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As an ork player, I love to customize vehicles, convert stuff, etc etc. The rule book states when you're making a non-standard model, you have to make a vehicle with the same style of weapons. I.E. You cannot have a converted Demolisher with a turret-mounted Demolisher cannon. It MUST be hull-mounted.
I know there are a couple different ways to mount weapons, turret, pintle, hull mounted, maybe some others. What are the mechanical aspects of each one. In essence what differentiates how a pintle weapon points and shoots versus a turret-mounted, or a hull-mounted. (I know hull-mounted can't shoot in a 360 degree arc and is confined to a 45 degree arc.)

TL: DR - What are all the different weapon mounts and how do they act differently?

Weapon mounts are kind of an outdated mechanic, unfortunately. Instead of clearly defining how every gun should be mounted, you're supposed to look at the model to see at what angles the weapon can be fired at.

Basically what slow poke said. If the weapon is mounted in sch a way that it can pivot 360 while providing clear line of site to the target, then you have a 360 degree firing arc.

If it is mounted in such a way that it cannot be swiveled then it is limited to a 45 degree arc. There are a few exceptions such as the baleflamer on a helldrake that has been FAQ'd into a 360 arc.

Guard battle tank sponsoons 90degrees
Marine sponsoons 190degrees

What conversion rules basically are saying is if you want to convert a guard tank as example then you sponsoons must maintain their 90degree arc. And in general for all vehicles, a hull mounted has to remain hull mounted and so on from the official gw model

Then what in the instances of a vehicle with no model? What then?

It might benefit the conversation to specify the model in question: The Mekboy Junka.
It has three pintle-mounted Big shootas and there is no official model (at least so far as I am aware.) The pictures in the book seem to have the big shootas on the end of some large mechanical arms, essentially over-sized tech-marine servo-arms.

HIWPI.

If GW hasn't seen fit to provide a model then try to find the closest thing to the picture. If there is no picture then do whatever you want. Just be aware that an AV10 vehicle shouldn't fill an 8" x 8 " area...

Most (if not all) pintle mounted weapons are 360 arcs of fire. I think the only restriction is when the turret is in the way, like a predator's would be.

 Mulletdude wrote:
Most (if not all) pintle mounted weapons are 360 arcs of fire. I think the only restriction is when the turret is in the way, like a predator's would be.

True but you can mount the pintle gun in the tank commanders position on the turret its self

Ugh... this all sounds lawyery...

I play orks too. I mainly give it to them if they whine but the real rules are as follows:

If it's hull mount, 45deg
If It's turret/Pintle etc 360
If it's IG sponson 90
If it's Marine A little over 180 (see pic in BRB)
If it's Tau... apparently they can shoot into extra dimensions and ignore orthagonal targeting, line-of-sight, and cover... so much so that the Dark Lord Cthulhu (long may He reign) no longer get's his invulnerable save.

 ShadowMageAlpha wrote:

It might benefit the conversation to specify the model in question: The Mekboy Junka.
It has three pintle-mounted Big shootas and there is no official model (at least so far as I am aware.) The pictures in the book seem to have the big shootas on the end of some large mechanical arms, essentially over-sized tech-marine servo-arms.

Not to sound like a grot but is this a FW book??

Yes it is.

I think there are one or two pictures of mekboy junkas in IA:8. I think they based them off razorbacks.

Personally, as the junka is pretty much a super-looted vehicle, I'd say any way to mount a weapon on a rhino. chimera or leman russ chassis is fair game. Just put the big weapon upgrade somewhere on top and the three small weapons in sponsons/pintle mounted near a hatch/hull mounted on top or on the front.

Bottom line, ask yourself why you are mounting your weapon that way. If

There is a picture but it doesn't seem to follow the rules of the unit profile. Unless "big spidery mech-arms" now equate to pintles. Which is kind of the point I'm making. Hull weapons are pretty obvious. There doesn't seem to be anything that would allow much, if any, creativity with the placement of a Hull weapon. It's literally just a weapon glued to the hull of the vehicle. However pintle mounts seem a bit more nebulous given the "official" junka model. Is it modeling mostly just a factor of "as long as it doesn't change the arc of fire, it's fine"?

I would say those are most certainly classified as "pintle mounted" weapons, as a pintle mount is a very generic term for a weapon that is simply on a fixed mount that can be freely traversed and/or elevated while staying in one position.

Here's the best definition of the various vehicle weapon mounts tbh : http://en.wikipedia.org/wiki/Weapon_mount

If you've got 360 degree arc of fire and it's mounted to the vehicle in some fashion as described above (ie : on a "pintle") then it's a pintle mounted weapon. Without an official model to show otherwise, then some creative license should certainly be allowed as long as it's not over the top.

 ShadowMageAlpha wrote:
There is a picture but it doesn't seem to follow the rules of the unit profile. Unless "big spidery mech-arms" now equate to pintles. Which is kind of the point I'm making. Hull weapons are pretty obvious. There doesn't seem to be anything that would allow much, if any, creativity with the placement of a Hull weapon. It's literally just a weapon glued to the hull of the vehicle. However pintle mounts seem a bit more nebulous given the "official" junka model. Is it modeling mostly just a factor of "as long as it doesn't change the arc of fire, it's fine"?

Pretty much. The ork holding the big shoota in front is a perfect example of a pintle-mounted big shoota. It's a piece from the battlewagon set, which allows one out of three orks looking out of a hatch, with a big shoota attacked to the side, another shoota representing the exact same vehicle upgrade is a small grot turret, and two further ones are simply orks standing in the back of the battlewagon with their big shootas affixed to the armor. One upgrade, three representations.
The arms are kitbashs out of a kan skorcha and a battlewagon grabbin' klaw, which results in the same arc of fire as both the hatch-ork and the grot turret. I'd say those are perfectly legal representations of pintle-mounted weapons.

arent ork vehicles allowed to move their weapons as they see fit? literally the only description the battlewagon has for either size or weapon layout is "big metal monster with a ram or roller at the front" lol.

Least thats the way ive always viewed it.

Since the entire mounting thing got the axe in 6th, and unlike in the past, every vehicle is represented by an official GW model now, there is little point for GW to actually worrying about weapon mountings for them.

So there isn't really a permission to move weapons anywhere besides where the citadel instruction manual tells you to put them. RAW this means you may not.

If your self-made battlewagon has all its weapon on one 8" turret, you're probably get kicked out of store for that. If your Battlewagon has gretchin in little planes with big shootaz hovering around it, the rule of cool will make your model legal. Orks are not different from any other army in that regard. If it's not an official model, either get your opponent's(TO's) permission or count as if it were the official model.

It pretty much boils down to whether you want to mount a weapon in certain place because it looks cool that way or because it has the best firing arc. The former is fine, the later is not.