The "Little Pearl" Single Cylinder Marine Engine

[b.lindsey]

Thanks Kim. There is a LOT more work needed on the cylinder...it will be a multi step process for sure.

Bill

[bent]

Looking more cylindrical every day!

[zeeprogrammer]

Drumming fingers here. Something about a family shot. 

[b.lindsey]

Maybe by the weekend Zee, but not promising, or put another way ....some weekend soon. Depends on how busy work is this week. 

Bill

[zeeprogrammer]

Maybe by the weekend Zee, but not promising, or put another way ....some weekend soon. Depends on how busy work is this week. 

Good grief. You sound like Chris. 

[crueby]

Maybe by the weekend Zee, but not promising, or put another way ....some weekend soon. Depends on how busy work is this week. 

Good grief. You sound like Chris. 

I resemble that remark! Or I will, maybe later, plans are changing. I think...   


 

Chris

[b.lindsey]

We learned from the best Zee 

Bill

[b.lindsey]

Not as much progress as I had hopped for this weekend but got closer to finishing one of the eccentric straps. After milling the "ears" to the needed top to bottom distance on both sides (photo 1) and making the four screws to join them (photo 2), it  was off to the rotary table to round the outside to the needed diameter (photo 3). As you can see in photo 4, rounding the upper quadrants required cutting into the head of the screws a bit, so they will all need to be remade but that is not big thing. With that done, the width dimention of the "ears" was narrowed again on the rotary table (photo 5). In photo 6 you can see the difference in this strap vs. the one not done yet. Finally, the top of the strap was machined round as shown in photo 6. I still need to finish the height of this and drill and tap 10-32 for the eccentric rod. Once this is done, the same  steps need to be done on the second strap, but I have the procedure down now at least so it should go faster. Both straps will still need an oil hold added as well, and the eccentric hubs need to be drilled and tapped for set screws. The cylinder is too large to hold in the Sherline mill vise so further work on it will be done at work. I am also hoping to get the base plate drilled/bored/reamed for the crank bearings. Again that will need to be done at work.

Bill

[Dave Otto]

Nice progress Bill!

Dave

[crueby]

Nice details on the straps, taking that cut on the side adds a lot.

 

[b.lindsey]

Thanks Dave. It wasn't as much as I had hoped but these eccentric straps have been rather fiddly and aren't my favorite parts to work on, but they must be done, and I am happy with the results so far. Going back to the castings, there was a lot to be removed to get to this point.

Bill

[10KPete]

The 'extra' work really makes a difference in looks. And it looks great!!

Pete

[b.lindsey]

Thanks Chris and Pete, I was typing as you guys posted.

Bill

[zeeprogrammer]

Nice shot using the parallels to hold that part.
That wouldn't have occurred to a lot of people (like me).

 

[b.lindsey]

Glad you pointed that out Zee. As it turned out, they were a bit springy and after a close call I replaced them with two 1/4" square tool blanks which were more rigid. The other thing was that since I was only holding one half of the strap, there was a tendency for the legs to be pressed inward as the bronze is somewhat soft. Using the live center helped. The best set-up would have been to chuck the entire strap with the two halves joined but in my case the depth of the jaws was not sufficient to do that. Long story short, it worked, but required very light cuts, so I would not recommend it. I was lucky I didn't kill the part perhaps.

Bill