Moore Pattern Hand Scraping
My take on the mechanics of the Moore (crescent moon) hand scraping stroke. Also cover scraper sharpening tips and marking medium application. Thanks to Wayne Moore for "Foundations of Mechanical Accuracy" which inspired me roughly 40 years ago to start scraping and pursuing accuracy.
Paypal donation www.paypal.com/cgi-bin/webscr...
Support through Patreon / robrenz
I am "robinrenzetti" Instagram lots more content there!
"Shop Notes"* by brs_workshop
• Robin's background and experience with scraping
• Showing the basics of the crescent pattern, hand positions and motions
• Scraping with a smaller scraper in a full pattern on a test piece
• Explaining how to sharpen and lap the scraper blade, advice on radii
• Showing the sharpening wheel. These right-angle slow-speed face grinders used to be widely available from every woodworking supplier. Even Harbor Freight sold a version (sometimes called Wet/Dry grinders). However, these now seem unavailable in the U.S. If someone knows why, please share.
• Showing different scrapers and their modifications and characteristics
Anderson Scraper: andersonscraper.com/product-c...
It looks like McMaster has Anderson too: www.mcmaster.com/#scrapers/=c...
Biax has a hand scraper: www.dapra.com/biax/scrapers/a...
• Rob's home-made dobber (high spot spreader)
Dykem High-Spot Blue (McMaster): www.mcmaster.com/6165k11
(KBC Tool): www.kbctools.com/products/FLU...
Not sure what the red is, so no links.
[Robin here
Red is dykem red spotting ink mixed with crayola orange powder pigment and light machine oil (velocite 10). baked at a low temp to firm up to a hard shoe polish consistency.]
• Using precision ground flatstones in combination with scraping"
*Not affiliated with any manufacturer or distributor. Links for convenience.
"I'm no authority on scraping" -Robin Renzetti Yeah right. Like how you're "not a machine spindle expert". I love this channel.
Your attention to detail is world-class. You're the Steel Whisperer.
He is so good, he can get it to whisper back!
Scraping is therapy. I was mildly paralyzed in 1986, it took me several years to adjust. The best therapy for me was refitting and scraping a big ugly ancient LeBlond lathe to regain hand eye coordination. It is like meditation, your mind shifts to another level while your hands do the work.
Well said!
Thank you! Complete different beast to "normal" scraping, Moore scraping is something I absolutely want to learn, but there is no powerscraper for that ;)
Stefan Gotteswinter and your next project is to design and build one 😆
The motion seems very similar to what the Biax flaker does. I suspect if one was to experiment with light pressure and different grinds, something similar could be achieved.
The powerflaker does indeed make the same movement, but the linear motion comes from the operator. Its very hard, almost impossible, to scrape a single halfmoon with it. Overall I find the powerflaker to be relatively hard to master.
I didn't find the powerflaker particularly difficult to use for its intended purpose, but I agree finish scraping would probably be very difficult. Also I don't think the angle of rotation is adjustable, so there is probably a hard limit to how small the half moons could be.
Quando você tiver o vídeo fazendo um powescraper me avise vou ficar esperando.
my jaw was on the floor ... until I realized that was aluminum and you weren't pushing cast iron with superhuman strength. superb as always.
I thought it was LEAD ! :p * No doubt, it was to make it easier / faster to DIGITIZE for us ? ! 'Nice chip curls !
Thanks Tony, Iron does not take much more uhmph than wrought aluminum. I used aluminum because it shows up much better on video for instructional purposes. The ease of those cuts is the Samauri sharpening of the scraper blade. It would look just as effortless in iron. Most people learning attempt to scrape with a broken ukelele while I am scraping with a Stradivarius. ;-) ATB, Robin
O hai Tony. Come here often? 😁
...and now I have to put a sign over my shop door "Broken Ukelele Machining, LTD"...
Tony, I hate to bust your bubble, but Robin's just being modest... he was actually scraping on tungsten carbide with blades made of Chuck Norris' fingernail clippings. Yoda-level stuff, to be sure
I was impressed when i started watching this video. My girlfriend glanced over and said the cresent moon shapes were pretty then wanted to know if you could do full moon scraping. It was then i realized you had a long way to go. Ill be waiting for your full moon scraping video. Thanks for sharing Mr Renzetti. Always a pleasure.
It's 2am on the west coast, and I can't go to sleep before finishing this vid. Thanks for posting Robin, fantastic content as usual! I really appreciate your vids and the unique insight you share.
It's like a vacation, relaxing, therapy, but never wish anybody vacation time like this )))
Right on! I had forgotten about the insanity piece. You ready for our little project? All the best, Tom
I am going to need to warm up some more but hope to do that size on the little plate soon. ATB, Robin
"Im not a scraping authority" Robin this is probably the most forthright and informative video on scraping that is available on public domain. Thank you so much for making this.
John Doe forsure. I should say video. Watch Wes Work- Scraping How I do it is another great reference. I am 2 years and 2 books into these arts. It's fantastic! Have fun everyone
@John Doe Edward R. Connelly, Rebuilding Machine Tools.
Your scrapers are insanely sharp! A video of making one of these scrapers from start to finish would be worth it's weight in gold! Try as I may I can't even come close to getting my scraper that sharp! Thanks for sharing your knowledge and time! Take care..
He's scraping aluminum.
Oh my goodness! I just checked out foundations of mechanical accuracy from the library! It’s really amazing stuff. The nuance and attention to detail in Moore are jaw dropping. But when working in millionths it’s what you gotta do.
I wish my dad was able to teach me this 😔. I have all his tools from him being a machine builder in Michigan. Olfson-Flextern, Excello Corp were a few he worked.
A 'Very Mat Look', oh man thanks for the shout out Robin😀 Seriously, thanks for this, it's helped a lot, am in the process of refining my curling as you know and I'm happy to say I'm getting better each week. Nice to see the print medium you use along with your scraper set up. All the very best Mat
Your allusion to therapy is possibly why Tom Lipton enjoys filing as well. He may have referred to it that way once. I call filing putting Liptonite on it. Now Ill have to call scaping putting Renzenite on it, not that Ill ever do any. Still very informative and enjoyable to view. Thank you.
At about 1 minute in my brain when to a Dos Equis commercial. “ I don’t alway scrape,but when I do, I use moore patterns. Stay scrappy my friends” He is the most scrappiest man in the world!
thank you for sharing your knowledge with us.
Can’t decide if it’s more amazing that this kind of video is even made let alone free or that you sent a photo of your most focused and intense scraping as a sort of magnum opus to Tom.
Thanks, Tom and I are good friends, nothing I do is intended as a competition with him:-)
Enginerding is fun - birds of a feather ! * I've noticed that quite a few engineers tend to be sparse haired . . . likely it's from many hours HEAD SCRATCHING ! ( I do it a LOT ) " The most elegant solution to nearly every problem is also the simplest ! "
Made a dobber a year or so ago. Love using it. I found the same thing as far as dust and chip removal. Clean ever so often and your good to go. Thanks for the video Robin, I always enjoy them throughly.
Thanks for watching Steve. ATB, Robin
"If you don't like it, don't use it", with a smile I love it!!! Thanks for sharing your knowledge
That was a very interesting video. I am quite interested in scraping and even got a Sandvik scraper a while back, but have not yet had the chance to try it. You continue to inspire. Thanks for taking the time to educate the rest of us.
You make it look easy. Great video. YT message of new video from ROBRENZ is always appreciated.
Beautiful work Rob. My buddies and I arranged for Richard King to come to Norway and run a course. Unfortunately, One of the guys who traveled to Norway from Scotland lost his parents in a car accident while the course was in progress. Since I was his host I missed 75% of the course while we organized emergency flights and transport to get him home quickly. I stilled learned enough to appreciate your fine work.
CNC machines are actually just Robin scraping all the dimensions by hand
Always so informative! Thanks!!
I remember asking you ages ago how you figured out the Moore technique that was not explained in Foundations... You went to the source, of course! Thank you so much for all the detailed, concise information you share.
Thank you for taking the time to do this and sharing it with us.
For those who have read Foundations of Mechanical Accuracy there's another fine work you need to read. Handbook of Polishing and Lapping (Ioan D. Marinescu, Eckart Uhlmann, Toshiro K. Doi). PDF is available if you google it ;) But I warn you - after reading you might want to start buying old HDDs and taking them apart for the plates to aid you in some really perverse submicron lapping of various metal workshop items :)
Not only are videos from guys like Robin worth their weight in gold, but the interesting and skillful commenters with rare knowledge like this are too. I can't find a pdf of that anywhere...and its a 200$ book. I have both books from Moore directly, maybe I just go buy this. Amazing how I spent decades trying to find some of this what used to be incredibly esoteric information, now becoming possible to find quickly if you follow the right rabbit holes. I find lots of quality rabbit holes watching Robin and Steffan's vids.
Great demonstration, Robin! I liked that you used the large scraper for that first part. You are a good teacher. Thank you. Gman
Scraping is one of the most unexpected artforms. I first watched a guy scrape ways at the Okuma factory and just could not understand what he was doing. It was many years later that I started to get it. Really fascinating to see the details come to life. Of course you make it look too easy. :-)
Great video. Thanks for taking the time to make it.
Fantastic, thank you for posting.
IT's addictive. Thanks Robin
Bravo, Robin!! Great video.
Really cool Robin! Thanks for sharing Buddy!
Very interesting and informative as expected from your videos. Thanks for your time !
That deserves a big thanks and a subscription. I learned a lot. Thank you!
excellent tutorial Rob!.. thanks
Thanks again Robin, beautiful video!
Fascinating and instructive - thanks for making this video.
very nice Robin learn something new every time Thank you
Very informative Robin.
Thanks for the great video! The insight and knowledge you share is incredible!
Another excellent video! Thank you for taking the time to share your knowledge.
You make this and pretty much every thing you do look so easy. Thank you for sharing your amazing skills .
Well done Robin
Your skills never cease to amaze me.
Robin, fantastic skill and great information as usual. Thank You!
Well done Robin - well developed and shared. _Dan_
Thanks for a great instructional video Robin Paul
Beautiful work Robin. Thanks for sharing!
insanely beautiful work. Love your work
Thank you very much!
Love your work Robin! Very Inspiring!
That is a fantastic treatise! I will definitely watch a lot more times.
Amazing work Robin... another rabbit hole to fall in !!! thanks for the video ! Joe
Yet another MASTERCLASS!
Thank you for demonstration 👍👍👍
As always I enjoyed Robin's tip.
Excellent vid, very informative.
Awesome info. Can't believe I've only just started watching your channel. Love this stuff 👍👍
Excellent video! Thanks
Thank you. I was looking for this!
Golden nuggets, as always! Thoroughly enjoyable, between the subject matter and the practical examples.
I think any demonstration anyone can do on youtube is a condensed book of the whole story, but any tale from flatsville is good
Most aesthetically pleasing scraping pattern of all time.
Very educational, thank you.
I AM IMPRESSED !!!
Hi Robin I cant thank you enough, you are willing to share your expierence (what in most instances are counted in many many of hours) as a true chraftsman, and in a way that is understandable to me as a complete novice to many of the things you explain, giving me the confidence to have a go at it. Also for taking your time to make these videos in an undoubted busy business day. Looking forward to more "Shop Notes" videos. ATB
You Sir, are a man of similar mind! Very nice explanation and work.
Rob I could watch you the rest of life and not run dry. You are the end to end all final word to myself. Love your videos and insight. I only hope to obtain 1/1000000 of your knowledge. Thank for being just a badass dude!
Thanks Robin!
I always enjoy learning from your presentation. Even on thing I already know a fresh approach. Thank you Robin
I appreciate that!
This is great information!
You're a national treasure Robin.
Enjoyed, thanks for sharing
Beautiful pattern, Thank you.
Thank you! 😊
well thats a very pretty pattern Robin. thanks for sharing that, was good watching as always!
Thanks Robin, I had noticed the Moore-shaped scraping some time ago but had never seen it done before. Looks at least twice as fast per unit area as I have seen scraping done before, but could be it’s just your skill and coordination. :) I like the large cutting edge vs. area of cut, it looks like it would last longer between sharpenings.
Thank you explaining your tools, how to make it and the information for scaping
Beautiful work Robin. Not even close to being messed up. I go to the shop to relax, always find something to work on.
Thanks for the video.
Great vid Robin!
Enjoyed and appreciated, thank you.
One of the best vids i have ever seen good explanation... I love scraping such a wonderful precise technique the more you do it the better you get but some dudes like rob know it that good they need short time to get into it again.. 👍 I use the same Sandvik...
Fascinating. I imagine the process itself would be almost mesmerising. A good way to de-stress I should expect. Dammit, I'm going to have a go at this myself now!
As always, educational, interesting, and fascinating. Regards from NE Thailand.
Whahahaha! Messed up!! That's an understatement! You are a very sick man! Thx for your time Robin
This was very helpful. Thank you so much for the information you have shared. I'm scraping in a shop-built Gingery metal shaper.
Thanks, really great explanation. A skill I would really like to learn someday. I have an old cast iron surface plate that needs some tlc! Thanks for taking your time to show how things are done.
As with all your posts, I have to watch it multiple times because the content is so rich. Really appreciate it!
Excellent video. Scraping is definitely an art form. I really appreciate the quality content you put out. Very detailed, pretty much nothing left out. Awesome job. Also the super fine scraping near the end is absolutely insanity level. I've never seen any scraping that fine. Crazy!! Very cool
Glad you enjoyed it
Thanks much! I've been in the metalcutting industry for nearly 30 years and this is one of those things that i've never quite understood. Great detail Thanks very much
Thank you so much, sincerely, for putting these videos out there. I learned more from this video than all others I've watched. Your video really helps people that don't or can't get to a class because so and so charges thousands of dollars to attend bla blah blah blah. It's the little things and tiny bits of info that make you so informative, example: the rolling of the wrist radially while keeping the stroke axially straight to make the half Moon shape. It's the little details that matter. Thanks again and keep it up. -James Robinson
Zvery good scraping I've done lots of scraping as a machine repair man and I just learned a few things from you good you got a beautiful edge on those blades. I had two biax the scraper and flowerer (half moon) but love that Moore thing .
Fantastic!!! I'd love to take a 5 day class with you! THAT would be well worth the money!! Thanks for the video.
Thank You!!!! Awesome content!
Thank you for sharing!
Excellent video! I'm going to experiment with that dobber application. It was also recommend in the metal scraping and how to get good at it e book. I like the idea of less mess on my hands. Stephen recommend the PR 88 liquid glove and it amazing! Esp when the little ones wake up. I started messing with the Charbronell aqua wash printing inks. I really liked the black but it was darn sticky. The art place also recommend mineral spirits to thin it. I filled and old eye dropper bottle and that made it easy to get it right. The kicker was if you spread it to thin on the plate it wouldn't transfer. The blue and red we're less picky. I think the dobber might be the missing puzzle peice. Thanks for putting some visual images to all the words I have been reading.
Thank You Robin, i found these very helpful and a refresher course, i'm impressed that you went to Moore for tips, I like the Moore book, I looked many time their fine scraping they do. I like your inking system, always learning from your work.
Your videos are always excellent and this one is no exception! I'm not a real machinist but a mechanic who has used machine tools as a means to an end for fifty years. The rebuilding of the machine tools interests me because I have old machines that could be improved if I would apply some of the techniques shown in your videos. Thank you very much for taking time to share your knowledge.