Maryak 10

[Maryak]

Hi All,

Well here we go again.

I wondered should this be.... "Bore along with Bob" or "Metal Mayhem with Maryak" :

Take your pick.

. As it is my design a running engine at the end will be a real bonus.

For those who have been following the marking out thread, today's effort may have some relevance.

The expensive lumps from which M10 will be attempted.

The setup for marking out, the marking out table is a piece of plate glass.

The end elevation of the drawing transferred to the metal. The profile centre pops are so I don't lose all my hard work when throwing it from bench to lathe to mill and back again.

The cut marks so I can hack off a usable lump.

Hacking off said usable lump.

The bit which I hope will be the crankcase ready for setting up in the lathe.

And that brings me to the end of day 1.

Best Regards
Bob

 

[NickG]

Wow! I don't have the confidence to hack into a lump of metal like that! This is going to be fantastic! How long are you expecting this project to take? That is another problem of mine ... I lose patience!

Anyway, much respect for getting stuck into such a challenging project, I will be definitely be following it, hats off :bow:

Nick

 

[Philjoe5]

Nice going Bob. I like your power hacksaw. I'll be watching for updates on this one.

Cheers,
Phil

 

[Bernd]

I want to know how the green peas enter into this mark out program.

Is that in case you run out of blue dye? You smear the green peas all over and get a green layout dye?

Bernd

 

[Maryak]

Good Morning,

Nick,

Yes you do, just don't walk away during the process and stop when you get to your marks. Due to the angles involved the lump was rotated and reversed to get as close as possible to the cut lines. It was then finished off with a hand hacksaw and finally a hammer and chisel to fracture the last section in the middle still holding on.

Phil,

Yes an oldy but goody, made locally in Adelaide in 1937 it's a Junior version with a 12" blade and a 6" x 6" cut. It was given to me!! A couple of new bushes, new belts and a coat of paint, probably good for another 70 years.

Bernd,

The green peas are an integral part of my operations. They are stand by fuel for my gas torch, (by a round about method), and can be used to good effect to deter unwanted shop visitors by the same circuitous route.


Thanks for your input guys. :bow:
Best Regards
Bob

 

[T70MkIII]

Looking forward to seeing more, Bob.

 

[gjn]

Bob, Can you explain what type of engine this one's going to be?

That's a hefty lump of ally you have there, I went down to Capral to get some stock the other day - obviously I haven't bought aluminium for some time as I almost needed oxygen when they told me the price!

Can't wait to see the progress.

 

[Maryak]

T70MkIII,

A little more shortly

gjn,

I am hopeful it will be another diesel

, 10cc with a front rotary inlet valve. Have a look in http://www.homemodelenginemachinist.com/index.php?topic=3629.0, may give you a better idea.

Thanks Guys for your interest and support.

Best Regards
Bob

 

[Maryak]

As gjn said, "Its a hefty lump of ally"

I found out just how hefty when I set it up. There was a lot of imbalance and it was impossible to run the lathe faster than 200 rpm without it chasing me round the shop.

The good old method of slow down and take bigger cuts sure proved its worth, at 200 rpm the best I felt happy with was 0.060," at 120 rpm 0.125" was a breeze. If you do the sums you'll soon see which removes the most metal in a given time.

Still took a while and this is where I ended up.

The setup

The 1st reduction.

Rest day tomorrow to prepare myself for New Years Eve.

Best Regards
Bob

 

[jack404]

Go Bob!!!

happy new year to you and yours

jack

 

[tel]

Well Bob. I'll give you a 'P' for perseverance, if nothing else ;D

Happy Gnu Yar from me as well

 

[Maryak]

Jack and Tel,

Thanks gents and a Happy New Year

To you and Yours

Best Regards
Bob

 

[Philjoe5]

That looks like an awesome turning job Bob. Bet you're glad it's that far along. Doing two WIP's in a row is worth :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow:

Cheers and happy new year,
Phil

 

[Maryak]

Phil,

Thanks for your support again.

Happy New Year to You and Yours

Best Regards
Bob

 

[Maryak]

Hi All,

Got a lot and a little done today - a lot in the amount of metal removed

- a little in the way of much change in appearance

Gotta say its gunna be quite a large engine - a real beast if it runs.

The second reduction of the output housing of the crankcase.

Parting off to length.

Ready for transfer to the 3 jaw.

More metal removal - Reducing the OD and deriving setting points for the vertical axis.

And that's it until Tuesday.

 

[Maryak]

Hi All,

Another day of metal removal, first from the model and second from the shop -

. I was knee deep in ally swarf.

The crankcase OD reduced to the witness marks + a bee's wing for luck. This gave a little better balance and was able to speed up the lathe one notch to 200 rpm.

A rough guide for the end cover plate boss. (Note the gouge mark where I advanced the tool without paying attention to the X slide position) :wall:

The end cover boss.

Drilling through the crankcase.

The crankcase drilling is complete.

After counterboring for the crankshaft, I think I will tackle some milling next on the outside of the crankcase. As I am machining away, I am starting to think that a jig to hold the crankcase might be a good idea to allow me to hold it more easily and accurately whilst I machine the cylinder and also while I bore out the nose for the crankshaft bushes.

For now it's back to the drawing board to further modify porting etc.

See Ya

 

[T70MkIII]

That's one huge camshaft lobe, Bob. This engine is going to be a monster!

 

[Maryak]

You got it Look good on a V18 Pielstik :big:

Best Regards
Bob

 

[Maryak]

Today saw a bit more progress with the cam lobe (crankcase). : Still removing lots of metal but that's half, (maybe 1/10th) of the fun.

Here's where I'm at

The boring completed.

Finding my centres in the mill.

Ready to fly cut the top of the crankcase

The top of the crankcase after fly cutting.

Hopefully tomorrow will see a heap more metal removed from the sides and the bottom

 

[NickG]

This is looking brilliant, and massive! You sure its only 10cc?!