The Craftmans Shop > New from Old
Boxford back from the dead
AdeV:
Andrew - I like it, great idea... I could stand it in the urn turned up to 11 to get it all nice and warm too!
Will - good to know, thanks! I was a bit concerned it might eat the metal eventually... but if it makes it better, wow! Cool :headbang:
After a quick trip to the quack, it seems my lower leg isn't about to fall off, so with a bit of luck I'll be bouncing around like Tigger* again soon.
* An old, slightly crippled version of Tigger...!
philf:
--- Quote from: AdeV on June 13, 2019, 04:57:01 PM ---
So - 20dp it is! I shall look to see if I already have a suitable cutter - if not, RDG sell them .....
--- End quote ---
Ade, don't forget the pressure angle. 14 1/2 or 20 degrees.
Pete.:
Boxford is usually 14.5, Denford is 20.
philf:
--- Quote from: Will_D on June 18, 2019, 04:30:23 AM ---Ade, stainless steel loves an acid.
--- End quote ---
It doesn't like hydrochloric!
AdeV:
Phil - good catch on the pressure angle. This leads to a conundrum....
Please see pictures Exhibits "A" and "B": Exhibit "A" is the sliding pulley which either engages directly with the pulleys via drive pins; or engages with the backgear shaft. Exhibit "B" is the backgear shaft. For ease of viewing, I've blown up the relevant parts of each picture. Note that the main gear has "14 PA" stamped on it (the "4" looks more like a "+", I guess it was the apprentice's day on the punches). The backgear shaft, on the other hand, has "20PA" stamped into it!
Now - this IS possibly correct, as the large gear on the backgear shaft is, in fact, a pinned press fit, whereas the small gear is cut into the shaft itself. Either that, or one (or both!) of the gears have been replaced at some point, with the wrong item, perhaps a gear off a later Boxford. We shall never know.
Is there any obvious way to check the pressure angles? The teeth all seem to mesh OK, but I don't really know what I'm looking for.
In other news, I popped the back bearing cup out using a small pin punch and a handy lathe part to tap it with (the hammer wouldn't fit!) As anticipated, almost no force needed, just a few gentle nudges on each side in turn and out she popped. There's no makers mark on the backside, but rather fascinatingly it's had the words SCOTLAND "CARRICK" (in quotes) and a number hand engraved on it. The number is very hard to make out, but after some googling, must be 14274. Looking closely at the front of the bearing again, it also has SCOTLAND and CARRICK (no quotes around it, this time), and a number, but the number's more worn than on the back. Although I can't read it, some googling and searching eBay suggests it must be 14137A, as that pair make up a bearing the exact size of the one I've got (as measured with calipers, so +/- a couple of thou). If anyone can explain, though, why Scotland and Carrick appear to be hand scratched into the bearing, please share!
So... the website I linked to earlier in this thread, with the bearing sizes in it, has led me astray :palm: The rear bearing I have on order has a cup size some 3mm too big; therefore, tomorrow, I will order the correct bearing. If anyone needs the wrong bearing for a Boxford spindle, drop me a line, it's yours for the cost of postage! :lol: (and if it happens to be the right one for your lathe - well, bouquets all round :beer:
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