[Liang Jieming]

Ok I need to start this eventually. Gonna post the photos here as usual. Check back often!

Exploded view.

This post has been edited by Liang Jieming: 04 October 2005 - 09:51 PM

[keith]

Woo hoo!

I was goin through withdrawals.

[KristoCat]

Great to see you're working on these again, Jieming. Did you get more shelf space?

[Liang Jieming]

Hehehe no unfortunately not. I'm still shelf starved since I've also been accumulating lots of books lately. This is a pretty large treb so it'll just have to sit on the floor.

[keith]

Liang Jieming, on Sep 27 2005, 09:42 PM, said:

This is a pretty large treb so it'll just have to sit on the floor.

Cool. When do we get an update on your progress?

[Liang Jieming]

Ahhhh... been tied up, not the least due to my $@%$# harddrive crashing and losing all my old stuff in the process.

Ok, will start soon promise. I've been doing extra research on this treb to try and see if there are any illustrations or descriptions of it's transition to a HCW version (like that of the HuDun Pao).

[Ricker]

Liang Jieming, on Oct 23 2005, 09:02 AM, said:

Ahhhh... been tied up, not the least due to my $@%$# harddrive crashing and losing all my old stuff in the process.

Sorry to hear about your hard drive. That's one of the worst things that can happen. I hope you didn't lose too much and can maybe get some of it back from online.

Good luck on your research.

[Liang Jieming]

Well, yeah I've been trying to do just that. I'm pretty thankful that I've been so proliferic online. All my catapult pictures and my entire e-book were saved because of that.

Mainly lost all my raw image files and all the stuff I never got around to uploading to my yahoo group. :(

[keith]

That sounds really bad. What are raw image files?

[Liang Jieming]

Raw image files are the original scanned images in high res or the working images in the various photoshop layers during editing and stuff. Really sucks to lose all that. The images I've uploaded are all the finish images, all nicely touched up and pretty but if I needed to go and redo a certain image, I'd have to start from scratch again without the raw image file.

[keith]

Well, your pictures look good so you shouldn't need to go back and re-make raw files at least.. Are you going to start your Sijiao Pao design when you get back from bein on holiday?

[Possible genius]

You've got some awesome set-ups.

[Liang Jieming]

I'm back!!!! Ok, I'll get cracking on makin' it once I settle back down into the dredgery of the working life again. I'm still kinda in the holiday high. hehehe

[Liang Jieming]

Here it goes before Keith throws a fit and starts acting strange from withdrawal.


24th November 2005 - Bought some long pieces for the 4 main legs. This should be a fairly large treb if I'm to keep to the same scale as before. Will make this treb with two different throw arms to get both traction and hcw versions.


30th November 2005 - Got around to chopping them up into tiny bits and pieces finally. The problem I'm facing with this catapult is that it's traditionally a large catapult but it's absent of cross-bracing. The real SiJiao catapults had their legs buried into the ground. I obviously can't do that with my model, and if I just simply cut and joined pieces together it won't last very long so I need to socket joints. Took awhile to get the dimensions right.


1st December 2005 - This is the most tedious part. Spent about a hour cutting and sawing out all the sockets and slots.


2nd December 2005 - Assembly of the two main frames and machining of secondary members.


3rd December 2005 - The frame is almost complete. Will need to start on the throw arm next.


5th December 2005 - Pivot completed.


6th December 2005 - Throw Arm (Traction Version) -7 Bamboo rods tied together


12th December 2005 - Throw Arm (Hinged Counterweight Version) -7 Bamboo rods tied together


13th December 2005 - Counterweight bucket

This post has been edited by Liang Jieming: 13 December 2005 - 08:03 PM

[keith]

Two different throwing arms? This'll be great. Which one do you think will perform better?

Liang Jieming, on Nov 23 2005, 09:42 PM, said:

Here it goes before Keith throws a fit and starts acting strange from withdrawal.

Hey, I resent that! I'm always strange..... I haven't been around for awhile, so I guess I already started to withdraw.

[Liang Jieming]

Both types have their own strengths and weaknesses.

Traction - easy/fast to transport, construct and setup, fast reloading, easier to adjust catapult throw range/projectile weight, throws only relatively lighter projectiles, needs a lot of manpower

Counterweight - counterweights difficult to transport, construct and setup, slow reloading, fixed range/projectile weight, can throw relatively larger projectiles, light in manpower

[keith]

The traction sounds a lot better to me.

[Possible genius]

I think a good way of thinking about it is, traction trebs are good for infantry and such where as counterweight trebs can demolish walls and throws deseise ridden animals and flaming projectiles over walls.
That's my take at least


Hey Jieming, thanks for posting these pics and all. I think I they will help me in the future. What do you use to machine the wood? Hand or power tools? Router? The tools you wouldn't want to go without.

[Liang Jieming]

Usually all by hand... a powerdrill sometimes when I need a really long, straight hole.

[KristoCat]

Very impressive!