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Because they're being sanctioned into the stone age and can't get all of the parts necessary, or at least it's very difficult?

Because they suck at it?

Could be any number of reasons.  Lots of countries haven't been able to develop nuclear weapons even though they're trying.

Better question-- why are they enriching U235 to 60%?

we've been led to believe the answer to that question - and readily drink that kool-ade

if the issues Cincy points out are true, why are they continuing the enrich U235?
just to bother Israel? just to give the Israelis a reason to kick their ass?  just to continue the sanctions against them

I just don't see the logic. 

well, EXCUSE me

my point is......... this has been going on for decades, maybe longer.
why haven't they created the bomb by now?

Because what The Daily Show, Mdot, and a lot of others conveniently leave out or just miss completely is that Israel has sabotaged Iran's capabilities repeatedly, shortly after they've made these announcements over the years.  This is according to our own intelligence services, not taking their word for it. 

It's probable they would've had nuclear weapons a long time ago if Israel didn't keep putting a banana peel on their floor.  This latest kerfuffle is just a more direct, less covert operation in an ongoing thwarting effort.  Whether or not you believe that or accept it as true, is up to you.  I'm just noting there are credible reports that each time somebody warned about Iran getting close to nuclear capability, somebody threw a wet blanket on their progress. 

Uranium is somewhat easier, but plutonium would be easier to hide, requiring less "footprint" in terms of centrifuges.  You need a special kind of reactor, the chemical ability to isolate Pu, and then the ability to concentrate Pu 239 (which can be done with centrifuges or gaseous diffusion).  Our plutonium was made in Hanford, Washington.  The uranium was enriched using a massive gaseous diffusion plant in Oak Ridge, TN.  

The "device" tested in July, 1945, as the former type because they weren't sure it would work.  The uranium bomb used on Hiroshima was never tested.

Anyway, I worry about plutonium perhaps more than enriched uranium.  This is why Arak is so important.  But even a small reactor can make Pu and could be hidden underground.

Uranium is somewhat easier, but plutonium would be easier to hide, requiring less "footprint" in terms of centrifuges.  You need a special kind of reactor, the chemical ability to isolate Pu, and then the ability to concentrate Pu 239 (which can be done with centrifuges or gaseous diffusion).  Our plutonium was made in Hanford, Washington.  The uranium was enriched using a massive gaseous diffusion plant in Oak Ridge, TN. 

The "device" tested in July, 1945, as the former type because they weren't sure it would work.  The uranium bomb used on Hiroshima was never tested.

Anyway, I worry about plutonium perhaps more than enriched uranium.  This is why Arak is so important.  But even a small reactor can make Pu and could be hidden underground.

Simple question.

Why is Iran enriching uranium to 60%?  

Imagine for the moment Iran had the capability to build a nuclear device in 2005, but no delivery system.  So, they focused on the latter.  Now, they pretty much have the latter in hand, so they choose to enrich to 60% NOW, not then, because it's a fairly quick step to 90%.  Now, they are "months" away, should they choose, to having enough enriched uranium (or Pu) to make a deliverable nuclear weapon.  It becomes an OPTION for them, even if they don't take it.

Being in the brink of making one is almost as good as having one.

Simple question.

Why is Iran enriching uranium to 60%? 

I gave you the answer.

I gave you the answer.

I know, that's why I didn't quote you and ask the question again.