Junkers CLM

[Admiral_dk]

You have made quite a number of parts since my last comment -> good to see the great progress 

How much is missing before you can see the pistons going up and down in a trial assembly ?

Per

[Vixen]

Hello Roger,

The top yoke looks rather nice. Always good to see the (almost) finished item

Mike

[cnr6400]

 

[Roger B]

Thank you 

Per, it just needs the pistons and gudgeon pins although I should put another side on the crankase to keep things square.

[Roger B]

The holes for the gear shafts were bored 4.5mm and then reamed 5 mm. Although I had marked out the positions the spacing was set using the milling machine. After a quick sanity check the inlet and outlet ports were drilled a little deeper that the gear cavities will be. To maintain the positions when boring the cavities I used a stub mandrel held in an MT collet. The body was then located on the stub mandrel and clamped to the face plate.

[Roger B]

The bulk of the material was removed with a 10mm end mill and the final boring was done using a 6mm three flute end as a boring bar. The two end cavities were finished first followed by the centre cavity.

I then moved over to the Proxxon lathe to cut a 6mm Oilite bush to length. This was supported on a length of 6mm silver steel held in the tailstock chuck.

[Roger B]

Next I needed to open out the centre shaft hole for the bearing bush. The stub mandrel was released and pushed back into the collet then the hole was opened out with a 9mm drill. The hole was bored out to around 9.5mm to ensure concentricity and then reamed 10mm. The body was then removed from the lathe and the bearing bush was pressed in place. The 5mm stub mandrel was replaced with a 6mm one and the body was refitted to the face plate to allow the bush to be faced to length. A quick trial assembly and the gears all turn smoothly 

[RReid]

final boring was done using a 6mm three flute end as a boring bar.

Another useful idea to file away for future use.
The pump is coming along great!

[Kim]

Very nice little pump, Roger!  It's coming along beautifully! 

Kim