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saw:
Looking good. :thumbup: :thumbup:

arnoldb:
Thanks chaps :beer:

Anzaniste, pleasure. I can't claim the idea; I picked it up from somewhere; can't remember if it was from an old book or from an Internet link. Angling the groove will work just fine; initially I considered that, but as I keep the toolpost mounted nearly permanently, it's easier for me to have the tool horizontal. It's quick to adjust it in and out for different thicknesses of material, and I just use an oil stone on it in situ to hone up the cutting edge as needed. Saves a lot of time faffing around setting it to center height. Also, I'm a lazy so-and-so, so I use it to part of anything from steel to brass without any change of tool geometry; it does take a bit of care but works...

Yesterday I didn't get anything done as I was shopping around in town and had to attend to some other matters. This morning, I collected the results of said shopping around :D:

That broke the 3-part streak, but at least I got three bits done for today:

First up was a block of phosphor bronze milled to 0.1mm over size on the bearing surfaces for the sliding block and then slit off:

I carefully filed the bearing surfaces flat to remove the toolmarks, and then flat-lapped it on some 600 grit emery to be a good smooth-sliding fit in the tilting guide. Took 10 minutes to machine the block and a good 30 more minutes to finish it off...

Next the eccentric rod; I milled some brass to size for width and depth and left it a couple of mm over-long:

After squaring up, I drilled and reamed the one end, and drilled and tapped the other end.
Then I centered it up in the 4-jaw on the lathe and drilled a tiny hole for tailstock support, and carefully turned it down length-wise. Sorry, no pictures :palm:

A bit of 5mm hex brass was used to turn the "eccentric pin" from; Elmer shows slotted screws for these, but I prefer hex-head screws. Finished bunch 'o bits for the day:

And assembled:

Well, at least it's three more bits done :lol:

:beer:, Arnold

DaveH:
Arnold,

Coming along nicely :thumbup:

DaveH

foozer:
And here I am still dinking around making a base for the Elbow Engine, ah but at least there is your build of it to help answer some of the "How the Hecks?"

Keep up the good work

Robert

madjackghengis:
Looking good, and an interesting order of parts, Arnold. I'm looking forward to seeing it all come together. :beer: Cheers, Jack

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