Threading video

[.RC.]

I have made a short threading video for those unsure of how to do it....There are no doubt many ways to do but this is a brief description of how I do it...I have had lots of success doing it this way...This is only a basic guide, for things like depth of cut and major/minor diameters etc etc I suggest you read up the relevent text books...

Nearly 6Mb for the bandwidth challenged...


http://www.putfile.com/media.php?n=Threading



[This message has been edited by Ringer (edited 07-01-2005).]

[.RC.]

Some feed back would be appreciated also on on what you think of it...good or bad I have a thick skin..

[Your Old Dog]

No need for thick skin! Good job. I don't have any others to compare it with because to my knowledge no one else has offered one up. Thanks for your efforts!

Ray.

[QSIMDO]

Thank you indeed!
Most informative and rather like rubbing your head and patting your stomach at the same time...or is it...

[Smokedaddy]

Dude,

As a novice, I sure appreciate things like this. I'd say you did a super job! It would of been nice to show them HOW to set the tool square to the workpiece (with a fishtale ... or whatever it's called).

Thanks,
-SD:

[Smokedaddy]

Oh ... BTW,

Would love to see a video on conventional milling compared to climb milling, using a Brideport (or any vertical type mill). Still don't totally understand it and I've read a ton of books. Just haven't found anything that I understand.

Why does my Bridgeport have a forward and reverse spindle (clockwise/counterclockwise)? For example, so I can do conventional and/or climb mill (if I understood exactly the difference) if I'm trying to mill a slot all the way around the inside of a square block?

-SD:

[claw]

Is that the correct speed? I thought there have been other posts on here stating the speed needs to be real slow. Around 70 RMP. Am I wrong?

[.RC.]

I was using 770rpm....It was a carbide insert tool so cutting speeds need to be high...That speed can only be used when you are confident at threading as in the coarser pitches it tends to move along the workpiece rather fast..

[John Stevenson]

Ringer,
Had a look at the video and nice work.
The only comment I'd like to make is because it's aimed at beginners you might be better running at a beginners speed with HSS tools.
770 revs seem frightening to someone who is a novice.

SD,
I think you may be confused by the term climb miling and conventional milling with regards to spindle direction.

Bridgeports have forward and reverse because when you are in backgear the drive is reversed and you need to reverse the motor to keep a clockwise rotation on the spindle.

Conventional milling is when you are driving the cutter forwards into the work and cutting on the left hand side of the cutter looking from the top.
The cutting action is to cut a sliver of metal whilst it's driven into the cutter.

Climb milling is as above but done on the right hand side of the cutter.
The cutting action in this case is to use the rotation of the cutter to assist in the removal of the chip.

As usual advantages and disadvantages.
Advantage of climb milling is better surface finish, faster stock removal and less power.

Disadvantage is if you have any backlash in the screws it can grab the cutter, pull it into the work and break it.
Climb milling is the de-facto method on CNC mills with zero backlash ballscrews but it depends on machine condition whether it's used for bulk cutting on a manual machine, it's ideal for a light finishing cut though.

To use your example of an inside square, if you go round the square clockwise you are conventional milling all the way as you are only cutting on the left of the cutter going forwards.
Anti clock round the square is climb milling.

HTH.

John S.

[This message has been edited by John Stevenson (edited 07-02-2005).]

[Alan in Oz]

Ringer,
Good show mate, nice blueing chips on the saddle too, spot on.

[aboard_epsilon]

Good try and I aplaud you for your efforts.
now if i was completely new to threading.....and if i tried to follow what you were doing there........I would make a terrible mess of the threading.
because ..
you dont say.
if you are following/looking at a thread dial indicator .
or is it that your lathe is set up to cut threads no matter where you enguaged and be in sinc.
hope you see the resoning behind what I've just said.
all the best..mark

[aboard_epsilon]

Hey John S.....
I'm new to horizontal milling...
does climb milling effect a horizontal mill as much as a vertical mill.
all the best...mark

[Your Old Dog]

Here's some more feedback!

How about doing one on the tapping devices used in your drill press? I'd love to see someone tap say a 3/8 or 1/2 inch hole. There's currently a thread on the subject.

Epsilon makes a good point. I'm a rookie, but a rookie with a thread gauge so I figured you were waiting for the thread gauge to come around to it's mark. I suppose if my lathe didn't have a thread gauge I wouldn't know to look for that. I particularly liked the lack of paid commercial interruptions

I have a video on how to build a Liquor Cabinet but can't figure out the ftp stuff to it up on my website.



[This message has been edited by Your Old Dog (edited 07-02-2005).]

[.RC.]

Thanks for the feedback,

Yes I was waiting for the thread chasing dial to come around to the same position each time..My lathe only has a metal sticker for the top of the dial and it is near illegable and I am yet to make a new top for it so can engage it normally at each mark for even threads and any numbered line for odd threads(my lathe has a 1/4 inch leadscrew)

I know I didn't show lots of necessary things about threading, these were omitited for a few reasons.
1. I only had 10Mb max file size limit..The original 2 min clip in clear .avi format is 600Mb in size.

2. Most of the technical info that you need to know can be gleaned from text books and on web sites.

3. It was mainly made to show how to set up and cut the thread after you have the tool correctly installed and know what depth of cut you want and know how to use the thread chasing dial etc etc...

I understand most people don't thread at these speeds but with carbide it usually doesn't like slow cutting speeds...I implore people to use the speed they feel comfortable with and that the cutting tool can handle..


and oh yea I don't have a tapping attachment so won't be able to make a vid of one in use...But of coarse someone kind could send one to me and I will see what I can do..

[This message has been edited by Ringer (edited 07-02-2005).]

[IOWOLF]

Why didn't I see any cutting oil/fluid applied, did you use it?