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Old 07-20-2015, 01:39 PM   #22781
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Different hole saws cut different materials.

Are you limited to one saw? Can you switch saws when you reach the different materials?
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Old 07-20-2015, 01:46 PM   #22782
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Quote:
Originally Posted by Erat View Post
Different hole saws cut different materials.

Are you limited to one saw? Can you switch saws when you reach the different materials?
The bottom of the tiles are corrugated. Part of the cut involves going through both steel and concrete at the same time.

I guess what I'm asking is this: I know that a diamond saw is ideal for cutting through concrete. Will it also work on steel? Is it going to load up with tiny fragments of melted steel and become useless after the first cut?
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Old 07-20-2015, 02:16 PM   #22783
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Default How (and why) to Ramble On your domestic partner

Usually in industrial metalcutting we never recommend using diamond on steels because of the Carbon in the steel. And you know what Diamond is made of.

I've seen it used marginally in bi-metal cutting where the material is cast iron and aluminum (think of the top of a cylinder block with iron liners).

A good bi-metal hole saw with teeth is your best bet IMHO.
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Old 07-20-2015, 02:36 PM   #22784
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Usually in industrial metalcutting we never recommend using diamond on steels because of the Carbon in the steel. And you know what Diamond is made of.
So, the idea here being that the carbon content of the steel negates the otherwise insanely hard carbon of the diamond?

Or does it generate phosgene gas when you grind the two together?





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A good bi-metal hole saw with teeth is your best bet IMHO.
Like I said, these have worked for us in the past, albeit we destroy about one blade per hole.

What about carbide-tipped or carbide-grit saws? Are these no-go for the same reason?
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Old 07-20-2015, 02:44 PM   #22785
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Default How (and why) to Ramble On your domestic partner

Because the Carbon in the steel wants to become the Carbon in the diamond.

Carbide tipped would work better on the steel. Carbide grit or diamond grit works better on the concrete.

If you can get carbide tipped that'd likely be best choice.

Sorry, I'm answering on my phone and still haven't figured out the multi quote part of this app...

Good luck!
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Old 07-20-2015, 02:53 PM   #22786
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The floor of my house is oddly similar. And I had to drill through it.

The underside is corrugated steel (think 50x size ruffles potato chip scale) and it is attached to some kind of concrete-like masonry. I ended up using a HSS bit to get through the steel and then a masonry bit to get through the masonry and finally a long HSS bit to get through the above floorstuffs. This was easy at 1/2" hole size.

Is there any chance you could do a multi-hole circle with smaller bits to pop out the center? Or maybe you could use a cut-off wheel on the metal larger than the hole then switch to diamond?

I bet carbide will work fine through both materials.
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Old 07-20-2015, 03:04 PM   #22787
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The tiles are removable, right? Take them outside before cutting them with the pyrotechnics?

How neat does the hole need to be? Cut the steel on the corrugated side with a plasma cutter or oxy torch or something, then use the hole saw for the top? How much time are you willing to put into saving the cost of buying one saw per tile?

--Ian
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Old 07-20-2015, 03:07 PM   #22788
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Quote:
Originally Posted by codrus View Post
The tiles are removable, right? Take them outside before cutting them with the pyrotechnics?

How neat does the hole need to be? Cut the steel on the corrugated side with a plasma cutter, then use the hole saw for the top? How much time are you willing to put into saving the cost of buying one saw per tile?

--Ian
Well, that's kind of the problem...

I have a 10" wet saw down in the basement garage that we normally use to cut these tiles. On the room I'm working in now, however, they're going to deliver a new piece of furniture on the same day that the old one is moved out, so I just won't have time to remove the tiles and cut them the way we normally do. The holes are going to have to be cut in-place, as much as I'd prefer not to.

It's a logistical problem, not a technical one.
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Old 07-20-2015, 03:08 PM   #22789
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Joe, why not:

1) remove the tiles you need to cut (or just pull a few spares)
2) replace them temporarily (if need be) from unloaded area that can be cordoned off
3) take the loose tiles to an installer
4) have them cut them with their expensive professional tools




(Dammit, I always type too slow)
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Old 07-20-2015, 03:20 PM   #22790
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Quote:
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Joe, why not:

1) remove the tiles you need to cut (or just pull a few spares)
Because 24" squares of 1 inch concrete plus steel are heavy and cumbersome. And because Joe P isn't going to do that when the alternative is wasting 5 hole saw bits. And neither would I.
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Old 07-20-2015, 03:33 PM   #22791
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Joe,

Call the LENOX tech support guys and ask them. They build tools for this all the time and likely have something.

Technical Services 1-800-642-0010

I don't rep them but they have a good reputation.
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Old 07-21-2015, 03:49 PM   #22792
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Who the hell looks through the crack to see if a stall is occupied rather than giving the handle a tug? This happened to me three times in one sitting. I feel violated.
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Old 07-21-2015, 10:20 PM   #22793
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No wife, buy **** for my self.

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Old 07-22-2015, 07:14 AM   #22794
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Default How (and why) to Ramble On your domestic partner

So last weekend we absolutely destroyed a tranny on track. 6th and 5th let go first, nursed it through the race for 2 hours then it completely let go when shifting into 3rd gear. Locked up the rear for a bit then coasted back into the pits. When in neutral it will still lock up the rear every now and then when pushing or towing the car while making horrible death noises. Anybody else destroy an NC 6 speed yet?
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Old 07-22-2015, 08:57 AM   #22795
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Default How (and why) to Ramble On your domestic partner

Quote:
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Anybody else destroy an NC 6 speed yet?
Not me. But I've heard the NC 5speeds are stronger than the 6speeds, completely opposite of the NBs. But I could be wrong.
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Old 07-22-2015, 07:04 PM   #22796
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Well, although it's not surprising, it is disturbing. I bet you could make a buck or two creating a simple DIY on how owners can disable all outside communications on their new cars.

Hackers Remotely Kill a Jeep on the Highway?With Me in It | WIRED
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Old 07-22-2015, 07:08 PM   #22797
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Yep, and the vulnerabilities are being disclosed next month at Blackhat. One would hope these guys have disclosed to Fiat Chrysler AG before before the talk. Otherwise, just wait till /b/ decides its a good time to disable the steering and brakes on every new Cherokee in Socal or NYC during rush hour. For the lulz.
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Old 07-23-2015, 03:48 AM   #22798
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Yep, and the vulnerabilities are being disclosed next month at Blackhat. One would hope these guys have disclosed to Fiat Chrysler AG before before the talk. Otherwise, just wait till /b/ decides its a good time to disable the steering and brakes on every new Cherokee in Socal or NYC during rush hour. For the lulz.
Umm...jet fuel does NOT melt steel beams.
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Old 07-23-2015, 10:10 AM   #22799
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IDK what the effing nutrition thread has been renamed named these days, but this is an interesting piece on the changes in human diet during different periods in history.

The History of Man?s Eating Habits | Official web site of the Montignac Method

Please stick it in that thread, or in your ear, or ***, or whatever.
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Old 07-23-2015, 11:08 AM   #22800
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its still: can you pinch my awful fat rolls thread.
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