32x40 H Gas Engine

[Brian]

A 3°increase in the angle and the roller diameter increased to 12mm was all that was required to get the timing I require.
still waiting for the material to put this into practise.

Brian

[TomG]

Brian,

How did you determine the timing specs. you were going for?

Tom

[Brian]

Hi Tom.
The timing that I am aiming for is a fairly standard one, giving good torque which is what I want for the lowish speeds that this engine will be running at. adding to that the little bit of desax I have built in should make it pull well. I have plans for this engine as a prime mover. but that's if it all works out.

   

I am trying to get that  (traction engine ) look. with lots of things on the move hence the large cam gear What you cant see yet is the similar spoked wheel on the other end of the cam that will take the small magnet for the ignition timing.

Brian 

[Brian]

WOW??? Am I all behind with this thread

So the next part to make was the ignition timing wheel.  really this is a twin to the cam timing gear without teeth. it will have a small magnet fixed in the rim to operate the ignition ,

   

The arrival of the material got me started on the main shaft for the crank to keep every thing in line. this has to be machined between centres. this has the advantage that you can turn one end.

   

then flip it over and do the other without worrying.

   

The shaft was made .25mm oversize on all dimensions. for starters.
 
The crank webs were roughed out on the lathe and then transferred to the mill to bore the centre.

   

this then allowed me to move 20mm to one side and bore the  hole for the big end pin.

   

doing it this way nothing had to be marked out.

   


The pin to take the big end was made and the shaft bought to size then a trial assembly done.


   

This will be put to one side while I make the flywheels.

Phew up to date.

Brian.  

[Brian]

So I have a 5" dia lump of steel that don't fit in any chuck that I have for my 7x12 so the answer is to mill out a channel on the rotary table that the chuck can grip.

   

now on to the 4 jaw to grip internally and centre the work, then make a blank flywheel.

   

Then it's back to the mill and drill out the corner holes for the spokes.

   

 after that it's a game of join the dots.

   

   

Until we have two fly wheels.

   

Now that looks better.

   

Onwards and upwards, Brian

[Bill Gruby]

Brian;

Your work as always is over the top. Nice, very nice.

"Billy G"

[TomG]

Flywheels. Now it's starting to look like an engine!

I always enjoy your resourcefulness when it comes to fixturing.

Tom

[DaveH]

Nice work Brian  
You really joined up those dots nicely  
 
DaveH

[Brian]

Just had to get the crank in to see if it's all OK
   

   

Brian.

[Brian]

Made a start on the big end bearing ,
I have never made a split shell bearing so this is well outside my comfort zone.

first job was to split the material in half on the mill using the slitting saw.

   

Then solder the two parts back together again.

   

I then turned the max  OD this will be the size across the side thrust flanges, then bored the bearing bore, my boring bar was to large for this job so I used the mill boring head in the tail stock.

   

More later I am getting twitchy.

Brian.