"A Beginners Engine" From Model Engineer.

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DavidA:
ParCan,

It's a bit late now, but I missed the thread.

Sash weights are often chilled. I once bought a sash weight for a job and had to give up on it as it was too hard.

Sorry for not noticing earlier.

Dave.

krv3000:
Looking good Alex.

ParCan:
Eccentrics today have not gone well.

I decided to make a steel inner and Brass strap.
The only suitable steel I had started out at 2" dia. A few passes of a roughing tool sorted that ...

I turned the 20 mm X6 deep shoulder.
Out came the Parting tool which really struggled in the std tool post.
Decided to try the rear parting post for the first time and I have to say it worked a treat on the 1st bit.

And I parted it off all the way.

Moved 1 jaw of the 4 jaw 3.5 mm measured with a drill.
Pushed the work across, Double checked the 3.5 mm offset and centre drilled it.
Then I looked at the first part which was missing said 8mm hole :doh:

Turned the 2nd bit and then tried to part that off.
Tool post was hitting the chuck so took that off.
Then the jaws were hitting the Saddle (by quite a margin.)
Had to move the tool post as far as I dare off the side off the cross slide.

Carried on and hacked my way around the missing hole issue....
I superglued the 2 bits together back to back. Centred them on the mill. Centre drilled the 2nd part, then reamed them both to 8mm.

As I have some tiny M2.5 grub screws I decided to grub screw both bits.
The Eccentric strap was a simple turning and boring job and has come out really nicely.

sbwhart:
When parting off Alex don't be afraid to resort to the Mk1 parting tool:--- the good old hacksaw:- we all resort to it if we were honest :headbang:

Looking good I recon at this rate we will be seeing a video of the running engine soon :whip:

Stew

NickG:
Yeah good progress there alex, the con rod and eccentric look good.
I had trouble with the crank too i may have to re-make. The trouble was i had to turn down to 8mm and the 8mm end mill gave me a good fit on the bearings didnt on the webs for some reason! Had i realised i had a 5/16" reamer i would have made it that size instead. i might use grub screws rather than pins if i make another But if i can get away with fixing the existing one i will do that as it took ages!

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