Great show Crispy! Do you suppose the variability in the concentricity may be due to side play in the scroll and its recess? It seems that the jaws would move in conjunction with any side play in the scroll. I guess you could measure scroll wear with a dial indicator - within the limits of travel, at least. Do you suppose the spare jaws were an oversize set designed to be fitted to a worn chuck? Thanks!
I think side to side play is definitely a major cause, along with un-even wearing of the scroll if different locations. I don't think they were deliberately oversized I expect it is just a case of manufacturing tolerances stacking up. Cheers.
Yes it's frightening. Not to mention the speed and logistics required for getting everything in and out in time for the other shows using the same floor space.
I think it is becoming clear that the idea that there is a project in hand is merely a rather weak excuse to simply play with interesting machines. I have come to realise this about myself and I think it is true of nearly everyone with a few notable exceptions who actually do produce a stream of actual results such as Gerald Wingrove who, I think, did not actually have a garage full of such machinery.
Nice work there, were you worried about the chuck coming loose running in reverse or were the cutting forces not enough to worry about. Cheers for the great educational videos.
Had the cutting forces been larger then yes I would definitely be concerned but in this case they were very light. A problem along these lines could however, have been caused in the event of a mishap or accidental heavy cut.
You sir are missing a slight point that you might check. On your chuck there is a large round point on the face of the chuck. You should always use that point to tighten the chuck. It will make a difference on runout.
3 Jaw scroll chucks with hardened jaws are not meant for the level of accuracy your trying to attain. You need to fit soft jaws then bore to the diameter your going to hold.
Hi, no I didn't do that. I had aligned the grinding spindle with the lathe spindles centre of rotation so for the flat face I guess the that's the important bit. You could argue that any error in headstock alignment would give an error in the taper angle produced. Cheers.
Mr. Crispin....you wouldn't happen to have a set of plans/prints on that lapping machine that you would be willing to share with a fellow machinists......???
Why do I have a lathe and a milling machine? My answer is that the lathe make parts for the milling and the mill makes parts for the lathe. 🤣 Drives the wife crazy!
Mr Crispin we shook hands a few months back at DRPC1999, I would like to pick you brains about where i could get a square threading die, single point cutting tool (.800 Pitch), i'm chasing someone in the states but was wondering if you knew of someone local - midlands/uk? - David M
That problem with the pull off spring tension is why I use push off for small heads with small screws with my Geometric heads. Just remember that when using 5-C collets that you must have the exact size collet for whatever is going into it. ER collets allow some compression to the next smaller size as the way they’re made allows for parallel shrinking of the inside diameter. But 5-C collets close the inner diameter at an angle if smaller work is put into it, causing some wobble in that work. If you over tension the collet to get that wobble out, or to try to get it tight enough, eventually you will damage the collet and deform it permanently.
Mr. Crispin I have 3 questions for you if you don't mind. 1: Do Rolls Royce machinists actually wear those long sleeve jackets while machining? I can't help but feel like that's unsafe. I drove a needle file through my hand a few years ago deburring a part close to a 3 jaw chuck. I was doing something dumb but I also knew I was doing something dumb. So I was "paying attention". The only problem was I was paying attention to the center of the file that was demurring, not the tip of the file that was right next to the spinning jaws.... I feel like wearing that coat you're ALWAYS doing something dangerous. You might be paying attention to your hands, but are you paying attention to your sleeves? I was taught to never wear long sleeves especially when running a lathe. I'm sure you've seen the "Russian lathe incident". It's only a matter of time before part of your coat catches on something, no? I'm sure you're paying attention 99.9% of the time, but it's the .1% of the time that's important. I was very lucky. My hand is "fine" but every now and then it hurts. Maybe in 30 years it'll hurt more. 2: On a lighter note, any chance you're related to some Leafes in New Hampshire? 3: I live[d] in Uxbridge, MA. Ever been to Uxbridge, UK?
Hi, not just Rolls Royce but actually all UK machinists have long sleeves typically. Either in the form of overalls or over coats. I can see where your coming from but it doesn't appear to be a problem. If you were to go to a trade school here at the moment you would have long sleeve overalls but you would not be expected to buy your arms anywhere near the chuck. No filing and no emery cloth ect. Long sleeves also stop you send from getting covered in hot swarf and coolant. As for the other two questions I'm afraid it's a no for both but good comment!
you should probably wear a respirator when using the angle grinder. the aluminum oxide or whatever the grinding disc is made from is likely not good for your lungs.
A fantastic vidoe Mr Crispin what a great bloke Richard is. & I have so much to thank him for when he was working at Kelham Island Museum in Sheffield. As boy I would go down on Sunday's to see the mighty River Don Engine in action. being absolutely fascinated by this great 12,000 HP monster I was always drawing detailed pictures . Richard saw this & trusted me as I got a little older with this wonderful engineering manual book dating back to 1905 that came from the mill full of all these fantastic working drawings of all the parts . So with great dedication I put them all together with my pens on a drawing board to create a detailed line drawing which is on display at Kelham Island Museum today, He was always very helpful & so supportive. I learnt so much about this great engine from him I'm so pleased he got the job instead of the other guy . We can't thank him & his team enough in restoring The River Don Engine getting her back up to steam for visitors past & present to see . The willing man will find a way Take care Richard & all the very best Greg Harris
Just stumbled across your channel with the fitting of the horn blocks to your locomotive. Looking at the framework I realised that you were building Martin Evans’s Springbok”. That brought back some wonderful memories of many years ago around 1962 when my dear old Dad started building the very same loco.and yes he only had a Myford ML7 lathe and a Foxconn pillar drill and lots of files. I spent many happy hours watching my father working on the loco and after about 7 years he finally saw the engine run with a dummy water and coal supply. Sadly Dad was never to see the engine completed as he passed away suddenly. The engine ran superbly and an excellent locomotive so I am sure you will be pleased when you finally finish yours. Unfortunately I was not skilled enough to finish the loco and sold it to a member of the Southampton society of model engineers. I will continue to follow your locomotive venture as it will bring back really wonderful memories of my old Dad working on his.
18:24 british dry humor competing with an supposedly even dryer alcoholic beverage. This resulting in the aforementioned visual and audial happenings leaving me in a slight sense of joyful sense.
My three jaw only has one main pinion to draw the chuck closed. The best I could get was 1.5 thousands TIR so I’m thinking it’s in the scroll and it’s as good as I can get. Also it’s a “adjust true” so I dialed it in prior to grinding starting off at the most concentric position I could achieve. Got it down to 1-1.5 thousands. Then proceeded to promptly order new jaws and started drooling over new chucks. I mean 1.5 thousands is enough to warrant replacing the whole chuck right.. 😆
@@MrCrispinEnterprises I'd just apply common sense, particularly regarding a cold engine or one equipped with a turbocharger. You work at Rolls Royce, I bet there's some operating limitations regarding ground running before a take-off is attempted so that the components achieve working temp and stabilize and the oil reaches a minimum temp. I've got 7,000 hours being pushed along by a pair of Rolls-Royce AE 3007 engines and the minimum oil temp allowed for advancing the throttles to the take off gate was 40C - sometimes that was a blummin nuisance in the dead of winter in, say, Oslo.
@JohnSmith-vi5pz Yes you're point around engine temperature is important. If I was starting from cold I'd wind the throttle right down but when it's still hot it seems happy starting on full. As you say common sense. How many hours do you have digger driving?
@@MrCrispinEnterprises Regarding the digger driving, It's hard to say as I don't really monitor it - I could work it out based upon oil changes I do according to the Hobbs meter but that would make me a Dull Man! But it's just my own digger that I use for occasional jobs around the farm so very very few hours compared to a full time driver. I've had one for around 20 years - the best bit of kit I ever bought as it is also excellent for slinging my machine tools to move them around and on and off trailers.
Top video thank you. I intend to copy your procedures once I return from holidays in the Philippines on my Chinese PF 1340 Lathe. Chinese Lathes need a bit of precision enhancement.
After a year or two of learning all this Machinist lark, just kidding. Its the opposite of lark! I'm about to scrape my three metal plates to get a flat plane. My question is, how does a nobody attend one of these? I can guess it's a bunch of high end outfits showing off their latest wares on how to do things cutting edge to their market customers. Either I learn by going or... I walk around in a state of wonder like a 5 year old seeing a 6.6 litre V8 lifted right out of a TransAm. Either way seems like a good day out to me!
