A Wallaby of my own.

[steamer]

Made some progress tonight    finished the piston fixture and roughed out one piston and faced it to length.   Also finished up my ring groove tool.    Special Thanks to Stevehuck for the help there!

Dave

[b.lindsey]

 The grooving tool looks like it should work well Dave.

Bill

[Art K]

Dave,
The cutter looks great. How different are the inserts from the Arthur Warner HSS ones. would they Fit in the same holder? Maybe A question for Steve.
Art

[Jasonb]

They do work well, I use my Nikcole for all my ring grooves and as a parting tool for small work.

[steamer]

Dave,
The cutter looks great. How different are the inserts from the Arthur Warner HSS ones. would they Fit in the same holder? Maybe A question for Steve.
Art

Not sure Art   Im usually old school grind my own tool kinda guy.   These insert tools are a luxury to me.

Dave

[stevehuckss396]

Not sure. Couldn't find any information on the overall dimensions on the website.

[steamer]

Hi,
the cast iron rings, slotted are held closed with a thin brass thread on a mandrel which has a screwed washer in front of it to tighten one or more rings and keep them closed; the exact outer diameter required is then finished on the lathe as it is generally made;
But before this finishing cut, I give a very slight eccentricity on this mandrel (about 0.1 mm) on the side where the ring are cut to reduce the thickness at this place, what is expected to distribute the compression of the ring evenly over the entire perimeter. I saw this trick on piston rings of vintage engine (10cm3 Micron sparkie engines) and now I try to reproduce it on my own engines !

Hi Zephyrin,

Timoshenko in his "Strength of Materials" Vol 2.....not sure on the publish date, but probably 1930's ,  did a great dissertation on a true even pressure piston ring, and it is exactly like you describe.   Eccentric.   If I can steal a bit of time this weekend, I'll climb into my "Library" and dig it out.

Dave 

[MJM460]

I have that book!

I can’t access it until Thursday, but I can get it out then if still required.

Another classic engineering textbook.

MJM460

[steamer]

I have that book!

I can’t access it until Thursday, but I can get it out then if still required.

Another classic engineering textbook.

MJM460

I have a couple of different editions...my oldest one is the 30's and the latest is late 80's

Dave

[steamer]

New grooving tool works great!   Ill finish off the pistons tomorrow.   .031 wide grooves 0.045 deep   2 rings.

Dave

[MJM460]

My copy of the book was purchased mid sixties.  A bit of a worry that no one is able to improve on such a basic subject over such a long time.  But also a tribute to the Author.

I have a Thermodynamics one, Rogers and Mayhew, that was also used world wide by many generations of engineers.  By the time my son was studying,  a metric text by another author was a welcome variation, but the original is still required for some topics.

MJM460

[steamer]

The pistons are done!    Finishing off the block is next as there are quite a few details left to cut and there is material in the way in various locations that needs clearing out    to do that ive printed out a conrod so i can fit check.    We progress!

[Vixen]

Nice work

Mike

[steamer]

Thanks Mike     time to fuel up! Then back at it.

Dave

[Roger B]

Looking good