Obi ANH Grenade long groove symmetry etc.

[Serafino]

Seth asked this in another thread, we may as well talk about it in public in case anyone wants to go along for the ride.

[Roman's] saber with the bevelled emmiter and asymetrical grenade but be more like what they did with re-releasing the mini weathered ANH, which looked JUST like the previous mini saber.

Seth
[/b]

Asymmetrical is not more accurate, and Roman's are not asymmetrical, FWIW.

[/b][/quote]

What I meant were the cuts on the grenade that curved inward like this:

[attachmentid=10670]

Since MR's grenade, and some older replica grenades, has all the cuts straight, I thought that was what "symmetrical" meant and Roman's "asymmetrical" because they had those curved/beveled cuts.

I guess I was wrong, could someone PM me pics comparing symmetrical and assymetrical grenades? Thanks in advance!

Seth
[/b][/quote]

This is a bit exaggerated, but should clear things up (please note that the lower cross-section view of a 'symmetrical' grenade may or may not be accurate.):

 

[JunkSabers1138]

Thanks man.

So I guess an accurate grenade would have a mixture of asymmetrical and symmetrical cuts, right?

I already knew that real grenades had a mixture of bevelled and straight cuts, but I didn't really know what the terms "symmetrical" and "asymmetrical" meant.

Thanks again for your help.

Seth

 

[Serafino]

Just about all real grenades have asymmetrical cuts. (If you're focusing on the 'columns' of 'fragments' then they alternate straight-curved-straight)

The cuts are all the same type on any given grenade, they just alternate 'direction' when they're asymmetrical.

Until Chen's replicas came along, ALL machined replicas had symmetrical cuts.

Right when Chen was setting up his run, Jediscout found a grenade with symmetrical cuts and we had a huge discussion about whether the prop was symmetrical or asymmetrical. Chen ended up making both kinds.

I think it came out something like 65% for symmetrical and 35% for asymmetrical at the time, I have no idea who still thinks they were asymmetrical at this point.

So far I think the only replica grenades which have asymmetrical cuts are some Chens, the Parks, resin castings, and the brass cast grenade.

 

[ATL Kenobi]

I believe this picture helps illustrate the difference between the symmetrical and asymmetrical cuts:

My real grenade has asymmetrical cuts. As can be seen, one side of each beveled cut is actually "straight". IIRC, there was a thread a long while back that illustrated the dual beveled cutter that would have produced this appearance. The cutter would have been ran across the grenade body 4 times to produce the eight grooves.

The "mechanismo" image shows the symmetrical cuts, probably produced by a single "V" shaped cutter ran across the grenade body eight times to produce the groves.

ATL Kenobi

 

[Serafino]

One can find instructions on how to access the inert-ord siteÂ’s supplemental page with illustrations about that in the archived grenade thread.

 

[Prometheus]

Though not directly related to the topic, just thought this would make an interesting read regarding the #3 MK1

http://www.inert-ord.net/rod02h/no3/index.html

 

[Serafino]

That would be the aforementioned inert-ord site.

 

[Pulseriflefan]

very confuzing, so my grenade is correct ?

 

[ATL Kenobi]

Pulseriflefan,

IMHO, I believe the grooves on the body of your grenade are symmetrical and thus correct. Wanna trade? :lol

ATL


EDIT: :$ :$ I stand corrected, and have to agree with Serafino. Now that I look at it a little closer, yep, the second row of "nubs" are a consistent width all the way across. On a symmetrical type, the end nubs would flare out equally. :$ :$

 

[Killdozer]

Very pretty. Windvane's not quite right, though... you should give it away.

KD

 

[Pulseriflefan]

<div class='quotetop'></div>

IMHO, I believe the grooves on the body of your grenade are symmetrical and thus correct. Wanna trade?[/b]

Yes, please sent me your windvane





erm, what`s wrong with my windvane ?

 

[Serafino]

The grooves are asymmetrical and therefore not accurate.

The vane has the 'swept' type sleeve groove, and is therefore not correct.

But that is a fabulous grenade.

Does this help maybe?

[image]http://img290.imageshack.us/img290/9264/symasymjr2.jpg[/image]

 

[ATL Kenobi]

Here's another drawing similar to Serafino's sketch:

The top image is the symmetrical body, and the lower is the asymmetrical. To the right of each is a cross section and then what I believe the machining tool would look like.

ATL

 

[Serafino]

Cool ATL. Now I don't have to debate whether to grab the illustration from inert-ord to explain this from now on, I'll just borrow your excellent illustration.

Here's jediscout's symmetrical grenade, which is to date the only one I know of:

 

[Pulseriflefan]

now I see spoke the blind man . Thanks for the great illustration .

Indeed, my grenade is not symmetrical.

It have to do the job til I find another one

 

[OdiWan72]

Here´s my ´nade...asymmetrical, but I like it

Markus