Not sure whether to be more impressed by the information or by the live, unedited hat throw. Good show.

That was extremely satisfying seeing you describe what the grinding pattern should be on the spindle only to achieve that exact finish a moment later. Some invaluable knowledge has been gained! Merry Christmas and a happy new year Crispin

Learned a lot within half an hour, thank you so much for putting out those videos! Have a good one!

I can't believe I watched this with a straight face. I'll be here all week. badum tish! Seriously, I learned a lot. Thanks for sharing.

Here in the US we call tour "lace finish" a CROSSHATCH pattern.

As you have enjoyed making, we have enjoyed the consuming of your instruction, entertainment and presentation of material and its removal! See you in 2023!

“The willing man will find a way.” Where have I heard that before? 😊 Love that you carry the tradition of greats.

That was brilliant. Your apprentices are very lucky to have you as a mentor.

As one who has completed an apprenticeship in Fitting, Machining and Tool making many years ago, I find your explanation on this matter, to be outstanding. Many thanks.

It bears repeating: Your apprentices are lucky to have you! Season’s greetings, and I will be here awaiting your return :)

When I worked at Jones and Shipman, building your 540 as it happens! on the cylindrical grinders, we called that the crosshatch finish, nice tutorial by the way, cheers, Dave

That was informative and enjoyable. The Deckel hat toss was appropriate.

I have came to your channel a few weeks ago, and am very glad I did. You are an excellent teacher! A plus is that for me (non native english speaker), you sound very much like Sean Connery.

very valuable information, thank you very much Mr Crispin

Thirty minutes of invaluable instruction. Thank you for this and for all of your many other excellent videos. Wishing you a very pleasant and peaceful holiday season from Germany.

That crisscross pattern is beautiful! Great explanations and demonstrations as always!

Thanks for all the videos of 2022, MrCrispin! Looking forward to what you have to share in 2023!

man you are very intelligent, thank you for sharing your vast knowledge 😁👍

Thanks for the video which was interest,hope you have a great Christmas and NewYear Mr Crispin.👍👍

Excellent demonstration. I am definitely looking forward to the New Year's projects. Thanks for bringing us along.

Merry Christmas and a Happy New Year to you. I like how you have transgressed into Ornamental Turning using the grinding wheel nicely done.

Solid presentation as always. I hope to mount a toolpost grinder soon, so this and the previous videos are extremely welcome. Merry Christmas and best wishes to you and yours.

And a merry Christmas to you to Mr Crispin 👍

Wow! You are the first person to explain the grinding wheel cutting/wearing to me, and me understand it. Thanks a lot 👍

Seasons greetings to you too Crispin, this was another interesting lesson, thanks.

As always - another great classroom session. This time the dark art of Grinding. You've brought it to light professor! Well done. You're humor is outstanding and enhances the videos to no end. Have a great Holiday.

Hats off for Mr Crispin! Difficult topic, clearly explained. Thanks, Sir, your aim is better than most...

Thank you for all your post throughout the year sir. Merry Christmas 👍

Fascinating yet again Mr Crispin. Have a super Christmas and a Happy New Year to you and yours. Cheers.

Excellent explanation again. Looking forward to next years progress. Have a very Merry Christmas and a Happy New Year.

Merry Christmas and a happy new year and thank you for the videos.

Thank you for the education, very clear and always interesting. Merry Christmas

Great explanation! It all made sense for me at 10:00. I’ve often considered the same regarding lacing when fly cutting, seems the same principles may be involved. Happy Holidays and looking forward to 2023.

Well done, sir.

Thanks again for sharing your vast knowledge ,merry Christmas and a happy new year 🎊🌲

This was actually completely and simply understandable... Well explained and touched upon... Grinding is more of an art than it is direct machining, which is why it falls under metalworking black magic, like knurling tapers and such... Its why a good grinder is not a good machine, its a tandem of the operator and the perfectly maintained machine, working in sinc, with the operator taking lubrication(coolant), grit size, abrasive type, material type, stepover, feed approach, stepdown depth, dressing method for the wheel, workholding method, general speeds and feeds, spindle oil temp, shop temp, coolant flow, a whole shitload of factors into consideration, to allow the machine to do what it theoretically can do if all those conditions are met and monitored...

A VERY MERRY XMAS MR.CRISPIN.👍

Fascinating, all has been revealed. Have a very good holiday.

Excellent explanation Mr C. Happy Christmas and have a great new year.

Enjoyed your videos over the year and look forward to marry more to come hopefully in the new year. Wishing you a very Merry Christmas,

The algoritm for me was spot on this time. Great content!

Thank you for on-topic, clear explanations.Time watching this was well spent.👍

Very well discussed video on the technical aspects of grinding.

You have extensive knowledge for your age, it's great that you share it for others to benefit. Excellent video!

Thoroughly enjoyed the video. I was recently studying dressing and truing when I came across this video, completely changed my prospective and understanding of the topic from a more realistic point of view.

What a load of , really interesting stuff, thanks .

I have never had the compulsion to buy merch before but that was before Mr Crispin's swimwear collection.

Lol I had your video on the big 85 inch screen and wow so good to watch your video other then my phone love it

excellent video as always. Merry Christmas and a happy new year Crispin

Hello Mr. Crispin. I also have a toolpost grinder and I picked up a few tips from this video. Thanks. I had a similar problem to you with mounting of chucks on the lathe. I bought a 28" four jaw chuck for my large lathe (Broadbent-Schofield BSC) and it had a D1-11 taper on it. My lathe had a flanged spindle nose (common on large English lathes of that era, 1960's). I had to machine the D1-11 taper out so it could fit on the flanged spindle but my other lathe wasn't large enough to swing the chuck. After scratching my head for a few hours I hit upon the idea of mounting the chuck backwards on the spindle by using the four jaws to grip the OD of the spindle flange. With some brass shims to protect the spindle flange and some dialling in I got it running flat and concentric to 'dead nuts' accuracy. It was then a simple matter of boring out a diameter and shoulder to fit the flange. And yes, I did measure up the flange before I mounted the chuck so I would know what size to bore the chuck to. Have a merry Christmas. Ken

Another very interesting video, l do not have any grinding equipment but your explanation has answered other questions about engineering that I didn't quite understand. Great tutorial once again. Regards Gary

Very informative. Cheers and Happy Holidays.

Really well explained and enjoyable to watch. Have a great Christmas!! ¡Feliz Navidad and good luck from Spain!!

Thanks for the lesson- it was extremely clear and helpful. 👍🎄👍

Very interesting and looking forward to more. Have a merry Christmas.😊

Merry Christmas crispin and keep up the good work.

very enlightening. thank you for this

Thank you Mr. Crispin, that was superb. A very Merry Christmas to you! As for your brother, well, I hope he finds a fresh toothbrush in his stocking. 😁

This was a fantastic video!

Cheers, enjoy the days off. I will get a shirt now for myself: I survived grinding theory.

Hi There. Lots of Info on grinding etc, which is very informative. I don't have a grinder, but the previous Grinding of the Spindle Assembly gave me lots of information, which is invaluable. Keep up the good work. Have a really Great Christmas & a very Innovative & Prosperous New Year

Thank you for another great video :)

merry Christmas , well explain and very amazing satisfying job

Thank you, wonderful explanation

It all makes perfect sense.

Loved it! Great content and I learned a lot :)

Thank you for such a clear explanation. Oh to be one of your apprentices. Happy new year to you. Looking forward to seeing your videos in 2023. 👏👏👍😀

This channel is great.

Excellent theory in your videos. 👌

Very interesting! Thanks.

Happy Christmas Mr Crispin. I have a similar issue with my Hardinge lathe. I won't touch the spindle nose, beyond my pay grade. However, the three jaw mount will need cleaning up some how.

what a great video. I'm restoring a 1967 chipmaster and may wish to grind the spindle to attain the best precision possible. This video will aid my endeavours greatly. I dont yet know if my spindle needs grinding because one of the cams is jammed and I haven't attempted to remove the badly damaged cam yet. But I now feel confident on overall direction for my restoration

Hello Mr. Crispin, An interesting video, many thanks. Wishing you a Merry Christmas and Happy New Year. Take care. Paul,,

Merry Christmas!

I got excited about your last tool post grinder video and went looking on eBay. Next thing you know, I have two tool post grinders.

Good information thank you

Nice video- interesting channel . Merry Christmas to you !

Excellent presentation. I'll be looking forward to you explaining why meticulous machinist use a bare hand to wipe mating instead of a rag. Merry Christmas to you and yours. And my you have a great and healthy new year.

Excellent video ! When are we getting a tour round this lovely workshop

Merry Christmas from Canada. I will be putting a YT channel up this spring. It will be a laugh and learn format for those attention deficient viewers. I won't just hand out e.d.m. secrets willy nilly though. Sorry China, wouldn't go there for Pratt in the late 90's and I haven't changed my mind since.

Have a great holiday Mr C, hope bro gets a new toothbrush....

Merry Christmas Crispin! I do hope Santa brings lots of new toothbrushes for your brother - so you can steal them of course and a decent dental plan for him as well as i feel he might have a smile like an Edwardian Street urchin because you keep knocking off his toothbrush🤣 If your merch can be shipped from within Australia, I'm in! Iron on patches for my dust coat would be nice also !

Hi Mr Crispin Great instructional video, the only problem is that I don’t have a surface grinder to put the knowledge to use do if you feel like a challenge then I have a M&W inspection square that really needs re grinding.

And condiments of the seasoning to you mr crispin

Merry Christmas to you in return.

Logical!

Happy New Year 2023 Mr. Crispin. May I request that you do a programme on how to design and machine a flexible joint for conducting superheated steam, like one you would require in a Mallet-type or a Garratt-type articulated locomotive? If possible, please include a commentary from Mr. Gibbon as well. Thank you.

You are a natural teacher the information is clear interesting I have enjoyed this year's video and looking forward to next year's keep the information video coming

I have a question that I've thought about a bit since I retired: How much coolant is proper for different types of grinding? I observed OD grinders at work with copious coolant flows and _think_ that I remember being told that the relatively high coolant flow rate out of the nozzles was used to "blast clean" (my words, not theirs, I think) the wheels by flushing metal particles away from the wheels and minimize "clogging" of the wheel surfaces. Of course, these were industrial OD grinders with ~4-inch (~100-mm) wide wheels that were ~4-feet (~1.2-m) in diameter (which I suspect wasn't large by industrial standards), so maybe what I'm remembering only applies to "large" wheels? Of course, the coolant jets couldn't be too strong to avoid breaking the wheels down prematurely which I remember seeing when experimenting with a different bond wheel type. Are my memories too foggy and incorrect or am I remembering at least _some_ of it correctly? Have a nice holiday and hopefully Santa will bring your Brother a new toothbrush (that I'm certain you'll "borrow" for use in your workshop)!

Thank you Mr Crispin for all the informative and educational videos. Seasons greetings to you...and may Santa deliver a new toothbrush for your brother. I still await the day that you miss when tossing your hat. (perhaps a "blooper" video in the near future)

I need to watch this three more times before I even pretend to know yoir wizardry

Great video and well explained Could you please show how to dress the wheels squarely and at desired angles, I am a little lost at this part of the process

You would be a excellent teacher in some other life. Is that D1-6 spindle?

Thank you, that was quite interesting. One thing I've wondered about with surface grinding is wear on the dressing diamond. Is it just too small to be of concern? Or do you have to "spark off" on the diamond as well to take care of any minute wear which might occur during the dressing?

👍 great work and explanation. Why did the blueing show a flat surface? I would have expected a dished cut if the wheel was not flat to the spindle. Happy holidays to you and yours my friend!

Merry Christmas to you and your family, I hope your brother gets a new toothbrush 😂

A question. When grinding the taper on the spindle with a conical wheel, you have differing speeds due to the change in diameter or circumference of the grinding wheel, and also an inverse diameter or circumference of the part being ground. Technically, the wheel being the sacrificial item, won't that also impact the finished surface dimensional accuracy?

When they said to keep your nose to the grindstone, I don't think they meant your lathe spindle nose.

Many thanks to you for all the videos you have made. Does your brother can get a new toothbrush for Christmas? Stay safe and well. 🏴󠁧󠁢󠁳󠁣󠁴󠁿👍

You seem very knowledgeable and i have to ask how do you mill something flat when it is bent (1mm bow) without it starting to vibrate? (relatively thin like 15mm, decent size like 800mm by 600mm), today i had to mill exactly that and i ran it at like 200mm/min feedrate and 315rpm .. if i go to 400-500rpm it instantly starts to vibrate, same with the feedrate.. I used clamps on 2 sides which press down and in (couldn't use clamps on the other sides because the bed of the mill is too small). If i were to clamp it down really tight it would spring back as soon as i released the clamps no? I mean now its relatively flat i would say like +-0,07mm. If you were to use a magnet table it would spring back as soon as milled/ground aswell i would assume?