| Gallery, Projects and General > Project Logs |
| Another new project... a QCTP (Quick Change Toolpost) |
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| Brass_Machine:
Ade, It's looking good! That is going to be one QCTP you can be very proud of. Eric |
| AdeV:
I hope so Eric, it's certainly taking long enough! :lol: Speaking of which.... a nice long day in the workshop, albeit with a couple of trips out to break the day up a bit... First, I thought I'd show you the results of my draw filing efforts... Here's what we started with, at about midday: Plenty of marks, pits, ridges & so forth. After about 1/2 hour - with the occasional pause to wipe my fevered brow, it's surprisingly sweaty work this draw filing business - with the coarse file, here's where we're up to: Almost there, just a few bits at the bottom middle, and some faint lines where the file dug in - then bounced, damnit, all the way down the left hand side of the block. Another ~30 mins of effort, first with the fine file, then with some 120-grit wet&dry (with cutting oil lube): As you can see, there's still one mar left, but life is too short, I'd still be filing that out now... Repeat the above for the top edge, then a quick skim of the dovetails, and it's time to move on... First, I parted off a chunk of my super-expensive Aluminium Bronze - the piece in the picture represents just under £10's worth of metal (2.25" diameter). This was a bit of a bum-puckering task, the first time I've parted anything off under power. Not realising just how tough this metal is, I just plunged in with my sticky-outiest HSS parting tool. It smoked like mad, but cut cleanly, turning about £1 of metal into swarf... Next, onto the mill to convert it into a square. Man this stuff is tough, mild steel is a doddle by comparison. Max depth of cut: 0.025" per pass; lucky I'm not building the body out of this stuff, I'd be there forever! Anyway, once it was cut square and to dimensions, and the top/bottom edges skimmed to flat, it's time to radius the corners: You can see where I got over-confident and ballsed up the first one, I went 0.025" too deep with the cutter. It's 1/4" radius, not 1/2"! :doh: Soon: As usual, I've not got anywhere near as far as I'd hoped (I was hoping to have both pistons finished & to have made a start on the base, but, no such luck). So anyway, here's a couple of glamour shots: The piston currently sticks out about 0.113" when it should really be flush; so that's a job for tomorrow. Maximum movement for 1 rotation of the cam is about 0.150", plenty I reckon. What I'd call "normal" movement (i.e. handle fully back to handle where I'd expect it to be) is about 0.050", that should be OK, so long as I can make my toolholders fairly accurately. And what post would be complete without an arse shot? :lol: Looks good, though, doesn't it? Even if I do say so myself.... |
| Rob.Wilson:
I would say so to Ade ,,,,,,,,,,, very nice :clap: :clap: :clap: :thumbup: We all day days were we dont get as much done as we thought we would :doh: Rob :thumbup: |
| raynerd:
Looking bloody brill!! Well impressed!! :bow: :ddb: |
| Trion:
Still looking very impressing, I'm looking forward to seeing it mounted on the lathe! :thumbup: |
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