cut an internal thread

Gallery, Projects and General > How do I??

(1/3) > >>

j45on:
I am trying to make a light for my push bike I use for work and I need to cut an internal thread in the end of a now shortened maglite 3D body.
Trouble is I have never machine cut a thread before :hammer: the closest I have come is watching a mini lathe video where the guy shows you how
to cut a thread without a threading dial.
The only bit i'm unsure about is where to position the compound I know the angle has to be 29.5 am I correct in guessing the compound has to come in from the rear ?

This used to be a scruffy corroded maglite
I bought the led's and lens last winter after seeing this thread http://www.thehubsa.co.za/forum/topic/23048-diy-cree-led-bike-light/ but never got around to building anything ::)

atwatterkent:
To cut an internal RH thread, I rotate the compound so that the dial end faces the back of the bed, 12 o'clock, then rotate it 29 1/2 deg clockwise. You can then use the same compound infeed amount as if you were cutting an external thd. Good luck, Bob

mardtrp:
:lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol:

--- Quote from: atwatterkent on October 09, 2010, 06:20:28 PM ---To cut an internal RH thread, I rotate the compound so that the dial end faces the back of the bed, 12 o'clock, then rotate it 29 1/2 deg clockwise. You can then use the same compound infeed amount as if you were cutting an external thd. Good luck, Bob

--- End quote ---

But why move it AT ALL?

You can cut it just as easily with the compound left alone, why confuse yourself by moving the compound, it just adds confusion and does not help at all.

j45on, if you have never cut ANY thread before, then may I suggest you try cutting an EXTERNAL thread first, get it so you know what's going on, then try for the internal thread.

Just leave the compound alone and cut straight in, it works without all this black-magic art that others will try and shove onto you. OK, OK, so the book says to do it this way, well, when was the bloody book written and maybe the tooling has improved slightly since then too.

For those that are going to say you have to move the compound around, then please send an email to Sir John, Earl of Suds-Pump-Water and tell him he's been doing it ALL wrong for many many years, just sit back and see what sort of a response you'll receive.

Mark

No1_sonuk:
I use the angled compound infeed, BUT I use it on THE SAME SIDE as for external threads (29.5 degrees anti-clockwise from 90).
Just put the tool in upside down, contacting the BACK of the hole, and infeed in the same way as for external threads.

atwatterkent:
I don't care to be drawn into an arguement about the better of two methods for threading that I am familiar with. I have never used the third method suggested and have no opinion about it. Both standard methods work and the direct infeed method is easier. I have used both and taught both methods and found that the offset compound method, although a bit more tedious, gives a better finish in my humble opinion, so that is the method I recommend.
Learning to thread externally first is a very good suggestion and I would urge anyone who is unfamiliar with threading operations to master that first. Bob

Navigation

 Message Index

Go to full version