ARNO - каталог сверление 2011
для размещения заказа - info@arno-tools.ru
General recommendations for drilling
Trouble shooting in drilling
Occurrence of trouble
Drill will not enter workpiece
Margin chipping
Cutting lip breaks
Tang breaks
Drill breaks in brass
Chipping of drill center
Hole oversize
Outer corners break down.
Large chip of one flute and small
chip of other flute
Cause of trouble
1. Drill is dull.
2. Lip relief too small.
3. Too thick a web.
1. Oversized bush.
1. Lip relief too much.
2. Feed too heavy.
1. Imperfect fit between taper shank and socket.
2. Burred or Badly worn sockets.
1. Unsuitable drill
2. Flutes clogged with chips
1. Lip relief too much.
2. Feed too heavy.
1. Unequal angle or length of edges.
2. Loosen spindle.
1. Cutting speed too high.
2. Hard spots in work material.
3. Flutes clogged with chips.
4. Drill is too worn.
1. Improperly ground point.
2. Only one lip doing all the cutting
Hole rough
1. Improperly ground point.
2. Unenough coolant supply
3. Too much feed.
4. Fixture not rigid.
Countermeasures
1. Grind lip relief sufficiently.
2. Grind web thinning.
3. Choose a drill with narrow web.
1. Choose the suitable bush for drill diameter
1. Grind lip relief sufficiently.
2. Decrease feed rate.
1. Clean the dirt or chips in sockets.
2. Change the worn sockets to new ones.
1. Choose the suitable drill for work material.
1. Grind lip relief sufficiently.
2. Decrease feed rate.
1. Resharpening point, choose correct drills.
2. Tighten spindle sufficiently.
1. Grind point to suit work material.
2. Decrease the feed rates.
3. Resharpening early beforce too worn.
1. Properly grind point.
2. Grind point with same point angle and length of lip
1. Properly grind point.
2. Supply coolant enoughly.
3. Decrease the feed rate.
4. Tighten the fixture or replace.
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info@arno-tools.ru
www.arno-tools.ru
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