New ..

[minh-thanh]

Hi All !
I designed the engine
Hope I can do it

 

[aka9950202]

Looking forward to the build. Will the plans be available to the public? Are they in metric?

Cheers,

Andrew in Melbourne

 

[minh-thanh]

aka9950202!
They are in metric
About the plan, most of the components have a zero tolerance (the diameter of the cylinder and piston is 16mm, ..) it is more like a Lego assembly than a mechanical plan or engine plan
I had a friend give me some advice on tolerances ... (who is a member of this forum), so I'm also planning that when I do this engine I will measure and determine all The dimensions of all details
all the engines I've done, they have almost no plans or only one part, I'm trying to redraw them.

 

[Cogsy]

Looks great. I'll be watching this one!

 

[minh-thanh]

Hi All !
a lot of time, alignment, setup ... and lots of patience,.
And :

 

[awake]

Wow, great results! I can only imagine the amount of time that took.

 

[Longboy]

An idea takes shape! The engine block....bedrock of all things internal combustion.

 

[Brian Rupnow]

Minh Thanh--Looks good. May the force be with you.---Brian

 

[kuhncw]

Minh Than, You are off to a very good start. You block looks well done.

I'll watching.

Chuck

 

[minh-thanh]

Thank you for your compliments and likes!

Hi All !
a lot of time, alignment, setup ... and lots of patience,...and with one mistake and result :

 

[awake]

Why is it that disaster never strikes until you have already put so much work into a piece, and it is so close to being finished? Or at least, that's the way it works for me!

 

[minh-thanh]

For the first time and many times later, I made crankshaft : I welded the parts together and with pins,
With many cylinder engines I prefer to make crankshaft from one piece
Yes, it is almost completed

 

[minh-thanh]

Hi All !
A little update :

 

[Cogsy]

It's coming along nicely and looking good.

 

[minh-thanh]

Hi All !!
I have a problem, I drill 4 bolt holes ( M3, 0.5 mm )
2 holes on the outside I can make threaded
The other 2 holes, the taps 3mm is too short and too close
so I would like to ask : is there a taps longer ?
If not,I plan to weld 3 mm steel bar to make the thread
Actually I don't want to weld, does anyone have any other solution?
Thanks !

 

[kuhncw]

Do you have a wrench that fits the square on the tap? You might be able to turn the tap a bit at a time. It would be slow, but might work.
If you don't have a wrench, you could put a slot that flits the square in a thin piece of steel.

Chuck

 

[Longboy]

https://www.ebay.com/itm/1PCS-M3-to...hash=item1a8d655851:m:mtkyrGx0ZL4kTiH3H9KaPJw
Or....this is a drill bit extender. You can drill a shank diameter size hole in an 8mm shaft for the tap and secure on the square flats or just its shank with a couple of set/ grub screws.

 

[Cogsy]

It seems you can buy long taps of that size LINK, but I don't know how good the cheap ones will be and the brand name ones get really expensive. I've never done it but it's possible to make a tap from a bolt. Being that this is only for tapping in aluminium, maybe you could make a tap for this one-off job? There's plenty of tutorials on Youtube, etc. but I don't know how difficult it is.

 

[stevehuckss396]

I found the price of the long taps to be " not worth it" so I took a piece of drill rod/silver steel and drilled and reamed a hole in it in the lathe. I put the tap in the tailstock of the lathe in a chuck and gave it a good push to press it in. Think you call that a good sliding fit. Haha!! Then I turned down the diameter of the rod on the tap end to .1875 or something like that to clear the wall next to the hole. I now have a 4-40 tap about a foot long. At least until i need that piece of rod more than i need a foot long tap.

 

[minh-thanh]

Hi All !
kuhncw ,Longboy, Cogsy , stevehuckss396 !
Thanks your comments !!

After reading your comments, plus my memory (I remember a long time ago, I did an extension tool, but it's simple), and this time I did it again but and more care and it worked fine.