Turning & Machining a Boring Bar out of O1 Tool Steel! Part 3

[@harleyghost]

I can not tell you how much I enjoy your videos. Myself I started out as a electrician/electronics tech., but over the years had to learn as many crafts as I could. The latest is machining. Wow what an enjoyable craft. You do great work but the most important you are teaching our youth plus one old guy. Thank you for all of your hard work.

[@meocats]

A word of encouragement; I like the way you placed the insert on the boring bar, so you can undercut once you bore a hole; 2 operations in 1. Undercutting is important for seating another cylinder, like a bearing or something. A reversible punch .. whatever.

[@Keith_Ward]

Nice job John. I have made a number of tools like this that have worked out well. Typically quench in used motor oil and have never bothered with annealing but you are certainly doing it the right way by annealing. I think that O1 is pretty tough and fairly forgiving for specialty tooling like this and that ideal conditions are not required when hardening. Production work of course would be different.

[@iiianydayiii]

If you haven't yet, I highly recommend sand casting. Lost foam is an awesome (and easy) way to start. You don't need any special sand or tools. Basically, you carve what you want from styrofoam, glue on sprues and vents, coat with sheetrock mud, bury in play sand, and pour in melted aluminum. My first furnace was a coffee can filled with charcoal with a hair dryer blowing in from a hole towards the bottom. Soup can as a crucible. It's an extremely useful skill to have in your toolbox.

[@TangentAudioVideo]

Cool to learn along with you, John. Thanks for sharing!

[@iiianydayiii]

You comment about making something from nothing struck a chord with me. It's pretty high on my list of favorite things. I like the idea of making whatever I want from foam or wood, then turning that into metal. It only gets better with a cnc router and 3d printer. If you feel like it, check out videos on "lost pla" casting.

[@EthosAtheos]

For blacksmithing I use Grapeseed oil it is about the same price as penut oil but has a higher smoke temp. Safflower oil has the highest smoke temp I know of. But it is very hard to find. Peanut oil is abut 440Fs, Grapeseed is about 480Fs, Safflower oil is just over 500F. I motor oil works well to but stinks and is horrific for your health. I use natural oil because it doesn't smell so bad and if I spill it is non toxic. If you get into making your own tooling, I like belt grinders for sharpening and shaping. They work faster and better than stone grinders. I use a belt grinder to shape and polish my hardy tools (silver anvils I use in my small 60lb'er) Your videos are good keep posting.

[@bullseye9899]

Awesome job.... Great information....Also like your new video and audio....Keep it up!

[@meocats]

You can grind your wheel dull by going asynchronously on the dressing tool, which will make a smoother cut, cut less, and generate more heat to help you get a small radius. If this was a cnc grinder it would also generate more chatter, but since its freehand grinding you wont notice it.

[@Solvefunction]

great work! nice to see the knowledge grow..

[@flesvik]

What are you planing on using it for? Just general boring or for some special tasks? It looks ideal for making internal o-ring groves for the rights size o-ring width according to the tool radius. I would not use it for general boring, i would just use normal insert type tools for that and save this tool for special tasks that you can not do with the normal insert boring bar.

[@JohnBare747]

If you rotate the tool up instead of down the way you were doing it you can linger towards the end that gives you your clearance like doing a drill bit.

[@paulpannabecker4641]

John More good ideas and inspiration. I was trying to figure out how to turn some internal threads your back side sharpening turned on the light bulb. I have a small Grizzly G0602 the lead screw reverses when the head direction reverses. And alas no cross feed. All this will be resolved when it is converted to CNC but that is down the road a ways. Thanks for the insight into your learning process.

[@paulpannabecker4641]

Funding for my hobby is a bit tight. Depending on a few other things I expect to have it complete summer of 2014. It is good to see young guys like you diving in head first. I finished HS in 73 took metal shop for 4 years the instructor was just like Mr Pete. I worked in the Computer Industry, Just started doing metal working last year i am having too much fun.

[@Nikkuuu69]

How come your grinder can take off pieces of hard steel like that? What are the wheels made out of?

[@intel2you]

a round tool already has re-leaf and if make another maybe try cutting your radius in the tools cutting edge using with a tool bit with the radius cut in it if your going to make both sides of the cutter the same then all the needs to be done at the end is to touch up the end on your honing stone. cut the radius in a tool bit with a carbide end mill

[@meocats]

How round was it before grinding, just for trivia?

[@minxythemerciless]

The top surface of the cutting edge is flat. Is that the optimum angle for boring or should it have rakes ground in like standard hand ground tools? See for instance www.machinistblog.com/grinding-lathe-tools-on-a-belt-sander/ ?

[@meocats]

Parts like this always heat axially for even heat distribution (at least to some extent, yes I know the part isn't rotationally symmetric, at heat equations governs it will even out)... It's more efficient at the very least.

[@austin3538]

nice job

[@Keith_Ward]

KZbin comments seem to be screwed up, so I'm having to reply as new. Yes, I meant temper vs anneal ... I just haven't bothered with anything like the use of a toaster oven but I did use a torch and go by color with gradual cooling. You're right though, it should be done, otherwise you risk loosing the part or cutting tool entirely.

[@jerrypeal653]

I like used motor oil for quenching .

[@AeroSport103]

Good video! I appreciate your video and audio experiments. It's great to see high quality content supported by an equal quality video production. I'm interested in your video work flow. Adobe and B&H have received bucket loads of my money and it sounds like maybe you too... Keep up the outstanding work. Take care, be safe!

[@MrStandup2p]

Pick up some cheap golf balls to use as file handles... Don't let Mr. Pete catch you working with that tang exposed... B & H- you are a NYC guy..

[@meocats]

File only on the forward stroke so as not to dull your file. It's very hard to find a good file nowadays, I think even Nicholson outsource to some throwback country like india or china.

[@ScriptoZe]

I think you should use diamond sharpening stone (something like these www.dmtonlinestore.com/8-Dia-Sharp-Continuous-Diamond-Bench-Stone-P15.aspx) and an Arkansas stone for finishing, the cutting edge of the tool should be as flat as possible for the best cutting finish. The finish on your sharpened edge is like a jigsaw, check it under a microscope, or a 10-30x magnifying glass if you have one to see what I mean. That makes it subject to blunt easily. And also you should consider to put a rake angle(about 5-7 degrees) on the cutting edge if you intend to cut steel with it. 0 degrees rake angle like yours is only good for soft metals like brass and aluminum(blunts faster when cutting steel).

[@ScriptoZe]

John NYCCNC Yeah I meant top-rake. Well yeah those diamond bench stones can be pretty expensive, but you can also find some really cheap ones (I have one that I’ve bought for 16e in a local hardware store, and it works pretty well), it just shouldn't be one with recess' for knife sharpening. Just keep an eye out for one while shopping. They're pretty handy in works like these (hard surface and consistent grinding finish, compared to a regular stone). I really like your channel, keep up the good work!

[@robertrichard1804]

Not to jump too hard on you, but you're using a good file on a piece of hardened tool steel. You realize that this will in fact dull the crap out of that file and you'll be using it to make another tool afterwards. I know that you are trying to show people what it sounds like to file a piece of unhardened tool steel, and then a piece of hardened tool steel, but you should be using a file close to the end of it's useful file life. Files are just so darned expensive these days.