The following are some ‘Rules-of-Thumb’ that are industry proven and will guarantee longer Blade life.
Running-in Procedure (also called Break-in Procedure)
- For the first 15 minutes of a new blade being fitted to the machine, maintain normal blade speed & reduce the down feed. The blade should effectively rub the material to be cut & only produce swarf as 'filings'.
- This is best achieved by cutting a solid piece of mild steel with half the normal downfeed pressure. The process creates a honing effect to the tips of the teeth where they are microscopically dulled.
- After 15 minutes of ‘running in’ The downfeed rate can be increased to a normal rate & cutting can proceed.
Blade speed (Optimum)
Mild steel: 70 – 80 metres/minute
Stainless steel: 45 – 55 metres/minute
Governing the correct downfeed rate: You can tell this by looking at the Swarf, what you want is ‘fingernail’ type swarf curls that only do 1 to 1.5 curls (max), and aren’t blue/darkened with heat. (NB. You will get a bit of a range of swarf sizes, but you will see it when the main of the swarf curls are like this.)
Blade Tension: This is critical for accuracy in cutting and for maximum Blade life. To manually check for sufficient tension, ensure the Machine is turned off and place the palm of the hand on the back of the Blade, in between the Blade Guides. By pressing down towards the bed of the Machine, there should be nothing more than 1-2mm of movement.