Green Lee Knock Out Punch

[Bill Owen]

Greenlee Knock out Punches
Greenlee part # 730EBB-120 Last time I inquired, they were around $450 in the states + Large 3/4" socket wrench, and 2" socket. I wouldn't use anything less than 19" long socket wrench. Estimated purchase price of $550 new.

Threaded shaft of Knock-out punch

Knock-out punch blade

Ready to cut hole.

You need leverage. Using 19" Socket wrench to draw in knock-out punch balde

Clean Cut

 

[Mickey O]

How about a 120mm hole saw ($16.50) and an old file or Dremmel tool? I did a google search and there's a whole lot of discussions about making a clean 120mm hole.

On a side note I sometimes see the hydraulic pump for those Green Lee chassis punches at auctions quite reasonably bought, that would be nice for holes that large.

 

[rodm1]

Yes they are expensive but what is your point? Do you need an alternative?

 

[supertooljunkie]

The bad thing about a hole saw is the chips that can get into the panel. Those can cause flashover.
Harbour Freight has a hydraulic KO set, model 96718, for less than $100. This set goes from 3/4" - 2". Works very well. I bought one to do a Home Depot in Texas. I thought if it lasted one job and got tossed it would pay for itself. I have used it on three jobs and have a set of 4" dies it handles without any problems.

 

[supertooljunkie]

The HF set works with all of the Greenlee, Current, and Gardner bender dies and accesories.

 

[Stuey]

One of these days, Bill, one of these days... =P

 

[supertooljunkie]

Greenlee has several sets of knock out dies. Set 7238SB, Slugbuster is a ratcheting set 1/2" - 2" with the ratching wrench. They go new on the internet from $250 - 400. Lowes and Home Depot carry them. I believe the price is around $320.

I got mine off of ebay for $160 used.

 

[caper]

Is there a point to this thread?I see it's a new poster posting pics with his website advertised.Spam?No real question asked,just a bunch of pics advertising his site.

 

[Mickey O]

The bad thing about a hole saw is the chips that can get into the panel.

There's a few fancy high tech gadgets that can handle the chips, one's a vacuum cleaner, the other an air blow gun, could even use a magnet.

Those can cause flashover.

??????

 

[supertooljunkie]

There's a few fancy high tech gadgets that can handle the chips, one's a vacuum cleaner, the other an air blow gun, could even use a magnet.





??????

This is true if you are in a shop. You have access to a vacuum or air compresser. In new construction you don't always have that access.

Flashover. If you are making a hole in a live electrical panel with a hole saw, chips getting down into the breakers is not a good thing.

 

[Mickey O]

This is true if you are in a shop. You have access to a vacuum or air compresser. In new construction you don't always have that access.

Flashover. If you are making a hole in a live electrical panel with a hole saw, chips getting down into the breakers is not a good thing.

You're thinking of arc flash, flashover has to do with ignition points and arc flash wouldn't be an issue, maybe a short. Anyhow these are computer case frames that he's putting fans in and from the looks of it not the type of thing you'd be doing in the field.

The real question is why people are wasting money putting fancy fans on a computer, money that could be spent on tools.

 

[walrus]

Flashover. If you are making a hole in a live electrical panel with a hole saw, chips getting down into the breakers is not a good thing.

Probaly going to drill a hole to get the KO tool in there, so I don't see how you avoid it. Maybe one should de-energize the panel before modifying

 

[Bill Owen]

Yes they are expensive but what is your point? Do you need an alternative?

Nope, just love the "Clean Cut" no deburring needed

 

[Here2Learn]

I hope you didn't buy a $500 tool to make a hole in a computer case.

 

[Stuey]

I hope you didn't buy a $500 tool to make a hole in a computer case.

Just wait until Bill shows you the other tools he uses for his mods and modding products. His shop and tools, the aforementioned 4-1/2" SlugBuster included, are envied far and wide by the modding community. That's not even mentioning his revered skills.

If anybody could use a $500 knock out punch to its full potential "making holes in a computer case," it's Bill.

 

[Mickey O]

Just wait until Bill shows you the other tools he uses for his mods and modding products. His shop and tools, the aforementioned 4-1/2" SlugBuster included, are envied far and wide by the modding community. That's not even mentioning his revered skills.

If anybody could use a $500 knock out punch to its full potential "making holes in a computer case," it's Bill.

What's the modding community? Computer modifications?

 

[Stuey]

Yes, although modding also includes cases fabricated from scratch as well.

 

[Here2Learn]

OK, it is not a one time deal. Whew!

I am familiar with people "modding" cases and such.