Half Nut Fix, South Bend 13 (part 7)

The half nuts on my south bend lathe had seen better days, to be honest they were well and truly munted. So, I set about making a repair that would allow the threads to be replaced, as and when the need arises. I hope you enjoy the Video
I had hoped to assemble the apron and get these half nuts up and running, but there is another problem that needs more attention in amongst the gears. The issue is with the sliding worm gear, it is held in place by two bushes, it in turn slides along the lead screw along the keyway, this in turn is held inplace by two threaded locking rings, these rings have worn the bushes to such an extent that they have buried themselves into the bushes in turn require replacement.

[@frankward709]

Excellent Thanks for the video

[@Thesheddweller]

Hi, thank you , you’re welcome. cheers.

[@TheKnacklersWorkshop]

Hello Paul, Don't you love it when a cunning plan come together... nicely done. Enjoyable viewing, thank you. Take care. Paul,,

[@Thesheddweller]

Hi Paul, yeah Its great, I’ve just got to get the next bit done now. cheers

[@debike3077]

Job well done.👍

[@Thesheddweller]

Hi. Thanks

[@alasdairhamilton1574]

Nicely done😃 👍🏴󠁧󠁢󠁳󠁣󠁴󠁿

[@Thesheddweller]

Hi, thank you. cheers

[@williamsworkshopuk]

This is fast becoming my favourite channel - thank you so much for taking the time to upload these videos with the wonderful commentary!

[@Thesheddweller]

Hi, thanks for your comments. Now I really have to raise the bar…. regards

[@dizzolve]

What a complex little project. Enjoyed the content thx

[@Thesheddweller]

Hi, thanks, glad you enjoyed.

[@davidmott2090]

Your 4-jaw chuck assembly is brilliant, love it.

[@Thesheddweller]

Hi, i made a video of it, if you’ve not seen it. cheers

[@craftycri]

BRILLIANT!!!! What a joy!!!

[@LetsRogerThat]

Paul you had my head hurting trying to keep up for a bit. Haha. Great job on this. I've got a 1944 SB13 and my threading operations result in slightly lopsided threads, which means my half nut has some wear and should probably be refurbished at some point. I rebuilt my lathe last year and it didn't look too bad, but I think it will have to make the project list this year. At least now, I have an example to follow. Cheers, Gilles

[@Thesheddweller]

Hi, I’m glad you enjoyed the video. cheers

[@RustyInventions-wz6ir]

Very nice work. My half nuts is also worn. However I’m going to fit new ones. I’m not on your level of skill yet.

[@lecnac855]

When all said and done very clever approach to the problem of process. Well done as usual.

[@Thesheddweller]

Hi, thanks.

[@graedonmunro1793]

that's a really clever well thought out fix and it works!

[@Thesheddweller]

Hi, sorry i didn't reply, I missed your comment. Many thanks,. Cheers

[@Andrew_Fernie]

Very nicely done.

[@Thesheddweller]

Hi, thank you. cheers

[@humanistwriting5477]

Been looking forward to seeing your process fixing the half-nuts, and even then I'm 2 days late to the show! Good show and good idea making liners! It's always great to see another person's process and yours is very creative and cunning!

[@Thesheddweller]

Hi, glad I didn’t disappoint, regards

[@buckw65]

Very interesting

[@Thesheddweller]

thank you

[@chrislee7817]

What a lot of work you are having to do! I hope my old Hardinge never needs this level of work.

[@Thesheddweller]

Hi, it looks like a lot of work, but apart from the bed ways and the straight edges it isn’t too much work for a lathe that cost next to nothing.. cheers

[@captainraypaul4919]

Great job Paul! I would think the extra holes would actually benefit in the lubrication aspect.

[@Thesheddweller]

Hi, i’m counting on it, cheers

[@philhermetic]

A well thought out and brilliantly executed repair, why weren't all halfnuts made that way? Phil

[@Thesheddweller]

Hi, its all down to cost I’m afraid. cheers.

[@JETHO321]

What a genius solution!

[@Thesheddweller]

Hi, thank you.

[@4GSR]

Could not of done it any better my self! Nice job sir! Thanks for sharing, Ken

[@Thesheddweller]

Hi, thanks you’re welcome cheers

[@TheAyrCaveShop]

Wow Paul, Fantastic repair...you put in a lot of thought and planning. Great solution and results !! ATB....Dean

[@Thesheddweller]

Hi Dean, thank you, not much more left to do now. cheers.

[@VanFlausch]

You done a great Job on these Parts.

[@Thesheddweller]

Hi, thank you, Cheers.

[@tonyray91]

Nice job Pau

[@Thesheddweller]

Hi Tony, thank you. not much more to do on this lathe. cheers.

[@HanstheTraffer]

Absolutely brilliant. Your problem solving is marvelous.

[@Thesheddweller]

Hi Hans, Ive had a life time of problem solving mainly because the drawing office kept breaking pencils until they got computers, then they went metric and cocked everything up. cheers

[@lesmo9627]

Quality work as always Paul 👌

[@Thesheddweller]

Hi, thanks

[@zakishahane2275]

Very informativ video 🙏😍

[@Thesheddweller]

Hi, thank you.

[@be007]

i really like the way how you fixing things mr hopewell, you are a true metal professor ! i was wondering, why aluminium and not brass ? thanks for the vid, cheers ben.

[@Thesheddweller]

Hi, I once used to fly microlight aircraft and one part had to be replaced every year… this part was commonly called the 'Jesus bolt’ believe me if it malfunctioned thats all you have got time to say before your demise.. The thing is the bolt was made of certified hi-quality steel. This bolt passed through an aluminium bracket that never seemed to wear. One of my aircraft had several bolts replaced but the aluminium bracket was still faultless and showed no sign of weakness or excessive wear. The aluminium I used is very good quality material almost aircraft grade in the way that it cut. So I’m expecting great things from this repair…. on the other hand.. regards

[@Bob-gc4rc]

​@@Thesheddweller Hi, love your channel. Have you considered that your jesus bolts could have been wearing out before the aluminium bush due to it acting like a lap? The softer metal getting grit or harder particles embedded in it and then wearing away the steel bolt.

[@Bob-gc4rc]

​@@ThesheddwellerYou might want to keep a close eye on your lead screw for wear.

[@Thesheddweller]

@@Bob-gc4rc Hi, thats exactly what was happening, and it was easier to replace a bolt than the entire suspension bracketry. It’ll be interesting to see what happends on the lathe after a bit of use. Cheers.

[@Kevin-gx8lc]

Wow Paul, that's a really good solution, well thought out and brilliantly executed. Very well done Sir! I think the aluminium will work ok - leadscrews don't move very fast and I wonder if another benefit of those additional holes from a previous project, might actually help with lubrication? I wonder if you could set up an oil dripper (as found on the Myford ML7) to make sure that the aluminium gets proper and permanent oiling. Excellent work... take a pay rise and an extra two weeks holiday... tell the boss that I said it was ok! Greetings from Southport.

[@Thesheddweller]

hi, i tried that, the gaffer said must do better. regards

[@azenginerd9498]

Fascinating approach. I'll be interested to see if the durability of the aluminum is satisfactory in your application.

[@Thesheddweller]

Hi, I once used to fly microlight aircraft and one part had to be replaced every year… this part was commonly called the 'Jesus bolt’ believe me if it malfunctioned thats all you have got time to say before your demise.. The thing is the bolt was made of certified hi-quality steel. This bolt passed through an aluminium bracket that never seemed to wear. One of my aircraft had several bolts replaced but the aluminium bracket was still faultless and showed no sign of weakness or excessive wear. The aluminium I used is very good quality material almost aircraft grade in the way that it cut. So I’m expecting great things from this repair…. on the other hand.. regards

[@glennwright9747]

Back in the 60’ and 70’s we had a Luscombe tail dragger airplane. If I remember correctly the wings were held on with an aluminium pin. It was not a wear point.

[@Thesheddweller]

@@glennwright9747 Which sort of reinforces my reasoning of using a good quality aluminium. I didn’t use any thing else because I hadn’t any thing and I have to watch the pennies at the moment. cheers

[@glennwright9747]

@@Thesheddweller I understand watching the pennies. With the cost of fuel these days I am suddenly aware it costs about $1 per km to drive my truck! And that does not fully include maintenance and insurance. Makes you think twice nipping out to pick up a small item. The drive can cost more than the item. Buying a Tesla is not the answer either. I will be long dead before I ever save enough fuel to pay for the luxury. Fixed income retirement makes me feel miserly even if by many standards I want for nothing.

[@Thesheddweller]

@@glennwright9747 same here. 👍

[@user-by9vh7gk9t]

Здравствуйте. Скажите диаметр винта и шаг резьбы. Диаметр 16 шаг 2 миллиметра? Или 1.5 миллиметра

[@Thesheddweller]

Привет. Это не метрическая нить, это имперская нить. Если память служит мне правильно, это квадратный винт с 6TPI над 7/8». Надеюсь, это поможет. Ура.

[@user-by9vh7gk9t]

​@@Thesheddweller дюймовая. Дюйм=25миллиметров (25:8) ×7=21.875миллиметра. 6TPi=4mm.12TPi=2mm..17TPI=1.5mm из таблицы шага зубьев?

[@robertpearson8798]

Was the Baldric reference intentional?

[@Thesheddweller]

Oh yes. you’re the first to comment on that. cheers

[@robertpearson8798]

@@Thesheddweller You nailed it.

[@Thesheddweller]

@@robertpearson8798 Hi, cheers.