THREADING SYSTEMS - JEL - 05/2008 - Komet
THREADING SYSTEMS - JEL - 05/2008 - Komet
THREADING SYSTEMS - JEL - 05/2008 - Komet
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Setting (drill) thread milling tools<br />
Preparations on tool<br />
Tool clamping<br />
• Correct alignment of clamping screw on clamping surface<br />
for Whistle-Notch adaptor<br />
• Minimise overhang but the cutting sweep for the tool<br />
should be beyond the adaptor<br />
Effect of concentricity on tool life using<br />
a solid carbide thread milling tool as an<br />
example<br />
Lf (%)<br />
thermal expansion or hydr. expansion chuck<br />
<br />
<br />
<br />
<br />
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<br />
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<br />
Material:<br />
heat treated steel<br />
Rm = 1000 N/mm 2<br />
HE cyl. with side screw<br />
collet<br />
<br />
run-out error (µm)<br />
<br />
<br />
<br />
Cutting values:<br />
Size: M10<br />
v c<br />
= 100 m/min<br />
f z<br />
= 0,06 mm/tooth<br />
Milling method for different materials<br />
Cast aluminium<br />
• Can be carried out without a peck cycle<br />
• For tools with internal coolant there is no need for chip<br />
clearance after boring.<br />
Long chipping aluminium<br />
• At least one peck cycle<br />
• Radial division of cut may be necessary if a thread with<br />
very low burring is required<br />
Grey cast iron<br />
• No chip clearance<br />
• Conventional thread milling in one path . Over 2×D two<br />
paths may be required.<br />
Special cases<br />
Through hole<br />
• For tool with internal coolant, switch to external coolant<br />
for milling<br />
• To reduce side load, preferably work with milling section on<br />
shank side<br />
OK<br />
Tool measurement<br />
• Only measure tool length on pre-setter.<br />
• Check concentricity at drill tip resp. thread milling section<br />
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