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| Bog's Paddleduck Engine |
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| bogstandard:
You don't need to use large mountings, anything just to hold the blocks in position so they can do their job of supporting the crankshaft. Even tiny screws would have enough strength to hold them in position. It will be the same for any fixings that hold pieces together, they don't have to be large just for the sake of being at the same scale. Use what you have. Bogs |
| kvom:
Thanks, John. |
| Brass_Machine:
It's getting there. This is a nice build to watch! Eric |
| kvom:
My first goal of the afternoon was to finish milling the second crosshead. I did it in a different sequence, and although it required an extra reclamp in the vise, I was able to clamp solidly against the jaws more often. The first operation was to expose the conrod bracket (three cuts in one vise position): Then two cuts on the "cheeks": Afterwards it was just the cross cut on the Y-axis and milling the slot. After patting myself on the back and enjoying a soft drink, I drilled and tapped the bearing blocks. There was just enough room for the 5-40 screws. Right now the bores are a tight fit on some 1/4" drill rod that I lapped with some fine sandpaper. I need to do the same thing with a longer piece to lap out the bores and align the blocks precisely on the plate, as shown in John's writeup. I'd like to get the base cutouts done next so that I can trial fit the eccentrics and cranks. |
| bogstandard:
Kvom, The crossheads are the most difficult part to machine because of all the operation and position changes that needed to be done. Now you have got those out of the way, most other jobs should be plain sailing for you. Very nicely done. John |
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