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HOW TO USE LONG TYPE DRILLS y 2. Initial cutting with the long type drill
a Drilling a blind hole
y 1. Drilling a pilot hole
zUse a drill with a larger (flatter) point angle than the super long type. zPenetrate the pilot hole at low revolution. (Cutting speed
Mitsubishi type MNS, MAE-MB or MAS-MB is recommended. 20 30m/min, feed rate 0.20.3mm/rev)
xUse a drill with the same diameter as the deep hole drill. xStop the long type drill 1 3mm short of the pilot hole bottom.
cDrill depth : Approx 2 3D or deeper.
(Adjust the pilot hole depth according to the length of the super long type.)
y 3. Drill the deep hole y 4. Drill retraction
zStart cutting at the recommended speed and feed with a non-peck zAfter drilling, lower the cutting revolution about 12mm short of the hole
(continuous feed) cycle. end. (Cutting speed of around 2030m/min)
a Drilling and breaking through on irregular faces or angles xRetract the drill to the pilot hole depth starting point at a feed rate of
3000mm/min.
y 1. Spot facing
cFinally, clear the hole at a cutting speed of 20 30m/min and feed rate
of 0.2 0.3mm/rev.
y 2. Drilling a pilot hole
zMachine a flat or the irregular face by using an end mill or slot drill zUse a drill with a larger (flatter) point angle than the super long type. DRILLING MNS DRILLS
capable of spot facing. Make the spot face diameter the same size as Mitsubishi type MNS, MAE-MB or MAS-MB is recommended.
the required deep hole diameter.
xUse a drill with the same diameter as the deep hole drill.
cDrill depth : Approx 2 3D or deeper.
(Adjust the pilot hole depth according to the length of the super long type.)
y 3. Initial cutting with the long type drill y 4. Drill the deep hole HOW TO
USE
zPenetrate the pilot hole at a low revolution. (Cutting speed zStart cutting at the recommended speed and feed with a non-peck
20 30m/min, feed rate 0.2 0.3mm/rev) (continuous feed) cycle.
xStop the long type drill 1 3mm short of the pilot hole bottom. y 6. Drill retraction
y 5. Breaking through
zWhen breaking through, the cutting edge can be damaged. zRetract the drill to the pilot hole depth starting point at a feed rate of
xA feed rate of 0.05 0.1mm/rev is recommended. 3000mm/min.
xFinally clear the hole at a cutting speed of 2030m/min and feed rate of
0.2 0.3mm/rev.
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