40MM NATO (RD40X1/7) to MSA® Bayonet Filter Adapter

thingiverse

40MM NATO (RD40X1/7) to MSA® Bayonet Filter Adapter ============================================= This prototype design for a 40 MM NATO (RD40X1/7), gas mask thread, to MSA® bayonet filter adapter. The adapter should make RD40x1/7 threaded full face CBRN masks compatible with MSA® Advantage chemical, combination, and particle cartridges. Part Description: ============= 40MM_TO_MSA_BAYONET_ADAPTER_MONO.stl Single piece construction adapter, for MSA® Advantage filters that do not require clocking. 40MM_TO_MSA_BAYONET_ADAPTER_INNER_SHELL_LOW.stl 40MM_TO_MSA_BAYONET_ADAPTER_OUTER_SHELL_LOW.stl Two piece construction, not just for clocking purposes, but to also allow cross compatibility to outer shell of previous Gen 4 40 MM to 3M™ bayonet adapter. Tolerance are more forgiving, lower, to enable ease of 3D printer variation. 40MM_TO_MSA_BAYONET_ADAPTER_INNER_SHELL_HIGH.stl 40MM_TO_MSA_BAYONET_ADAPTER_OUTER_SHELL_HIGH.stl Two piece construction, not just for clocking purposes, but to also allow cross compatibility to previous outer shell of Gen 3 40 MM to 3M™ bayonent adapter. Higher tolerance parts requiring proper scaling and calibrated 3D printer. 40MM_TO_MSA_BAYONET_ADAPTER_MONO_GEN2.stl 40MM_TO_MSA_BAYONET_ADAPTER_INNER_SHELL_LOW_GEN2.stl 40MM_TO_MSA_BAYONET_ADAPTER_OUTER_SHELL_LOW_GEN2.stl 40MM_TO_MSA_BAYONET_ADAPTER_INNER_SHELL_HIGH_GEN2.stl 40MM_TO_MSA_BAYONET_ADAPTER_OUTER_SHELL_HIGH_GEN2.stl Gen. 2 features engraved markings to identify adapter. Disclaimers/Risks: ============== 1.) Use Proper Gaskets and Shimming Height Under Bayonet Maybe Required Requires gasket/o-ring, below bayonet to ensure proper seal between cartridge and bayonet. Source a gasket or O-ring with a nominal diameter of 25.5 mm or ~1.00". 2.) Perform Proper Negative Pressure Test Follow SSPs established by your institution or workplace for further guidance. But in general, don your respirator, adjust straps till taught against face, ensuring no obstructions around the periphery of the seal against face either due from hair, facial hair, or otherwise. Exhale deeply. Cover all inhalation ports. (Typically, most full face or half face respirators have two filters, so cover those intake ports with your hands. If your running only one filter, ensure the opposite port has filter cap in place.) Now inhale deeply. The mask should suck tightly against your face without any air leakages. Re-test if adjustments are required at gasket/o-ring interfaces at the adapter. 3.) Use At Own Risk – Temporarily Solution Only Until Supply Chain Normalizes 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals, heat, and UV/sunlight. 3D printing this adapter is only a temporarily ad-hoc solution against biological contagions. In addition to using a properly calibrated 3D printer, due to tolerances of adapters, if possible perform hot nozzle pass on all exterior surfaces, to reduce surface porosity. Highly recommended users apply a thin layer of polyurethane clear coat on all exterior surfaces, spray or dip based methods, to help resiliency and durability for repeated sterilization and to reduce fomite transmission in printed infill layers. Once supply chains return to normal, users should purchase OEM OSHA/NIOSH/EN standard approved respirators, adapters and accessories for their institution and workplaces. Dev. Notes: ========= 04/06/2020 - Initial model release. In work, pending support and feedback from 3D printing community for any fitment and model revisions. 04/14/2020 - Updated with engraved markings to easily differentiate between adapters. Credits: ====== Thanks to firescale for just releasing a MSA® to 3M™ bayonet adapter which I used to infer the MSA® male bayonet geometry.