37
V125T/July 2020/V1.1
6.4
Twist drills
This magnetic drilling machine can be used with twist drills of the following types.
1)
HMT
VERSADRIVE
shank drills
–
using the
VERSADRIVE
Rapid Lock Weldon Adaptor.
2)
HMT Weldon shank drills
–
fitted directly into the Weldon arbor.
3)
Morse taper shank drills up to MT3
–
27mm
–
Weldon arbor removed.
4)
Plain shank drills used in 3 jaw drill chuck
–
MT3 drill chuck replaces Weldon arbor.
The Weldon arbor or taper shank drill can be removed by using the drill drift supplied.
6.5
Tapping
A range of HMT tapping accessories are available, please see the website or online catalogue for the
full list.
It is advisable to use the Weldon Shank
VERSADRIVE
Clutched Chuck for tapping of blind holes.
When tapping with a magnetic drill it is best to use either spiral flute or spiral point taps to ensure
the flutes stay clear of swarf. Swarf in the flutes creates excess drag and loads the motor.
To tap a through hole using a drill/cutter and tap.
1)
Drill the through hole as normal to the tapping diameter for the thread to be cut.
DO NOT switch off the magnet or move the drill.
2)
Fit the tap directly into the machine of via a tap holder and apply cutting compound or spray
lubrication to both tap and workpiece.
3)
Set the tapping speed, maximum torque is required for tapping so use the gear change to
slow the spindle and maintain the electronic speed control to a high setting where possible.
4)
Ensure the direction switch is in the forward direction and START the spindle.
5)
Lower the tap with the feed handle, when it comes into contact with the workpiece it will
begin to feed through on its own due to the pitch of the tap.
6)
When the lead of the tap has cleared the thickness of the plate STOP the spindle.
7)
Whilst the spindle is STOPPED switch over the direction switch to reverse.
8)
START the drill in reverse, the tap will begin to feed out of the hole.
TAKE CARE to anticipate the feed handles rotating as the tap reverses out of the hole.
9)
Once the tap has left the hole the drill unit can be raised and the spindle STOPPED.
