will share. Jerry Howell calls for 2 very small holes in his carburetor, one a #65 (.035") and the other a #76 (.020") . How did you acquire these and what chucks and speeds did you use?

 

[Maryak]

As far as making flywheels I have done it and yes it's not that hard, but I want the look of a cast iron flywheel for this project.

Jack,

Do you mean you want them to be Cast Flywheels, look like Cast flywheels or just made from cast iron ???

Just curious. ;D

Best Regards
Bob

 

[Maryak]

Jack,

1st up

A suggestion, here we have a company who sell the remnants of spun cast iron bars, which is really nice material and very easy to machine. A piece 6" diameter would cost around $AU200/ft. BUT you have the rest for cylinders, pistons, piston rings etc. I did this with some 4" dia and I am still chopping lumps off it. I have so far made a full sized, (3 1/2" piston with matching rings), pistons and contra pistons for my 2 diesel models, the cylinder for my hit and miss. I will also be making the piston and rings for the H&M and I still have about 4" left.

Another source is foundry sprues, free but you don't quite know how much is usable. Or for a nominal sum the foundry will sell a lump say 10" x 8" x 4." To get under the skin you need carbide tips and when cutting it up it eats HSS power hacksaw blades at an alarming rate, (I ended up drilling and then belting it apart with a hammer and chisel).

You pays your money and you make your choices. I made a whole mill engine from sprues and said lump including the base 9" x 3 1/2" x 1 1/4".

Hope this helps. ??? ???

Best Regards
Bob

 

[rake60]

It's looking great Jack!

Rick

 

[vlmarshall]

Does anyone use cast iron freeweights from sporting-goods stores as flywheel raw stock?

 

[GailInNM]

vlmarshall,
I used a couple of barbell weights. Most are not satisfactory as they are really rotten iron with lots of inclusions. I found the BFCO ones are not too bad, but I probably would not do it again. More comments at:
http://www.homemodelenginemachinist.com/index.php?topic=2544.msg25701#msg25701

Gail in NM,USA

 

[vlmarshall]

vlmarshall,
I used a couple of barbell weights. Most are not satisfactory as they are really rotten iron with lots of inclusions. I found the BFCO ones are not too bad, but I probably would not do it again. More comments at:
http://www.homemodelenginemachinist.com/index.php?topic=2544.msg25701#msg25701
Gail in NM,USA

Thank you! It was just something I've wondered about.

 

[Maryak]

Jack,

Glad you sorted your flywheels and very nice they are. :bow:

Best Regards
Bob

 

[zeeprogrammer]

Very nice Jack.
It made be go through the entire thread.
Any chance of some closer-up pics?
I'd like to see more of the governor as well as other details.
Thanks.

 

[RobWilson]

GREAT LOOKING ENGINE :bow:
ROB

 

[zeeprogrammer]

Thanks for the pics Jack!

Sorry I hadn't replied earlier. I think I'm doing something wrong in trying to keep up with posts. Don't know why I missed this.

But anyway...found it...and glad I did.

Thanks again. These 'hit and miss' engines are getting more and more interesting.

 

[cafox513]

Have you tackled the Hall sensor bracket yet? I'm looking at the drawings (of the one to be used with the spark saver), and am totally stymied. Leaving out the lack of a dimension on one part, the drawings don't seem to agree.

 

[Brian Rupnow]

I'm posting mainly so I can find this thread again.---Brian

 

[Rudy from Norway]

Jack, I'm building Farm Boy #651 now and would very much like to see yours. The pics in your thread are gone.

Rudy

 

[the engineer]

guys its only a blank for the real thing cant you see it behind the tool cabinet