Re: Modeling Machine Screws

On Sun, 15 Apr 2007 10:25:24 -0700, brewertr@xxxxxxx wrote:

Cliff,

I see your still cyberstalking me because

You posted some sily stuff again?

you posted two lines of
G-Code in alt.machines.cnc where I keep pointing out your five
mistakes in those two lines of code.

One tired typo ... unlike your turning of negative diameters & a
multitude of nearly worst practices.
Bet your machine "operators" are always adjusting, fudging & editing code.

Unlike you I also know a little about threading since I began my
machining carrier nearly 30 years ago in an aerospace fitting and
fastener threading job shop. I went on to manage that same shop and
eventually owned one as well.

I hope I'm not flying in planes with your "parts" I think.

In nearly 30 years of machining I have had ONE valid customer
rejection, it was an order where we used customer supplied gauges.

So you "inspect to guage" .... that can be wrong too.
BTW, In the US "gage" is often used. Even though such
are plums (a litte birdie told me <G>).

Unlike you I have actually inspected threads, ground my own threading
inserts and used them so I know a little about how they are made and
work.

DANGER, WIL ROBINSON !!!

On Sun, 15 Apr 2007 03:59:16 -0400, Cliff <Clhuprich@xxxxxxx> wrote:

All cut thread tools are made with the thread form being ground (made)
perpendicular to the thread axis exactly as they are specified in
machinery handbook* and other standards* and has a relief ground on
the sides to clear the helix angle.

http://www.mmsonline.com/articles/010302.html

Note the tilted insert ...

As I stated above the tilted insert shown in figure 5 is ground
perpendicular to the thread axis.

If the thread's axis went left to right your "perpendicular" would be
up & down or similar.

"Perpendicular" means "at a right angle". HTH.

1 axis + 1 axis + 1 axis +1 axis + 1 axis = (1 + 1 + 1 +1 + 1) axis =
5 axis you say?
Just like 1 apple + 1 apple = 2 apple?

No tilted inserts in any of the other 11 pictures/drawings all of
those views are perpendicular to the axis.

A picture = 1,000 words, eh?

Cliff, here bonus questions for you;

http://www.mmsonline.com/articles/010302.html

Do you know why that tilted insert as shown in fig 5 drawing can
only be a single point threading inserts? (Can't be used on multiple
tooth inserts.)

Depends on how things are made.

Do you know why that tilted insert as shown in fig 5 drawing is
used for larger diameter (normally course) threads and not on small
diameter ones?

Tom

You need to consider first & second derivatives <G>.

HTH
--
Cliff
.

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