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Hi Minh Thanh, In my humble opinion you are 100% on the right track, you look,listen and learn. You are sitting down and trying to work out what may have caused your crank to break. I have been an Engineer for 60 years and I still sometimes make a mistake BUT I still try to learn something new...

Interesting, what exactly was the material that you used?? It almost looks like a shaft was hardened and not enealed.

Hi follow kiwis,I have been a member for a while now. Reside in Napier and have been a toolmaker for almost 60 years but still very active and still try a learn something every day...Have almost completed a EDWARDS 5 radial engine for use in a to be built SKYRAIDER. regards guys Noel.

Mmmm i am finding it to be hard to understand that you believe that you are better to grind to size so why can't you turn to size.

I just have 1 comment to make, WHY grind a piston to size when you can simply turn it to size Piston to bore clearance is NOT important as the rings if made correctly do all the work. All of my rings have a 2 degree angle with the ring face that is in contact with the bore and the reason for...

Hi Ian, interesting thoughts, HSS if ground properly is very sharp and requires little HP to make it work. Carbide is never sharp and removes material by shear friction so carbide is great to use when you have unlimited HP. After 60 years I still prefer to use HSS especially if you unstable job...

Just some interesting thoughts guys..NO diy machinist should ever need to use carbide tips and should learn how to use HSS this way you will eventually understand about cutting angles and how to use HSS to its max. I have been a toolmaker for the last 60 years and as an apprentice was not...

Personally I use 4340 for all of my cranks... It and be a little difficult sometimes to mach but the trade off is its strength.. 316ss for my valves and LM4 bronze for valve and valve followers..O2 for my cam profiles as it tends to work harden over time...I try to use bronze for valve timing...

John, Please take a well deserved pat-on-the-back as you have made a very nice engine and I so hope that it gives you hours of fun and smiles ..A very nice job..

Placing you steel liner in your freezer for 8 hours plus heating the ali it will just fall in....trying to heat the ali in a toaster or in your cooker is simply not hot enough,,,you need to buy a small gas heating torch THEN you will find everything happens so easy.. Keep trying..

Very nice workmanship.

Dave I have been a toolmaker for more than 60 years

Hi guys .I've been using my mitutoyo 0to12inch micks for 60 years and my old boss hated them because the anvils where so slippery compared to his Starrett

Edit, I'm a toolmaker with 60 plus years experience so I am old school. Your workmanship is something to behold and to be admired by all .Thank you for sharing.. Noel Gordon

Nice chat theme guys...Almost finished my Edwards 5 and I plan to install into a 100" Strikemaster using Nick Hi guys, a nice chat thread.. I have almost finished my Edwards 5 and I intend to install in a 100" Strikemaster using Ziroli plans which I now have.. I intend to run my...

60 years as a tool maker one developes a huge knowledge for all aspects of machining all types of materials etc

Lathe Just center the darn thing and then rip a 1/2 drill all the way ,NO need for any silly step drilling

But which is the quicker way to get a good result??

Please guys,,,lets use the KISS principle and simple machine a new one from brass bar, only about 45 min to do.

WOB. just a quick suggestion re the oil ring....just make the oil ring the same as the compression rings but under the oil ring cut an undercut with your ring parting tool about 0.030 deep and drill some 1mm drain holes.. Did you know that the top compression ring contributes 18% to oil...