HS240 Making a 5tpi tandem ACME tap - Part 3

A mini series of 3 videos making a 5/8 5tpi RH tandem unipass ACME tap.

[@thesjyoungjr]

I really enjoy your videos. It's like hanging out in a friend's shop catching up. Thank you for having it.

[@HaxbyShed]

Thank you, I do aim to make them relaxed and friendly. I don't like my senses to be assaulted or overloaded when I'm watching videos myself. If it makes me grind my teeth it's not the right vid. Also ideally I like to make 10 to 15 minute vids - enough for a coffee break. Cheers

[@jaybailey3518]

You must have had the right cookbook, I went through mine and couldn't find anything for good reference !

[@HaxbyShed]

Hi Jay, it's a handy little oven for tempering up to 240C. Quick too. Cheers

[@andrewdolinskiatcarpathian]

Hi Paul. What a sterling effort, and well rewarded indeed. You deserve to “toot your own horn”. 👏👏👍😀

[@HaxbyShed]

Definitely Andrew. I was looking at the tap again today and had a very satisfied feeling of accomplishment. After a bit of a rest I'd better think of something else complicated to get my next fix. Cheers

[@bostedtap8399]

A tall task met and completed, excellent job Paul, not for the faint hearted, theres no need to quench after tempering with the method you used, you do quench when flame tempering to arrest the heat input. Fantastic work, treat yourself to a nice cup of tea.

[@HaxbyShed]

Ah thanks for that info John. So next time no oil needed in the kitchen sink, I get it. She'll be pleased. Cheers

[@HexenzirkelZuluhed]

For he first tap made it's fantastic! Great series, thank you.

[@HaxbyShed]

Thank you Sir. How does a Minecraft expert come to watch ACME tap videos? (I do not complain 😁) Cheers Paul

[@MyLilMule]

Brilliant job, Paul. Patience and perseverance. The secret to success!

[@HaxbyShed]

Hiya Greg, as you know yourself taking video slows the pace but the upside is you get a lot more thinking time. I've avoided many mistakes, and come up with many solutions, just by taking a natural thinking break. Cheers Paul

[@grahameblankley3813]

Done many threads, tapping screw cutting & I have made some taps of my own. Home made tools you can make to suit what you want & beef them up, this was a very good video had me on the edge of my lounge seat when the tap was going through, from Coventry well done 👍.

[@HaxbyShed]

Hi Grahame, as I was tapping I could feel it twisting (winding up) and at first I was sure it would just snap, As it progressed my confidence grew but I still controlled the amount of twist carefully. I have big respect for silver steel now and better understanding of what forces it will endure. Cheers Paul

[@mftmachining]

Congrats, Paul. That was a journey you won in the end. And thats what counts.

[@HaxbyShed]

Oh hi, thanks for watching. Somewhere around the end of Part 1 I thought the whole project was doomed to fail but a good sleep and a strong coffee solves many problems. Never give up, there is always a way. Cheers Paul

[@alp9532]

good job, well done I'm glad to see you stayed with your home made tap

[@HaxbyShed]

Hi alp, my own tap is definitely a better fit and it proves to us that not all taps are the same in terms of fit and clearance. Horses for courses. Cheers

[@Warped65er]

Very well done Sir. Your tap may be harder and take more time to use, but no doubt in my mind your tap is the superior of the two. Cheers

[@HaxbyShed]

Thank you Sir. 👍

[@TheRecreationalMachinist]

Great stuff! Anyone can just buy one, but where's the fun in that!

[@HaxbyShed]

Hi Matt, I think the flute grinding felt the most satisfying. From then on I thought it was probably going to work. Cheers

[@RobertBrown-lf8yq]

Wheeeewww…. Am I glad ‘we’ got through that saga 🥳🥳😁 Well done Paul 👍 ….. and the fit of the new nut looks perfect. I’d now put that tap in a glass case up on your wall, with a little plaque that says ‘persistence wins’ 🤣🤣🤣🤣 Regards ( and congrats.) Robert

[@HaxbyShed]

Yes Robert it was quite a job and there were so many setups to master. It would be a lot easier and quicker a second time. Cheers Paul

[@robertoswalt319]

I am glad that the tap worked out so well. We'll done.

[@HaxbyShed]

Thank you Robert it was a bit of a long drama. I will be doing easy light work for a while now to recover. Cheers

[@eyuptony]

That was a mammoth task. Nail-biting tapping. Great result.

[@HaxbyShed]

Yep it was something else wasn't it Tony. Not something I would attempt at that difficulty very often but satisfying when it worked. I learnt a lot. Cheers

[@Paul-FrancisB]

Great result Paul, and much better machinists fit to the original screw than the "factory" tap. The heat treatment did seem very successful and held its edge in the brass, and the tempering must have worked for it not to be too brittle, maybe treat yourself to a set of hardness testing files if you are going to do more of it in the future for some reassurance beforehand. I picked up a a really clean small single oven from market place for £25 for workshop use, and just a thermocouple into a multi-meter to monitor the temperature. I found the oven ran only 5°C higher then the knob said so no big deal. Comes in handy for warming up bearings as well.

[@HaxbyShed]

Hi Paul-Francis I will be on the lookout for an oven but ideally one that goes to about 350C so I can temper to blue (springs, screwdrivers etc). Cheers

[@Griffon37]

Morning Paul, a lesson to us all that perseverance can prevail. To make a tap and get such a great result😃. The one thing I think could improve things would have been to have started with oversized OD stock and after internal success machined down external dimension.using screw as a mandrel to make sure all is concentric. Great work

[@HaxbyShed]

Hi, tbh I thought the screw OD would bind in the new nut and expected I'd have to trim the screw OD a few thou but it was fine as it turned out. Cheers Paul

[@karlh6700]

Well done Mr. Haxby, your Super Hero cape will be along shortly!

[@HaxbyShed]

Hi Karl have you seen the movie The Incredibles where Eda Mode refuses to design a superhero suit with a cape because they are too dangerous? Easily caught in jet engine intakes and similar ..... leading to accidental early demise. 🤣 kzbin.info/www/bejne/j32WqGppgqaof68feature=shared

[@Rustinox]

Very nice result, Paul. As if it was made for it :) And yes, next time you will make one yourself too. It's all about the challenge.

[@HaxbyShed]

You are right Michel, quite likely I would (have to) make one again (to get the right fit) but it would be a lot quicker because I have learnt the best ways. Cheers Paul

[@henrikhv5084]

Very good video, I learned a ton. Thank you for taking the risk, and share it with us ;-) cheers from Denmark

[@HaxbyShed]

Hi Henrik, good to hear from you. We were learning together in that case. Cheers

[@swanvalleymachineshop]

Great result Paul . Not a road that i would go down any more , having made a few taps in my time ! Now days , i would take the short cut & buy an off the shelf bush , modify things to suit ! Would have been a great learning curve . Cheers 👍👍

[@HaxbyShed]

Thanks Max. In time I may do the same but for the moment I like to learn the skills. Cheers Paul

[@JamesP_TheShedShop]

That is very well done. Right on 👍🏻 Thats an impressive notch in the belt.

[@HaxbyShed]

Thank you James. 👍

[@billdoodson4232]

Got to be a lot of satisfaction in having made your own tap, that appears to be far superior to the commercial one Paul. The fact you have have done it can only increase your confidence in making anything else. Must admit I would have made the internal thread first, then machined the shaft and threads to suit.

[@HaxbyShed]

Hi Bill, I like to keep the original parts as much as I can and the screw has a hole drilled almost the full length as an oil feed gallery. Cheers Paul

[@philhermetic]

A hard won battle, but what a result! Sizing your tap to match the screw rather than the spec size of the thread has paid dividends! A gripping challenge overcome with fortitude. I have the same dilemma on the Holbrook topslide, the nut i have is a perfect fit on the thread, but the locating pin has sheared and i have bought a tap in order to make a new one if i cant fix the old one. Next job is to see if the new tap cuts oversize! Well done sir! Phil

[@HaxbyShed]

I hope your tap is right for it Phil else next you might be making a new lead screw as well. Cheers Paul

[@paulrayner4514]

well done mate, It's a good feeling when it works out right.

[@HaxbyShed]

Thank you Paul. 👍

[@EddywaKenya]

Wow! thats real craftmanship...

[@HaxbyShed]

Thank you Eddy it's just banking some accumulated experience on the skill-building journey. Tick that one but I still have a lot to learn. Cheers

[@Koptokaf]

Fantastic work, Paul :) In regards to the tempering: Infrared thermometers are quite unreliable when it comes to reflective surfaces. You can help it along by applying some soot to an area of the workpiece and shining the IR ligt at that. Highest regards -G

[@HaxbyShed]

Hi G, I found out later that the battery in the IR thermometer was low. With the new battery it may be good enough now. Cheers

[@jonsworkshop]

Top job Paul (or is it Percy). Great result, you toot your own horn, well deserved result and something you will have learnt heaps from! Cheers, Jon🏴󠁧󠁢󠁳󠁣󠁴󠁿

[@HaxbyShed]

Jiya Jon, I was looking at the tap again this week. Chuffed. Next week back to the usual stuff. As you know yourself we can't win an Oscar every week. Cheers

[@josephlovell6951]

For your application. I think you did right using the tape you made. It will be the best revolt for the grinder. Grate job.

[@HaxbyShed]

Thanks Joseph. 👍

[@StuartsShed]

Hi Paul. This was an excellent series. I am glad you stuck this out because it was highly informative and the end result was great. Making a tool like that is a major achievement and now you have those additional skills on hand should you need them. Very impressive.

[@HaxbyShed]

Thank you Stuart, I enjoyed the white knuckle experience that felt pointless/hopeless/adrift at times but the knowledge is in the memory bank now and has given me a confidence boost. Cheers Paul

[@carlwilson1772]

The whole series has been extremely interesting, and it is good to see a successful result. You had to make the tap to cut the thread that was on the screw, basically. Thats how it was with my mill lead nut. The screw had been made to thev spirit of the acme dimensions rather than to the letter of them.

[@HaxbyShed]

Hiya Carl, yes it was bespoke and the nut tolerance had to be tight for this application - can't have loads of backlash and slop in a surface grinder saddle screw. But for general purposes like a vice nut the clearance on the China tap would have been fine. It's the difference between a bespoke tailor-made suit and one off the peg. Cheers

[@somebodyelse6673]

It's a difficult project, a great result, and you've picked up some skills and confidence on the way. That tap isn't just a tool, it's a trophy!

[@HaxbyShed]

Yes I'll have to nail it to a board on the wall in the workshop, like other KZbinrs put up their 1million subscriber plaques. Cheers

[@constantinehatzis2807]

Excellent result, and very impressed with the durability of your tap. A few months back I made a new crossfeed nut for my Colchester student on my myford lathe with a ground tool. Cuts had to be light, being a myford, but the result was perfect. From 0.025" to 0.002" backlash. Very satisfying. As you demonstrated, there can be an issue with a new tap not being quite the same as your lead screw.

[@HaxbyShed]

Hi Constantine it's lucky that our machines themselves provide us with challenging and interesting projects. And more machines = more projects, so the cycle goes. I bought an inverter for the surface grinder that I may not need. Soon I'll have to start looking for another machine to go with that. No point having an inverter unused. Cheers

[@TheAyrCaveShop]

Great series Paul, what an adventure.. A lot of work but you now have a tap matched to your lead screw. And a matching nut. I picked up a couple of toaster ovens at the flea market $5 each. There good for tempering, but not hardening. With a bit of tweaking they'll go to 500 F / 260 C Enjoyed, Cheers....

[@HaxbyShed]

That's a good suggestion Dean. I'll keep an eye out for one, or some other heater I can repurpose. Cheers

[@tonyray91]

Well done Paul. I think you could have screw cut the nut using the advance of the cutter as you mentioned but you got the results you needed. Roton Products in the US say that there is little to be gained by having the nut more that 2x the thread diameter so a nut for 5/8” ACME thread supplied by them is only. 1 1/4” long no matter the pitch. So if replacing a 2” long original nut the ends can be relieved for clearance, this makes the nut a bit easier to machine / tap. Posting this as It may prove useful for someone.

[@HaxbyShed]

Thanks Tony. That is a useful guide. Not sure why they made it so long. I usually presume there is a good reason that I've not spotted but that's not always true. Sometimes they do it like that because they always did it like that. Or to suit some production machine they already had. Cheers

[@samuelfielder]

Very well done, and an excellent 3-part educational video. I'm not sure I'd have the patience to do it - never mind the skill required.

[@HaxbyShed]

Hi Samuel good to hear from you. I hope all is well. Cheers Paul

[@samuelfielder]

@@HaxbyShed Yes I'm fine. Just not doing anything worth videoing.

[@ollysworkshop]

Hi Paul, I'm sure someone's already said this, but the issue you have with that non contact thermometer is the emissivity of the surface. An ideal matt black surface will have an emissivity of 1 and a perfect mirror 0. A somewhat oxidised metal object is likely to be something like 0.7. There's loads on the internet about it. Basically it's a calibration factor, so your 180C reading is, unsurprisingly, a factor of 0.75 from the true value of the 240C object. I hope that helps. You've a whole lot more patience than me to make a tap like that!

[@HaxbyShed]

To be honest Olly I did not know it was linear like that. That would explain it. I guess I need a thermocouple type for anything serious then. Cheers Paul

[@russellwall1964]

Wow! Well done!! I discovered a flaw in my leveling feet design for my lathe so back to the drawing board. I get how nerve racking it must be to to not only embark on these projects, but to film them and then post them for everyone to see and critique. As a fellow hobby machinist, you’ve got my respect. I’m looking forward to seeing your next project!!

[@HaxbyShed]

Hi Russell the biggest fear for a KZbinr machinist is to get days into a project and have hours of video and then to realise it's all junk. Friday is coming and you might have nothing to show. That's why on a risky project I might get almost to the finish before I put out the first video. On the surface grinder series that problem with the home made static converter took me about 2 weeks to resolve, but I had plenty of video in reserve. I don't mind showing my blunders if people can learn from them - we are all at different stages from beginner to uber expert. I do try to avoid looking like a complete Ass though. Cheers Paul

[@russellwall1964]

Well you’ve achieved your goal. And you are doing a great job!

[@davidberlanny3308]

Hi Paul, Cracking mini series and great result. Great use of the auxilliary workshop. You did well to get it hardened and tempered with whatever you had around you. Thanks for explaining about the tap you brought your one gave a better fitted result. Look forward to seeing the grinder up and running, have a great weekend

[@HaxbyShed]

Hi David the grinder is creeping towards operations but even in 'now time' there are still a few jobs left to do to finish it. It's looking very smart. Cheers

[@bkoholliston]

That was very clever to use the tap to pick up the internal thread for the roughing out with the boring bar! When you go to buy acme screws and "nuts" there is a big price difference between just acme screws and precision acme leadscrews. They are just made to a tighter tolerance and often hardened. You did a great job on this project!

[@HaxbyShed]

Thank you Sir, I'm coming to understand that there are general purpose threads and then there are precision threads. And also I suppose the mating of different bronzes with screws of different steel grades and treatments, and turned vs ground threads. It's a deep topic. Cheers

[@graemewhite5029]

The end result was definitely worth all the hard work and will be a benefit for the next one you make ! I try really hard not to buy items from China if I can, their idea of inches, millimeters, hp or Kw's never seem to match up with our standards or, at best, you're just buying a "kit of parts" that you need to fettle into shape ? Good secondhand or NOS everytime for me ! I must say though, I was taken aback halfway through the video to find that "hand relief" was one of the services on offer at Haxby Shed !😂😂

[@HaxbyShed]

Hi Grahame, with that quip you encourage me to say something about grinding without protection ...... but I will resist 🤣🤣

[@robfenwitch7403]

Brilliant! Well done.

[@HaxbyShed]

Thank you 👍

[@graedonmunro1793]

good vid Paul,,i have not seen the magnet thing before but now i know. good also on the grinding. cheers👍👍

[@HaxbyShed]

Hi Graedon I saw the magnet thing first on John Mills' Doubleboost channel. It's a very handy test so long as you don't burn yourself 🔥🚒🧯 Cheers Paul

[@DK-vx1zc]

Excellent job! Thanks for sharing..

[@HaxbyShed]

Thank you DK. Cheers

[@dcraft1234]

Cherry red outdoors is different than cherry red indoors. Low light levels are needed to get it close.

[@HaxbyShed]

Indeed Sir, on a job you will see later I heated the part indoors and did the magnet test. Cheers Paul

[@lv_woodturner3899]

I am as happy as you that the end result was a perfect fit. Very well done. I did not expect the purchased tap to make a sloppy nut, perhaps this is due to some wear in the screw. As you said, so much to learn in this video series. Thanks for sharing. Dave.

[@HaxbyShed]

Hi Dave, the screw was the same fit along the length so I don't think there was much wear. I think the China tap would cut a good thread for general purposes like making a new vice nut where a bit of free clearance is fine (even desirable). It would still take a lot of force to cut the thread though and I've come to the view that taps of this (small) diameter are best kept for finishing course threads. An 8tpi on 5/8 would take a lot less force to cut. Cheers Paul

[@tomsemo8186]

congratulations ! Great series. Enjoy U sharing the thought process.

[@HaxbyShed]

Thank you Tom. 👍

[@RustyInventions-wz6ir]

Very neat work. Indeed very well done

[@HaxbyShed]

Thank you Rusti. 👍

[@AlmostMachining]

Great job!

[@HaxbyShed]

Thank you AM. 👍

[@be007]

well done, good result ! cheers ben.

[@HaxbyShed]

Thanks Ben 👍

[@tsheritageengineering]

Excellent outcome

[@HaxbyShed]

Well that's a compliment from you Tony teacher. best. Paul

[@cameronnerdin4910]

doing fantastic job on your channel.

[@HaxbyShed]

Thank you Sir. Just sharing stuff I'm doing. Thanks for watching.

[@HaxbyShed]

Thank you Cameron. It's hard to 'best' a good series like the tap, and so next we go back to the routine stuff. Cheers Paul

[@MJBEngineering]

You've done a cracking job there mate

[@HaxbyShed]

Hiya Brad, I will eventually get around to showing that stuff you sent me. The 7mm 'new in box' slot drill you saw in Part 2 when I was experimenting with flute designs was one of the things in your gift box. Thanks for those. Later ..... Cheers

[@MJBEngineering]

@@HaxbyShed No problem mate, no need to do a video on them it was mostly spares and clutter!

[@chrisstephens6673]

I bet someone feels dead chuffed, and rightly so.👍

[@HaxbyShed]

Well Chris the first feeling was Phew! like I'd just completed some difficult test. But yes now I admit I look at the tap with some satisfaction. Cheers

[@alanremington8500]

Wow !! Very nice !!

[@HaxbyShed]

Thank you Alan. Slow and steady wins the race. Cheers

[@seldendaniel8819]

Outstanding!

[@HaxbyShed]

Thank you Selden. Kind of you. Cheers

[@Workshopfriend]

Well done, Paul! From my perspective it was well worth making the tap and completing the job without using the bought tap. I think producing an Acme thread in bronze is quite an achievement. When you were hardening and tempering I wondered if the tap would remain straight. Either it did, or there was enough spring in it to allow it to cut over the whole length. Thanks for sharing.

[@HaxbyShed]

Clive I had the same thought about distortion. I looked up silver steel production and what little I could find said it was supplied in an annealed state and ground. So logically the inbuilt stresses would already have been relieved. You can see from the grinding pattern that it did not distort during heat treatment. Cheers

[@Workshopfriend]

@@HaxbyShed Thanks! I learned something.

[@richb419]

HI good job. I bought one of those Chinese 5/8th taps as well, it cut a sloppy thread. I then bought a quality tap. Rich

[@HaxbyShed]

Hi Rich, I think sometimes these things are more of an art than a science. Now we know that not all taps are the same, even when apparently made to the same spec. Cheers

[@jaybailey3518]

Very nice !!!

[@HaxbyShed]

You are welcome Jay, thanks for stopping by. Cheers Paul

[@christophercullen1236]

I keep a old electric fry pan in the workshop for paint Curing , some heat treatment ,warming up bearing ,pre heat for welding ( works better if you use the one from the kitchen) as a Experiment try a delrin nut . Kit from down under

[@HaxbyShed]

Hi Christopher, some form of electric heater is on my radar. Some opportunity will present itself in time I'm sure. Cheers

[@cooperised]

Good result! If you need to harden larger stuff again, I have some ceramic blanket you can borrow - looks a bit like loft insulation but it's super heat resistant. Great for keeping the heat where you need it.

[@HaxbyShed]

Thank you - I'll keep that offer in mind. Cheers

[@cooperised]

@@HaxbyShed Looked again at what I have last night, tbh I can just give you half of it, there's more than I need!

[@HaxbyShed]

@@cooperised Bill thanks ! Coffee is on me then.

[@michaelrandle4128]

It appears that your tap was better than the one from overseas. Im sure if you had to make another one you would find it easier, I invested in a devil forge, I know they are an expense but I make knifes and it’s ideal for long blades. Well done,

[@HaxbyShed]

Hi Michael before I decided on a workshop I did think about a forge / blacksmith workshop but decided I'd not get so much use from it. But the idea of a heat treatment oven is appealing .... maybe I'll find an old one somewhere going for a sensible price one day. Cheers

[@EitriBrokkr]

Well done

[@HaxbyShed]

Thank you Sir. Cheers

[@darrendean21]

well done, took some effort that :)

[@HaxbyShed]

Yep, it was quite a job Darren. Thanks for watching. Cheers

[@paukerock]

wonderful i did the same in phosdphor bronze for my celtic 14 layth

[@HaxbyShed]

It was a very long job but I enjoyed the challenge and learnt a lot. I have come to realise that I enjoy making parts for machines and other repairs more than making things like models. I'm an 'applied machinist'. Cheers.

[@paukerock]

@@HaxbyShed i made a single tap mine was les acurat an d not hardend an not sharp enoug but i got there in the end

[@raymondjames9734]

bravo! 🎉

[@HaxbyShed]

Thank you Sir. 👍

[@stewartfrye]

well, satisfied is very rewarding feeling

[@HaxbyShed]

Indeed Stewart, yes it is. Cheers.

[@MatthewTinker-au-pont-blanc]

Bravo!

[@HaxbyShed]

Thanks Matthew.

[@eddieedmondson6159]

just a thought. you need such a large force to drive the tap through the length of the nut, may be make several small ones and then ajust to align the thread and then pin it all together. Eddie

[@HaxbyShed]

Hi Eddie, it seems the surface grinder series will run and run ..... but I'm getting there. Yes somebody commented that a nut need not be longer than twice the diameter of the screw so perhaps 1.1/4 in would have been enough anyway. But a nut in two halves would have worked if it was pinned together - that's what I did on my mill table nut but on that occasion it was for backlash adjustment. Cheers Paul

[@johnsimpson8652]

That is a great series and excellent end result I! have a very late Herbert Junior that I bought over 30 years ago ,what is the serial number of yours ? By the way SAE 660 is leaded bronze giving a bit easier machining and self lubricating properties, gun metal is similar but generally cast I think.

[@HaxbyShed]

Hi John, the serial number of my Herbert Junior surface grinder Mk2 is Fv 5132. The 660 bronze is very soft so I can understand if is leaded, that makes sense. (I just looked it up: 81-85% Copper, 6-8% Lead, so yes very 'leady') Cheers

[@stephenperry5849]

👏

[@HaxbyShed]

👍 thanks Stephen.

[@RB-yq7qv]

Wise move using your hand built tap. The manufactured would have allowed greater movement over the thread

[@HaxbyShed]

Hi RB, tbh I did not even know there were different tolerances and clearances on threads. I thought standard was standard, but evidently not. I could have guessed I suppose but I had not thought about it. Cheers

[@TroubledTimes2024]

Wondering if the Delrin would not make an excellent replacement nut.

[@HaxbyShed]

Hi Ken, I have used Delrin for gears and maybe it would. Cheers

[@jimsvideos7201]

Your wife is very accommodating.

[@HaxbyShed]

Hiya Jim, she is pretty chilled most of the time. Generally we have a deal that she does not nag me and I don't nag her. It makes for an easier life. There are exceptions and sensitive triggers of course but storms pass ...... Cheers

[@askquestionstrythings]

Some day I need to attempt making a 3/4"-2TPI double start LH stub ACME tap to make a new nut for an old Artisan lathe. But I'm not sure I can as I don't have a lathe that can do a 2TPI thread.

[@HaxbyShed]

Hiya, the lowest tpi on my Harrison 140 is apparently 4tpi but since your comment I've been thinking whether I could get 2tpi using an unlisted combo for the change gears. Hold that thought ....... 🙄

[@askquestionstrythings]

@@HaxbyShed My Jet 1336PBD Lathe and my Southbend 10L tool room lathe are also limited to 4TPI. I've been trying to figure out the idea of using an unlisted combo for the change gears, but I haven't been able to figure out the right ratios. I also don't have a way to index the lathe for the double start on the thread which is likely a simpler thing to figure out than the Thread pitch and the strange profile of this nearly square ACME stub thread (or rather not the profile but the right major and minor diameters to figure out how much the top of the standard ACME profile is removed for the stub profile for 3/4" it's an odd thread and not in any book threading table I've seen which means calculations to figure it all out).

[@stevewilliams2498]

Why didn't you polish the tap before tempering ? You would have seen the colours straw, brown, blue etc.

[@HaxbyShed]

Yes I should have done that Steve. Cheers

[@user-fj9be5fe3p]

Taps like that cost $250 - $350 each here in the USA.

[@HaxbyShed]

Hi David yes I saw that on Keith Fenner's channel. That's a lot. Cheers

[@srfurley]

Is that a Harrison horizontal mill with a vertical head.

[@HaxbyShed]

It is Sir, yes.

[@dcraft1234]

Might read into blacksmithing 'drawing color' if you're interested in heat treating plain carbon steels.

[@HaxbyShed]

Yes I should refresh my memory on that stuff, thanks DC. Cheers

[@joseeduardomartins6541]

Hi Mr Paul, why You don´t do the first stage of tap with triangular thread with the same pitch. Maybe it would be easier to screw! (sorry my poor english)

[@HaxbyShed]

Hi Jose, your English is good no problem for me. The taps I see on the internet often do have a triangular (more spikey pointed) thread on the first stage to help to screw the nut on to the tap but I decided that makes the second stage even harder to turn (because it has more to cut). There is no easy win. Cheers

[@tinkeringtim7999]

I suspect if you'd popped that asbestos rag in a tube and blown the flame over from alternating sides it would've gotten fairly even quite quickly. Difficult to tell from the video how long you were stood there witht he blow torch. I image it wasn't quick as it loses heat so fast.

[@HaxbyShed]

Hi Tim, I've still to develop/improve my basic techniques for heat treatment so your suggestion is welcomed. With the tap on the heat blanket it only took a few minutes to get it hot enough. I would guess 3 to 5 that's all. Cheers

[@tinkeringtim7999]

@HaxbyShed That is much quicker than I thought. I'd have put it at more like 15 to 20 mins without being surrounded. I rescued an old length of cast iron pipe from the gas works being done where they're replacing everything with plastic piping (I did ask if I could take it!). Inspired by your tenacity I'm thinking of using it to make a heat treating oven that's a bit more stable. I've always quite liked the idea of having a bed of coke with a blower on it to bake the part rather than gas bottles.

[@richardmills5450]

I need a 1" 10 TPI Acme tap any chance you could make me one ..??

[@HaxbyShed]

Hi Richard, it would be great to say yes, but really I have to say no. , 😞. One inch 10tpi would be pretty non-standard. Thanks for watching. Cheers

[@richardmills5450]

@@HaxbyShed LOL Just kidding..love the channel cheers

[@erniecamhan]

Delrin is terrible to cut, wether it's tapping, jig sawing

[@HaxbyShed]

Hi Ernie, I'm learning it's good for some jobs but not others. It machines with a lovely outside diameter on the lathe and cuts well with the parting tool. But yes I became aware of some Delrin shortcomings with that project. Cheers

[@anthonycash4609]

You say that you might have been better to have bought the tap instead of making it. They are expensive over here in the united states a good one will cost you about $200 dollars.

[@HaxbyShed]

Yes I saw that Anthony in Keith Fenner's video. It's a lot of money. Cheers

[@InverJaze]

China stuff has low quality control. If I wanted a tool that needed to be precise I would buy British Presto or German Rebell.

[@HaxbyShed]

Hiya, after your comment I did a bit of research. I had not realised that Presto Co. is still going and apparently actually making stuff (?), I could not tell for sure from the website. Cheers