絲攻:機用? 手用? 分別在那

本帖最後由 dino_lo 於 2016-4-27 10:58 編輯

工業中學年代, 上堂, #1,#2, #3 咁用,
上縲絲咁上, 兩三吓(約一圏)就會企定,加機油,再上兩三吓,倒後上一吓,清吓攻牙出來的屑, 才再兩三吓, 倒一吓.一路過攻牙,到半支絲攻的長度才,換第二支, 再用第三支.

我自己用, 手攻M3絲攻, 8MM的膠板,5MM的鋁片都係用到直用#2就算,
有了手電批,用慢速,,加油(WD-40)轉一吓,倒一吓 ,清一清碎屑,都係只用支#2.
近期又想買一M3,~M8, 1/8~1/4, #6/32,美制HDD),

如果只用#2, 上縲絲就係小小緊,.#3就可好,順滑.
如果買機用的絲攻.是否不用做清碎屑的,一鑽到尾.出來的的牙是順滑的?

本帖最後由 高登阿伯 於 2016-4-29 02:30 編輯
工業中學年代, 上堂, #1,#2, #3 咁用,
上縲絲咁上, 兩三吓(約一圏)就會企定,加機油,再上兩三吓,倒後上一吓 ...
dino_lo 發表於 2016-4-27 10:49


手攻三枝係唔同尺寸,由細到大,要逐枝攻一次個絲孔尺寸至正確,即係你講嘅牙是順滑。分三枝原因係太大力斷攻仲麻煩,逐枝攻可以減少用力。

機用絲攻係一枝過一攻到尾,但用手攻一様要清鐵屑,因為手動係行行停停,唔會好似用機咁易一下到尾所以唔做清屑。 其實機攻都要清屑,特別係生鐡一類出屑成碎塊狀嘅物料。


想唔做清碎屑,嗰種叫擠壓絲攻。

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攻牙用3支係攻盲窿時先須要, 通窿係用一支就夠.

p.s.:我都係讀工業中學, 當時係全港最大果間.

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我見同事是用電批,一次過高速攻到支絲攻底,就出返嚟。攻3mm鐵板。
佢哋用#3

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要看是什麼料同厚薄。

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https://en.wikipedia.org/wiki/Tap_and_die

這裡解釋得不錯。

A tap cuts a thread on the inside surface of a hole, creating a female surface which functions like a nut. The three taps in the image illustrate the basic types commonly used by most machinists:

Bottoming tap or plug tap[2]
The tap illustrated in the top of the image has a continuous cutting edge with almost no taper — between 1 and 1.5 threads of taper is typical.[3] This feature enables a bottoming tap to cut threads to the bottom of a blind hole. A bottoming tap is usually used to cut threads in a hole that has already been partially threaded using one of the more tapered types of tap; the tapered end ("tap chamfer") of a bottoming tap is too short to successfully start into an unthreaded hole. In the US, they are commonly known as bottoming taps, but in Australia and Britain they are also known as plug taps.

Intermediate tap, second tap,[2] or plug tap[4]
The tap illustrated in the middle of the image has tapered cutting edges, which assist in aligning and starting the tap into an untapped hole. The number of tapered threads typically ranges from 3 to 5.[3] Plug taps are the most commonly used type of tap.[citation needed] In the US, they are commonly known as plug taps, whereas in Australia and Britain they are commonly known as second taps.

Taper tap
The small tap illustrated at the bottom of the image is similar to an intermediate tap but has a more pronounced taper to the cutting edges. This feature gives the taper tap a very gradual cutting action that is less aggressive than that of the plug tap. The number of tapered threads typically ranges from 8 to 10.[3] A taper tap is most often used when the material to be tapped is difficult to work (e.g., alloy steel) or the tap is of a very small diameter and thus prone to breakage.


The above illustrated taps are generally referred to as hand taps, since they are, by design, intended to be manually operated. During operation, it is necessary with a hand tap to periodically reverse rotation to break the chip (also known as swarf) formed during the cutting process, thus preventing an effect called "crowding" that may cause breakage.

The most common type of power driven tap is the "spiral point" plug tap, whose cutting edges are angularly displaced relative to the tap centerline. This feature causes the tap to continuously break the chip and eject it forward into the hole, preventing crowding. Spiral point taps are usually used in holes that go all the way through the material, so that the chips can escape. Another version of the spiral point plug tap is the spiral flute tap, whose flutes resemble those of a twist drill. Spiral flute taps are widely used in high speed, automatic tapping operations due to their ability to work well in blind holes.

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如果機床攻牙,我見係唔使回刀,一刀踩到尾,但电批可能唔夠力,如果真係要攻好多牙而且係鐵料,我建議鑽大少少個窿,易攻好多!

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本帖最後由 xiao 於 2016-5-1 00:13 編輯

回覆 1# dino_lo


手攻一般直坑, 碎屑一般下落, 頭攻定位校正垂直度, 配合曲尺用, 二攻每齒的切削負荷最小, 最省力, 三攻最後通常攻盲孔底端

機攻螺旋坑上推碎屑, 自動排出, 一支到底, 垂直度由機床Z軸提供, 不需要修正

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攻牙用3支係攻盲窿時先須要, 通窿係用一支就夠.

p.s.:我都係讀工業中學, 當時係全港最大果間. ...
jwong852 發表於 2016-4-27 18:38


講吓笑 :
唔係計全港最大果間. ...,
當年我讀而家的"理工大學"日校 Enginneering
視乎遇著边個亞Sir,和Workshop 導師有無料,有無心機教 !

等如呢度,有很多好 C Hing !!!!!!

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本帖最後由 jwong852 於 2016-5-3 17:45 編輯
講吓笑 :
唔係計全港最大果間. ...,
當年我讀而家的"理工大學"日校 Enginneering
視乎遇著边個亞Sir,和W ...
thomasfw 發表於 2016-5-3 15:09


Poly IC D 亞Sir, 邊有工業中學教得咁多呀.

所有ENG學生暑假都要入IC, 只係做下工埸野, 從不認真.
入IC果D學生, 如果唔係工業中學底, 九成做野姐手姐腳.
工業中學, 連揸把銼點扎馬都有教.


工業中學入足工埸五年, 由最基礎教起, 學好基本功夫先有用.
入IC只係俾機會你, 叫做掂過吓, 跟工業中學差幾皮 !

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