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Does anyone here have a 4 inch cannon and wants some free prototype shells?

Last post by JimmyT « Wed Mar 25, 2026 2:29 am

by JimmyT » Wed Mar 25, 2026 2:29 am » in General Cannon Discussion

I recently got a 4 footer of 1 inch allthread rod, and I intend to use it for the good of mankind. (I'm going to be making some big ass sabot rounds...

0 Replies

5318 Views

Last post by JimmyT
Wed Mar 25, 2026 2:29 am
Semi reusable threaded rod APFSDS

Last post by JimmyT « Mon Mar 23, 2026 8:56 pm
Replies: 6
by JimmyT » Fri Jul 04, 2025 2:57 pm » in Ammo & Materials

First post

So, I was thinking of ways to make APFSDS rounds for air cannons, and I realized that threaded rod is basically pre machined to have sabot interface...

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How's it going people. Someone asked me to design a projectile made to carry lines without tumbling. I've made a new sabot and fin setup designed to...

6 Replies

89756 Views

Last post by JimmyT
Mon Mar 23, 2026 8:56 pm
Hybrid disk burst pressure effect on performance

Last post by Lumines « Sat Mar 21, 2026 4:42 am
Replies: 26
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by jackssmirkingrevenge » Sat Nov 11, 2023 12:53 am » in Hybrid Cannons

First post

One of the experiments I've done with this project to to see how burst disk strength influences performance. Intuitively one would tend to think that...

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This is very interesting. Intuitively, the highest pressure accumulated before burst would live result in the highest velocity.

It would stand to...
26 Replies

301606 Views

Last post by Lumines
Sat Mar 21, 2026 4:42 am
Stepper Motor Heat Issues

Last post by karlsinner « Mon Mar 16, 2026 11:10 pm
Replies: 1
by Allen58 » Tue Jan 20, 2026 1:30 am » in General Cannon Discussion

First post

I know absolutely nothing about stepper motors. I bought a NEMA 17 stepper motor (17HS8401- ), with a nominal rated current of 1.7 amps. I did some...

Last post

Using 24V with a DM542 stepper motor driver to run a NEMA 17 stepper motor is normal because the driver controls the current, not the voltage....

1 Replies

39942 Views

Last post by karlsinner
Mon Mar 16, 2026 11:10 pm
BlasterSim

Last post by btrettel « Fri Mar 06, 2026 5:50 pm

by btrettel » Fri Mar 06, 2026 5:50 pm » in General Cannon Discussion

BlasterSim is my pneumatic and spring gun simulator. I've been slowly developing this since last year and have decided it's finally ready for a wider...

0 Replies

12256 Views

Last post by btrettel
Fri Mar 06, 2026 5:50 pm

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