Machining waste terminology: hole making

wagsha48 · May 23, 2017

I am familiar with chips, swarf, dross, and filings as well as some slang terms we tend to use like stringers, blue hornets, and even sticky wickies. What I am wondering currently though, is what is the technical term for the coin left over when a drill breaks thru? Feel free to post any other rarely spoken terms I may not be aware of.

WizardOfBoz · May 23, 2017

When you weld a nipple to a pipe, and put a 100% diameter gate valve on the thing, and then put an air tight hole saw on top of that, and open the valve, and cut a hole into the original pipe, and you pull the saw out, the round piece you have on your hole saw is called a "coupon". I vote for "coupon". But an electrical box knockout piece is called a slug.

RoBrown · May 23, 2017

We always refer to them as a slug. An old term for the disk is a chinaman's hat.

Bill D · May 23, 2017

When I took welding class at the JC the rectangular pieces of 1/2 plate roughly 4x6 to practice on were also called coupons. I would say cut not sheared or punched.
Bil lD

DMF_TomB · May 23, 2017

slug is most common name

wagsha48 · May 24, 2017

I see where slug could be fitting in some circumstances but IMO coupon is more fitting for the thin pieces like the ones in my picture. From now on I guess my rule of thumb will be: over 1/8" thick= slug, under 1/8" = coupon. I appreciate the tip, Been in the field 11 years now and have not heard the term.

tay2daizzo8 · May 24, 2017

just call it a booger

moonlight machine · May 24, 2017

Are you saving it for something? If not it is scrap.

adama · May 24, 2017

Slug or punching is the common term, over here suitably sized punchings are oftern sold for balast weight usage not scrap. They vibrate - compact down well and can be found in many a boat hull around these parts, yeah they tend to rust together as one mass, but still work just fine.

cyanidekid · May 24, 2017

wagsha48 said:
I see where slug could be fitting in some circumstances but IMO coupon is more fitting for the thin pieces like the ones in my picture. From now on I guess my rule of thumb will be: over 1/8" thick= slug, under 1/8" = coupon. I appreciate the tip, Been in the field 11 years now and have not heard the term.

offhand,I can think of no basis for "thin=coupon", what is your reference for that usage?

to my understanding, a "coupon" is a piece of specific dimension usually removed from a larger sample for the purpose of testing and/or archiving.

by definition a coupon is pay dirt, not tailings, workpiece, not byproduct.

slug it is.

trevj · May 24, 2017

cyanidekid said:
offhand,I can think of no basis for "thin=coupon", what is your reference for that usage?

to my understanding, a "coupon" is a piece of specific dimension usually removed from a larger sample for the purpose of testing and/or archiving.

by definition a coupon is pay dirt, not tailings, workpiece, not byproduct.

slug it is.

Ayup.

Cupon is the generic term for a small sample used for testing. Small, of course, relative to the actual job being done.

One shop I worked in, had a vidmar bin full of cupons of various materials, and thicknesses ranging from .010" on up, for the welders to practice their TIG welds upon, for their Annual required recert, which was welded in the shop and sent to a central facility where it was sectioned and etched, then graded for pass or fail.

But I have also seen cupons of very thick Aluminum, Magnesium and Armor Steel, also reserved for testing and practicing.

Those look like the slugs from an annular cutter. Just another chunk of waste material.

Cheers
Trev

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Machining waste terminology: hole making

wagsha48

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WizardOfBoz

Diamond

RoBrown

Plastic

Bill D

Diamond

DMF_TomB

Diamond

wagsha48

Aluminum

tay2daizzo8

Hot Rolled

moonlight machine

Diamond

adama

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cyanidekid

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trevj

Titanium

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