The Craftmans Shop > New from Old
Boxford back from the dead
AdeV:
Just a brief update tonight: Having now taken delivery of a second small pin spanner - I'd bought a small and a medium, but the pin on the medium didn't come close to fitting in the holes - I went to take the spindle lock nut off. And the small pins didn't really fit in the holes either :palm: Must be metric pin spanners (4mm pin) and imperial holes (0.150" or thereabouts). That's about 3.75mm... Damn! However, I could get just enough purchase to unstick the two nuts from each other, thank goodness. The spindle then popped right out without any drama at all.
Pic 53 shows the various parts, pic 54 the now empty and more-or-less clean headstock.
The front bearing looks perfect, even the cup is clean and so smooth the camera couldn't auto-focus on it (pic 55). The rear bearing, however, is a different story - pic 56 & 57. You can see it's had some kind of a bash - indeed, all the rollers fell out when I tried to clean the grease off it. I was lucky not to lose one down the plughole of the sink :lol: So I'll need to replace the rear bearing, and since I may as well do the outer cup as well, I need to figure out how to remove that. I believe it's a very light press fit, but I need to go read up on it before I tackle that. Also I need to find out what bearing it is, of course! The lathes.co.uk website suggested a fancy Timken bearing, but this one has no discernible maker's marks on it. I guess Boxford bearings aren't hard to find, and I believe they used the same size for every 4 1/2" lathe from start to finish. Everything else looks pretty OK. The pulleys need a good clean up, and the spindle has some rust internally which is a bit tedious - I might try some of this rust removing liquid you can buy (MC51), which various Youtubers use in their restorations & seems to do a spectacular job.
So that's it for tonight. Pretty much the last bit to take apart is the saddle/slides; then I can start looking at sourcing/making the few replacement bits I need to do, start welding the foot, and that motor/pulley plate. Hopefully the leadscrew, handwheels and various other bits will be done pickling by the weekend, and I can give them a clean up & check for excessive wear.
Thanks for following along - and all comments (even ones questioning my sanity :headbang:), suggestions and hints/tips gratefully received!
Sea.dog:
I seem to be having trouble posting some info on here, it doesn't seem to want to accept my attachments.
The outer race is removed from inside the casting. There are two small diametrically opposed holes that you can put a pin punch through to remove the outer race . I'll let you have the bearing details later.
AdeV:
Hi Seadog,
I found a really helpful post on www.model-engineer.co.uk, which also mentions the pin punch holes, thanks! It also gave me the bearing codes - weirdly the back one is a metric bearing, the front one imperial... which seems odd... but it means I can get an SKF bearing for about a tenner. So that's nice.
AdeV:
I had a bit of a rest yesterday, on account I've knackered my knee, but since resting it hasn't made the blindest bit of difference, I may as well press on regardless. :whip:
Anyway, so I decided to measure up the apron handwheel pinion yesterday, as I'll have to make a new one. Or buy one, but they're £silly money, and it's not like I haven't got the machinery to do the job... the only thing I might need to do is buy an appropriate involute cutter (or make a hob... hmmm... :proj:).
Given that this is a 1948 machine, long before the European Union was invented, and not long after the French discovered the Metric system, I figured this was *bound* to be an imperial gear - doubly so because this is a copy of an American lathe, and they've yet to discover Metric even now... so out comes the calipers. 0.810" ish OD (bear in mind, this has some wear on it), RD is about 0.570" (IIRC - I'm on a train and don't have my notes with me), and has 14 teeth. But.... none of the imperial sizes really come close. At 19.5 DP the OD is too small, and at 20.0DP the RD is too big...
So, with some trepidation, I switched my computer over to French..... and sure enough, it appears to be a 1.25 modulus metric gear! :scratch:
So, before I rush out and buy a $5 Chinese-made mod 1.25 cutter of the appropriate number - does that seem likely? I can't imagine I have one of those already, given all my involute gear cutters have come from auctions of "random stuff" over the years.
I figured if I measured the spur gear that the pinion drove (which also appears a lot less worn) I'd have my answer, but I remember now it's lurking at the bottom of a barrel of citric acid, hopefully getting shiny, clean and lemon fresh. :thumbup:
Anyway, that's todays question for any Boxford experts (Seadog :bow:).
Pete.:
It will be 20DP. There's an adjustment for small tooth count pinions in fact I just recently made a handwheel pinion for someone which was 14DP but worked out 13.something. Let me find the details....
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version