Общий каталог Yamawa 2022 - 2023 - страница 725

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Drill Overall Shank Thread + Neck

■Removable taps and machining conditions

Cutting Edge Dia.Removable TapRevolution SpeedFeed SpeedG73 St
Dc （mm）SPPOHT（min -1）（mm/min）eps （mm）
6.0M8・M10M8M10550 ～650
7.0M10・M12M10M12450 ～5502 ～40.2 ～0.4
8.5M12・M14・M16M12M12・M14400 ～500

* This is most suitable for the removal of spiral fluted taps (with helix angle of 35° or more). Please see “Machining case 1” <for spiral fluted taps> on the pre-page.

■Removal procedure

1 2

Flatten with

grinder!

3

More fragments

for spiral pointed

taps or hand taps

A tap is broken. Before starting removal, Supplying enough water-soluble cutting oil, flatten the broken part of the tap with a perform machining carefully in steps of G73.

Select a cutting edge diameter suitable

grinder or the like as far as possible.

for the removable tap, firmly attach the

For G73, please see "Notes" on the next page.

tool and workpiece to MC, and set the

Remarks: If any tap fragments come out with unusual sound removing tool to the center of the broken during machining, stop work and remove the

Remarks: Machining with the part left broken willtap.fragments with a scriber or the like. For PO and
cause the removal tool to become chipped.HT in particular, proceeding with machining by
force will cause the removing tool to be broken by
the fragments caught in it.
456

Crack on far side

You will hear unusual sound when the removing toolWhen machining is finished, removeThe procedure i s c o m p l e t e . I f
A tap is broken. Before starting removal,goes through the tap. Stop feeding it. A crack isthe remainder of the tap with a scribernecessary, deburr the internal thread
flatten the broken part of the tap with afound on the far side of the hole, where the tap isor the like.again with a tap.

grinder or the like as far as possible. cut off. Proceeding with machining by force will cause the tool to be broken by the fragments caught in it. Move the removal tool to a safe place, and remove the fragments with a chisel and a punch.

*To eject sludge during machining, water-soluble cutting oil is recommended.

You can also see it from

the video site on the left. ⑦-80