Общий каталог Mitsubishi 2020 - 2021

THREADING METHODS

Right Hand Thread Left Hand Thread

Usually, threads are cut feeding the insert towards the chuck.
When machining left hand threads, note that clamping rigidity is lowered due the application of back turning.
When machining left hand threads, the lead angle is negative. Ensure an appropriate lead angle by changing the shim.

Partial Form Full Form Semi Full Form (Trapezoidal threads only)

a The same insert can be used for a range of pitches.	a No deburring needed after threading.	a No de-burring needed after threading.
a Shorter tool life because the nose radius of the	a Requires specific insert for each thread	a Requires specific insert for each thread

	insert is smaller than that of a full form insert.	form and pitch.		form and pitch.
a Finishing with another operation may be necessary.			a Finishing with another operation may be necessary.

Crest Radius Crest Radius Crest Radius

(Additional turning necessary to finish the thread crest.)		(Finished by insert form.)		(Additional turning necessary to finish the thread crest.)
	Finished		Finished

Surface Surface Finished Surface

Finishing Pre-finished

Pre-finished Surface	Pre-finished Surface		Surface
		allowance

Feed Direction Insert Feed Direction Insert Feed Direction Insert

INFEED METHODS

1°─ 5°

Radial Infeed Flank Infeed Modified Flank Infeed Incremental Infeed

aEasiest to use. aRelatively easy to use. aPreventing flank wear on the aUniform wear of the right and

	(Standard program for		(Semi-standard program for		right side of the cutting edge.		left sides of the cutting edge.
	threading)		threading.)	aReduced cutting force.		aReduced cutting force.
aWide application. (Cutting		aReduced cutting force.		aGood for large pitch or		aGood for large pitch or
	conditions easy to change.)	aSuitable for large pitch			materials that peel easily.		materials that peel easily.
aUniform wear of the right and			threads or materials that	aGood chip discharge.
	left sides of the cutting edge.		peel easily.
		aGood chip discharge.
							P
aDifficult chip control.		aLarge flank wear of the right		aComplex machining		aComplex machining
aSubject to vibration in the later			side of a cutting edge.		programming.		programming.
	passes due to long cutting edge	aRelatively difficult to change		aDifficult to change cutting		aDifficult to change cutting
	in contact with work material.		cutting depth.		depth. (NC programming		depth. (Re-programming
aIneffective for large pitch			(Re-programming		necessary)		necessary)
	threading.		necessary)			aChip control is difficult.

aHeavy load on the nose radius.