I have failed tonight, and i have two words to explain why projects fail.
COMPOUNDED ERRORS
Let me explain I intended on knocking out a few brass bushes tonight. (Before anyone says it's for a mamod boiler and there's are also brass).
So I set myself off tonight at the lathe, So off I went to find my brass stock.
Out came a nice 3/8" brass round ready to begin. 4 jaw on the spindle, dial it in. (This is where I should have realised I was fighting a loosing battle). I took half an hour to get the 3/8" bar trued up in two places, so it ran concentric. Then set my tooling up and realised I didn't have a left hand cutting tool that was small enough to get into the recess I wanted to machine. So to the grinder with a blank, (slow process grinding HSS tools) so half hour later onto the wet stone to polish the tip. Then set about centering it in the toolpost. Cue another 30minutes. By this point I thought I was ready, then looked up tapping size for a 1/4" BSF thread. 5.3mm drill required…only have stepped drilled in 0.5mm so tried a 5mm one with the speed on full which should open the hole by at least 0.2mm????? Finally ready I set about it. After an hour and half setting up in a cold shed. Went for tea and to defrost. Then came back to it, and began. Cut a few of them by now then realised I'd forgot to tap the buggers. (Scrap bin), then they were tapped only to realise my hole wasn't deep enough for the tap. Start again on a new one (more scrap). Drill deeper, and try to be clever, by grinding down a tap so it's more of a second/bottom tap, and doesn't need as much depth. This didnt work and it just stripped the thread. (More scrap)
Finally got one to dimentions, drilled and tapped and parted off, tried it on a safety valve, didn't fit, the threads hadn't cut deep enough. (This was due to it binding). Add to that the fact the holes drlled
?Off center, likely due to my tailstock going out of alignment one peed off Jon.
So the grand work of all this playing around is a bush that's scrap! Also around 2" of 3/8" brass that has found its way to the scrap bin through no fault of its own. In hindsight there's a lot of things I would have done differently, only spent an hour outside making sure everything was been setup correctly so I could come to the lathe and make up half a dozen or more easily. The only positive is at least I know where I went wrong for next time.
Here's what it looks like, just ever so slightly mis aligned.

Edited By Jon Cameron on 07/02/2018 23:55:25
Edited By Jon Cameron on 07/02/2018 23:55:48