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Milwaukee 4270-20 User Manual

Page 9

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page 9

9. These units have a 8:1 feed ratio: i.e. for every pound applied to the

handle, you create eight pounds on the drill point. Even large bits only

require a small amount of pressure on the handle. Example: 20 Pounds

on the handle creates 160 Pounds on the drill point.
When feeding the cutter into the material, apply only enough force to

produce a curled chip. Applying too little force will result in small bro-

ken chips and increased cutting time. Applying too much force will

cause overheating of the cutter resulting in short cutter life. Overheat-

ing of the cutter can be noticed when cutter and chips turn brown or

blue. Excessive force can cause the cutter to slow down to a point

where cutting time will increase. The use of cutting lubricants will

reduce cutting heat and increase cutter life
Use less feed pressure when slotting or notching because there is

less support for the cutting edges in these situations.

Fig. 9

To reduce the risk of injury, always keep hands, rags, clothing,

etc. away from moving parts and chips. Do not try to remove

chips while the cutter is rotating. Chips are sharp and can pull

objects into moving parts (see Fig. 9).

WARNING!

8. Start the drill motor by pulling the drill on/off switch to the "ON" position.

10. Keep constant pressure throughout the entire operation to

prevent chips and burrs from falling under the cutting edges.

Cutting debris under the cutter can make cutting difficult or

impossible.

11. When the cut is complete, withdraw the cutter while the drill spindle

is still rotating.

12. Stop the drill motor by pushing in the drill on/off switch to the "OFF"

position.

13. When the drill spindle has stopped rotating, use a pliers to remove

cutting debris and chips from the cutter and spindle. Use care to

avoid damaging the cutter teeth.

14. If the slug is still present in the cutter, rotate the feed handle to

highest position. This will eject the slug from the cutter.
The center pin is spring loaded. Provide protection from ejected

slug for people and property below cutting area.

15. Make sure you have a firm grip on the tool before turning off the

magnet.
Push the magnet switch to the "OFF" position. The magnet

indicator light will turn off.

Excessive force will break magnet free.

WARNING!