Drill Selection 101: How to Pick the Right Drill? | Machine Shop Talk Ep. 111
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- เผยแพร่เมื่อ 5 มิ.ย. 2024
- What kind of drill should you use, and what should you be using for the application? If you’re a new machinist, it can feel intimidating with all of the options to pick from and the factors at play.
In this episode of Practical Machinist’s MACHINE SHOP TALK, Ian Sandusky from Lakewood Machine & Tool is back with a beginner’s crash course on drill selection to help make that process easier!
What are YOUR favorite drills to use? Let us know in the comments below!
Chapters:
0:00 Intro
2:15 High-Speed Steel Twist Drill
6:24 Carbide Drill
0:07 Carbide Tipped Drill
11:40 Carbide Insertable Drill/ U Drill
13:28 Outro
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When piloting in 316, would have some cobalts handy. Wasn't doing production. Not professing to be some kind of guru on this, but it was working for me. And the boss wasn't giving me the dirties on how much I was spending, so that was a bonus.
There is a step between hss and carbide with cobalt drills. Price is better than carbide but much stronger than hss. Also, hss can drill inconel and monel but they just chew up the drill point quickly. So, if you only need a few holes you can get away with hss in a pinch.
That's a good point! I actually don't have... any cobalt drills in my shop off the top of my head, so they totally slipped my mind!
I wouldn’t call cobalt drills as step between HSS and carbide, it’s not a big difference between them. Instead I would put powder metal drills between HSS and carbide drills. Drills like Nachi SG series
Good information. Maybe you can talk about how to run really small bits without breaking them.
If you hadn't mentioned Cobalt I would have. I use Cobalt quite a bit. My shop is in my backyard, so I'm the only employee. I try not to work full time as I'm retired. I don't have any CNC machines and my lathe and mill don't have coolant. This said I need to watch speeds &feeds like a hawk. Cobalt tools have really helped me become more efficient. For someone in my situation I couldn't think of a better choice.
Good video. Got some good information on drills with inserts that i wasn't aware of .
.
Thank you very much for checking it out!
Spade drills are my goto. More size range per body.
I haven’t used them a lot, I’ve got one coming in next week for a job so I’m interested to see how they stack up!
@@iansandusky417if you have the spindle power they work great.
The only problem I have with carbide tipped insert drills is when they fail they crash and burn very fast. If you don't have Matrix type reflexes to stop the the tool (lets say 3/4 of a second) you'll end up replacing the entire tool holder. If your lucky you might be able to use a stone and try and salvage what existing material of the holder is left.
Ahhh yes this is very true - I think we all have a detonated drill body in the bottom of our toolboxes somewhere. You definitely have to be on top of monitoring tool wear because when things start to go bad with them, it does indeed happen VERY quickly.
How about hss insertable drills. Mostly used for deeper and larger diameters. With a couple of bodys u can have a lot of different diameters. (amec tools). I use them when u drils cant go deep enough. And off course there are what u call gun drills (up to 80xD) from guhring.
Good information. Maybe you can talk about how to run really small bits without breaking them.
I would have liked to have seen a discussion of TiN coated drills.
Good point, those slipped my mind!
You don’t have to have an indexer for solid carbide drills but you can have a draw with carbide tips for modular drills with almost all sizes, mentioned that one body could have a long variety of tips. For example from 14.0mm to 14.9mm
That's a very good point! That's a handy one for those carbide-tipped drills. Much, much cheaper that way!
Hsco or m42 is good option for ss in small batches
Companies like online carbide are making carbide drills so atainsble i try to not by hss. Ive found with hss you have to play around alot with feeds and speeds especially if your looking at +-.002 or less just my experience though
good video Ian
Thank you very much sir!
There is another version of the carbide tipped drill. It's with smaller drills where the tip is brazed or something to a HSS body. That drill got us out of a jam where we were breaking cobalt and solid carbide drills in a hardened exotic no matter what we tried. My theory at the time was the HSS allowed just enough give so the tip wouldn't break. You talked about them some in the video but people should not sleep on thru coolant drills if their machine has the option. You can run them 6 to 8 times faster then cobalt, don't need a center drill, and they last a very long time. Kennametal will resharpen and recoat (above a certain size. 3/16?) them for a fairly small fee. Their regrinds run and last as good as the original.
Oh yeah - pretty much a masonry bit, right? We’ve used those in a pinch before as well in tool steel when we’ve had to get out of a jam!
@@iansandusky417 Same basic idea but these looked exactly like a regular 135 degree twist drill. Sort of like a Kennametal Kentip without being indexable.
Can you comment on spade drills, I believe Allied is the creator of that style drill. If I'm not mistaken, they are used primarily for lathe work, but how do they compare to carbide tip or U drills?
I actually have a long 8.5” one coming in for a job next week - I haven’t used them much but I’ll know shortly!
@@iansandusky417 would appreciate the feedback
Wheres the spade drill??!!
Never really used them to be honest - I have one coming in for a job next week so it’ll be cool to give it a go!
@iansandusky417 The first time I used a spade drill was on a manual lathe in a gear shop. There were a few steel bodies that could receive spade bits, mostly hss in that shop, which actually is the better choice for that application. That machine didn't have the power or rigidity to really push carbide spade drill bits. These were big holes that took 20 minutes to drill. These were 3 inch diameter holes, one to two feet deep, usually thru holes. That was on an old lathe, in 2007. Ten years later, I revisited the 3 inch spade drill on a very large 12 axis dual spindle MAHO. Now I had enough HP, it was in the vertical configuration (this machine was very large and actually had two spindles, one horizontal and one vertical.) That 3in spade drill blasted thru 18 inches of 1018 steel in one minute! It was beautiful. Figure the MMR for that!
I came for drill drivers not drill bits dammit
Haha how do you mean??
@@iansandusky417 like impact driver vs normal vs corded or something lol
@@tommyshobalongdongoh fair enough haha my apologies for disappointing!