THE DRILL PRESS #3, drilling vs reaming vs boring (speeds, feeds & cutting action for each)

[@ianbertenshaw4350]

Finally a nice simple and easy to remember formula for drilling and reaming that works with any reamer ! I try to avoid touching a part that is in a lathe or mill until it is time to remove it from the machine , you soon get sick of cut fingers or digging out metal splinters from your fingers ! I made the mistake once of taking a feel of a part that i had just milled the surface on and my thumb nail touched the still rotating cutter , i won't go into the gory details but the feeling of that cutter ploughing through my thumb nail is something i won't forget ! There is a channel called clickspring that shows how to make emery sticks for polishing the outside of turned parts , maybe something similar using dowel rod wrapped in emery paper ( glued on perhaps ) could be contrived for polishing drilled / bored holes on the lathe and when that bit of emery goes dull just cut it off . Marc they say you can't teach an old dog new tricks - you just proved that theory wrong ! Thank you !

[@Hirudin]

+ian bertenshaw Gah!

[@duobob]

Great advice on starting a hole with a drill, opening it up and bringing it back to position with a boring bar, and then finishing to size with a reamer. I had not heard of that concept before, but it makes total sense to me now. Thanks, Marc!

[@THATLAZYMACHINIST]

+Bob Korves Thanks for watching Bob! More to come, Marc

[@jameslofthouse5889]

Really enjoying the content Mark, catching up on all your old videos.

[@petee716]

Very engaging and informative. Keep up the great work. I'm looking forward to part 4.

[@AmateurRedneckWorkshop]

Thanks for another great video.

[@robrobinson6706]

Marc. Always fun and informative I had a laugh. Keep it coming.

[@noelhenderson700]

Back in the distant mists of time, when I was a student at a technical collage, there was a metrology instructor who always maintained that the metal a part was made of was only there to keep the holes in position.

[@THATLAZYMACHINIST]

+Noel Henderson Hi Noel! I for one believe that a hole is the part of a piece that doesn't exist! Marc P.S. I love sentences that mean more than one thing! Thanks for watching and for a great comment, Marc

[@PhilsProjects]

Great information Marc. thanks

[@MartsGarage]

Thanks for the lesson, Marc. I like the 5% reduction because I can do that in my head, .500 - half of that - .250 - 1/10 of that - 25. 500-25 =.475. Easy peasy. This is all new to me and I find all your videos very instructive and interesting. Thanks for your continued efforts. Mart.

[@fredflintstone8048]

Very informative video. Using percentage makes perfect sense, makes a lot more sense than a fixed offset in size, especially as you say with smaller holes.

[@juanrivero8]

I watch all your videos and learn something from each of them. I occasionally go over to your French versions and watch them, because you spare me Imperial units and do it in the system I grew up in, i.e. the misnamed "metric" system. I was taught in third grade, in a supposedly third world country, that the correct designation is the "decimal metric system." It should be called the "decimal"system. However, too late to change the world. I want to congratulate you on your French enunciation. I understand it perfectly with my "bachillerato" French. I can never understand parisians. The system I grew up in was based on the French Baccaleurat so I suppose I am a "Bac." In fact I am considering switching over to the French channel. Improve both my machining and my French! Thank you for all the work you put into these videos.

[@fawzialkhalifah7067]

That's really great and useful information I always have problems on drilling deep holes, the drill bit overheat and get dull, just now I recognize why. Thanks

[@jimmilne19]

Thanks for the reply on my question about retracting a drill bit quickly from a part. I thought it had to do with the bit jamming because of ever increasing compressed chip load on the way out. Now I know it is because of heat build up. Your diagram showing drill bit vs. reamer in a hole, could have benefited perhaps by showing a change in diameter at the cutting edge of the reamer (there wouldn't be one on the drill bit) showing the fact that as the cutting edge engages the wall of the pre-drilled hole it makes a larger diameter by cutting. Of course the following flute edges would encounter an already reamed hole and therefore no cutting, some rubbing. Now I sound like an expert, but I think and write "out loud" always in the interrogative. Also for him whose memory is short, the lables "drill bit in a hole" and "reamer in a hole" would have helped in the beginning of the presentation. Chuckle. You and your wife are most welcome to visit us. We'll take good care of you both here in Grønland (Danish), Groenland (in French and a few other challenging languages) and Kalaallit Nunaat in Greenlandic (an impossible language).

[@Hirudin]

Drill, bore, THEN ream... ingenious!

[@flatblack39]

This video is worth saving and reviewing periodically! Thanks Marc.

[@royreynolds108]

I would suggest multiplying the hole size by 0.95 or 95% instead of multiplying by 0.05 or 5% and then subtracting the result to obtain the answer. This procedure obtains the same answer if done correctly but reduces the amount of work and chance of error. With a calculator it is no big deal. As an engineer it is better to reduce the chance of error if at all possible. Keep on going. Yah!!!

[@THATLAZYMACHINIST]

+Roy Reynolds Great suggestion Roy! It is obvious now that I see it, I never was that good in math. I will pass on the suggestion in the next video, Marc

[@andyhillis6779]

"Condescending bunch of pricks" indeed!! I was screaming the same thing (paraphrased ) at the screen in wholehearted agreement. Thanks for explaining the "how" and the "why".

[@MrEh5]

Drill under size then use a two flute end mill followed by the reamer also works quite well.

[@davedigs]

another great lesson thanks Marc i have a question though will a machine reamer still cut an accurately sized hole if there is wear in the tailstock quill

[@THATLAZYMACHINIST]

+david Sanderson Nothing is ever perfect, and reamers are made to correct for slight misalignments. There are however limits and it is best to get it as aligned as possible. I guess the best answer is try it in some waste stock and see if you get the results you need. Wish I could be of more help, Marc

[@pierresgarage2687]

Got that exaxt same Over/Under reamer set, real life saver but doesn't produce the same deep effect on me though... lol Great teach... ;)

[@samhenderson2947]

I've got some wobble in my chuck on my drill press. Have you covered this anywhere? Have removed the chuck and cleaned it. Helped a bit but not much. Thanks again for the vids very interesting.

[@bsteleven]

Great how to videos. I'm like Michael Walter Could you talk some about expanding reamers?

[@Justaman1958]

Marc, Great video. On your preferred dimension sounds great. For us hobby machinists who often use scrap material how would you do it? For example, I have two gears that I plan to use is a project. I can't change the hole in the gear, so I would have to make the shaft to fit it. Just my $.02 worth.

[@DSCKy]

If you bore out a drilled hole with an endmill will that bring the position back to accurate for the reamer?

[@THATLAZYMACHINIST]

+DSCKy Maybe! And that is not a joke. It would work if everything was perfect (head alignment , rigidity of the machine, tool deflection ...) but there is a chance that the cutting edges along the tools flutes will chatter and that will throw things off. If you do use the end mill to bore a hole, use your Z axis for the plunging and not the quill, and keep everything locked up tight and well aligned. if the head is even slightly out of alignment you will have a problem. a single lip cutter (boring bar will work fine even with a small misalignment of the head. This is a complex problem and I have just decided to make a little quickie on the subject, so watch for it to get a full explanation. Thanks for the great question, and thanks for watching, Marc

[@johnmichaellane1]

Does chip load prevent chatter and binding? I've noticed that drilled holes only chatter and jump at the end of the hole, once the drill has stopped cutting.

[@mertsilliker1682]

bravo

[@shinli1961]

Dear Marc, thank you very much Lesson: 47

[@skeeterweazel]

Did you just call me a prick? Not cool, dude. Ha! Thx for the video. Marty

[@grieske]

These videos are very helpful. The remark that you should never put a body part in a workpiece (a finger with emery cloth, for instance) struck me. I might have done that some day without your comment. Thank you.

[@THATLAZYMACHINIST]

+grieske The types of injury's that result from twisting are horrific. A finger can be torn of in a fraction of a second often bringing with it tendons sometimes up to the elbow. I am glad to hear that the warning struck you, it is nice to know that what I am doing serves a practical purpose. Marc

[@Hirudin]

+THATLAZYMACHINIST Ahhh!!!!

[@frinxasestronca3399]

Yeahhh :-)

[@swarfrat311]

Marc, Thanks for another interesting and informative lesson. You may do boring on a machine, but personally, you are anything but boring! ... It is assumed that when you said that "size matters", there was no sexual connotation involved! (LOL) ... I like the fact that you are covering each lesson in such detail that you have to keep adding parts. Not a problem here! The more information you come up with, the more I learn. (And I tend to be a greedy person! The more stuff I can fill my brain with, the better!) Thanks again! Happy Machining! Dave

[@THATLAZYMACHINIST]

+Swarf Rat If I planned these videos too much, I would probably get intimidated by the task. When I started the theory video series I thought that 20 videos would suffice. The part three of lesson eight is the twenty-fifth lesson and when combined to the shop videos and the little quickies, I have on my website over 80 videos to date ( and the same amount in French). I don't even want to guess how many are still to come but it is far from over. My retirement plans was to produce videos to help novice machinists and when I was done that, I planned on spending my spare time volunteering at the hospital. It looks like the volunteering will have to wait. Thanks for watching and for taking the time to comment, and you are right about the size matters comment. Marc

[@robrobinson6706]

Marc please explain "skidiving. .......sorry teacher I'm paying attention now.

[@THATLAZYMACHINIST]

+Rob Robinson High (Hi) Rob! That's what happens when a French Canadian writes in English joke! It looked write (right) too (to) me. Thanks for pointing it out, and for watching, Marc

[@mertsilliker1682]

bravo