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post #241 of 1102 Old 01-19-2010, 08:31 PM
lumpster
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never heard of a ceramic drill, ill have to look into it. we have ceramic inserts, so ill assume the ceramic drill is for heat treated stuff?

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post #242 of 1102 Old 01-19-2010, 08:48 PM
Unlimited04
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Originally Posted by lumpster View Post
never heard of a ceramic drill, ill have to look into it. we have ceramic inserts, so ill assume the ceramic drill is for heat treated stuff?
sure you've heard of ceramic drills. Titanium Nitride (TiN) is a common ceramic coating on a HSS bit, even lower quality HF or hardware store drill bits. Titanium carbo-nitride (TiCN) is a common coating on high quality drill bits - usually for machining production stuff. there are also the uber-expensive high performance equipment that spins very high rpms, where even tool balance becomes an issue. Look up PCD (polycrystalline diamond) and CBN (cubic boron nitride). more: High Speed Drill Bits - Carbide Drill Bits
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post #243 of 1102 Old 01-19-2010, 08:54 PM
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Unlimited04, I thought you are such a liar. You can't be an engineer with all of this tool knowledge. Most of those idiots just make numbers look like they are doing something Jk. Our Off-topic talk (slightly, not that far off topic) is teaching me a lot about fab. I thought slow was a go for metal. I am somewhat used to the old school method for metal drilling though. We have a drill press that is set to turn very slowly, and that thing cuts through metal as if it was blasa wood (well, the bits that haven't been destroyed).

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post #244 of 1102 Old 01-19-2010, 09:29 PM
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Originally Posted by provelogear View Post

Weight is the number one reason why we want aluminum over steel. Add up all of the armor you plan or have on your Jeep and I bet you'll end up with a 5000 lb Jeep. My 04 Rubicon fully armored is 3950 lbs wet. Pretty close to stock weight. I'll bet I have a easier time on obstacles that a fully armor Jeep with steel.


5000lbs?

I weighed my jeep last Thursday at a truck stop because I needed an actual weight to help my trailer considerations.

Below is an abbreviated list of my weight adding mods, most likely what you are considering an armored up/modded jeep:

Stock TJ Sport -auto
Full replacement front steel tube fenders
Full steel crusher corners with 3" steel flare
Teraflex belly up
Rokmen heavy *** control arms
Currie HD Steering
Kilby Gas tank skid
Poison Spyder Front Stinger
Gen-Right Rear Stinger
Warn M8000 winch with steel winch line
Poison Spyder Trail Cage with Rear Spreader Bar
Rubicon 44 Front with 30 spline alloy shafts
Rubicon 44 Rear with 30 spline alloy shafts
37x13.5 Pitbull Rockers on 15x8 steel wheels. Each wheel and tire combo weighs ~110lbs and I have 5.
CO2 OBA Setup
Warn Rock Sliders
10" Sub and box

And my gas tank was half full.

Total weight 4220lbs with no driver. And that is with roughly 600lbs of wheels and tires.






Now, all of that said, I would love to get to under 4000lbs and if your armor is what will do it, I will most likely be stripping down a lot of my steel. That and your big brake kit, the 37"s push straight through the Rubi disc brakes on steep descents.

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post #245 of 1102 Old 01-20-2010, 11:01 AM
pjku79
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I know the weight is minor, but with all the talk about lowering the LCG of a rig, wouldn't taking the steal bumper and skid raise it?

97 TJ, d44 arb locked, 2.5" bds lift, 35" tires, JKS adjustable control arms
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post #246 of 1102 Old 01-20-2010, 11:42 AM
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Quote:
Originally Posted by Unlimited04 View Post
sure you've heard of ceramic drills. Titanium Nitride (TiN) is a common ceramic coating on a HSS bit, even lower quality HF or hardware store drill bits. Titanium carbo-nitride (TiCN) is a common coating on high quality drill bits - usually for machining production stuff. there are also the uber-expensive high performance equipment that spins very high rpms, where even tool balance becomes an issue. Look up PCD (polycrystalline diamond) and CBN (cubic boron nitride). more: High Speed Drill Bits - Carbide Drill Bits
that is stretching it, coating is different.


We have cutters at work that spin at 40k rpm, they do require balancing. but ill stick to my original statement. Ive never heard of a ceramic drill before.
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post #247 of 1102 Old 01-20-2010, 03:08 PM
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Originally Posted by pjku79 View Post
I know the weight is minor, but with all the talk about lowering the LCG of a rig, wouldn't taking the steal bumper and skid raise it?
The amount of weight in a bumper or skid that you lose is negligible to the CG. If you changed from all steal bumpers and armor to all aluminum, you may notice a difference. But I doubt the CG would change enough to notice. You'd feel your Jeep become nimble again.

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post #248 of 1102 Old 01-20-2010, 06:54 PM
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i think a full aluminum jeep would be alot less than 3900lbs...
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post #249 of 1102 Old 01-20-2010, 07:04 PM
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you could get away with alot less motor too, a big CI 4 banger, or a forced induction 4 banger would be good
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post #250 of 1102 Old 01-20-2010, 07:05 PM
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i think a full aluminum jeep would be alot less than 3900lbs...
Actually, you are probably right. I think my original estimation was way off. I think a stock TJ weighs something like 3,500 lbs. If you figure that a well designed aluminum structure can weight abotu 25% less than an equally built piece (just throwing out a number there), that is like saying that we will save about 1k off of a 4k rig. So... that is more like 3,000 lbs.

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post #251 of 1102 Old 01-20-2010, 07:06 PM
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Quote:
Originally Posted by lumpster View Post
you could get away with alot less motor too, a big CI 4 banger, or a forced induction 4 banger would be good
Which would be even lighter! Or an all aluminum 4 cylinder would be better still.

USAF
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post #252 of 1102 Old 01-20-2010, 08:10 PM
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there are times I wish I didn't live on the east coast...and that I made a donkey load more money than I do...damn...I'd like to be SAVVY...someday...

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post #253 of 1102 Old 01-21-2010, 10:04 AM
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BAM!...........just purchased the UCF 1/4" Carbon steel Belly up! I figured that a coat of paint will keep the rust away, and that extra 40 lbs or so over the aluminum one won't change my CG enough to account for the higher expense of aluminum. Cant wait!! btw, UCF seem to be really good at sending confirmation emails and status reports...good PR!

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post #254 of 1102 Old 01-21-2010, 10:24 AM
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Why is it that people seem to think weight is purely about center of gravity?
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post #255 of 1102 Old 01-21-2010, 11:02 AM
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Quote:
Originally Posted by Firekite View Post
Why is it that people seem to think weight is purely about center of gravity?
Because someone has coined LCG as a term that is supposed to mean something.

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