alllllllright, wait a dang sec. Using oil with a hacksaw?

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A friend of mine insists that you should use [any] oil (he uses olive oil) when using a hacksaw. He says that it keeps the blade from wearing out but does not impede the cutting.
I just can't quite understand this. I understand that the blade's job is to have the teeth bite (and not wear through the item via friction heat) but it just seems to me that oil will make it nearly impossible for the teeth to grab hold of the item.
Can anyone shed light on this?
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I've used WD-40. Cools the blade, cuts faster.
MJ
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On Sat, 19 Dec 2009 17:46:51 -0800 (PST), the infamous

Smokes, does it? Do you feed your arm Viagra before cutting?
HINT: If you use a sharp blade to start, it won't get very hot in the first place.
Unfortunately, I went 54 years before learning that simple lesson.
-- This episode raises disturbing questions about scientific standards, at least in highly political areas such as global warming. Still, it's remarkable to see how quickly corrective information can now spread. After years of ignored freedom-of-information requests and stonewalling, all it took was disclosure to change the debate. Even the most influential scientists must prove their case in the court of public opinion—a court that, thanks to the Web, is one where eventually all views get a hearing. --Gordon Crovitz, WSJ 12/9/09
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Hacksaw teeth will bite into metal just fine even if the cut is saturated with oil. The purpose of the oil is to keep from wearing the teeth out, and to reduce friction so that the blade doesn't heat up so much it loses its temper (toughness and hardness).
Try it sometime on a piece of scrap steel, say about 1/8" thick. Make one cut without oiling the blade, then another cut with oil on the blade. You'll find that with oil, it cuts faster and smoother with less pressure, less noice, and less heat.

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"Doug Miller" wrote

Sounds like a good, all purpose definition of lubrication.
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In article <b182bf3c-ebeb-431e-b4c1-

I don't use oil, I use something called 'cutting fluid' as sold by engineering supplies. Sure makes the drillpress bite better in hard/slick metals, I'm not going to give page-long testimonials for the efficacy with a hacksaw, but it seems to help. It also acts as a coolant for the cutting edge.
It does contain some light oil, not sure what else, I haven't looked at the blurb for a couple of decades. Also heard of people using kerosene for the purpose.
-P.
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My dad taught me to use kerosene to rinse glass cutters and lubricate and clean the surface when cutting glass. We cut a lot of glass in our hardware store during the many years we had it open.
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On 12/19/2009 4:35 PM Thomas G. Marshall spake thus:

Well, by your reasoning, no cutting tool--drill bit, milling cutter, broach--should cut if immersed in oil. But they all are when used in industrial cutting machines, so I guess the oil is good for the tool and good for the cutting operation.
For one thing, it helps flush chips away, as well as cooling things down.
--
I am a Canadian who was born and raised in The Netherlands. I live on
Planet Earth on a spot of land called Canada. We have noisy neighbours.
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Thomas G. Marshall wrote:

---------------------------------------------- "oil" provides a means of carrying away heat and "sloth" from the teeth of the blade.
Check out "cutting fluid", "cutting oil", etc.
Makes cutting metal a whole lot easier.
Lew
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David Nebenzahl wrote:

A cutting edge is basically a wedge--the lubricant keeps the pieces it's wedging into from seizing to it and lets them slide more freely against it, not to mention the cooling effect, which is important with metals.
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On Sat, 19 Dec 2009 22:29:05 -0500, the infamous "J. Clarke"

C'mon, guys. Cutting speed with a hacksaw is too slow to require coolant.
-- This episode raises disturbing questions about scientific standards, at least in highly political areas such as global warming. Still, it's remarkable to see how quickly corrective information can now spread. After years of ignored freedom-of-information requests and stonewalling, all it took was disclosure to change the debate. Even the most influential scientists must prove their case in the court of public opinion—a court that, thanks to the Web, is one where eventually all views get a hearing. --Gordon Crovitz, WSJ 12/9/09
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On Sun, 20 Dec 2009 07:49:47 -0800, Larry Jaques

Ever touch one just after a cut?
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Because something is hot to touch does not make it too hot for the metal. We as humans have a very limited range of comfortable temperatures. A metal hacksaw can go quite a bit farther without damage.
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In article <e9d8aaa3-b2fa-41f7-9514-

I've had them 'blue' and be hot enough to burn wood when I set them down.
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Same answer. The thermal tolerance of wood is in no way related to the that of steel.
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On Mon, 21 Dec 2009 05:44:03 -0800 (PST), "Thomas G. Marshall"

But "blue" is temper colopur. If you get steel hot enough to "blue" you have affected hardness/temper and damaged the blade. Absolutely NOTHING wrong with using coolant/lubricant on a hack-saw - and if you are attempting to cut aluminum it is a EXCELLENT idea as it keeps the teeth from "loading up"
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On Mon, 21 Dec 2009 07:53:47 -0500, the infamous phorbin

If you can blue a manual hacksaw by hand, you're our hero. More often, good blades have enough set to keep from binding in the cut and cool considerably during the stroke and the backstroke. Since I started using Starrett blades (the only Starrett thangs I can afford) I haven't noticed a blade hot enough to burn me after cutting angle iron. The stock itself is a heatsink, ferchrissake.
So, I still say "Put a new, sharp blade on that damned thing, phorbin."
-------------------------------------------- -- I'm in touch with my Inner Curmudgeon. -- ===========================================
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Larry Jaques wrote:

Come now, C-less ... that's not the point!
A 'caviler in the usenet wild' MUST take exception to ANY minute detail not specifically in lock step with a Google/Wikipedia source so that you can be publicly corrected whilst showcasing said caviler's 'superior than thou', hard won, Google expertise/knowledge.
You may also want to make a note of that other noted 'caviler in the wild' characteristic: never showing photographic evidence of anything personally accomplished.
--
www.e-woodshop.net
Last update: 10/22/08
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....................................yeah! What he said.
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On Mon, 21 Dec 2009 10:20:27 -0600, the infamous Swingman

Erm, OK.

Ah, got it. Oh, all this revelling (or is it reviling?) with those pesky cavilers has me tired. G'night, Chet.
-- REMEMBER: The sooner you fall behind, the more time you'll have to catch up!
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