Global Scale Modeller

The inaugural challenge is a Cartridge.

This should be an unfired bullet and casing. Any caliber is acceptable from handgun to artillery. The model should be accurate and dimensions and type identified. I am not looking for your interpretation of a cartridge, but an accurate representation of something real. If possible also show any machinist drawings you used to create the model.


If you missed the explanation of these "Challenge" posts see the main thread here.

I've only briefly tried Sketchup and I'm a novice on Fusion360 but will give it a shot, no pun intended. I made a start but I'm stuck on the end the hurts when it hits you, the bullet!
The shape is giving me a headache as I cant remember how to do it. I managed to sketch out the casing and I'm currently trying to add to the firing end.
mark

The area from the large tube to the bullet end should have a straight slope of 40% (Alfa) instead of a fillet, also the Delta angle
(308 Winchester)


mark

Casper wrote: Tue Mar 23, 2021 9:33 pm The area from the large tube to the bullet end should have a straight slope of 40% (Alfa) instead of a fillet, also the Delta angle
(308 Winchester)


mark

H2 or G1 doesn't look right the step down is too large.

Do you mean the Alfa angle, it doesn't your right and the fillet doesn't help instead of a sharp angle

I'm trying to enter a loft from two points on the pointy end but for some reason (my fault) it just wont do it. gonna be something simple probably

Casper wrote: Wed Mar 24, 2021 1:30 am I'm trying to enter a loft from two points on the pointy end but for some reason (my fault) it just wont do it. gonna be something simple probably

Are you starting from a sketch, or using the cylinder tool?

bfrd wrote: Wed Mar 24, 2021 1:33 am

Casper wrote: Wed Mar 24, 2021 1:30 am I'm trying to enter a loft from two points on the pointy end but for some reason (my fault) it just wont do it. gonna be something simple probably

Are you starting from a sketch, or using the cylinder tool?

I started with a cylinder tool but then started with two circles, when I select loft points 1 and 2 and enter a distance nothing happens

I made an 8x57 Mauser cartgridge.

This is the technical drawing that I used.


I created a sketch and drew the profile according to my tech data. When entering the length data Fusion does simple math so I just entered the diameter values provided and added " / 2" to get the radius.


Then it was just a matter of using the Revolve tool and selecting my profiles. I used the Appearances to give it a more realistic look.

cool
just like that
You make it look and sound easy Matthew.
I Take ages not using the software that much and having an old walnut as a brain I tend to forget things. Its a fantastic bit of software and great fun to play around with but complex shapes and the different tools etc take some getting used to and I'm very much a beginner. Love the rendering in Brass. Looks like you did a 2d sketch and used a mirror tool but not really sure
Am I going about it the wrong way starting with a cylinder? Oh and sorry, I posted in the wrong thread
mark

Very nice work, although the ogive of the bullet appears incorrect. The 8x57 Mauser wasn't a Spitzer bullet.

Have you also drawn the primer, primer pocket and markings on the head? That would be cool.

Wish I could do stuff like this.

MrBowcat wrote: Wed Mar 24, 2021 4:08 pm Very nice work, although the ogive of the bullet appears incorrect. The 8x57 Mauser wasn't a Spitzer bullet.

Have you also drawn the primer, primer pocket and markings on the head? That would be cool.

Wish I could do stuff like this.

I got my hands on a partial crate of 8mm sniper ammo out of the former Yugoslavia. The tip may not be quite a sharp as I drew it, but fairly close. I haven't drawn the primer or its pocket, I need to dig out a round and look at the head markings. Haven't opened up the gun safe in a couple of years!

I know the feeling, I'm worried all my barrels will be rusty.

Still, got a club shoot at Bisley on 11/04/21, just hoping it won't be cancelled last minute.

I wonder if the ammo you had was the 7.92x57 Mauser, that did have more of a pointier Spitzer bullet?

MrBowcat wrote: Wed Mar 24, 2021 4:33 pm I know the feeling, I'm worried all my barrels will be rusty.

Still, got a club shoot at Bisley on 11/04/21, just hoping it won't be cancelled last minute.

I wonder if the ammo you had was the 7.92x57 Mauser, that did have more of a pointier Spitzer bullet?

All 8mm is technically 7.92 isn’t it?

Quite possibly.

As requested, I added the headstamp and Berdan primer (I even modeled in the anvil on the case, but you can't see it).

That's so cool looks like you could fire it. Love the rendering matthew

excellent skills it looks very real.

This is all beyond my small intellect at the moment.

Unusually for.me, I'm with him mystified
Paul

Nice job on the headstamp. A lot of my 357 brass has the NNY mark.

Downloaded the Fusion360 and the very first lesson learnt was - I need to severely upgrade my PC. Takes 15 minutes for the program to load and then every mouse click is put the kettle on time... In defence of the PC - it was built in 2007.
So - rules me out of trying but if anyone wants to have a go at a Soviet 7.62x54R round I happen to have a belt of them in the PKM upstairs that I can get dimensions from....

RangerNeil wrote: Thu Mar 25, 2021 11:15 pm Downloaded the Fusion360 and the very first lesson learnt was - I need to severely upgrade my PC. Takes 15 minutes for the program to load and then every mouse click is put the kettle on time... In defence of the PC - it was built in 2007.
So - rules me out of trying but if anyone wants to have a go at a Soviet 7.62x54R round I happen to have a belt of them in the PKM upstairs that I can get dimensions from....

Ya me too
Plus I am a civilized Mac/Apple person who doesn't like to associate with those PC types and their highfalootin programs

Twokidsnosleep wrote: Thu Mar 25, 2021 11:36 pm

RangerNeil wrote: Thu Mar 25, 2021 11:15 pm Downloaded the Fusion360 and the very first lesson learnt was - I need to severely upgrade my PC. Takes 15 minutes for the program to load and then every mouse click is put the kettle on time... In defence of the PC - it was built in 2007.
So - rules me out of trying but if anyone wants to have a go at a Soviet 7.62x54R round I happen to have a belt of them in the PKM upstairs that I can get dimensions from....

Ya me too
Plus I am a civilized Mac/Apple person who doesn't like to associate with those PC types and their highfalootin programs

You can get it on Mac now I think

Casper wrote: Fri Mar 26, 2021 12:38 am

Twokidsnosleep wrote: Thu Mar 25, 2021 11:36 pm

RangerNeil wrote: Thu Mar 25, 2021 11:15 pm Downloaded the Fusion360 and the very first lesson learnt was - I need to severely upgrade my PC. Takes 15 minutes for the program to load and then every mouse click is put the kettle on time... In defence of the PC - it was built in 2007.
So - rules me out of trying but if anyone wants to have a go at a Soviet 7.62x54R round I happen to have a belt of them in the PKM upstairs that I can get dimensions from....

Ya me too
Plus I am a civilized Mac/Apple person who doesn't like to associate with those PC types and their highfalootin programs

You can get it on Mac now I think

Yes you can
I was just being a jerk

Twokidsnosleep wrote: Thu Mar 25, 2021 2:25 pm This is all beyond my small intellect at the moment.

Dude, you took the words right out of my mouth. I'm fascinated by this stuff but this thread is a real ignorance affirmation experience for me!

Stokesy44 wrote: Fri Mar 26, 2021 7:48 am

Twokidsnosleep wrote: Thu Mar 25, 2021 2:25 pm This is all beyond my small intellect at the moment.

Dude, you took the words right out of my mouth. I'm fascinated by this stuff but this thread is a real ignorance affirmation experience for me!

I can't think in 3d....CONCEPT ..won't compute.