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Band saw blade comming off pulley

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chris stephens17/11/2009 18:34:12
1049 forum posts
1 photos
Hi JimK,
Easy to explain and fix. The best analogy and fix is to think of a waist belt. If you buckle your belt into a circle (your bandsaw blade) then twist it so that the inside is now on the outside, that is how you make the teeth go the Right/Wrong way. As they say in the advert "simples". What probably  happens is they unroll the blade the wrong way when they join the two ends together by welding , but don't check afterwards.
Best to check before fitting, saves a wasted call about how your shiny new blade doesn't cut as well as you hoped.
 No, my Nemesis (no names but you know who you are), I did not find out the hard way, some people are just naturally observant !
chriStephens
Niloch17/11/2009 21:16:11
371 forum posts
Posted by Chris Gabel on 17/11/2009 17:52:30:

 
Does anyone have any experience with the Evolution/Rage TCT cut-off saws?   Their  sales  video on their website looks impressive,  and the saws are close to the same price as the cheap  bandsaws.
 
 
 I'm always being asked to do lots of DIY by our two sons-in-law who both live a dozen miles away so I bought one of these Evolution/Rage saws as a 'family' saw to keep over there.  Bought it at B&Q when they had a special offer and then got the wrinklies 10% discount on top on a Wednesday morning  -  a smidgin less than £120.  So far it's helped with laying two oak floors, one pine floor, a pine deck and the small matter of a stainless steel curtain pole as well as 15mm copper pipe.
It appears to be very capable but you need a good deal of NERVE when cutting the ferrous stuff!!  I need to find out whether the blades are re-sharpenable.
Niloch17/11/2009 21:22:35
371 forum posts
Posted by Jim K on 17/11/2009 12:44:13:
Hi does anyone know where Dragon Saws has gone
JimK

 Dragon saws were highly thought of.  Use the search facility here to find out more about their fate.

Billy Mills17/11/2009 21:34:17
377 forum posts
Hi All,
 
Have had the same kind of fun with the imported metal cutting bandsaws, it's reassuring that others have problems too!. We have one at work which has cut tons of MS, it certainly works best with bimetal blades. After ten years the driven wheel has developed a rounded edge so the blade does slip off- time for a new one!
 
Be careful with the guides, the two ball races each side of the cutting region have to twist the blade to the vertical so they need a larger gap than you might think, the race positioning is via eccentric mounting bolts. If the races are too tight the blade will heat up and can jam then subsequently have a twisted backing. Badly worn bearings, too heavy down pressure, blunt blades and swarf can also cause jams. (This can also jam a conventional bandsaw and twist the blade back).  One sign of twisted blades is a new clonking sound  when the machine runs. Badly distorted blades then slip off the drive wheel.
 
When you get the saw it will normally cut  vertically downwards however if it is Wednesday or you have changed the blade or fiddled with the races you will probably get a slanting cut showing that the twist is escaping past the races.
 
We use a scrap of   2x2  wood and try to get the blade cutting vertically  at each side of the cut. It really is a matter of relaxing and making small adjustments until you hit the sweet spot. You can try using a straight edge held against the blade and adjusting for vertical with a stationary blade to get into the ball park then fine tune with the blade actually cutting.( Adjustments with the saw OFF please!).
 
Taking off the tension is a kindness to the rubber tyres that are fitted to the drive and idler wheels on good bandsaws, If you don't take the tension off then there is a risk of flats forming on the tyres. Some very nice machines have an over centre roller and lever so that you can "Knock off" the tension on the blade when you are finished.
 
Regards Alan.
 
 
 

 
 

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