Excellent tip about not changing the position of the centre or chuck when withdrawing the tailstock. And the "parting off with a drill" technique - another excellent tip!
I'm no numpty in the machine shop, but I am so grateful for your sharing of titbits of, well, 200years worth of Machine Shop wisdom. I didn't know they still taught this stuff in the UK. And it's all so reminiscent of the Model Engineer magazines I grew up with. Quite a different flavour to the (esteemed) US machining channels. Thank you.
I agree, Mr. Crispin has a most excellent channel. I am always impressed by what I see. If you don't already follow it, you may also want to look at Stefan Gottteswinter's channel.
Another Zen moment brought to you by Mr. Crispin -- great to see ya settled in your new shop and working again after all that hard work getting the shop prepped and everything moved it, bet youre really glad to be at the point of enjoying the fruits of your labor. Nicely done.
Great work Mr Crispin, selfishly I like it when you make mistakes as it makes you seem human! You’re just so good at machine work it gives me a chance to be 10% as good 😉
I was looking at the annular grooves trying to see whether they were equally spaced. I got the impression they weren't - and I'd suspect that was down to randomness of the tool as it made its first chips in each groove. Once the groove is established, they probably are equally spaced - which suggests putting the grooves in before machining final OD might work out with a better appearance.
Superb parts made to exacting specifications Mr Crispin! This whole series is so entertaining and informative! I don't think I would have the gumption to attempt something this involved but all of these techniques transfer to any project. I can definitely see where my machining will improve due to watching this series. Thanks so much for posting and sharing your knowledge!
I have heard of the the chuck being bored off a lathe in the states. I work in the oilfield, i have seen tools go down hole upside down and witnessed millions of dollars of equipment destroyed in minutes. I love my set of slip gauges and working on getting a set of pin gauges. Thanks for all the great information.
Spectacular video as always. I will drop everything when I see you have posted a new video. Your parting off tip was new to me. Thank you for sharing. It just goes to show you, you can always learn something new. Keep up the great work and videos. Fred
Excellent job Mr Crispin. Good metrology advice and DFM all in 20 minutes as well as interesting machining tips. Having spent 13 years in the great RR, I can safely say it wouldn't surprise me if this story had an element of truth in it. As with any manufacturer, mistakes do happen and get dramatised as they circulate over the years. In another company I watched 3 meters of 15mm stainless bar get wrapped round the bar feeder the guy forgot to feed the bar into at about 2000rpm. It moved the CNC machine about 4 feet and dug some holes out the floor. Good job no one was standing anywhere near! Keep up the excellent work. Jon
great video! thank you for not editing-out any mistakes, it is encouraging to know that - for whatever reason they’re made - we can learn from them and move on.
A great parting off tip! I must remember that one. Good to see that you make mistakes too. I've just made a screw for my Hemingway between centres boring bar project. Really proud of the screw. Sat down admiring it and then realised it should have been M6 not M5! Cheers! Andrew
I think my best threading efforts would be when aged about 12-13. I was making a woodworker's sash cramp - hence needing a long threaded rod. I guess the school metalwork department wasn't used to screw-cutting. As I was setting up, the 'teacher' kept coming over to see how I was getting on. He was back over as I started the first cut - which he watched for the whole length of the cut. On reaching the end, I disengaged the leadscrew half-nut and was about to wind out the cross slide when he stopped me. He was of the opinion you didn't take the tool out of the thread after each cut ! So basically, I'm claiming that I taught my metalwork teacher how to screw-cut on the lathe! The week after I completed the thread, I couldn't find my work. I was sent to the staffroom for it. Turns out the teach had been showing it to other staff and in the process awarded me a 'Commended Work' - possibly 1 of the 3 I got in my 5 years at that school and I don't anticipate the metalwork teacher gave out many 'Commendeds'. The internal thread for the nut I did at home on our ML7 as I don't remember the school having an internal threading tool !
Thank you Mr. Crispin I enjoyed watching you work immensely. Great explanation of the details of making an accurate part as well, cheers and stay away from MY toothbrush!
Thank you for another delightful video. The chuck story was a laugh, several things would have to have gone wrong for that to have occurred on a Ward turret lathe, sounds like a teaching tale to me. The person who hasn't erred, hasn't done. Stay safe, you're a treasure.
Dimension in memory being wrong. You are not alone, as I have done that more than once over many years! One thing about the cast iron - for most part I have found it much more tolerant of chatter than some steels when applying a radius tool... your home ground tool came out very well. Quite agree regarding the use of just the one measuring instrument. Nice job as usual.
My father told me that in the shop in the early 1950's they had bored out a large air compressor casting on the boring mill. When they trial fitted the piston they looked in the end of the bore two chaps could see each other over the diameter of the piston... oops!
One note regarding your "rolling motion" with the stone...Decades ago (i.e., 1970's), a retired machinist taught me a similar technique (with a flat file), to deal with nicks and burrs on a round shaft; so that one doesn't leave 'flat spots'. In all the passing years, you are the only other person I've seen use this technique. Perhaps it's a common thing, and I've simply been too isolated...either way, I can no longer feel 'uniquely all powerful', thank you very much... ;) You are highly skilled, and I hope you keep sharing videos of your great work!
I heard the parted-off chuck story in the Middle Machine Shop at RR/BS Parkside in the middle '60s, so maybe it's one of those "tales to tell apprentices".
Errors, i remember from my college days lol Compounding errors. Our scrap bin was the metal stores :-), oh hang on thats the same at home doh!. Love the Video keep them coming.
Ok now that i have dragged myself up off the floor where i was laughing so hard i almost blacked out i can honestly say i have never seen someone part of using a drill and after watching this video it will be a practice that will get used in my workshop in the future ! I think many who make spool valves like yours tend to finish a tad oversize and use an external lap to finish to size - probably because it is more forgiving as it is really more controllable in the amount of material removal .
Tom Lipton tells the same chuck destruction story in his book. In his account, it occurred at the Puget Sound Naval Shipyard in the 1950's. It's safe to say that the story is largely apocryphal and has been circulating around the trade for decades.
Beautiful craftsmanship Mr. Crispin. You explain everything so clearly that it's a joy to follow along as you are working on your projects. Who is the manufacturer of the hermaphrodite calipers that you were using? I've never seen that style before.
Well done Crispin, looked like you were using your newly acquired Carbide Slips ? Keep the videos coming and I hope that you will not be one of the people who RR are going to make redundant.
Top class, so much info so clearly imparted. Are you still at RR? Hope things work out there. It's all very well coming up with the wizard wheeze of letting customers pay for engines as they use them, but when they stop using them you'd wish you'd sold them properly. Anyway, with your skills and attitude you should find something good, though maybe not close to home.
The RR story does'nt suprise me I witnessed many incidences of the like during my time at a particular RR factory the most memorable ones being the firework displays due to employees on night shifts dozing off while machining large rings of magnesium jet engine nozzle guide veins caused by tool overheating.
@@millomweb That was later about 1980 I believe. There was a small engine facility within the luxury car plant with lost wax casting & machining. They also produced several well known golf club irons & an adjustable socket spanner at the time amongst many other things🙂
@@johnvickers5750 Sadly, I seem to know as little as you about the Vickers family. It's hard to think that they were unrelated related family of metal fabricators par excellence. Roneo Vickers (duplicating machines +?) Vickers Hall (milk carton filling machines +?) Vickers (Shipbuilding(and Engineering)) (floaty boats and steam engines +?) And I've seen 'Vickers' on electro-hydraulic valves as used in cherry-pickers. So if you feel like researching all these arms of the family, I'd be quite interested in your findings !
It is in fact amazing just how the Labyrinth works! In fact at speed the bobbin would be moving about 400 times a minute. Our Reading track is 1,100 feet long and at a reasonable rate takes 2 minutes to go round. So the steam tends not to traverse to the lower pressure end. Ever so easy to make new when they wear. David and Lily.
May I ask, are the spool type valves better than the flat valve used on older units? Maybe a video on that subject? Pls and thank you, have a safe holiday.
I'm not convinced of the parting a chuck off story unless the metal being worked on was of a similar hardness to the spindle. It would be interesting to know what chuck mounting type was in use.
It was to short as usual mr crispin whenever I get chatter out the workshop I put another jumper on ,the joke at the end of the video about the man parting off the headstock was very good but I don’t think that is true ,,,,keep em coming and er thanks
Accuracy of 10th mics - Assuming a good brand/make/manufacturer, I'd have no issue trusting a mic to a 10th. I think one could take it for granted that a good quality machine was used to make the mic thread - which is really the only part of the mic of reasonable doubt. Also that the material the mic thread is cut on should also be good quality - i.e. of consistent material - no lumps in it to cause thread cutting deviations.
Mr Crispin, How is the depth and width of the groves in the sliding surfaces determined. The purpose appears to be sealing and perhaps lubrication. Is there some formula and physics for them that you know?
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