How Feasible is it to use 3D Printing to Maintain Military Assault Rifles?

In ‘Additive manufacturing for field repair and maintenance of the assault rifle AK5C – a feasibility study,’ Master’s student Emmelie Simic of Uppsala Universitet (Sweden) explores the feasibility for using such technology in connection with Swedish forces who might be stationed in areas such as Mali or Afghanistan.

Simic points out that the Swedish Defense Materiel Administration (FMV) is responsible for supplying their armed forces with material, and 3D printing could very possibly be in their best interest. She also considers that the European Defence Agency sees potential in using 3D printing and additive manufacturing to ‘improve the defense capabilities’ due to the chance for greater:

  • Mobility
  • Sustainability
  • Power
  • Protection

All the above are relevant to both field maintenance and repair, especially if they bring about a ‘reduced logistic burden.’ With the ease in creating on-demand spare parts offered by 3D printing, the Swedish armed forces could benefit greatly for maintenance of so many different military aspects – from boats and planes to ammunitions.

“When equipment is used over time it tends to break,” states Simic. “This is why the Swedish armed forces is severely impaired without spare parts in field.”

Many systems in the military may be so old also, that spare parts have become obsolete—and this is a topic we have touched on numerous times regarding why 3D printing is so critical to maintenance endeavors; in fact, along with following projects where obsolete 3D printed parts have been created to finish projects such as returning older vehicles to new condition, we have also noted militaries for numerous countries using the technology to fabricate parts such as the Dutch Army and Taiwanese defense forces.

Simic has chosen the assault rifle of choice for the Swedes, the AK5C, as a prime example of how 3D printing could be used to benefit the military. This weapon has both semi-automatic and automatic modes, and each setting affects the rifle differently, according to Simic:

“For semi-automatic fire, the hammer is released and thrown against the rear part of the spark plug, the spark plug is pushed forward and the cartridge fires. After that the hammer is brought back to the tightened position where it is hooked up by the hammer latch. Automatic fire has almost the same principle, except that the hammer of the rifle is against the rear of the spark plug during the whole time when firing until the trigger is released. Then the hammer is brought back to the tightened position the same way as for semi-automatic firing.”

“Since the hammer-axis works as an axis for the hammer to rotate around, it is more affected during semi-automatic than automatic firing. This is because for every round that is fired in semiautomatic, the hammer goes back and forth around its axis, causing friction and wear, whereas for automatic fire, it only goes up every time the trigger is pressed.”

The AK5C rifle, the Swedish soldiers’ primary field arm.

Another problem area for added wear and tear is the hammer axis, subjected to enormous amounts of movement, exposing it to friction and causing so much wear that it may break. The gas cylinder is a part that also takes a lot of the heat too, literally, along with large amounts of pressure—causing the material to break down eventually. The magazine follower in the plastic magazine is another area that breaks down easily due to repetitive use.

The hammer axis

The gas cylinder

The magazine follower from two different angles.

Simic outlines the different modes of 3D printing and additive manufacturing, adding that all the parts were made by Lasertech LSH AB in Karlskoga. DLMS processes (using the EOS M 290) were chosen for printing the metal parts, while SLS (using the EOS P 395) was used for polymers. A minor amount of post-processing and assembly was required.

The testing area.

Test results in firing the weapons showed that the 3D printing processes were successful, with some minor adjustments required to the gas cylinder, and added recommendations for materials, along with explaining difficulty in that area:

“Because of ethical reasons, since the components are part of a rifle, it was hard to find a company that offered to print the components. This caused limitations to which type of material that could be used for the parts manufactured in AM, and to the type of method.”

“To use additive manufacturing as a manufacturing process in the future for field repair and maintenance is very promising. In this case, it gave almost the same dimensions as the conventional methods, the components were of high quality and didn’t break during functional evaluation. To use AM in Mali or Afghanistan is probably possible with the method that were chosen here for the parts, but more evaluation and testing are needed,” states Simic.

For the future, Simic also suggests further evaluations regarding temperature issues during military use of the rifles and how parts might be affected, along with considering different materials and economic factors.

“In conclusion, additive manufacturing does allow for fabrication of functional spare parts – at least the ones evaluated here,” says Simic.

We would be curious to see how DED processes performed in such a role. Perhaps these would outperform DMLS (powder bed fusion, LPBF) in cost if they could handle the accuracy. The AK5C is a variant of the widespread FN FMC rifle so the study has broader implications than just Sweden. Maintenance, especially overseas, restricts modern militaries as does ageing equipment generally. This indicates that 3D Printing May have a broad role to play in maintenance and repair.

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Source / Images: ‘Additive manufacturing for field repair and maintenance of the assault rifle AK5C – a feasibility study‘]

Senvol Joins National Armaments Consortium

The National Armaments Consortium (NAC) is the industry and academia component of the Department of Defense Ordnance Technology Consortium (DOTC), and serves as the primary organization enabling the US government, industry and academia to deliver rapid armaments innovation for the security of the United States. Originally, DOTC was commissioned by the Under Secretary of Defense for Acquisition, Technology and Logistics as a US Department of Defense (DoD) initiative. The goal of the consortium was to facilitate collaborative government, industry and academic ordnance technology development and prototyping.

Nowadays, the mission of DOTC is to enable the DoD Ordnance community to work collaboratively in RDT&E of prototype solutions to advance and transition ordnance systems, subsystems and component technologies.

The newest member of the NAC is Senvol, a company that provides data to help companies implement additive manufacturing. Its services include the Senvol Database, a comprehensive database of industrial additive manufacturing machines and materials; the Senvol API, which provides raw access to the Senvol Database; and the Senvol Indexes, pedigreed data sets for additive manufacturing material characterization. Senvol also offers the Senvol SOP, a standard operating procedure that details how to generate pedigreed additive manufacturing data, and the Senvol ML, a software suite that helps companies quickly characterize or qualify additive manufacturing materials and processes.

“We’re pleased to join the National Armaments Consortium and look forward to contributing to the advancement of armament technologies in the United States,” said Senvol President Zach Simkin. “Senvol is the leader in data for additive manufacturing, and we’re eager to support the consortium’s mission through the use of additive manufacturing analytics.”

Government participants in DOTC include US Army AMRDEC, Naval Surface Warfare Centers, Defense Advanced Research Projects Agency (DARPA), and Naval Air Systems Command. Technological areas of focus for DOTC include Ammunition, Demilitarization, Directed Energy Warfare, Enabling Technologies, Energetic Materials, Fuzes, Joint Insensitive Munitions, Protection & Survivability, Rockets, Missiles and Bombs, Sensors & Sensor Systems, Warheads Lethal Mechanisms, and Weapon Systems.

Recently, Senvol began developing additive manufacturing software for the US Office of Naval Research, and its membership in the NAC further advances the company’s status as a provider of AM data services to national security interests, not just private companies. Senvol is a Gold Member of America Makes, and its executives have been appointed to multiple leadership positions including as members of SME’s Additive Manufacturing Advisory Board, the ASTM International F42 Committee on Additive Manufacturing Technologies, ASME’s Technical Advisory Panel for additive manufacturing, and also as Vice Chair of the Data Management Committee for SAE.

NYC-based Senvol’s products and services have been used by a wide variety of Fortune 500 companies and government agencies in a range of industries such as aerospace, automotive, oil and gas, and consumer products.

In other weaponry news, you may recall Cody Wilson, who has been embroiled in a legal battle ever since he first published the open source files for his 3D printed handgun on the Internet. He was ordered by the State Department to remove the files, which he did, but then filed a lawsuit against the State Department claiming that it was violating his right to free speech, among other rights. After a long, drawn-out battle, it looked as though Wilson was going to lose his case.

However, things took a turn in his favor a couple of months ago when the Department of Justice offered Wilson a settlement. Confirmed in court documents this month, the settlement promises to change the export control rules surrounding any firearm below .50 caliber, with exceptions for fully automatic weapons and rare gun designs that use caseless ammunition, and hand over their regulation to the Commerce Department, giving Wilson freedom to publish data about his gun designs anywhere online. You can learn more about the case with in-depth coverage from Wired.

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