Electrical Wiring- How to Cut Holes in Metal Pt 2

You can learn more or ask questions @ www.electricali... Here you can see the tools mentioned in part 1 in action. Again methods vary so please share yours.

[@erion1231]

You negative minded people, stop being haters he's nice enough to share his ideas and all you have to do is criticize, shame on you all.

[@electricalindustry]

Thanks for your comment! People will be people and opinions vary so I do not worry much about the negative comments.

[@MrBucidart]

Nice Video. Here is a helping hint: To start a hole when using a Uni-Bit or Hole Saw, use a TEK screw first to start a pre-pilot hole. A 2 cent screw will add many more jobs to your drill bits. And as for speed, slower the better, heat is the tools enemy, I prefer Corrosion X over cutting oil for cooling and lube for the bits.

[@spelunkerd]

Great demo, I've never seen some of these tools in action.

[@electricalindustry]

When using a hole saw on an existing hole I use a 4sq or similar blank plate and cover the hole from the back side of cut. This allows for the pilot bit. Make sure to use a heavy gauge blank.

[@N153AX]

I use a 7/8in hole cutter (Greenlee 925) to make 1st hole before using K/O set for larger holes. I put the pilot bit through a a 1/4in fender washer to protect teeth from digging in when the pilot bit pops through. Medium speed with moderate pressure (too fast & pressing hard make teeth discolor from heat and cutting edges become dull. Cutting oil when doing multiple holes, but not for just one.

[@goofsaddggkle7351]

Unibit- need one hole in my panel and this was exactly the answer - thank you!

[@jjlwis]

Awesome video!! thanks for all the demo's and tips coach!

[@matdaddy63]

Using a impact drill with a socket attachment works great with the knockout set , cutting oil works great too for pro longing the life of the bits

[@electricalindustry]

Havn't used the impact drill,but now I'll have to try it. Thanks for the idea.

[@darley387]

With a hand held drill its just a shot in the dark...fast,slow, or somewhere in between. Steel is harder and takes slower rpms, and even slower rpms as the drill bit size increases. Most drill bits get dull fast because they are rubbing instead of cutting because of high rpms. Personally I feel that pilot holes work well on all but very small holes. A centerdrill will help you start in the correct location. One thing to watch for is the shape of the flute at the cutting end of the bit.

[@putty8903]

to stop the hole saw from grabbing. try sliding a washer over the drill bit so the hole saws teeth don't hit the side of the panel

[@garyabc]

Derek Puthoff Don't understand what you mean. ?? Thanks

[@MrBrendog67rat]

I broke my 1/2 greenlee Ko so I just use a 7/8 holesaw. I did a job that I had to punch out a gutter with about 12 1/2 pipes and used my drill press with a 7/8 hole saw it worked great!

[@electricalindustry]

Yeah I learned about those little marks a long time ago. But funny thing about the wire loop holes in a pair of strippers,learned that 6-8 years ago and I've been in the trade for 34 years now.

[@electricalindustry]

Thanks,I appreciate the comment!

[@emutiny]

concerning drilling speed. In my opinion, from my experience as long as the cutter or bit isn't getting too hot its right. kind of hard to judge too hot. if you touch it and its hot its ok, if it burns a bit its ok. If the metal is changing color and smoking and looks so hot you don't even want to try and touch it its a bit too hot. People who say low speed generally put more pressure on the tool people who say high let the tool do the work. They are both right, there is no one speed. !IMO!

[@electricalindustry]

Agreed,but if you don't loan them out they are great to have.

[@patwregan]

I only ude 2 size hole saws- 7/8 and 1-1/8 everything else is done with a punch set- those 2 size hole saws allow use of both size studs for the punch set- no need to carry any other sizes

[@electricalindustry]

That drill does not have the hammer feature. I think it the way I was drilling the cabinet. The cabinet was secure however the vibration rattled the can!

[@vamsiannepu5271]

its really enlightening....thank you sir

[@degeneral53]

one other thing is that you have to make sure u clear of any cable before drilling

[@tkin1973]

You might want to try out the cheap ones from Harbor Freight. They really aren't that bad.

[@jeffmoss26]

Nice set of videos! I am looking at MK Morse for a new set of holesaws.

[@terrorbit3553]

Okay so I was looking for some information as to why I would use a punch out set over over the other and in what situation. We have hole saw sets but we also have a huge greenlee hydraulic punch set (up to 6 in I think) and no one seems to use it.

[@MrBrendog67rat]

dose every greenlee ko set have the marks on the cups? that is good to know, thanks

[@pagefour6498]

instead of a unibit, try a half inch knock out bit. fits perfect for knock out sets.

[@pagefour6498]

www.milwaukeetool.com/press-releases/milwaukee-shockwave-thin-wall-hole-saws-40-faster-cuts-2x-life

[@frankd8881]

Couldn't use 1/12 because you were to close to the edge seen that coming

[@electricalindustry]

Good tip to know,thanks.

[@apestasguey]

keep hole saw sharp by drilling slow..heat is the enemy

[@spelunkerd]

Yeah, heat is definitely the enemy but time is also a problem. If you drill slowly, it takes longer and could ironically make heat damage more severe. For example when we weld thin metal, a common mistake is to turn amperage down to avoid burn through, but once you get to a certain point it takes longer to finish the weld and heat damage is more profound. When drilling I always use cutting oil to try and redistribute heat, but once I start I try to get it done quickly, then cool both the bit and the part.

[@electricalindustry]

As far as I know they do. I have a 25 year old set that has them.

[@MrCinimod93]

grate video i just got excepted into our local electrical coerce for September cant wait, ps you said transformer instead of pressure switch haha keep up the grate videos

[@Bootstrahps]

MrCinimod93 if you are going to call someone out about mixing up a word, you better be damn sure you know how to spell 1st grade level words such as "great"

[@jjlwis]

coach, why the name change? I like it though, makes more sense!

[@liumiaoliu6967]

Just today on my job, there is a existing hole 1-1/2", need to enlarge to 2-1/8". I tried hole saw, but nowhere to hold the center bit.

[@q......]

I know it's been 3 years, but someone else reading this and or you may remember how you did it. My best guess in how it could be done would be to use another piece of material on the backside. Like either a piece of metal clamped/tacked on. Or even a piece of wood if there is enough room. You only need the bit in the center to keep it from skating. I mean you could man handle the saw without the bit, and try to keep it on track and eventually get it to work but the end result will certainly not be "pretty".

[@benmardis8237]

liumiao liu what you have to do is put the hole saw for the existing hole size into the arbor after your new hole saw. the old hole saw will act as a pilot bit for the hole saw being used for the new hole.

[@garyabc]

Benjamin Mardis Wow, that's s great idea! I've been struggling all these years trying to cut and clamp a backer board on the inside. Thanks for the tip.

[@texasjourneyman207]

why not just use a knock out set?

[@rollyhairyaz]

Good way to wear out the tip of a unibit, Jesus. how many steps says the ryobi running guy? I think its about time for some wizards to make videos

[@cabcorner1]

You do something for 25 years then you learn something new . I never noticed marks on the cups .

[@chilIychilI]

Thanx bro

[@smithjackson6841]

Slow and controlled saw a journeyman break his wrist using klein's 1 inch hole saw when that bitch caught jerked that drill really hard to control 1st gear is my recommendation

[@q......]

All depends on the torque of the drill and how you are using it. If you are using 2 hands, and the torque is quite high, so long as you have good control then it shouldn't be an issue. One handed and high torque is a bad combo... depending on hand/wrist strength. Also with that said. I have had more "catch" on slow speed than higher. Just don't put all your weight behind it, and or jerk it around and you should be fine.

[@8yerbrain]

Unibits are too damn expensive!

[@Nutintoitbut2doit]

Fun Fun Fun great video

[@AP-514]

Drill Slow FOOL...High pressure and Slow

[@texasjourneyman207]

sorry lol i just watched further lol