THE DRILL PRESS #2, drilling, reaming, counter boring, counter sinking, spot facing & tapping.
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- Опубликовано: 5 окт 2024
- Part two of the eighth video of a series of videos presenting a free online machine shop program (lessons) for novice machinists. More specifically, this video looks at drilling, reaming, counter boring, counter sinking, spot facing & tapping.
![Natanael Cano - Amor Eterno [Official Video]](http://i.ytimg.com/vi/EO4prCs6WpM/mqdefault.jpg)
Another fantastic film Marc, thank you John from sunny Devon UK
Marc, great video . Very informative. Thank you for all your videos. Go Canada!
Hey Marc,
Yet another super informative video! Many thanks.
Take care, my friend.
Jimmy
+JimmysCanal Thanks Jimmy! Here it is -28°C with a wind-chill of -40°C. Tell me that it is nice in Greece? It would give me hope that summer will return one day! Your friend ( who plans on visiting Greece some day (probably in winter)), Marc
+THATLAZYMACHINIST
Hi Marc,
Today is a bit better from yesterday. The temperature is slightly below 20°C with a cloudy sky. As for tomorrow we expect a little higher temperature and sunny day.
Comparing the weather you have in Canada, here you can walk with a T shirt and shorts. Whenever you decide to visit Greece, I promise you that you would not want to leave!! I also hope to see you some day....here or there!
Your friend Jimmy
Excellent Marc! Thank you and take care.
Your videos are improving Marc. If others went into such detail it could get painfully boring. Your personality, timing and sense of humor make your videos very watchable. Thank you for your efforts! Jay
Great video, thanks.
Dear Marc, thank you very much
Lesson: 46
Very informative. Many thanks.
In my work as a dental surgeon we speak in terms of end cutting and side cutting bits. I've always thought of that as a nice way to differentiate a drill bit vs reamer.
Thanks for another entertaining and educational video Marc.
Beautiful super etendard armed with an exocet that you have in your wall. I loved the "aviones de guerra" magazine, had a few posters myself.
+Florencia Perez Hi Florencia! As you may know, I was a model maker for the National Research Councils High speed wind tunnel. I am not a jet fighter aficionado but having worked on many models, I must admit that I fell in love with the pureness of their shape, even if what they are used for makes me shiver. It's a bit like a great white shark, beautiful but deadly. Thanks for watching and be safe! Marc
Very helpful. Thank you.
Great video. One other item about the number set is I believe it is also the designation of orfice sizes use in gas fired equipment.
another highly educational video from the master !
I hope there will be something on taper pin reamers in the future Marc ?
Thanks. I just learned that I have been doing it wrong all these years!
Muito bom :-) fico à espera de novos vídeos.
Good stuff. Maybe the better word for the reamer would be "scraper" ?
Hi Marc..... you have spoken about all these reamers.... what about expanding guided and non guided reamers?
I have pressed the course notes tab, but can't seem to get them.
Well, it might sound a bit stupid but, can hand reamers also be used with a machine tool?
+Kostas stamatakos The answer is yes but! Hand reamers have a very long and progressive taper on their end. This produces a very gradual cut and helps a lot since when working by hand, the force applied on the tool is very lite and the RPM is very low. If you use them in a machine, very low RPM is required (60 RPM or less) in order to avoid chattering caused by the large contact on the cutting lips. In part three of the lesson 8 I will talk about proper use of reamers and I will explain the chatter problem. Thanks for a great question and be safe, Marc
G'Day Marc. I was wondering, can or should you use hand reamers in a drill press? It seems plausible......
You can but you must be careful! Hand reamers have very long tapers on them to help engage the tool in the hole by hand (with very little pressure). That taper increases the cutting lip contact which can cause chatter if rotated too rapidly. When used by hand this is not a problem but if use in the drill press you must reduce the speed to under 50 rpm for a 1/2" hole in mild steel (example). Most drill presses just can run that slowly. However you can use the drill press to align your tool and turn the spindle by hand. Some people even produce a hand crank that can be fitted to the upper end of the spindle to make this type of operation easier. If you opt for the hand crank make certain that the machine is unplugged, and that the drive belt is removed. I hope this helps!!! Marc
+THATLAZYMACHINIST Thanks Marc, everything you say rings true! I did get chatter running a 12mm hand reamer through 12mm thick aluminium alloy. Speed was set to 280 RPM, although my drill press can operate at 150 RPM. The hole diameter turned out to be 12.04mm.
I didn't try your technique because it didn't cross my mind at the time. I think it is quite difficult to manipulate the spindle pulley and the feed lever by hand (consistently/simultaneously). But I plan to try it in brass next time.
Why is bottoming a reamer in a blind hole bad?
Thx.
Marty
+skeeterweazel Hi Marty! The problem is that when the end of the reamer hits the bottom, the reamer has nowhere to go. Since there is a force applied on the tool (pushing it down) and it can't advance it is going to rub and move sideways (wobble around). The reamer has cutting edges along its flutes and that sideways movement will oversize the hole. Thanks for watching and for a great question, Marc
I have a drill set that is 0.3 to 1.6 mm Grins
All this imperial madness, i'm lost.
+dgedi78 It's just grade school arithmetic. How can you be "lost"?
+MrShobar I mean all this charts. Do you have to learn everything ? "I need a 0.277 inch hole, it's a J drill !"
Then forget the letter designations. Just view them as judiciously-chosen decimal sizes, for the reasons Marc stated (e.g., tapping). Regards.
+dgedi78 No you don't need to learn anything, go watch tv. You don't have to memorize the numbers, you just need to read a chart