techmay2007 Posted March 3, 2017 Report Share Posted March 3, 2017 Hi, first time posting anything. I have a scroll saw that just recently is giving me a problem. The hose that blows the dust away near the blade stopped working. I took out the bellows thinking it was that but its perfectly fine. No pin holes or tears. Nothing. the hose itself is also fine. When I put it back in place, it works a few hours but then stops again. I do the same routine as stated earlier and it works again for a few more hours. However, this time it appears to stop working all together. Still no rips, tears, holes or cracks. Any suggestions besides buy a new bellows would be appreciated. Thanks Cindy Quote Link to comment Share on other sites More sharing options...
Karl S Posted March 4, 2017 Report Share Posted March 4, 2017 If you are sure the bellows is good, then look at what operates the bellows and see if there is a problem with that part. Keep checking back to the source Quote Link to comment Share on other sites More sharing options...
Scrappile Posted March 4, 2017 Report Share Posted March 4, 2017 Cindy, welcome to the forum. Sorry you are having trouble with your scroll saw and even more sorry I can't help. I would suggest stating the make of scroll saw you have. Maybe some one has the same and can help. Quote Link to comment Share on other sites More sharing options...
Ron Johnson Posted March 4, 2017 Report Share Posted March 4, 2017 As a suggestion apply a touch of 3 in 1 oil with your finger around the inside edge of bellows and tighten up but don't over tighten. Quote Link to comment Share on other sites More sharing options...
JTTHECLOCKMAN Posted March 4, 2017 Report Share Posted March 4, 2017 What saw is it?? Can you see the action of the bellow when it is working and when it is not working??? There has to be a connection from the top of the bellow to the underside of the arm to pull it up and down. Maybe this came lose. Quote Link to comment Share on other sites More sharing options...
WayneMahler Posted March 4, 2017 Report Share Posted March 4, 2017 Cindy welcome to the forum. would check to see if there is a small crack or split in the bellows. Seems once it gets warmed up the problem shows. Just a thought. Quote Link to comment Share on other sites More sharing options...
crupiea Posted March 4, 2017 Report Share Posted March 4, 2017 I have a cheapo aquarium pump that works way better then the bellows system that comes with the saw. blights69 1 Quote Link to comment Share on other sites More sharing options...
hawkeye10 Posted March 4, 2017 Report Share Posted March 4, 2017 Hi, first time posting anything. I have a scroll saw that just recently is giving me a problem. The hose that blows the dust away near the blade stopped working. I took out the bellows thinking it was that but its perfectly fine. No pin holes or tears. Nothing. the hose itself is also fine. When I put it back in place, it works a few hours but then stops again. I do the same routine as stated earlier and it works again for a few more hours. However, this time it appears to stop working all together. Still no rips, tears, holes or cracks. Any suggestions besides buy a new bellows would be appreciated. Thanks Cindy Welcome Cindy; I don't use the blower that came with my saw. I have a cheap fan blowing across the table into another fan that has a filter on it. The fan that has the filter on it is a box fan that you can get most anywhere for less than $20. the other fad is about $20 also. Here is a picture that explains it better than I can. Quote Link to comment Share on other sites More sharing options...
techmay2007 Posted March 5, 2017 Author Report Share Posted March 5, 2017 Thank you all for the suggestions. I am using a Hitachi cw 40 that unfortunately is no longer available but I can still get parts. I am actually thinking of doing the fan idea. There are definitely no cracks or tears, and yet when I move the arm up and down manually I can feel the air coming out. Its just when its running there's nothing. Thanks everyone Quote Link to comment Share on other sites More sharing options...
JTTHECLOCKMAN Posted March 5, 2017 Report Share Posted March 5, 2017 That saw had a poor rating on the blower to begin with. It did not blow much air. So what is probably happening is the bellow has gotten worn out and too soft so it is not pumping up and down with any force now. May need to replace bellow. Or go with other suggestions. Quote Link to comment Share on other sites More sharing options...
CharleyL Posted March 5, 2017 Report Share Posted March 5, 2017 (edited) These bellows assemblies small check valves in the ends of the bellows that will cause these problems if either one fails to close and open for each puff. removal (if possible) and cleaning of these check valves is my best suggestion to fix it. The inlet check valve needs to close when the bellows is squeezed and open as the bellows is released. The check valve in the bellows exhaust needs to open when the bellows is squeezed and close when the bellows is released. If either check valve fails to work properly, you won't get air flow. Both check valves are little flappers that should move easily. A bigger example is a fire place bellows. If you have one or have access to one, look at the way it is made. There is a large hole in the center of one of the side pieces with a leather flap attached to cover the inside of the hole. This is the inlet check valve. It lets air into the bellows through this hole, but the leather flapper prevents the air from coming back out this way. When the bellows is released, this flap opens to let air into the bellows. When the bellows is squeezed the air inside the bellows pushes this flap closes tight against the inside of the hole. The air cannot get out this way, so it pushes the valve inside the nozzle open and comes out through the nozzle. These bellows pumps in scroll saws work with the same principle, although their size and appearance will be considerably different. Just knowing how they work is usually the key to figuring out why your's isn't working. Remove your bellows and hold it in your hands. Squeeze it and release it a few times, looking to see if it's valves are working or not. Then look closer at the valves while you squeeze and release the bellows and it should be easy to tell what valve is failing. If your air bellows cannot be fixed and you cannot buy an exact replacement for it, it's quite possible that one for a similar model saw can be used. Many look very much the same, but maybe with different mountings. As a last resort, epoxy might solve the mounting problem. Charley Edited March 5, 2017 by CharleyL Quote Link to comment Share on other sites More sharing options...
amazingkevin Posted March 7, 2017 Report Share Posted March 7, 2017 Hi, first time posting anything. I have a scroll saw that just recently is giving me a problem. The hose that blows the dust away near the blade stopped working. I took out the bellows thinking it was that but its perfectly fine. No pin holes or tears. Nothing. the hose itself is also fine. When I put it back in place, it works a few hours but then stops again. I do the same routine as stated earlier and it works again for a few more hours. However, this time it appears to stop working all together. Still no rips, tears, holes or cracks. Any suggestions besides buy a new bellows would be appreciated. Thanks Cindy It appears that your bellows for a Hitachi Hitachi CW40 Parts List and Diagram : eReplacementParts.com is no longer available.Maybe you could attach an aquarium air pump to your nozzle and be up and running now.Walmart has them. Quote Link to comment Share on other sites More sharing options...
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