[Ignoramus3931]

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

[Ignoramus3931]

On 2013-03-22, Ignoramus3931 wrote:
My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

And here's the subroutine, released under GPL v3


(Makes a thread on a round part rotated in my fourth axis)
(Uses a 60 degree end mill)

Othread_on_fourth_axis sub
#x0 = #1 (X0, left side)
#x1 = #2 (X1, right side)
#y = #3 (Y, middle of the top edge of the round)
#z0 = #4 (Z, top of the edge of the round)
#safez = #5 (Safe Z for rapids)
#zstep = #6 (Z Step, positive)
#spr = #7 (Step Per Revolution, Also determines Total Depth)
#depth = #8 (Depth of thread, positive, determined automatically if 0 based on 60 degree thread.)
#diameter = #9 (Diameter of the round, needed for calculations of feed rate)
#frate = #10 (feed rate based on surface speed)
#left_handed = #11 (Set to 1 if left handed)

#rpm = [#frate/3.1415/#diameter]
#horizontal_feedrate = [#rpm*#spr]
#vertical_feedrate = [#frate/5]
#total_angle = [ 360 * [#x1-#x0]/#spr ]

(Set negative total angle if left handed thread)
Oif if [#left_handed NE 0]
#total_angle = [-#total_angle]
Oif endif

Oif if [#depth EQ 0]
;#depth = [#spr*1.73205/2] (depth = spr * sqrt 3 / 2 )

; http://upload.wikimedia.org/wikipedi...-p21--v001.png
#depth = [#spr*0.64952] (depth = spr * sqrt 3 / 2 )
Oif endif

Owithdraw call [#safez]
G0 A0 (go to 0 degree)

G0 X[#x0] Y[#y] Z[#safez]

( Start drilling down to Z0, I could rapid, )
( but slow is safer, will not break end mill )
G1 Z[#z0] F[#vertical_feedrate]

#direction = 1 (1 is right, 2 is left)

#z = #z0

Oloop while [ 1 ]
#z = [#z - #zstep]
Oif if [#z LT [#z0 - #depth] ]
#z = [#z0 - #depth]
Oif endif

G1 Z[#z] F[#vertical_feedrate]

(Depending on direction, we go to X1 on the right and turn total_angle,)
(or go to X0 on the left and go back to ZERO angle)

Oif if [#direction EQ 1 ]
#direction = 0
G1 X[#x1] A[#total_angle] F[#horizontal_feedrate]
Oif else
#direction = 1
G1 X[#x0] A0 F[#horizontal_feedrate]
Oif endif

Oif if [ #z LE [#z0 - #depth] ]
Oloop break
Oif endif


Oloop endwhile

Owithdraw call [#safez]
G0 X[#x1]

G0 A0 (go to 0 degree)

Othread_on_fourth_axis endsub

M2

[Martin Eastburn]

Nice - to bad you can't use a hob ? I think that what thread cutters
are or Cob... They have cutters a foot long and 6" in diameter -
coated and all - here in Lufkin - the foundry at Lufkin Industries has
to do it all. Massive gears and massive bolts and nuts.

The traditional donkey that pumps out oil is twice as long as those made
by Lufkin. Their custom way saves space and when in buildings (hiding
the pump) it becomes important.

Martin

On 3/21/2013 7:45 PM, Ignoramus3931 wrote:
My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

[Ignoramus3931]

On 2013-03-22, Martin Eastburn wrote:
Nice - to bad you can't use a hob ? I think that what thread cutters
are or Cob... They have cutters a foot long and 6" in diameter -
coated and all - here in Lufkin - the foundry at Lufkin Industries has
to do it all. Massive gears and massive bolts and nuts.

Yes, to do it properly, I would need to orient the rotary table at
angle to axis X. Too difficult for me to do it. I will mess with
making threads to see how geometry affects fit and how I can
compensate by fudging the diameter.

i

The traditional donkey that pumps out oil is twice as long as those made
by Lufkin. Their custom way saves space and when in buildings (hiding
the pump) it becomes important.

Martin

On 3/21/2013 7:45 PM, Ignoramus3931 wrote:
My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

[Pete C.]

Ignoramus3931 wrote:

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

Nice, but haven't you found a thread mill for $1 yet?

[jon_banquer[_2_]]

On Mar 21, 6:49*pm, "Pete C." wrote:
Ignoramus3931 wrote:

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

Nice, but haven't you found a thread mill for $1 yet?

iggy offered the person selling the $1 thread mill ten cents.

[Ignoramus3931]

On 2013-03-22, Pete C. wrote:

Ignoramus3931 wrote:

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

Nice, but haven't you found a thread mill for $1 yet?

I have not! But I should start looking.

i

[Karl Townsend]

On Thu, 21 Mar 2013 21:31:19 -0500, Ignoramus3931
wrote:

On 2013-03-22, Pete C. wrote:

Ignoramus3931 wrote:

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

Nice, but haven't you found a thread mill for $1 yet?

I have not! But I should start looking.

i

twice now, the auctioneer has called them taps. Makes for a really
good deal, I got one lot of 30 "taps" for $100. Even overheard one guy
saying that guy was crazy bidding $100 on taps.

Karl

[Pete C.]

Karl Townsend wrote:

On Thu, 21 Mar 2013 21:31:19 -0500, Ignoramus3931
wrote:

On 2013-03-22, Pete C. wrote:

Ignoramus3931 wrote:

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

Nice, but haven't you found a thread mill for $1 yet?

I have not! But I should start looking.

i

twice now, the auctioneer has called them taps. Makes for a really
good deal, I got one lot of 30 "taps" for $100. Even overheard one guy
saying that guy was crazy bidding $100 on taps.

Karl

So you have some extras to sell?

[Karl Townsend]

So you have some extras to sell?
Unlike iggy, I'm not good at selling things. I do plan to have the
best estate auction anybody has ever seen. I think, he who dies with
the most toys, wins.

karl

[Ignoramus6048]

On 2013-03-22, Karl Townsend wrote:
On Thu, 21 Mar 2013 21:31:19 -0500, Ignoramus3931
wrote:

On 2013-03-22, Pete C. wrote:

Ignoramus3931 wrote:

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

Nice, but haven't you found a thread mill for $1 yet?

I have not! But I should start looking.

i

twice now, the auctioneer has called them taps. Makes for a really
good deal, I got one lot of 30 "taps" for $100. Even overheard one guy
saying that guy was crazy bidding $100 on taps.

Karl


Yep, definitely fun to listen to comments like thhis!

[PrecisionmachinisT]

"Ignoramus3931" wrote in message ...
My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.



For a 1MM pitch, a hand ground, single point hss threading tool probably would have worked just as well and would also have produced the correct root geometry.

[jon_banquer[_2_]]

On Mar 22, 12:52*pm, "PrecisionmachinisT"
wrote:
"Ignoramus3931" wrote in ...
My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

For a 1MM pitch, a hand ground, single point hss threading tool probably would have worked just as well and would also have produced the correct root geometry.

That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

[[email protected]]

On Mar 22, 8:28*pm, jon_banquer wrote:



That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. Maybe not the same as your
skills, but a skill never the less.


Dan

[jon_banquer[_2_]]

On Mar 22, 5:39*pm, " wrote:
On Mar 22, 8:28*pm, jon_banquer wrote:



That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. *Maybe not the same as your
skills, but a skill never the less.

Dan

Buying stuff for nothing is not a creative process.

It's just business.

[Transition Zone]

On Mar 22, 8:50*pm, jon_banquer wrote:
On Mar 22, 5:39*pm, " wrote:

On Mar 22, 8:28*pm, jon_banquer wrote:

That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. *Maybe not the same as your
skills, but a skill never the less.

Dan

Buying stuff for nothing is not a creative process.

It's just business.

Any five-finger discounts in that, as I assume?

[Ignoramus6048]

On 2013-03-23, wrote:
On Mar 22, 8:28?pm, jon_banquer wrote:

That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. Maybe not the same as your
skills, but a skill never the less.

Thanks.

Converting a Bridgeport milling machine to Linux is also a skill.

And yapping on forums about "having access to a friend's shop" is not
a skill.

As for single point threading, my current problem is that the spindle
has to be on brake. However, spindle brake right now is tied to
estop. It only activates when the mill is e-stopped, and deactivates
when the mill is out of estop. Fixing that requires me to spend a
considerable time writing emc2 logic statements (to interlock brake
and estop and spindle running safely). I do not have time for this
right now.

i

[jon_banquer[_2_]]

On Mar 22, 6:15*pm, Ignoramus6048
wrote:
On 2013-03-23, wrote:

On Mar 22, 8:28?pm, jon_banquer wrote:
That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. *Maybe not the same as your
skills, but a skill never the less.

Thanks.

Converting a Bridgeport milling machine to Linux is also a skill.

And yapping on forums about "having access to a friend's shop" is not
a skill.

As for single point threading, my current problem is that the spindle
has to be on brake. However, spindle brake right now is tied to
estop. It only activates when the mill is e-stopped, and deactivates
when the mill is out of estop. Fixing that requires me to spend a
considerable time writing emc2 logic statements (to interlock brake
and estop and spindle running safely). I do not have time for this
right now.

i

iggy has very few metalworking or welding skills even after many years
of posting here. He's a butcher/hack with no clues.

Gaining skills means paying your dues. iggy refuses to pay his dues
and he has no respect for others such as Precision Machinist. iggy has
kill filled Precision Machinist who, unlike Mark Wieber, refuses to
coddle and spoon feed iggy. The sad fact is that iggy can't handle
anyone who tells him the truth about his ****ed up approach to
metalworking and welding. He's on a series ego trip that for years has
prevented him from properly learning and acquiring the needed
metalworking and welding skills and it shows in almost every post iggy
makes.

[jon_banquer[_2_]]

On Mar 22, 6:15*pm, Ignoramus6048
wrote:
On 2013-03-23, wrote:

On Mar 22, 8:28?pm, jon_banquer wrote:
That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. *Maybe not the same as your
skills, but a skill never the less.

Thanks.

Converting a Bridgeport milling machine to Linux is also a skill.

And yapping on forums about "having access to a friend's shop" is not
a skill.

As for single point threading, my current problem is that the spindle
has to be on brake. However, spindle brake right now is tied to
estop. It only activates when the mill is e-stopped, and deactivates
when the mill is out of estop. Fixing that requires me to spend a
considerable time writing emc2 logic statements (to interlock brake
and estop and spindle running safely). I do not have time for this
right now.

i

"And yapping on forums about "having access to a friend's shop" is not
a skill"

Jealousy isn't a skill either, douchebag.

Neither is your bitching about the kind or prices I get for some of
the tools I sell in the lame e-mails you have sent me in the past.

[PrecisionmachinisT]

"Ignoramus6048" wrote in message
...
On 2013-03-23, wrote:
On Mar 22, 8:28?pm, jon_banquer wrote:

That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. Maybe not the same as your
skills, but a skill never the less.

Thanks.

Converting a Bridgeport milling machine to Linux is also a skill.

And yapping on forums about "having access to a friend's shop" is not
a skill.

As for single point threading, my current problem is that the spindle
has to be on brake.

No, it doesn't.

However, spindle brake right now is tied to
estop. It only activates when the mill is e-stopped, and deactivates
when the mill is out of estop. Fixing that requires me to spend a
considerable time writing emc2 logic statements (to interlock brake
and estop and spindle running safely). I do not have time for this
right now.

i

[Gunner Asch[_6_]]

On Fri, 22 Mar 2013 17:39:49 -0700 (PDT), "
wrote:

On Mar 22, 8:28Â*pm, jon_banquer wrote:



That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. Maybe not the same as your
skills, but a skill never the less.


Dan


Indeed it is. Very much of a skill..and it can be a high dollar one at
that.

Gunner

[Jim Wilkins[_2_]]

"Gunner Asch" wrote in message
...
On Fri, 22 Mar 2013 17:39:49 -0700 (PDT), "
wrote:
On Mar 22, 8:28 pm, jon_banquer wrote:

That would require building a skill. That's not iggy's bag. iggy
is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. Maybe not the same as your
skills, but a skill never the less.
Dan


Indeed it is. Very much of a skill..and it can be a high dollar one
at
that.
Gunner

I have the knack for buying at 5% of value but unfortunately never
acquired the salesman skills to sell for much more than that.
jsw

[pyotr filipivich]

Gunner Asch on Fri, 22 Mar 2013 20:44:15 -0700
typed in rec.crafts.metalworking the following:
On Fri, 22 Mar 2013 17:39:49 -0700 (PDT), "
wrote:

On Mar 22, 8:28*pm, jon_banquer wrote:



That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.

Buying stuff for nothing is a skill. Maybe not the same as your
skills, but a skill never the less.


Dan

Indeed it is. Very much of a skill..and it can be a high dollar one at
that.

Yep, heard of a guy who was buying stuff for a dollar and selling
it for two dollars, sometimes three. He said it was amazing how that
one to two percent markup really added up.
I decided not to enlighten him...
--
pyotr filipivich
"With Age comes Wisdom. Although more often, Age travels alone."

[Steve Walker[_10_]]

On 3/22/2013 20:28, jon_banquer wrote:
On Mar 22, 12:52 pm, "PrecisionmachinisT"
wrote:
"Ignoramus3931" wrote in ...
My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

For a 1MM pitch, a hand ground, single point hss threading tool probably would have worked just as well and would also have produced the correct root geometry.

That would require building a skill. That's not iggy's bag. iggy is
almost totally focused on buying stuff for nothing rather than
building skills.


I would say converting a machine to a different control, and writing
complex routines for doing unusual things with it constitute a real
skill. Don't forget his math abilities, second to nobody in this group.
He seems to find a LOT of spare time to enjoy doing things other than
buying and selling.

Check out his website, totally voluntary done by him.

People really only need to learn skills to complete the task at hand.

Read some of his posts about what he HAS done, and see how many you can do.

Sure, others may have different skillsets, but those who can and do, and
also post proof, are way above and beyond those who only brag.

I would much prefer to see all that people have done, than just read in
this newsgroup about stuff people have done.

"It ain't braggin' if you can do it." -- Yogi Berra





I wish I had enough spare time to do more, but gotta balance work,
family, rest, etc. What's left over my spare time. G


--
Steve Walker
(remove brain when replying)

[RogerN]

"Ignoramus3931" wrote in message
...

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

That's great!

I guess it would also work to make rifling guides, like 1 revolution in 9
inches or so?

RogerN

[Ignoramus7568]

On 2013-03-24, RogerN wrote:
"Ignoramus3931" wrote in message
...

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

That's great!

I guess it would also work to make rifling guides, like 1 revolution in 9
inches or so?

Sure, it could not care less if the step is 1 revolition per 9 inch or
0.09 inch. It does the same thing. By default, it calculates depth
based on 60 degree thread profile, but you can specify your desired
depth.

i