Author Topic: 20 cc Horizontal 2 Stroke Diesel  (Read 11468 times)

Offline Brendon M

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Re: 20 cc Horizontal 2 Stroke Diesel
« Reply #135 on: April 21, 2017, 12:56:58 AM »
Hello Roger, you sure have been busy!

...All done with CNC (count number of cranks).

I am glad to discover that I have actually been doing CNC this entire time :D
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Offline Roger B

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Re: 20 cc Horizontal 2 Stroke Diesel
« Reply #136 on: April 25, 2017, 07:52:36 PM »
Thank you Brendon  :ThumbsUp:

Next up was an oil tank. This was made from a length of 20mm dia 2mm wall brass tube (a 'trial' cylinder liner from my vertical engine). This is rather thick walled but allowed the connection union to be screwed in.
The base was a piece of 2mm thick brass strip silver soldered in place and then turned to match the tube. The bracket was from the same material this time soft soldered on. A hole for the union was tapped M5x0.5.
The cover was turned from a length of 20mm diameter aluminium. There is a 1.5mm breather hole and the O ring was one from the experiments with an O ring as a piston ring on my vertical engine.
The turning was done using the 4 jaw SC chuck as it is on the lathe for my injection/floating reamer holder experiments.
Best regards

Roger

Offline 90LX_Notch

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Re: 20 cc Horizontal 2 Stroke Diesel
« Reply #137 on: April 26, 2017, 12:14:00 AM »
Roger-

Regarding Pic 470, did you plunge cut with an endmill in your drillpress?   My drillpress would self destruct if I did that.  Your's must be a very rigid machine.

-Bob
Proud Member of MEM

My Engine Videos on YouTube-
http://www.youtube.com/user/Notch90usa/videos

Offline Roger B

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Re: 20 cc Horizontal 2 Stroke Diesel
« Reply #138 on: April 26, 2017, 11:27:50 AM »
Hi Bob,

I have a Chinese 16mm capacity bench drill with the normal amount of play in the quill system. I find that it is generally ok for spotfacing. As this time I had to deal with a step it was done in several stages.

Drill 4.2mm
Spotface with an M4 counterbore (~9mm diameter)
Finish with a 10mm endmill
Open out to 4.5mm
Tap M5x0.5
Best regards

Roger

Offline 90LX_Notch

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Re: 20 cc Horizontal 2 Stroke Diesel
« Reply #139 on: April 26, 2017, 06:30:14 PM »
I see, most of the material was already removed.

-Bob
Proud Member of MEM

My Engine Videos on YouTube-
http://www.youtube.com/user/Notch90usa/videos