Poppin Engine build.

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ian_in_the_midlands:
A bit more progress today. The second pair of holes were drilled and reamed on the crank. I couldn't align the bars together in the lathe so had to use the drill press. Took ages to get everything right, but everything looks parallel and square. Back on the lathe to radius the ends and turn to length. I was careful to use very light cuts for this one.
Finally a quick rub on a coarse diamond stone to remove the chuck marks, and parts are put together while I decide how I am going to fix them.

ian_in_the_midlands:
I now need to decide if I am going to threadlock and pin or silver solder the crank together.

If I go with threadlock and pins, is the grade of theadlock important, or will any do?

As I have not silver soldered before, I thought it prudent to do a practice bit first.

3 holes drilled and reamed in some key steel.
1 left like that, 1 chamfered, and the third chamfered with some grooves filed to help the solder to wick up.

I will see what I can do tomorrow

Stilldrillin:
Ian.
I prefer Loctite 270, (any will do, I guess), plus 1mm dia cross pin.

Have a look here. About half way down the page....... http://madmodder.net/index.php/topic,8821.0.html

The m2 grub screw, locating into a dimple. Allows dismantling, and accurate re-assembly.

Still going strong! :thumbup:

David D

dawesy:
Coming along nicely :)

ian_in_the_midlands:
My first attempt at silver soldering was not good.
I has trouble getting the solder to melt and flow.
I had carefully cleaned and degreased so suspect I had not used enough flux.
3 pictures below are the results after a rub on the diamond stone, the results after a savage attack with a hammer, and a shot from behind showing the solder had wicked through the filed slots.

Although the first two pins did fail eventually, they took some abuse before they gave. I can see little or no evidence of solder, but surely the oxide can not hold that hard?

The third joint held firm, but does not look very good as the solder had not flowed around the chamfer.

Loctite 2700 and 1mm steel for pins have been ordered.

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