Another Comber / Coomber build

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Stilldrillin:
Fine work done well, Arnold! :clap: :clap: :thumbup:

David D

Doc:
Looking good Arnold. The cam ring looks nice I have to laugh at your comment 50% done only 90% to go.
That's how I feel some time during a build.
Keep up the good work!

arnoldb:
Stew, Benni, BC, Kjelle, Eric, David & George - Thanks for checking in Gents :beer:

Benni, like BC said - scouring pads :thumbup:. The ones I use are the green ones available in grocery shops for scrubbing post & pans in the kitchen. I tried some other brands that's available on the shelves, but the genuine 3M Scotchbrite sold in the kitchen section works best for me; I use a lot of them; half in the shop and the rest for scrubbing pots that burned on while I'm posting :D :lol:

George, glad you had a laugh; the 50% done and 90% to go seems to be a sort of a fact while building engines. For me, that's mostly because I tend to start with the easiest-to-make parts, which are normally the biggest. The hardest part of any build is in the handful of small bits; they take more time and setup to make, and trying to get a good finish on those are the hardest. All good fun though :D

I stole an hour in the shop after work today; decided I'll fix up one of the eye-sores...

I removed the big ugly PTFE bushing from the "thin-shaft-side" bearing column, and turned up an aluminium filler piece and smaller PTFE bush, all for press fits:

The PTFE bush I did twice; on the first attempt I turned it's OD 0.02mm under the size needed, and that resulted in too light a fit...

The aluminium insert pressed into the big hole:

After a bit of filing and emery, the joint is nearly invisible:

You can click the photo above to see a bigger version; there it's more visible.

New bush pressed in - intentionally standing 0.5mm proud on either side of the bearing column:

That looks a lot better; in fact, once the flywheel is mounted, the plastic bush will be nearly hidden:

:beer:, Arnold

cfellows:
Coming together very nicely, Arnold.

Chuck

saw:
Nice build, when this engine is finish there is a small chance that I understand this engine :lol:

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