Re: Pipe threading on a mini lathe ?
Ah, well, the whole point of having a lathe is to make stuff
yourself.......anybody can buy one, only the exceptional can make their
own......
At 03:04 AM 11/10/2012 +0000, you wrote:
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Show quoted text
?
Wow, you're right ! I Googled it and came up with a 1" nipple chuck
for $35+ shipping or a complete set for $350+ !
I'm still happy I made one - I can use the price difference to buy more
bar stock and make more chips :)
Thanks-Pete
--- In
7x12minilathe@..., Alan Muller
wrote:
>
> You can buy a tool called a "nipple chuck" for this very
purpose.
>
> Alan
>
> At 10:08 PM 11/9/2012 +0000, you wrote:
> >
> >
> >I need to be able to create/re-thread close pipe
> >nipples and initially figured to use the lathe
> >to do it. However, I ended up taking the 'easy'
> >way out - I fabricated an expandable mandrel out
> >of 1" bar stock and used it to extend the
> >capability of my normal pipe threader.
> >
> >Just didn't want to leave any stone un-turned !
> >
> >--- In
>
><
mailto:7x12minilathe%40yahoogroups.com
>
7x12minilathe@...,
> >John Kiely wrote:
> > >
> > > No I actually meant the headstock, I have a
> > couple of "antique lathes" and giving the
> > headstock a little bit of yaw is much easier on them than on
the Mini!
> > > Doing the same on the mini, well you will notice , I
didn't recommend it!
> > >
> > > John
> > >
> > >
> > >
> >
> >
>
|
Re: Pipe threading on a mini lathe ?
a?BSP die, cuts the thread and the taper at the same time, so it takes a bit of effort and the thread is a bit rough, but it works !
Regards? jb
|
--- On Sat, 10/11/12, John Kiely wrote:
From: John Kiely
Subject: Re: [7x12minilathe] Re: Pipe threading on a mini lathe ?
To: "7x12minilathe@..." <7x12minilathe@...>
Date: Saturday, 10 November, 2012, 12:27
Roy, I have a real cheapy mini?lathe that has the Headstock locked down with just 4 bolts! Slightly easier but a PITA none the less.
So I am not arguing with you : ) .
I also have an attachment that inserts in to the tailstock which takes hex dies, I have no dies mind you, but if I had a set of?plumbers die's it would be a reasonably easy task to cut pipe threads.
Now I don't know if this is the same thing as a taper attachment, but using this device I would have to?turn a small taper first and then cut the threads using the hex die holder.
There is probably a proper name to go with the device I describe, but I am new and I am not a plumber so forgive my ignorance.
With the "Hex Die Holder?" placed in the tailstock there is horizontal movement for the die along the bed axis, so as the pipe in your chuck turns and the die cuts the pipe, the forward movement is allowed but no rotational movement.
?
When I bought my "Antique lathe" I was given?a bucket of "junk" with it and in that bucket was a bunch of usefull stuff including the hex die holder. I have not as yet had a reason to use it.
?
John Kiely (IRL)
From: Roy
To: 7x12minilathe@...
Sent: Saturday, November 10, 2012 2:42 AM
Subject: [7x12minilathe] Re: Pipe threading on a mini lathe ?
It'd be a real PITA to do; the HS angular position is controlled by it having a V groove that mates with the raised V on the bed. Roy --- In , John Kiely wrote: > > I don't think I would recommend this but has anyone tried offsetting the headstock a fraction of a degree?as can be done on older lathes? > My little mini has it's cowl removed now and it would be feasible to angle your work to introduce a taper and then cut your threads. > It might be an awful pain to line? it up again! > ? > Just a thought > ? > John Kiely > > > ________________________________ > From: Roy > To: > Sent: Friday, November 9, 2012 2:59 AM > Subject: [7x12minilathe] Re: Pipe threading on a
mini lathe ? > > You need a taper attachment to cut a truly accurate tapered thread. Considering their uses, that's almost an oxymoron! Without a taper attachment, the work-around is to cut a stepped thread & refine it into a tapered thread either by finishing it with a pipe die or lots of fiddling with thread files. > > Roy > > --- In , "olduhfguy" wrote: > > > > I have seen a couple of articles on a taper turning attachment for a mini lathe. It appears the makers are using it primarily to make Morse taper shanks. Is this the only acceptable way to cut tapered (NPT) pipe threads ? If that is the case I would be better off to stick with machines that are designed to cut pipe threads, but
I thought I would ask since the quality that comes out of most threading machines leaves something to be desired by machinists standards. Thanks ! > > > > > > > ------------------------------------ > > Yahoo! Groups Links > > > > ? ? http://docs.yahoo.com/info/terms/ > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: ? ? http://groups.yahoo.com/group/7x12minilathe/ <*> Your email settings: ? ? Individual Email | Traditional <*> To change settings online go to: ? ? ? ? (Yahoo! ID required) <*> To change settings via email: ? ? ? ? <*> To unsubscribe from this group, send an email to: ? ? <*> Your use of Yahoo! Groups is subject to: ? ?
|
Re: Pipe threading on a mini lathe ?
Roy, I have a real cheapy mini?lathe that has the Headstock locked down with just 4 bolts! Slightly easier but a PITA none the less.
So I am not arguing with you : ) .
I also have an attachment that inserts in to the tailstock which takes hex dies, I have no dies mind you, but if I had a set of?plumbers die's it would be a reasonably easy task to cut pipe threads.
Now I don't know if this is the same thing as a taper attachment, but using this device I would have to?turn a small taper first and then cut the threads using the hex die holder.
There is probably a proper name to go with the device I describe, but I am new and I am not a plumber so forgive my ignorance.
With the "Hex Die Holder?" placed in the tailstock there is horizontal movement for the die along the bed axis, so as the pipe in your chuck turns and the die cuts the pipe, the forward movement is allowed but no rotational movement.
?
When I bought my "Antique lathe" I was given?a bucket of "junk" with it and in that bucket was a bunch of usefull stuff including the hex die holder. I have not as yet had a reason to use it.
?
John Kiely (IRL)
From: Roy To: 7x12minilathe@... Sent: Saturday, November 10, 2012 2:42 AM Subject: [7x12minilathe] Re: Pipe threading on a mini lathe ? It'd be a real PITA to do; the HS angular position is controlled by it having a V groove that mates with the raised V on the bed. Roy --- In 7x12minilathe@..., John Kiely wrote: > > I don't think I would recommend this but has anyone tried offsetting the headstock a fraction of a degree?as can be done on older lathes? > My little mini has it's cowl removed now and it would be feasible to angle your work to introduce a taper and then cut your threads. > It might be an awful pain to line? it up again! > ? > Just a thought > ? > John Kiely > > > ________________________________ > From: Roy > To: 7x12minilathe@... > Sent: Friday, November 9, 2012 2:59 AM > Subject: [7x12minilathe] Re: Pipe threading on a mini lathe ? > > You need a taper attachment to cut
a truly accurate tapered thread. Considering their uses, that's almost an oxymoron! Without a taper attachment, the work-around is to cut a stepped thread & refine it into a tapered thread either by finishing it with a pipe die or lots of fiddling with thread files. > > Roy > > --- In 7x12minilathe@..., "olduhfguy" wrote: > > > > I have seen a couple of articles on a taper turning attachment for a mini lathe. It appears the makers are using it primarily to make Morse taper shanks. Is this the only acceptable way to cut tapered (NPT) pipe threads ? If that is the case I would be better off to stick with machines that are designed to cut pipe threads, but I thought I would ask since the quality that comes out of most threading machines leaves something to be desired by machinists
standards. Thanks ! > > > > > > > ------------------------------------ > > Yahoo! Groups Links > > > > ? ? http://docs.yahoo.com/info/terms/ > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: ? ? http://groups.yahoo.com/group/7x12minilathe/ <*> Your email settings: ? ? Individual Email | Traditional <*> To change settings online go to: ? ? ? ? (Yahoo! ID required) <*> To change settings via email: ? ? 7x12minilathe-digest@... ? ? 7x12minilathe-fullfeatured@...<*> To unsubscribe from this group, send an email to: ? ? 7x12minilathe-unsubscribe@...<*> Your use of Yahoo! Groups is subject to: ? ?
|
here is a brilliant video by tubal cain regarding broaching keyways that might help explain the process to you...
|
Re: Pipe threading on a mini lathe ?
Didn't think of that one.
Mert
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Show quoted text
-----Original Message----- From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of Roy Sent: Friday, November 09, 2012 9:46 PM To: 7x12minilathe@... Subject: [7x12minilathe] Re: Pipe threading on a mini lathe ? Another place they're used is on cable releases for photography. Those are much smaller than pipe threads. Roy --- In 7x12minilathe@..., "MERTON B BAKER" <mertbaker@...> wrote:
My thought on this, is "Who needs a tapered thread?" My answer is
"Pipefitters". When I was a pipefitter, I had a nice tripod vise and a
set of pipe dies. I still have 'em, but haven't used 'em for 50 years.
Plumbing has advanced.
Mert
-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of john baird
Sent: Friday, November 09, 2012 7:02 AM
To: 7x12minilathe@...
Subject: Re: [7x12minilathe] Re: Pipe threading on a mini lathe ?
A pipe threading machine cuts rough taper threads, because that is all that is required to join pipes to fittings,it cuts fast and in one pass.
A machine taper thread is a totally different animal.
To cut pipe threads in a lathe is not practical.
1- the pass through of the spindle bore
2- supporting and stabilising the free end of the pipe
Regards jb
--- On Thu, 8/11/12, andyf1108 <andyf.1108@...> wrote:
--- In 7x12minilathe@...,
"olduhfguy" <phbrush@> wrote:
I have seen a couple of articles on a taper turning
attachment for a mini lathe. It appears the makers are using
it primarily to make Morse taper shanks. Is this the only
acceptable way to cut tapered (NPT) pipe threads ? If that
is the case I would be better off to stick with machines
that are designed to cut pipe threads, but I thought I would
ask since the quality that comes out of most threading
machines leaves something to be desired by machinists
standards. Thanks !
------------------------------------
Yahoo! Groups Links
??? ??? 7x12minilathe-fullfeatured@...
------------------------------------
Yahoo! Groups Links
------------------------------------ Yahoo! Groups Links
|
Hi All!
I glad to present my mini-lathe page:
It originally written on Russian and translated via Google so if there are some error or misunderstandings feel free to ask me in comments on that page.
WBR,
Dmitry
|
Re: carbide indexable tips
On 11/09/2012 09:19 PM, Wes Dean wrote:
It's funny the
information that does not seem to be readily available online
for newbies like me... I have a LMM 8.5x16
So, I have some 3/8" indexable turning bars.
What angle do I want on the tips to the material? Do you use the
pointy tip directly pointing, or use it so that one side is
almost even with the material?
If you're cutting threads, 29.5 degrees.? Cutting other items...it
depends...
Also, anyone
used these tips?
I have a different size, TCMT 2151 C5.
I'm turning mostly cold rolled and stainless. Is there any more
desirable C# for the carbide tips?
Or should I be using HSS tips?
HSS is your workhorse tip.? Cheap, easy to sharpen, hard to damage,
works well with light cuts.
With the turning kit from LMM, I seem to have chipped the tips
and worn them out pretty quickly. Am I turning to slow or fast?
Or advancing to quickly on the material?
Carbide chips easily, especially cheap carbide.? If it gets any
impact (like an interrupted cut...cutting over a groove or
something), they'll break.
I found one message board where they were saying you always want
blueish ribbons (golden for SS) when you are turning?
I doubt you'll ever get a mini-lathe to get a chip that hot.? That's
for production cutting which is where carbide excels.? Pedal to the
metal on the motor power cutting fast and hard.
What does the tip radius matter?
Larger radius is harder to break and leaves a smoother finish.?
Finer tip if you need a sharp groove.? Again, "it depends".
--
Jerry Durand, Durand Interstellar, Inc.
tel: +1 408 356-3886, USA toll free: 1 866 356-3886
Skype: jerrydurand
|
It's funny the information that does not seem to be readily available online for newbies like me... I have a LMM 8.5x16 So, I have some 3/8" indexable turning bars. What angle do I want on the tips to the material? Do you use the pointy tip directly pointing, or use it so that one side is almost even with the material? Also, anyone used these tips? http://www.anytimesale.com/servlet/the-223/inserts/Detail I'm turning mostly cold rolled and stainless. Is there any more desirable C# for the carbide tips? Or should I be using HSS tips? With the turning kit from LMM, I seem to have chipped the tips and worn them out pretty quickly. Am I turning to slow or fast? Or advancing to quickly on the material? I found one message board where they were saying you always want blueish ribbons (golden
for SS) when you are turning? What does the tip radius matter? Thanks, Wes ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
Re: Pipe threading on a mini lathe ?
Wow, you're right ! I Googled it and came up with a 1" nipple chuck for $35+ shipping or a complete set for $350+ !
I'm still happy I made one - I can use the price difference to buy more bar stock and make more chips :)
Thanks-Pete
toggle quoted message
Show quoted text
--- In 7x12minilathe@..., Alan Muller <alan@...> wrote:
You can buy a tool called a "nipple chuck" for this very purpose.
Alan
At 10:08 PM 11/9/2012 +0000, you wrote:
I need to be able to create/re-thread close pipe
nipples and initially figured to use the lathe
to do it. However, I ended up taking the 'easy'
way out - I fabricated an expandable mandrel out
of 1" bar stock and used it to extend the
capability of my normal pipe threader.
Just didn't want to leave any stone un-turned !
--- In
<mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...,
John Kiely <john_kiely@> wrote:
No I actually meant the headstock, I have a
couple of "antique lathes" and giving the
headstock a little bit of yaw is much easier on them than on the Mini!
Doing the same on the mini, well you will notice , I didn't recommend it!
John
|
Re: Pipe threading on a mini lathe ?
There used to be expanding internal pipe wrenches that could hold a short piece:
Roy
toggle quoted message
Show quoted text
--- In 7x12minilathe@..., "olduhfguy" <phbrush@...> wrote:
I need to be able to create/re-thread close pipe nipples and initially figured to use the lathe to do it. However, I ended up taking the 'easy' way out - I fabricated an expandable mandrel out of 1" bar stock and used it to extend the capability of my normal pipe threader.
Just didn't want to leave any stone un-turned !
--- In 7x12minilathe@..., John Kiely <john_kiely@> wrote:
No I actually meant the headstock, I have a couple of "antique lathes" and giving the headstock a little bit of yaw is much easier on them than on the Mini!
Doing the same on the mini, well you will notice , I didn't recommend it!?
?
John
|
Re: Pipe threading on a mini lathe ?
Another place they're used is on cable releases for photography. Those are much smaller than pipe threads.
Roy
toggle quoted message
Show quoted text
--- In 7x12minilathe@..., "MERTON B BAKER" <mertbaker@...> wrote:
My thought on this, is "Who needs a tapered thread?" My answer is
"Pipefitters". When I was a pipefitter, I had a nice tripod vise and a set
of pipe dies. I still have 'em, but haven't used 'em for 50 years.
Plumbing has advanced.
Mert
-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of john baird
Sent: Friday, November 09, 2012 7:02 AM
To: 7x12minilathe@...
Subject: Re: [7x12minilathe] Re: Pipe threading on a mini lathe ?
A pipe threading machine cuts rough taper threads, because that is all that
is required to join pipes to fittings,it cuts fast and in one pass.
A machine taper thread is a totally different animal.
To cut pipe threads in a lathe is not practical.
1- the pass through of the spindle bore
2- supporting and stabilising the free end of the pipe
Regards jb
--- On Thu, 8/11/12, andyf1108 <andyf.1108@...> wrote:
--- In 7x12minilathe@...,
"olduhfguy" <phbrush@> wrote:
I have seen a couple of articles on a taper turning
attachment for a mini lathe. It appears the makers are using
it primarily to make Morse taper shanks. Is this the only
acceptable way to cut tapered (NPT) pipe threads ? If that
is the case I would be better off to stick with machines
that are designed to cut pipe threads, but I thought I would
ask since the quality that comes out of most threading
machines leaves something to be desired by machinists
standards. Thanks !
------------------------------------
Yahoo! Groups Links
? ? 7x12minilathe-fullfeatured@...
------------------------------------
Yahoo! Groups Links
|
Re: Pipe threading on a mini lathe ?
It'd be a real PITA to do; the HS angular position is controlled by it having a V groove that mates with the raised V on the bed.
Roy
toggle quoted message
Show quoted text
--- In 7x12minilathe@..., John Kiely <john_kiely@...> wrote:
I don't think I would recommend this but has anyone tried offsetting the headstock a fraction of a degree?as can be done on older lathes?
My little mini has it's cowl removed now and it would be feasible to angle your work to introduce a taper and then cut your threads.
It might be an awful pain to line? it up again!
?
Just a thought
?
John Kiely
________________________________
From: Roy <roylowenthal@...>
To: 7x12minilathe@...
Sent: Friday, November 9, 2012 2:59 AM
Subject: [7x12minilathe] Re: Pipe threading on a mini lathe ?
You need a taper attachment to cut a truly accurate tapered thread. Considering their uses, that's almost an oxymoron! Without a taper attachment, the work-around is to cut a stepped thread & refine it into a tapered thread either by finishing it with a pipe die or lots of fiddling with thread files.
Roy
--- In 7x12minilathe@..., "olduhfguy" <phbrush@> wrote:
I have seen a couple of articles on a taper turning attachment for a mini lathe. It appears the makers are using it primarily to make Morse taper shanks. Is this the only acceptable way to cut tapered (NPT) pipe threads ? If that is the case I would be better off to stick with machines that are designed to cut pipe threads, but I thought I would ask since the quality that comes out of most threading machines leaves something to be desired by machinists standards. Thanks !
------------------------------------
Yahoo! Groups Links
? ?
|
Re: Pipe threading on a mini lathe ?
You can use the compound to cut the taper with no problem; what you can't do is cut threads on a taper without a taper attachment.
Roy
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Show quoted text
--- In 7x12minilathe@..., Chris Bailey <cbailey73160@...> wrote:
You can also use a protractor to adjust the compound to get VERY close.
This one is CHEAP but surprisingly accurate.
Chris
On Thu, Nov 8, 2012 at 8:59 PM, Roy <roylowenthal@...> wrote:
**
You need a taper attachment to cut a truly accurate tapered thread.
Considering their uses, that's almost an oxymoron! Without a taper
attachment, the work-around is to cut a stepped thread & refine it into a
tapered thread either by finishing it with a pipe die or lots of fiddling
with thread files.
Roy
--- In 7x12minilathe@..., "olduhfguy" <phbrush@> wrote:
I have seen a couple of articles on a taper turning attachment for a
mini lathe. It appears the makers are using it primarily to make Morse
taper shanks. Is this the only acceptable way to cut tapered (NPT) pipe
threads ? If that is the case I would be better off to stick with machines
that are designed to cut pipe threads, but I thought I would ask since the
quality that comes out of most threading machines leaves something to be
desired by machinists standards. Thanks !
|
Re: Pipe threading on a mini lathe ?
A second option is to insert a mill boring head sideways in the tail stock. You can use the screw adjuster to accurately set the taper. You will need a 60 degree center on a piece of stock
Later.... Randy S
Practice random kindness and commit senseless acts of beauty.
toggle quoted message
Show quoted text
On 11/9/2012 3:32 PM, michael kolchins wrote:
John,did you mean to say offsetting the tailstock? Offsetting the
headstock would be more trouble than it's worth. You did give me an idea
though,how about putting a 60¡ã point on a short round ,off set it in the
4 jaw .Then turn between centers using a dog like on a face plate.The
tail stock stays centered. I use an off set adjustable point similar to
a boring head. Mine has a #3 MT so it works in my lathe or mill.I also
have a larger lathe with a #3 MT in the tail stock You would need to
adapt the #3 MT to #2 MT for the mini-lathe.
mike
|
Re: Pipe threading on a mini lathe ?
You can buy a tool called a "nipple chuck" for this very
purpose.
Alan
At 10:08 PM 11/9/2012 +0000, you wrote:
toggle quoted message
Show quoted text
?
I need to be able to create/re-thread close pipe nipples and initially
figured to use the lathe to do it. However, I ended up taking the 'easy'
way out - I fabricated an expandable mandrel out of 1" bar stock and
used it to extend the capability of my normal pipe threader.
Just didn't want to leave any stone un-turned !
--- In
7x12minilathe@..., John Kiely
wrote:
>
> No I actually meant the headstock, I have a couple of "antique
lathes" and giving the headstock a little bit of yaw is much easier
on them than on the Mini!
> Doing the same on the mini, well you will notice , I didn't
recommend it!?
>?
> John
>
>
>
|
Re: Pipe threading on a mini lathe ?
I need to be able to create/re-thread close pipe nipples and initially figured to use the lathe to do it. However, I ended up taking the 'easy' way out - I fabricated an expandable mandrel out of 1" bar stock and used it to extend the capability of my normal pipe threader.
Just didn't want to leave any stone un-turned !
toggle quoted message
Show quoted text
--- In 7x12minilathe@..., John Kiely <john_kiely@...> wrote:
No I actually meant the headstock, I have a couple of "antique lathes" and giving the headstock a little bit of yaw is much easier on them than on the Mini!
Doing the same on the mini, well you will notice , I didn't recommend it!?
?
John
|
Re: Pipe threading on a mini lathe ?
No I actually meant the headstock, I have a couple of "antique lathes" and giving the headstock a little bit of yaw is much easier on them than on the Mini!
Doing the same on the mini, well you will notice , I didn't recommend it!? 
?
John
From: michael kolchins To: "7x12minilathe@..." <7x12minilathe@...> Sent: Friday, November 9, 2012 8:32 PM Subject: Re: [7x12minilathe] Re: Pipe threading on a mini lathe ?
John,did you mean to say offsetting the tailstock? Offsetting the headstock would be more trouble than it's worth. You did give me an idea though,how about putting a 60¡ã point on a short round ,off set it in the 4 jaw .Then turn between centers using a dog like on a face plate.The tail stock stays centered. I use an off set adjustable point similar to a ?boring head. Mine has a #3 MT so it works in my lathe or mill.I also have a larger lathe with a #3 MT in the tail stock You would need to adapt the #3 MT to #2 MT for the mini-lathe.
mike
From: John Kiely
To: "7x12minilathe@..." <7x12minilathe@...>
Sent: Friday, November 9, 2012 6:46 AM
Subject: Re: [7x12minilathe] Re: Pipe threading on a mini lathe ?
?
I don't think I would recommend this but has anyone tried offsetting the headstock a fraction of a degree?as can be done on older lathes?
My little mini has it's cowl removed now and it would be feasible to angle your work to introduce a taper and then cut your threads.
It might be an awful pain to line? it up again!
?
Just a thought
?
John Kiely
From: Roy
To: 7x12minilathe@...
Sent: Friday, November 9, 2012 2:59 AM
Subject: [7x12minilathe] Re: Pipe threading on a mini lathe ?
You need a taper attachment to cut a truly accurate tapered thread. Considering their uses, that's almost an oxymoron! Without a taper attachment, the work-around is to cut a stepped thread & refine it into a tapered thread either by finishing it with a pipe die or lots of fiddling with thread files. Roy --- In 7x12minilathe@..., "olduhfguy" wrote: > > I have seen a couple of articles on a taper turning attachment for a mini lathe. It appears the makers are using it primarily to make Morse taper shanks. Is this the only acceptable way to cut tapered (NPT) pipe threads ? If that is the case I would be better off to stick with machines that are designed to cut pipe threads, but I thought I would ask since the quality that comes out of most threading machines leaves something to be desired by machinists standards. Thanks ! > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: ? ? http://groups.yahoo.com/group/7x12minilathe/ <*> Your email settings: ? ? Individual Email | Traditional <*> To change settings online
go to: ? ? ? ? (Yahoo! ID required) <*> To change settings via email: ? ? 7x12minilathe-digest@... ? ? 7x12minilathe-fullfeatured@...<*> To unsubscribe from this group, send an email to: ? ? 7x12minilathe-unsubscribe@...<*> Your use of Yahoo!
Groups is subject to: ? ? http://docs.yahoo.com/info/terms/
|
Re: Pipe threading on a mini lathe ?
John,did you mean to say offsetting the tailstock? Offsetting the headstock would be more trouble than it's worth. You did give me an idea though,how about putting a 60¡ã point on a short round ,off set it in the 4 jaw .Then turn between centers using a dog like on a face plate.The tail stock stays centered. I use an off set adjustable point similar to a ?boring head. Mine has a #3 MT so it works in my lathe or mill.I also have a larger lathe with a #3 MT in the tail stock You would need to adapt the #3 MT to #2 MT for the mini-lathe. mike
From: John Kiely
To: "7x12minilathe@..." <7x12minilathe@...>
Sent: Friday, November 9, 2012 6:46 AM
Subject: Re: [7x12minilathe] Re: Pipe threading on a mini lathe ?
?
I don't think I would recommend this but has anyone tried offsetting the headstock a fraction of a degree?as can be done on older lathes?
My little mini has it's cowl removed now and it would be feasible to angle your work to introduce a taper and then cut your threads.
It might be an awful pain to line? it up again!
?
Just a thought
?
John Kiely
From: Roy
To: 7x12minilathe@...
Sent: Friday, November 9, 2012 2:59 AM
Subject: [7x12minilathe] Re: Pipe threading on a mini lathe ?
You need a taper attachment to cut a truly accurate tapered thread. Considering their uses, that's almost an oxymoron! Without a taper attachment, the work-around is to cut a stepped thread & refine it into a tapered thread either by finishing it with
a pipe die or lots of fiddling with thread files. Roy --- In 7x12minilathe@..., "olduhfguy" wrote: > > I have seen a couple of articles on a taper turning attachment for a mini lathe. It appears the makers are using it primarily to make Morse taper shanks. Is this the only acceptable way to cut tapered (NPT) pipe threads ? If that is the case I would be better off to stick with machines that are designed to cut pipe threads, but I thought I would ask since the quality that comes out of most threading machines leaves something to be desired by machinists standards. Thanks ! > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: ? ?
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Re: Pipe threading on a mini lathe ?
John,
That might work for very short sections of pipe, as they'd need to be between centers.
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--- In 7x12minilathe@..., John Kiely <john_kiely@...> wrote:
I don't think I would recommend this but has anyone tried offsetting the headstock a fraction of a degree?as can be done on older lathes?
My little mini has it's cowl removed now and it would be feasible to angle your work to introduce a taper and then cut your threads.
It might be an awful pain to line? it up again!
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Just a thought
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John Kiely
________________________________
From: Roy <roylowenthal@...>
To: 7x12minilathe@...
Sent: Friday, November 9, 2012 2:59 AM
Subject: [7x12minilathe] Re: Pipe threading on a mini lathe ?
You need a taper attachment to cut a truly accurate tapered thread. Considering their uses, that's almost an oxymoron! Without a taper attachment, the work-around is to cut a stepped thread & refine it into a tapered thread either by finishing it with a pipe die or lots of fiddling with thread files.
Roy
--- In 7x12minilathe@..., "olduhfguy" <phbrush@> wrote:
I have seen a couple of articles on a taper turning attachment for a mini lathe. It appears the makers are using it primarily to make Morse taper shanks. Is this the only acceptable way to cut tapered (NPT) pipe threads ? If that is the case I would be better off to stick with machines that are designed to cut pipe threads, but I thought I would ask since the quality that comes out of most threading machines leaves something to be desired by machinists standards. Thanks !
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Re: Looking at buying the 7" x 10" w/ Questions
Tom,
The power and righty required for a given depth of cut and feed rate are dependent more on tool geometry than anything else. With the proper tool geometry you will be able to take a much heavier cut than might be able to imagine. Thie tool geometry factor is the most important issue to consider when using a light duty lathe such as the 7 X 10 machine. I mention this only to present this fact as food for thought. I have experienced cutting situations that had me baffled until I experimented with various tool geometry.
Dick
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--- In 7x12minilathe@..., HOGWINSLOW@ wrote:
So I've decided on the HF 7" x 10" lathe. For the longest time I was leaning toward the Tiag Lathe. But my Grandfather left me his tools and most of them will work better with the HF. The Taig uses 1/4" tooling and the HF uses 5/16". He left me a bunch of 5/16" tool steel. Also all the drill chucks and centers he left me are all M-2 so they will fit the M-2 tailstock. But I have a few questions-
1. I want to turn a 1" diameter piece of steel to 5/8". Will the HF handle this? I've read that it slows down when turn steel. Are those people just tring to cut to much at once?
2. Once at 5/8" I need to thread it. Is the threading feature easy to use on the HF lathe?
3. I need to re-work some oil-lite bushings. The outer diameter of the bushings I buy is correct. But the inside needs to be bored from 1/2" to 5/8". Will the HF handle this within the accuracy needed for bushings? Would I be better of using a small boring bar or a 5/8" reamer (I happen to have one). The flange on the bushings also needs to be thinned but I'm sure that's easy enough.
4. I sometimes need to to take two slices from opposites sides of a round bar to be able to put a wrench on them. I've read that it's possible to chuck a end mill in the lathe and do slight milling. Do you feel this would be an option or is it wish full thinking?
5. I see a Prep Guide in the link section. Is this what's used to make all the initial adjustments when I first use it. From what I read I'll need to do a lot of tweeking to get it right.
Any help is appreciated and thanks in advance,
Tom
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OldToolmaker