I want to lay 17 hole diameter, valve hole of steering pump, recently the old material is out of order, gray cast iron, which has two cross the oil window, leaving 30 wire end hinge margin, to reach 17 by 5 wire with diamond reamer reaming finally reached 17+0.008mm, but sometimes twisted lax that is the total crude hinge traces, do not know why. Master, tell me why? How to choose the cutting amount, how high the speed, what choice to do cutting fluid? The speed of feed and retract? We use emulsion, right? Thank you
No matter how much you began to drill the hole, I suggest you use the whole hard alloy reamer cutter 16.75 to 16.8 or 3 edged blade (YG8 can), expanding a hole, and then reaming, i.e. unilateral stay 0.1~0.125 margin, S500~S800 F150~F240, thick hinge you see traces. I think it is too much allowance, resulting in poor chip galling, your diamond reamer containing slot cutting may be a bit small, you if you can 4~8 reamer blade consider S150F120 or S200F160, is a constant speed to return to double check, cutting fluid pressure, suggest that you try Mobil 232 try cutting fluid (1:20 ratio).
The reaming should not be done with vegetable oil or animal oil, oil or cutting fluid. With the drill hole cutter can not play automatically, because it will form a knife regularly, just like the same thread. Your thick left margin, 30 wire a little big, usually a maximum hinge 20 silk on quite a lot. Reaming general speed to low, dozens of turn, up to 100. High speed, large vibration, affecting smoothness. Take the knife a little faster than the knife at the hole. It is better to use manual feed, steady and uniform feed. Add more oil, usually with soybean oil or vegetable oil, buy those vegetables oil, you can, cheap or good. Feeding and retracting are not reversed, the last time after reaming machine can be stopped, and then brought this to the hole reamer, finish with minimal impact.
The margin stayed large. The fine hinge was pushed through the surface. The last one was left with 3 wires. Gray iron emulsion is good, 45 turn, stop the knife.
