Spare Parts #8 - Making A D Bit Single Flute Milling Cutter
Making A D Bit Single Flute Milling Cutter, by Clickspring
The 'D' Bit is a piece of old school shop tech that I absolutely love to use. They're perfect for profile milling cutters, countersinks etc. as demonstrated in this video. But they are particularly well suited to drilling very deep, straight holes. They are incredibly accurate, and can leave a surface finish that approaches what you expect from a HSS reamer - And that's from a shop made drill!
This video is related to: "Spare Parts #9 - Making A Rectangular Bluing Tray": • Spare parts #9 - Makin...
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Cameras used in this video:
Panasonic GH5 - amzn.to/2rEzhh2
Panasonic X920 - amzn.to/2wzxxdT
Tools & Shop Products:
"Solidworks 2013 Bible": amzn.to/2FObS1D
"Hardening, Tempering and Heat Treatment (Workshop Practice Series)" - amzn.to/2KbZo6l
"Basic Lathework (Workshop Practice Series)" - amzn.to/2twVNIU
Generic Dial Indicator 0.001": amzn.to/2FOFTyF
Interapid Dial Test Indicator: amzn.to/2FPInwH
Norton 1-by-2-by-8-Inch Fine/Coarse India Combination Oilstone, Red: amzn.to/2tTEPb0
Saint Gobain (Norton) - 4 Arkansas Stones + case: amzn.to/2HCOAMX
Kaowool 24" X 12" X 1" 2400 F Ceramic Fiber Insulation: amzn.to/2pfsM3d
Abbreviated Transcript:
00:17 Now the term "D Bit" has a fairly broad meaning, and can be used to describe a wide range of cutters with a D shaped cross section, but in this video I'm going to make a milling cutter to form a V shaped groove in brass, so the geometry will need to be something like this.
00:32 Starting with this length of drill rod, the first step was to face it to length. The cutter I'm making has an included angle of 92 degrees, and I do need it to be dead on, so rather than rely on the lathe protractor, using a dial indicator to get it exactly right.
00:50 The better the surface finish on the cutting edge, the better the finish the cutter will leave on the part.
01:27 I remove the bulk of the stock using an end mill like this, and then rotate the work through 90 degrees to finish the rest of the stock removal, and create a recess behind the flat. This recess becomes quite helpful when sharpening the cutter, which I'll show you later.
01:40 With the flat just short of the half way mark for sharpening, the bulk of the metal removal is complete. A little bit of time on the coarse stone brings it even closer to the centerline, and also removes the burrs and tools marks in preparation for hardening.
02:01 A coating of boric acid and denatured alcohol, along with soft iron wire can help to reduce the oxidation scale that would normally build up during the heating process.
02:23 I used some emery paper to clean up the surfaces, and a quick test with an old file confirms the part is glass hard. At this point it's much too brittle to be of any use, and needs to be tempered.
02:36 Ideally I'd use a heat treating oven for this, but I don't have one, so instead I use the oxide colors as a guide. I heat it gently from the shank end, and let the heat slowly walk up the length of the cutter.
02:47 The oxide colors do roughly indicate the surface temperature, but I give it plenty of time for the heat to pass into the interior and transform the structure of the metal.
03:01 Emery sticks can again be used to brighte up the surface, and the cutter is ready to be sharpened, using the coarse medium and fine oilstones.
03:12 And you can see the recess ensures that the cutter naturally sits flat on the stones, so that the entire surface is being sharpened parallel to the axis of the cutter.
03:33 For one thing, quench hardened carbon steel can't compete with carbide or HSS, so I find its best to not be too ambitious with the depth of cut and feed.
03:42 And to be technically correct, a side cutting D Bit really should have clearance angles behind the cutting lip, much like an engraving cutter.
03:49 But it's difficult to form the relief angles for this sort of profile without a tool and cutter grinder, and in practice I've found that if I keep the feed rate modest, I can get away with leaving them out, without too much penalty.
04:17 They're particularly well suited to drilling very deep, close tolerance holes, and can be tailored to suit a specific requirement, for example in this case a square bottomed to the hole.
04:25 They're a great way to solve those unusual cutting problems that crop up from time to time, that might otherwise require spending money, on an expensive cutter.
References:
"The Model Engineers Workshop Manual" pg 94
George H Thomas
The many forum posts on the subject of D Bits
by John "Bogstandard" Moore
Making A D Bit Single Flute Milling Cutter, by Clickspring.
I am 57, but when I grow up I want to be like you.
This is my favorite part of machining: when you need a tool, you just stop and make one! Very empowering.
My issue is I've been making tools to make more tools to make tools. That I've forgotten what I was making to begin with.
That last cut! WOW!
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Ich thought the same
Your projects are amazing. I now see why some of these things cost so much money. The amount of time and work that go into a project like this is phenomenal.
Seriously this is the best quality content on youtube
Another impressive video! I was wondering about the relief angle so I am glad you mentioned it :)
I've learned a lot from this channel. One of the most valuable ones is all these shop-made precision tools, like this and the pivot drill.
You follow along right until the last cut..... And the gravity of the possibilities sets in!!!! Great Videos Thanks for sharing the info!!!
I just found this channel and I am amazed by this man and his work. YOU are a master.
We have been using D shape or half lip cutters on our 3d engraving machine for over 40 years. About 30 years back I came across a design where I can give a relief to the cutting edge. So we made an improvised cutter grinder where a swash plate mechanism has been used for the relief. But this video is just awesome
Your freaking genius. I got into machining watching you and appreciate it more and more the more i learn.
Great tool. Cutters are always expensive so making simple tools like that are a bargin. Thanks for sharing.
Thanks for showing you are gifted.
you just blew my mind, great video. I have always thought this type of cutter was only for glass cutting/drilling......
I bet you make a wicked fixed blade knife
thank! Using you for reference in making cutting tools and D-bit reamer and bores
Absolutely brilliant, thank you for tips!
This video just inspired my semi-functional brain to come up with a "solution" to a very tedious boring operation required to complete a project of mine that is at a stand still and has been bothering me for some time. Thank You!
4:26 Most satisfying sound.
pop. nice!
Thanks Chris! Always worth the wait!
This is gonna be so handy! Thank you!
Thanks for sharing your knowledge,your videos is a gread inspiration. Gracias.
Fantastic work and you make it look so simple !
Nice work! I’ve learned a lot from you! Thank you!
Awesome - Thank You Chris!
Mate a great tutorial. Thank you.
Brilliant finish on the clock surround at the end, nice one.
Thanks Chris, very inspiring videos! Can't wait for the next update on the clock..
Wow! Perfect work
Stuff like this amazing, I can imagine it can save allot of money and for people starting off I would think this information makes all the difference.
Yet another great video Clickspring !
Dude you're amazing!
+Pedro Lopez Thanks for your support Pedro, I appreciate it :)
Merci beaucoup pour ce beau travail
Yes clickspring updates!!!!!!
Your videos are cinematic gold! Keep up the excellent work! 🙃
Excellent! I started making one last night, based on a sketch in an old lathe book, but I couldn't figure out the purpose of the 'recess behind the flat'. Thanks for explaining. Cheers Paul
Stunning and Inspiring work! I can't wait to get my own milling machine and late and start doing my own work!
Muy buenos vídeos! Gracias por compartir.
Awesome . Chris
From Argentina : excelente!!!!!!!!!!
To achieve the correct degree with the indicator is the perfect professional!!!
just awsome as always
Thanks for information
This collection of videos are like therapeutic to me. Watching the precision, the amazing footage, and listening the descriptions, simply relaxes me, and makes me forget about my stress...
+alex akkers Terrific to hear that Alex :)
Good idea , thanks guys Hello from Indonesia
You sir... are a genius!!
Good and sencible presentation, well done.
new favourite channel!
Sweet a Clickspring video
thanks for sharing
I have no idea what half of the stuff you're talking about means. but I've watched like 3 videos in a row. keep it up
Great video, I'll go back and review it many more times to let it all sink in. Thanks
A lot of information there.. TFS.!!
Awesome trick for beginners
Yes I enjoy this video
I’ve been a job shop machinist for 8 years now .. and I have got to say I love your work it’s perfect love how you make your own endmills
Super cool, thanks
Beautiful
Good!!! and thanks for your information.
What a brilliant clear ,,, concise ,,, and simple presentation ,,,, many thanks
+Alan Plumb Cheers Alan, I appreciate you taking the time to watch :)
Just excellent videography. Many thanks.
Such a craftsman, Chris. These videos are an absolute joy to watch. I'm hanging out to see your new videos more than my favourite TV shows or movies. And I'm glad you're sharing some home-grown Aussie intelligence, engineering and easy-going nature with the world. That's how we roll. Certainly the quiet achievers. Keep it up mate.
+Don S Cheers Don, great to have your support mate :)
Excellent
mind blown ive never seen one of those !!! great video !
Thanks
YES!!! NEW VIDEO!!!!!
Excellent video and explanation!
+Matt Williams Cheers Matt, I appreciate you taking the time to check it out :)
Fascinating, as always:)
Amazing
Another well made tip. It's good to see someone explain D Bits well as they make excellent reamers for jobs that require a reamed diameter on a flat bottomed hole. I recently made one for a block of aluminum that needed a 4" long cartridge heater. A D bit made from drill rod was the perfect tool to ream .3750 clear to the bottom of the 4" blind hole. Love the videos, keep them up!
+armorer1984 Will do mate, terrific to have you watching :)
Always the highest and finest standards. Great work again.
+phooesnax Thank you mate, all the best for Christmas mate :)
its amazing
Good work continued
Just awesome!
Your videos are absolutely mesmerizing...I could watch them all day
+John Roberts Terrific to hear that John, great to have you watching :)
this made my day! Thank you for making such awesome content!
+GregBadabinski Cheers Greg, very pleased to have you watching :)
Very good job
Yaaayyy... a new Clickspring video. Been missing them. Always thoroughly impressed with your work. Both on the actual topic of the video, as well as the production value of the video itself. One thing that really speaks to the quality of the presentation is that the viewer is left with a feeling that one could do it oneself. Even if I'm painfully aware of the fact that I have several years of practicing ahead of me if I ever dream of repeating anything done in your videos =) Thanks again for an excellent video!
+Left Flamingo Thanks for the kind words LF, I appreciate your support :)
super job
Awesome. As always.
+Elton Topalli Thank you for watching Elton :)
Awesome content. Thanks
I know absolutely nothing about machining (though I watch videos like this almost religiously), but your videos have the best payoff. The BEST.
Amaizing Work Best wishes form germany :)
Today was a great day! New clickspring....YES! Beautiful job as always Chris.
+Matthew Phelps Cheers Matthew, I appreciate your support mate :)
Wow this is my first video and I am already really hooked! Amazing!
Awesome Ian, great to have you watching mate :)
Jesus christ, the quality of these videos is amazing. The video, the bacground music, the narration, everything fits so well. Incredible job man!
+asda89 Thank you for watching :)
wow !! thanks fo sharing
Yeah... New Clickspring videos!!
When I was a kid I couldn't afford to buy milling cutters so I started making d bit mills. I found that if you insert some shim under one of the jaws in your 3 jaw ( I couldn't afford a four Jaw and collets were something I only ever saw in catalogues and books) then you could generate some form relief. You've just got to mark out the high point before you mill. (or in my case back then file ) the flat. Weirdly 45 years later I am still making these tools to overcome emergency problems in a hurry. Keep up the good work the videos are fantastic. Thank you
If there's any kids watching... auctions and scrounging are the answer. I got 200 (yes, 200) sets of geometric die head cutters for £50, a pair of Herbert precision drills for £50, a Parkson 2A horizontal milling machine for £50 (bit of a theme developing here). I passed on two pallets of 4, 5 & 6 morse taper drills (maybe 500 drills) for free (help yourself son!) because I knew I'd never own a machine big enough to use them. That was before Ebay of course. Wish I'd taken them now. I got a box of about 50 rotary cutters for £30 when the Cincinnati main dealer closed in Peterborough. My first lathe was a Colchester Student for £200 (same place I got the Parkson). I've outfitted a very decent workshop for next to bugger all. Everything dates from the 60s & 70s and works fine. Pickings aren't as good as they were 30 years ago but you can still buy decent lathes, mills, drills, etc if you watch local auctions and just nosey around machine shops. I've been offered very decent lathes and all sorts of other stuff for free. Scrap bins. Never pass a scrap bin. Always be polite and offer cash or a bottle of something.
Nice work Chris! Your videos are professionally perfect and well enjoyed.
+Jonathan Flissar Cheers Jonathan :)
best information I've come across bravo man
+Darren Birkbeck Cheers Darren, thanks for watching
YES!! Finally!!
+psychofmse Ha ha! Thank you for being patient mate!
That precision at the end made me grin and giggle like an doof....its so beautiful!
+Tim Morrison Great to have you watching Tim :)
Clickspring Great to have something (and someone!) of this caliber on KZhead! I love seeing your work: a combination of all my passions, designing, making, and clocks, machining, art and moving parts! (And thank you. :D)
Oh man you are just simply genius, love your videos.
+Zohaib Ahmed Thank you Zohaib, I appreciate you taking the time to watch :)
There's nothing like making your own cutting tools for the shop. Those single flute d-bits are awfully handy and do a great job when properly made. Nice work.
+comictrio Cheers mate, thanks for watching :)
Nice job
I love watching the tool making videos. Especially when the tools are as nice as these. Whenever I score a mixed lot of tools the first thing I look for are handmade/customized tools. It's a bit like a mystery novel trying to figure out who made it, when they made it and why they made it. You do fine work, sir.
+hopper1 Thanks Hopper, great to have you watching :)
Hermoso! Se nota que si le pusiste atención a la clase.
I'd like to say that you're smart man
Thank u
That recess is like a sharpening choil on a knife blade. Smart