I gotta make some gauge frame bits for the railway's S160s. There's a bunch of parts, but I decided to start on the one that I think'll be the most difficult.
It's just a nut 7/8" thick, threaded 7/8" x 14 BSP, but here's the thing: there's a central recess to thread O/D, and on one side of the recess it's RH thread and on t'other it's LH. Think I'll scewcut it with manual rotation – can't see how I'd dare do it under power.
But I'm not there yet. 1.67" hexagon LG2 is – as far as I know – effectively unobtainable, so I've had to turn 2 1/4" round bar down to the across-corners size of ~1.928", then mill the hex flats.
That's when I found out the divvy head tailstock on the Bridgy clone (a) didn't belong originally to that divvy head, (b) can have its barrel nodded up and down, and (c) was 17 thou off the right CH at the end of my bar, set by persons unknown for reasons unknown.
So I had to faff about for about an hour and a half to fiddle it right and parallel within about 5 thou end-to-end.
So I've now cut the hexagon and sliced it for the nuts.
Next week face to length and chamfer, drill, bore to root diameter, recess to thread OD and screwcut.
I'm just glad I'm not doing this for pay.
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Oh, the vice ain't doin' nuffin' – I just didn't wanna shift it.
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