As an electrician, I have used greenlee knockout punch set for making a 2 inch hole in an electrical panel for conduit. I would say that it's much better than using a hole saw because it doesn't leave behind cuttings.
I can really appreciate this video. I was curious about these for aircraft sheetmetal. Now I can see it would not be what I had hoped. You saved me some money!
This is interesting we never used these I work for an electrical company and the only ones we use is the greenlee hand hydraulic pump it can make a one inch whole in not even a full pump. But the pumps we use can do anything from 1/2 to 4 inch knockouts it makes that thing look like a toy compared to them lol.
I had the harbor freight set, used the 1" on electrical box and the bolt stripped out. Not hardened, no good on steel, threw the whole set away. In the whole set the bolts either bent or stripped.
I a good set for most basic electrical applications I can keep a set with my stuff without them walking off. But yes you need to put some force on then to punch out.
Have used these in the trade, not for to thick metal. Seen one kit used for steel panels, the guy took back the kit three times to be replaced in one week. Not close to the quality of Greenlee, use the pump and ratchet type both and seldom replace the dies, unless someone breaks them, because common sense wasn't so common.
A 25mm nut IS A 1 inch nut. It is NOT odd that they use a metric size here because they don't. Your 25mm wrench just fits like my 6 point 13mm socket fits fine on all 1/2 inch nuts.
25mm=.984 Inches, 1" socket will be slightly looser then 25mm socket. 13mm=.511 inches, 13mm socket will be slightly looser then 1/2" socket. Yes you can tell the difference.
I need something to cut through layers of foam, and I am having trouble finding the right product. I feel like these are way too strong for me though. Do you have any advice for something I can use?
Since it's not a "beautiful" hole I'd rather use a holesaw...Just clamp a pre-drilled piece of scrap wood on the material if you're enlarging a hole...I bought the Greenlee set over 20 years ago and never used it and I think it's long gone....
It's absolute garbage. My 1/2 inch punch worked the first hold but then got harder and harder. By the time I was doing my 3rd hole I noticed that one of the rises was worn down more than the other 3. I used it on a electrical panel box so it wasn't hard metal. If you want to waste your money then buy it.
As an electrician, I have used greenlee knockout punch set for making a 2 inch hole in an electrical panel for conduit. I would say that it's much better than using a hole saw because it doesn't leave behind cuttings.
I can really appreciate this video. I was curious about these for aircraft sheetmetal. Now I can see it would not be what I had hoped. You saved me some money!
Sweet
Greenlee top dog here. For the average guy these are ok. Ive had my Greenlee set for close to 30yrs and still cut like new
Yes
This is interesting we never used these I work for an electrical company and the only ones we use is the greenlee hand hydraulic pump it can make a one inch whole in not even a full pump. But the pumps we use can do anything from 1/2 to 4 inch knockouts it makes that thing look like a toy compared to them lol.
The greenlee is also $500 to $1500 and It's usually the companys. Having to wait for someone else to finish using and search for it
I have a greenlee currently 15 years still good interested in the harbor freight hydraulic punch though
I had the harbor freight set, used the 1" on electrical box and the bolt stripped out. Not hardened, no good on steel, threw the whole set away. In the whole set the bolts either bent or stripped.
I used mine a few times in a junction box and it needed to be sharpened. If you are going to use this tool a lot get the $100 set.
I a good set for most basic electrical applications I can keep a set with my stuff without them walking off. But yes you need to put some force on then to punch out.
if using sheet metal, would the knocked out disc portion be smooth and flat or distorted like the plastic in your video?
Have used these in the trade, not for to thick metal. Seen one kit used for steel panels, the guy took back the kit three times to be replaced in one week. Not close to the quality of Greenlee, use the pump and ratchet type both and seldom replace the dies, unless someone breaks them, because common sense wasn't so common.
I bought a set several years ago. The threaded rod stripped out with just a use or two. Not the best HF tool. Take care. Doug
Ouch
Do you know how it would get stuck I got mine stuck it just spins I forgot to put the bottom piece any tips?
A 25mm nut IS A 1 inch nut. It is NOT odd that they use a metric size here because they don't. Your 25mm wrench just fits like my 6 point 13mm socket fits fine on all 1/2 inch nuts.
25mm=.984 Inches, 1" socket will be slightly looser then 25mm socket.
13mm=.511 inches, 13mm socket will be slightly looser then 1/2" socket.
Yes you can tell the difference.
15/16 is the perfect size
I need something to cut through layers of foam, and I am having trouble finding the right product. I feel like these are way too strong for me though. Do you have any advice for something I can use?
Hot wire cutter?
@@JernD thank you so much, I’ll look into this! :)
@@cleanwristsnothips heat up a tuna can or can of beans
Since it's not a "beautiful" hole I'd rather use a holesaw...Just clamp a pre-drilled piece of scrap wood on the material if you're enlarging a hole...I bought the Greenlee set over 20 years ago and never used it and I think it's long gone....
Anyone else have an issue with the bit getting stuck in the metal box after it cuts through?
Good review
Magno po ang halaga
Buy yourself a set from Greenlee instead and avoid the headache
It's absolute garbage. My 1/2 inch punch worked the first hold but then got harder and harder. By the time I was doing my 3rd hole I noticed that one of the rises was worn down more than the other 3. I used it on a electrical panel box so it wasn't hard metal. If you want to waste your money then buy it.