Asked by: Meriame Siemon
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What is a hydraulic knockout punch?

Last Updated: 21st June, 2020

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A knockout punch, also known as a chassis punch, panel punch, Greenlee punch, or a Q-max, is a hand tool used to punch a hole through sheet metal. It is a very simple tool that consists of a punch, die, and screw. There are three different drive systems: manual, ratchet, and hydraulic.

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Likewise, what is a hydraulic punch?

Hydraulic punches are designed to perforate metal with round, square or oblong holes. Hydraulic punches may be powered by hand pumps, air/ hydraulic, gas, or electric driven pumps which develop up to 10,000 psi (700 bar).

One may also ask, what is knockout size? A knockout for 1/2" conduit is 7/8", but the outside diameter of a 1/2" EMT fitting is about 3/4". 3/4" knockout is 1-3/32" (close enough to 1-1/8), and O.D. of 3/4" fitting is roughly 1".

Moreover, who invented the knockout punch?

How do you use a knockout tool?

How to Use a Knockout Punch Set

  1. Drill a hole through the material, using a drill and metal-cutting bit.
  2. Fit the appropriate size of die onto the draw stud, then insert the draw stud into the pilot hole.
  3. Thread the desired size of punch onto the draw stud and hand-tighten it to the backside of the material.

Related Question Answers

Acindino Illas

Professional

How do you get rid of a knockout?

To remove a knockout, position the tip of a regular, blade-tip screwdriver just inside the edge, on the side opposite the attachment points. That ought to partially dislodge the knockout, allowing you to remove it the rest of the way by twisting back and forth until the attachment points snap.

Seckou Strickerschmidt

Professional

What is a knockout set used for?

Knockout tools—also called knockout punches—are a single-purpose tool designed to make clean, round, conduit-size holes in electrical boxes and panels. Once, this task was performed by drilling a small hole and reaming it to the required size. Electricians used step bits, metal-cutting hole saws and chisels.

Aragones Wieger

Explainer

How do you sharpen a knockout punch?

The punch part is the most difficult, I use a 1" belt sander, and an 80 grit belt. Sand the face of the punch, as best as possible. Don't sand the edge at all, it'll make it smaller, and it won't shear the metal being cut. The die part is really easy, just hit the face of it until the inner rim feels sharp.

Christene Niehof

Explainer

How do you fill a Greenlee hydraulic punch?

Pour Greenlee hydraulic oil* into the rubber bladder (12) until oil comes to the top of the plug hole. 5. Turn the release knob (16) to OPEN. Pump the lever (1) two or three times.

Yoania Dita

Pundit

What is a hydraulic knockout set?

Hydraulic knockout punch kits enable you to easily and quickly punch holes through a variety of tough surfaces, including steel, with their hydraulic rams (Source). It features an 11 ton hydraulic ram enabling you to safely punch holes in plastic, aluminum, fiberglass and steel that is up to 10-gauge.

Uliana Awrus

Pundit

Why does getting punched in the chin knock you out?

A punch to the jaw causes the head to suddenly spin around. This quick motion of causes trauma to the brain that knocks the recipient out leaving him unconscious. Points on the jaw that are especially vulnerable to knockouts are the sides of the chin, and where the jaw is attaches to the skull.

Asia Fontrodona

Teacher

Is being knocked out dangerous?

What are the long term effects of being knocked unconscious? It depends on the severity of the injury. If you lose consciousness briefly, and suffer a concussion, 75 to 90 percent of people will fully recover in a few months. But severe damage to the brain can cause unconsciousness for days, weeks, or even longer.

Mykola Schoonraad

Teacher

How long does a knockout last?

In most cases, a knockout lasts less than 10 seconds, after which the person regains consciousness. However, a bad knockout can last longer than a minute and even several minutes. The length of the knockout depends on the severity of the concussion and whether or not the brainstem was damaged.

Garoafa Sigli

Teacher

What happens if both fighters get knocked out?

If a boxer is knocked down, he loses a point. If a boxer is knocked down twice, he loses two points. If both fighters are knocked down, the knockdowns cancel each other out. While uncommon, if a fighter completely dominates a round but doesn't score a knockdown, a judge can still score that round 10-8.

Zaida Jodicke

Reviewer

What does KO mean in MMA?

In mixed martial arts (MMA) competitions, no time count is given after a knockdown, as the sport allows submission grappling as well as ground and pound. If a fighter loses consciousness ("goes limp") as a result of legal strikes it is declared a KO.

Cornelis Schalk

Reviewer

How do boxers not get knocked out?

Having your chin down gives your opponent's punches less leverage when they land on your head. If your head was straight up, the punch would immediately transfer to the head and at a perfect angle to “snap” the neck. Having your head in a forward position makes it less likely for frontal punches to knock you out.

Yamilet Fantino

Reviewer

Xabat Kalentiev

Reviewer

What is a one punch attack?

Sucker punch. A sucker punch (American English) (also known as a dog shot, coward punch, king hit or one-punch attack (Australian English) or cold-cock (American English)) is a punch made without warning or while the recipient is distracted, allowing no time for preparation or defense on the part of the recipient.

Nesrine Bossman

Supporter

What size hole saw do I need for 2 inch EMT?

For 2conduit, drill using a 2 1/2hole saw or 2conduit knockout punch (2.416″ or 61.5mm). For 2 1/2conduit, drill using a 3″ hole saw or 2 1/2conduit knockout punch (2.914″ or 74mm). For 3″ conduit, drill using a 3 5/8″ hole saw or 3″ conduit knockout punch (3.539″ or 89.9mm).

Seda Canterla

Supporter

What does nominal size mean?

Measurement. In manufacturing, a nominal size or trade size is a size "in name only" used for identification. The nominal size may not match any dimension of the product, but within the domain of that product the nominal size may correspond to a large number of highly standardized dimensions and tolerances.

Felicisimo Glocker

Beginner

What is the outside diameter of 3 inch EMT?

ACTUAL OUTER DIAMETER
THIN WALL INCH SIZE (E.M.T.) ACTUAL OUTSIDE DIAMETER
2 1/2" = 2.875"
3" = 3.500"
3 1/2" = 4.000"
4" = 4.500"

Ada Jodokus

Beginner

Is electrical conduit measured by ID or OD?

The ID and OD
For instance, a 1-inch rigid conduit will have an ID of 1.063 inch nominal while a 1 inch intermediate metallic conduit will have an ID of 1.12 inch nominal, yet both have the same knockout size of 1.375 inches.

Douaa Malmierca

Beginner

What is a hydraulic punch driver?

According to Buttkereit, the hydraulic punch drivers utilise special geometry punches which minimise both the cutting pressure and associated manual effort required for operation. With a pilot hole 10 mm in diameter, round knock-out punches are available for standard cut-outs PG16, M16, M20 and M25.

Linnie Forsh

Beginner

What is the outside diameter of 2 EMT?

EMT Weights and Dimensions
Trade Size Designator Nominal Wt. per 100 Ft. (30.5m)
2 53 148
2 1/2 63 216
3 78 263