FWIW Mr. Max the only part I "made" was the diffuser bucket. It is just a 5 gal plastic bucket with a lid. The hose to the dust collector is 4" dryer vent hose. The bucket could be simplified by just drilling two holes in the top, sticking the dryer vent hose through them and sealing it with duct tape.
Or, you could just eliminate the bucket and just have a piece of hose going to the dust collector. The only reason for the bucket is a home-made spark arrester. When the grindings pass through the hose they get sucked into the fan of the dust collector and blown into a bag. That's a LOT of air movement. I would think that any tiny sparks from sharpening would be totally cooled off on their journey through the hose/dust collector fan. At least in my case knife sharpening rarely, if ever, produces sparks let alone large enough sparks to not burn out when passing through the hose/collector fan.
The chances of knife sharpening sparks being a fire hazard are greatly reduced if the system is only used for sharpening and not woodworking. It's a really bad idea to have a combination wood dust/metal dust collector as the wood dust is most likely to catch fire. I have not put water in the bottom of the bucket for years, mainly because there just don't seem to be any sparks generated when I sharpen.
The little HF dust collector sucks air into the input hose, directly into the collector fan and on into the filter bag. It moves 660 CFM of air so any possible sparks are exposed to a lot of air before going into the bag. If you thought there was any possibility of some smoldering spark sitting in the bag you could just pull the bag off the collector and put the bag in a metal can when you are finished.
Without the bucket, it's just attach a hose to the dust collector and plug it in. Anyway, it's just an idea.
The air filter you pictured is just a room dust dust filter. I don't think it would be very efficient sucking grinding dust away from a sharpening machine. Better than nothing but it's a room air filter, not a dust collector.
Or, you could just eliminate the bucket and just have a piece of hose going to the dust collector. The only reason for the bucket is a home-made spark arrester. When the grindings pass through the hose they get sucked into the fan of the dust collector and blown into a bag. That's a LOT of air movement. I would think that any tiny sparks from sharpening would be totally cooled off on their journey through the hose/dust collector fan. At least in my case knife sharpening rarely, if ever, produces sparks let alone large enough sparks to not burn out when passing through the hose/collector fan.
The chances of knife sharpening sparks being a fire hazard are greatly reduced if the system is only used for sharpening and not woodworking. It's a really bad idea to have a combination wood dust/metal dust collector as the wood dust is most likely to catch fire. I have not put water in the bottom of the bucket for years, mainly because there just don't seem to be any sparks generated when I sharpen.
The little HF dust collector sucks air into the input hose, directly into the collector fan and on into the filter bag. It moves 660 CFM of air so any possible sparks are exposed to a lot of air before going into the bag. If you thought there was any possibility of some smoldering spark sitting in the bag you could just pull the bag off the collector and put the bag in a metal can when you are finished.
Without the bucket, it's just attach a hose to the dust collector and plug it in. Anyway, it's just an idea.
The air filter you pictured is just a room dust dust filter. I don't think it would be very efficient sucking grinding dust away from a sharpening machine. Better than nothing but it's a room air filter, not a dust collector.