Through such an approach you will damage the roller bearings, dramatically accelerate die and roller wear and reduce pellet quality. If you go and visit a professional large scale wood pellet manufacturing plant they will tell you that the die and rollers should never touch, there should be no metal to metal contact. However while these two components should never touch, that is not to say that the gap is irrelevant. You want to maintain a gap of 1mm to achieve the best balance of power consumption and pellet quality. If you set a gap above 1mm you will have issues with power consumption and potentially stall the motor. The greater the distance the more resistance, therefore above 1mm is only recommended for certain animal feeds and other low density materials.
The problem is, particularly on cheap pellet mill imports there is usually no method to set the distance of the die from the rollers. Therefore this usually means that you have to have metal to metal contact. Hence one of the reasons why it is practically impossible to produce quality pellets on small flat die pellet presses. On our Taichang high quality Mini Pellet Mill and small scale automated pellet plants we provide features to set the roller gap. We advise starting the die and then slowly adjusting the rolls to the die, as soon as you hear the contact just lift back slightly and then lock the rollers in position.