Paul, I'm very impressed by your use of the involute principle to progressively cut the profile. I've seen other methods - base circle and tapes or wires, calculating offsets and using a slitting saw - but this is a new method to me.

Great job on the repair, Paul. The method you used to index and cut the tooth is very clever! Looks like the gear should work a treat. (Don't sweat the witness mark... Gives it character!)

Absolutely phenomenal work (ignoring the whoopsie of course, but we are all only human). Can't believe after all these years of watching YT machining community videos that I have never stumbled upon your channel. I've immediately subscribed, toggled the bell on, and I am now anxiously looking forward to enjoying your entire portfolio of work. 👍👍😎👍👍

Beautiful work

Rustinox sent me. Great channel, and a great repair 👍 🇬🇧

Smart idea to align the tooth using two blocks!

That's a nice repair even with the oops.

I zip-tied a spring to keep pressure up on the pin to disengage the back gear. Nothing sucks more than having a nice cut going and it just slows down and blows up an insert. On the other end of the spectrum, I have a bungie cord to keep the back gear engaged.

Don’t fret about the lill oopsy! It gives it character! good job on the fix, it should work great 👍🏻

As an owner of several old lathes I know missing teeth are quite common, this really looks like a very do able method of repair, thank you.

Great Job. This ist Dentist Work. Perfekt!

love this approach. in the past I have had some success welding in a new tooth and using slitting saw and 60° AND 45° cutters to shape. I will definitely keep your techniques in mind for future repairs

Lovely job.

Nice! As I am going through my South Bend 744 9a, I have found 3 gears that need attention, the two back gears and the bull gear. The small back gear is a loss, so I will replace that, but the bull gear is missing 2 teeth and the larger back gear 1. Now I will fret over whether to try and find those as used parts or whether to try and repair those 3 teeth for about a week before I do anything. Awesome video as always!

WOW!!! This is fantastic!

Ciao Paul, this is Alberto from AB-SHOP Italy !! Stopping by from Paul, of the Knackler's workshop !!! Wow, i have to say wow in front at this work: this is your first video that i watch and it is the first time that i see this type of repair without a dividing head: really a great job also with a nice and clear explanation too!! From today Paul you have a new subscriber to your channel, me !! A big Ciao from Italy Paul, Alberto.

thanks for the upload, another trick learned !

Your creativity knows no bounds. Thanks for sharing.

Fun to see your approach! I would have gone for bronze braze but yours is better. The way you setup that gear on the mill is brilliant!

A very clever way to repair a gear. Never seen like this before and can be done with seemingly little effort. I pay respect. Greetings from Germany, Raik

Excellant repair !!

really clever and good to watch

HAHA MUNTED! Love that word. Perfect repair though!! Oops and all. Very good technique to line up the cutter without using a dividing head or special tooling. This is why your channel is one of my few favourites!!

Always a pleasure to see a new video from you - thanks!

That was an ingenious repair Paul, you could call the cockup a makers mark. Would never thought of that myself, thanks for sharing.

Very nicely done

Great video! I never would have thought of doing it like that. I especially liked your single point dovetail cutter. I destroyed a couple of change gears off my Atlas Lathe beyond repair so I found a involute cutter set on eBay. They were not very expensive and I made some new gears from scratch out of brass. Way better than the original zermak stuff. I have a rotary table I could tip up on its side to use as a dividing head. Slotted the key way using the quill on the mill like a slotted. Came out ok. Worked great.

First off I really enjoy the look, feel and pacing of your videos. There's a good serving of "meat" without a lot of "parsley" filler. Next is the wonderful analysis and thoughts on how to place and hold items. As any machinist knows it's not about the metal removed but the setup details before the power is turned on. You really hit the bell with the setup details on this one. I learned a bit more than usual from this video which I hope I can remember when the need comes up in my own shop. The "trapping" of the gear with the blocks engaging the lower teeth is brilliant. Matched by the way you picked off the flanks to mill the new tooth. Keep up the great work and I wish you many more subscribers. And yes, I think my stomach turned over as badly as yours when the tool took off sideways... A feeling only another machinist would understand I'm sure... .:D

That is absolutely genius. Bravo.

Lessons were learned but such a good job! Simple and efficient.

Very nice👍👍 work

Nice work

Very clever. Thanks for sharing!

Hello Paul, Great stuff... I really like the logic you followed, it worked well. See you on the next one. Take care. Paul,,

So what's a small mistake between friends ! 😁Very well thought out and machined and very informative.Thank you for sharing.

Hi Paul. Thanks for showing the method you used. Very good. Also for showing your mistake, which many would have covered up somehow. Regards. Steve.

Interesting way of tooth repair; thumbs up

Nice tooth repair, very incisive.

Niece repair Paul. Exactly how I saw my dad do it on a clock wheel only press fitted and filed to shape by hand.

Excellent! very clever

Nice bit of work and really great technique. I have done a similar repair on a SouthBend, but tapped a few screws, brazed and filed to form. It is great to get it back into production. anyhow. enjoyed, cheers!

I love your videos thanks for sharing. The mistakes just remind us your human.

that is a great fix, realised with intelligent solutions given limited tools - kudos! I have the same problem - on a south bend back gear (10K in this case). I'm wondering how important the dovetail is, structurally - a square section would be so much easier ;) Also since there's no load on the top of the tooth, why would you not put the grub screw - or two in from the top? Did you consider brazing or silver soldering it in?

i like your indexing system. will use it in fiture. had to coppy a gear that i couldnt get the tooth count in my rotary table without serious mucking about. ended had to buy one. could gave used your system and a nother gear as index wheel.....nect time.

Paulo, tu sabes que ese engranaje no quedo con la resistencia necesaria debido al error en el corte en la parte superior, hubiera sido más honesto de tu parte realizar nuevamente la reparación desde cero, hasta conseguir un resultado correcto y resistente. Saludos

A bit more JB Weld on it and it will be fine.👍🏴󠁧󠁢󠁳󠁣󠁴󠁿

Great work sir, hate moving the wrong wheel or just slipping up and making a nice fix into not such a nice fix, but looks like you caught it quickly enough to avoid catastrophic damage, could have slaped some JB Weld in that divot on side of that tooth, stuff is strong 💪, thanks for showing us that no one is perfect and we all make mistakes 👍

Excellent dentristy~!! I wonder why you didn't braise the tooth in

Brilliant!

Very different approach and something I would never have thought of. Simply brilliant . Regarding the cockup , as you had made the tooth from steel, what about using a mig and slowly carefully build it up without putting too much heat to mess up the JB weld. And machine it again as before ? Just a thought

An intelligent and pragmatic approach, but i bet it will always irk you when you see it.😉

Clever solution.

ΕΞΑΙΡΕΤΙΚΉ ΕΡΓΑΣΊΑ!!!

Still a very good job and it works so I would call it a success .

You're right, Paul. For these low speed geas it doesn't matter much if there is a little damnage on the tooth.

nice one. On the subject of the wandering cutter, no that the tooth is steel would it be possible to weld in the missing material and then machine it back again...just thinking out loud incase it had somehow made a mole hill out of a mountain fantastic series btw thanks for sharing

Bozo visited your shop I see!

RightOn! (American for "FarOut"...)

Nice repair!!!

Well using a dovetail to repair a gear Ina bull tooth is brilliant! If I had seen this technique 4 months or earlier I could have repaired a broken bull gear for my company and saved then 20,000 dollars us in lost contracts and a new parts I would have been a hero, as it stands the welder tried to weld in a new tooth and cracked the entire gear. oh well, next time I suppose!

If you had the broken off segment of tooth do you think it could have been brazed back on and operated successfully? Asking for a friend.

Brilliant method of indexing the gear teeth Paul. That out of the box thinking at its finest! Was Heath involved in this ? 🤔🤔🤔 Cheers Nell

I'm sorry you did a great job, but it wasn't easier and safer to refill with cast iron electrodes or better still with AISI 309, it has perfect adhesion with cast iron and is workable. What a huge job you did, congratulations

Given the tooth was mild steel could you have tig welded a repair on the tooth with minimal heat?

As the repair is mild steel, you can just fill the mistake with a blob of weld.

Well done shed dweller! :)

Gear Dentist 😉👍

Never heard the term G clamp used before, are you sure you don't mean C clamp?

Warum machst denn weiter, nachdem dir bei 10.15 dieser Fehler passierte?

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