Chop saw

[Drains]

i got a fine tooth blade will this be any good for cutting 40 x 40 box by 2.5 mm what sorts of speeds should i be cutting at.???

The blade speed should normally be slowed for harder materials. M/S should be fine at the highest speed. Tool steel will be at the lowest.

Feed speeds should be slowed for stainless steel, and for thin section (like the vertical bit of box), to avoid strain on individual teeth (in the latter case).

TPI is mostly affected by material size, so the thinner the section the more TPI required. However the main reason for haveing a coarser blade on thick section is that as the point loads on the teeth reduce, the saw cuts slower, so the job takes longer.

To be on the safe side, use a fine TPI, but be prepared to hang about if you're cutting thick stock.

If you're breaking blades then there is almost certainly another problem (like a misalignment of blade/ guides/ wheels, or the blade is wrongly tensioned. It's normally teeth that break under overloading, or go blunt through running too fast on hard materials. I've only ever seen horizontal bandsaw blades break, mostly through utter abuse!

 

[nickk]

another problem with using fine blades on wide material is that the teeth clog & then it jams & breaks teeth ,this is accentuated by the swarf in the cut,coolant helps wash the cut free of swarf.

 

[astro_al]

They can also jam and break if batch cutting and one piece isn't clamped firmly like the others.

Al.

 

[Hitch]

Try a varipitch blade, that's all we use in the ones we have. Cutting from about 2mm wall box upto large beams, solids etc.

When you cut thick flats, have you tried doing it on edge? Takes a little longer, but much less strain on the blade.


Other thing, check the bearings on the wheels, and the back of the guides. Since I changed both sets on our big saw the blades have been lasting much longer.