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Tool Talk Discussion Forum

metal bandsaw problems

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deereford

02-26-2007 18:37:33




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I have a China made 4 X 6 metal band saw that keeps throwing the blade. I have set it up very carefully several times. It also cannot cut straight. I'm very frustrated with it and would like to replace it with something else, but it seems all of them in my price range are made in China. Any help would be greatly appreciated. Thank you very much!!




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huntingreen

02-27-2007 10:35:22




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
I have one and after setting the roller guides it cuts straight. Broke one blade from having the guide too tight. Bought blades at Harbor Freight for $ 11.00.



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Glen in TX

02-27-2007 09:47:00




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
Got one of those foreign made ones too and the cheap blades don't cut well on it. Replaced all the wheel and guide bearings and been using Starrett blades with good luck. Been getting those blades from mscdirect.com



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flying belgian

02-27-2007 06:45:47




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
check to see if the bearing or bushings are shot on blade wheels. I have a very high quality saw that worked perfectly for years and then started running blade off. I knew something had to have changed because it had worked fine. After some searching I found a bearing out. If that is the problem might as well replace both because second one is not far behind.



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Butch(OH)

02-26-2007 19:41:14




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
Some of the very cheap saws are so bad they will never cut right, been there done that. There must be a certain level of ridged to the thing and realy no way to tell from here if that is your problem. You can tell by eliminating other sources of your problem though. As mentioned blades are a concern and if you have the original blade in the saw replace it with a quality band from a known quality blade supplier like Morse, Lennox or Scanvic (any of those may be spelled wrong, LOL) I have got away from blades welded together at local suppliers as they seen to have a knack for getting them crooked or not welded or so darned hot that the teeth go away for an inch on both sides of the weld. factory welded blades are the way to go IMO and certainly for a test blade to check the machine. Also get the guides right, set the tension and speed right give it the test watching it as the cut progresses, if it cuts at an angle it will eventialy toss the blade, break the blade or bind in the cut if the part is large enough. If the blade comes off while running out of a cut then you have serious alignment problems that should be obvious when a straight edge is applied. Another thing I have seen when helping others is they kind of get it in their head that a band saw is an invincable cutting machine and they trash the band right off the get go and then cant figure out why it wont cut right. What will trash a band? Two biggest things I have seen is rust and slag/spatter from welding and torching. Following those in distant third is hardened steels. One fellow was using his saw to cut rusty rebar, about the nastiest stuff you could put in a saw. I always have two blades around, one for good, one for junk or iffy work. The junk blade is simply one taken out of "good" service before completly shot and hung in the shop for junk work later. All new blades are first used for cutting clean steel of known origin. Hope this helps.

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KEB

02-26-2007 19:29:52




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
I have one of those chinese things I bought used a number of years ago. One thing I found that really helped was setting the tension on the blade correctly. Don't remember where I came up with the setting, but tightening the blade tension adjustment as tight as possible by hand was about right. Made a big difference.

On the top (non-driven) wheel there's a rather crude adjustment for the angle of the wheel with respect to the blade. Took several tries, but was able to get it aligned properly. Between those adjustments & buying decent quality blades I haven't had a blade come off in a long time.

Keith

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MikeCatthemuseum

02-26-2007 19:20:25




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
First off, try a couple of things....

If your feed is too heavy, it'll jam and jump the blade. Try slacking the feed. This is usually via a screw and a spring that unload the blade to reduce blade pressure.

How many teeth per inch does this blade have and what are you cutting? If you can't get three teeth in the material at once, it's going to knock out teeth and jump the blade when it hangs up.

Next, how old is this blade. If it is the original Chinese blade and is more than two hours old, it's probably shot. If you have used it in materail that is too thin (see above) it has missing teeth and will hang up. A dull blade will never cut straight.

If you have a brand new blade and keep having the same problems, you ned to tweak your saw, if you can... Some of the cheap saws are adjustable so you can square the blade on both directions. Get a square and straighten both the vise and the vertical position of the blade. if you can't adjust the blade, get out a file or whatever and work on ti so you can.

If it still won't cut straight, it's the frame trunnion and your saw is crap. I had to scrap one that had this problem.

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Butch(OH)

02-26-2007 19:43:44




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 Re: metal bandsaw problems in reply to MikeCatthemuseum, 02-26-2007 19:20:25  
Sorry for stepping on your toes Mike, you posted while I was hunting and pecking



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Davis In SC

02-26-2007 19:17:50




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
Is there any kind of tracking adjustment for the wheels. If not, you might have to make some arrangement of shims, to get the wheels in line. When a bandsaw blade is tightened down, there are some huge bending forces put on the frame of the saw. Sort of hard to explain, but usually a few adjustment will make a blade stay on the wheels..



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Roy Suomi

02-26-2007 19:16:20




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
I've got a cheapo Duall bandsaw that threw the blade often..Found the gearbox has a brass bushing in it..The bushing got loose and allowed the shaft to tilt causing the problem..A buddy of mine has a machine shop , had him make the shaft longer and added a ball-bearing to the top plate of the gearbox..That and a new bushing fixed it right up



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chvet73

02-26-2007 19:14:01




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 Re: metal bandsaw problems in reply to deereford, 02-26-2007 18:37:33  
Yahoo has a group on these saws. Search the forum for posts on how to set your saw up. There's alot of good info on there. I used it on mine and it helped. Or you can join the group and post on there, I'm sure someone on there can help you. One thing I found on mine. Make sure you have a good quality straight blade or you will never get it to run right.



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