The Craftmans Shop > New from Old
Boxford back from the dead
AdeV:
--- Quote from: Pete. on June 25, 2019, 03:04:11 PM ---If you're making a 4.5" gear from raw cast bar stock you'll need to start with a 5" bar anyway. The outer crust can be quite thick and you won't want to be cutting teeth in it.
--- End quote ---
Good to know, thanks. I was going to buy 50mm bar for the spur gear (which is as good as 1.625" OD, or a shade over 41mm), suitable do you think?
I snuck down to the workshop today for half an hour (have car, will travel... but my knee is basically better now, so I won't have an excuse to drive to the railway station for much longer), so I cut the hex into the end piece, and using a fairly coarse file, cut a bit of a dome in the end. The belt sander tidied up the worst of the machine marks on the faces, so I brought it home and had a go at polishing it :D OK... I need to do more work on getting rid of the cutting marks, this was just playing around really. It still came out nice and shiny, which is what I'm looking for. Mmmmm. Shiny.
Now.... do I gold plate it for the "black and gold" colour theme.....? :lol:
AdeV:
:doh: I just realised I'd got the old bit here too, and the part it fits in. And as we know:
:worthless:
So may I present: Old vs. new; old in the mating part; new in the mating part :thumbup:
I still need to drill the handle hole (should be straightforward enough), and the hole for the grub screw. The latter will wait until I've got the shaft finished, so I can be sure the end of the grub screw fits perfectly. Also note, I've made the hex a bit bigger - 3/4" instead of 11/16". I can never find my 11/16" spanner... but 3/4" = 19mm = loads of them kicking around the place :lol:
AdeV:
Things have been a bit quiet on the Boxford front the last few days; I found myself short of tooling... After several abortive attempts to cut a thread using a brazed carbide tool (chipped the end off), an insert (wouldn't go deep enough, and I'm 99.9% sure it was a 60 degree bit anyway), I did finally get some success with a ready-cut HSS tool I found buried at the back of a box of HSS bits somewhere. I think it's 55 degree, but it's hard to be certain. There's not a lot in it, and my eyes aren't what they used to be. If anyone has an easy way to determine a 55 degree vs. 60 degree cutting tool, speak now... So... more on the threading tomorrow, when I hopefully finish off the belt adjustment shaft.
Meanwhile, a set of polishing wheels/polish had showed up, and yesterday a fine selection of wet & dry paper in various grits (all the way up to 3000!) appeared; so tonight I called in at the workshop for a bit of messing about. Basically, I wasn't happy with the finish on the adjuster collet thingy, so I chucked it up in the lathe, and filed away the worst of the indentations. Then I used progressively less aggressive emery cloth - 80 to start, then 120, then 240, followed by some 400 grit W&D, finishing off with 1000 grit. I did the same with the adjuster nut/handle holder thingy, although I've not yet done the flats (I'll drill it first).
Finally, when I got back home, I gave it a 2 stage polish on the hard cloth wheel & then the soft floppy wheel, with the two grades of polish which came in the kit.
I think they came out rather nice. If you look really closely, there's still a few scratches left from the sanding (they may not be that visible in the photos)... but they'll do for me, for now :thumbup:
Sea.dog:
You need one of these, Ade.
AdeV:
I do have a fishplate (somewhere - can't put my hand on it right now....), but I find even that difficult to use, especially if the tip of the tool is small. Hm, I wonder if one of those digital protractors would do the job.... Now, where did I put my Amazon catalog? :scratch: :lol:
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