Member postings for Steve Veness

Thanks for the replies. I have ordered the gears from China - delivery in 4 to 6 weeks.

I ordered 10 x Mod 1 20T in carbon steel for £19.70 inc delivery - can't really see how they do them for that.

@Old Mart - The differential case will be fully sealed apart from shafts running in bronze bushes to drive the two axles.

I'll post some updates when they arrive.

Hi there,

title says it all really. I need to construct a small spur gear differential for an off-road wheelchair project. Something like the picture below. Gear speeds will be generally very low, since when the wheelchair is going straight the whole differential unit turns and the gears stay stationary relative to one another.

I need at least 6 spur gears and I am trying to keep the costs down, so I was thinking of trying some of these from eBay:

Link Removed see CofC

No doubt they will not be very precise or hard wearing but as the relative movement will be slow and limited (and as this is a prototype) I thought I might do better spending £20 or so on these than £70-80 on some UK sourced gears (which are probably made in China anyway.

Any thoughts / suggestions?

Thanks

A spur gear differential:

Edited By Steve Veness on 17/09/2020 10:07:26

Edited By JasonB on 17/09/2020 10:34:22

Haha 55, so i'll start saving to buy another lathe in 25 years time!

Ok many thanks everyone for all the comments and advice. Interesting that the Spindle gear is attracting more comments than the original gearbox problem! But that could be because it's a potentially more serious issue, I guess.

I'm sorry that the photo is not very good I've posted the other one I have below which might be better but any further more focused photos will have to wait until the weekend when I am back home with the lathe.

However, just to be clear, none of the teeth on the main spindle gear are missing its just that they are quite worn. I think the original photo makes them look worse than they actually are, so I am quite hopeful that it is not terminal.

For my part, it's quite clear that the lathe has had a hard life - I assume in a school - but I would guess that the gearbox issue resulted from trying to change gear when the lathe was running and the idler gear was similarly damaged by someone trying to reverse whilst the spindle was running

Prior to finding a problem with some of the gears in the gearbox I did have the lathe happily running power feed in both directions and screw cutting feed albeit not under load.

Anyway, here's the other photo (oops it's gone in above!). As ever any advice gratefully received!

I have dismantled the gearbox and found the cause of my troubles. I have included a photograph of the middle 16t gear (pn 292) which is missing 7 teeth. I have emailed John Ward to see how much a new gear will be.

Thanks Martin  and Robbo... all good advice, and things I might not have thought about tbh, so much appreciated.

It will have to be next weekend's job now as I'm off to the big smoke for another week selling my soul for fitlhy lucre (aka paying the mortgage) but it feels like I should be able to make good progress come Saturday!

Thanks

Steve

Edited By Steve Veness on 28/02/2016 22:14:38

ok thanks John... once the shaft's out I'll give him a call. Cheers

Thanks guys, got the gearbox off ok and found the cause of the problem... half the teeth missing on the middle 16t gear (partno 292) on the intermediate shaft. I say 16t gear but sadly it's now more like an 8t gear lol!. Could only find 3 of the broken teeth so I assume it's been a gradual process of destruction.

Looks like it's going to be a long and expensive process to fix. Hey ho - wish I'd bought a model B now and stuck to changewheels for screwcutting.

I can't see how to get the intermediat shaft out - does it just drive out from the headstock end? There's a central boss or bush on the intermediate shaft but it appears to be pinned with a blind pin rather than a removalble grub screw. (You can also see it in your photo Martin) . Any ideas?

Thanks

Steve

If anyone else needs to do this, this video link was posted on the Boxford Yahoo group. It's for another SOuth Bend clone but mechanically the same. Quite helpful for a novice like me.

https://www.youtube.com/watch?v=w5CuDdhdess or google on "tubalcain logan lathe #130"

The guy doing the video has a nice style too

Hi,

I'm a newbie so apologies if this is all a bit basic or covered elsewhere. I should say I have posted this request on the Boxford Yahoo user group too, but no response there yet...

I have just become the proud owner a 1956 (? serial number DEH3656/A/5352) Boxford A. It's in need of a bit of TLC. Basically I am looking for some advice on strip-down and re-building the screwcutting gearbox.

After a few checks that everything moved freely I plucked up courage and started it up with nothing in the chuck. All seemed fine, initially forward, reverse, power feeds working ok screwcutting moved the apron at what seemed like a reasonable rate.

Then I tried changing the gearbox and with the lathe stopped) two things happened:

First the left lever jumped out of any of the 'top' positions (A, C or E). Then, more worryingly, the gear lever shaft (part no 303 I think) migrated to the left and dropped out of its righthand bearing - then everyting stopped. I switched off quickly, and was able to jiggle the gear level shaft back into place but when I checked to see if everything will rotate by hand it moves a few turns of the chuck in each direction before going no further (and I didnt want to force it). Switching the reverse lever to the neutral position allows the spindle to turn freely again but all is clearly not well in screwcutting-gearbox land.

I could probably guess intuitively how to dismantle the gearbox and reassemble but is there anything I should be vary of?

Nothing went seriously crunch so I am hoping any damage is very limited.

Thanks

Steve