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Re: Cut off grider

 

I think it's always best to avoid grinding on the lathe unless there is a very good reason.? The grinding dust is hard to clean up effectively and wears everything.

If you have room for it, either a metal cutting band saw or a chop saw can be found on Craigslist for $50-100.? I like the band saw better as it is much quieter and doesn't fill the air with dust that is really unhealthy for people as well as machines.? Some people like to fix up old power hacksaws, or even build them from scratch. am

At 09:19 PM 11/10/2012 -0500, you wrote:

?

anyone else use one of those angle grinders with a cut off wheel on it to part off pieces inthe lathe??? I set the lathe to go very slowly, and use that grinder's cut off wheel and it produces a really nice cut....? I have a nice Porter Cable I picked up at Lowes and it's a treat to use....? goes through 3/8" plate steel like it's butter :-)

?

? anyone else use something like that or does everyone just use a hack saw to art off large pieces (1/2" or larger? suppose)?

?

just curious :-)

?

thanks!

Mike B
Re: Cut off grider

Jerry Durand
 

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On 11/10/2012 08:55 PM, SirJohnOfYork wrote:
?Be sure to protect the lathe bed from grinder wheel grit & dust...

?Having a will really change how you look at doing any number of projects. I got mine some years ago when dollars were bigger and 20% off coupons were honored at my local HF store, even on items which were already on sale.

My wife was using our 4x6 earlier this week to make some small angle brackets for a customer's project and cutting up some 3" x 6" tube for another one.? I did have to modify my 4x6 bandsaw so a 3x6" tube would actually fit in it.? Must be those metric conversions.? :)

-- 
Jerry Durand, Durand Interstellar, Inc.  
tel: +1 408 356-3886, USA toll free: 1 866 356-3886
Skype:  jerrydurand

Re: Cut off grider

 

On 11/10/2012 9:19 PM, Exibar wrote:
anyone else use one of those angle grinders with a cut off wheel on it to part off pieces inthe lathe? I set the lathe to go very slowly, and use that grinder's cut off wheel and it produces a really nice cut.... I have a nice Porter Cable I picked up at Lowes and it's a treat to use.... goes through 3/8" plate steel like it's butter :-)
Yes, I cut off a few pieces that way before I got my bandsaw. Although you can get a decent cut with an angle grinder as long as you're careful, I greatly prefer using a bandsaw. I can get just as good a cut and don't have to worry about screwing up my lathe if I slip with the angle grinder. Plus, I didn't like getting grinding dust into my lathe, which can be very hard to clean out. The dust goes everywhere. Not just where you can see it.

Jim
Re: Cut off grider

 

¿ªÔÆÌåÓý

?Be sure to protect the lathe bed from grinder wheel grit & dust...

?Having a will really change how you look at doing any number of projects. I got mine some years ago when dollars were bigger and 20% off coupons were honored at my local HF store, even on items which were already on sale.
On 11/10/2012 9:19 PM, Exibar wrote:

anyone else use one of those angle grinders with a cut off wheel on it to part off pieces inthe lathe??? I set the lathe to go very slowly, and use that grinder's cut off wheel and it produces a really nice cut....? I have a nice Porter Cable I picked up at Lowes and it's a treat to use....? goes through 3/8" plate steel like it's butter :-)
Re: Pipe threading on a mini lathe ?

 

¿ªÔÆÌåÓý

?
On 11/10/2012 8:25 PM, Roy wrote:

A taper attachment controls the cross slide, allowing it to cut tapers.



"Die Holder" is a reasonable enough name for a device that holds a die;-) They're available in sizes to hold most common dies. The nicest thing about using them is having the die held straight - it makes threading much easier.

Roy

--- In 7x12minilathe@..., John Kiely wrote:
>
> 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)
>

Aside from pipes and camera cable releases where else are tapered pipe threads used?

 

Classical meter wheel and four dial counter blocks from KAHLSICO.

In my 28 year working life on National Oceanographic and Atmospheric Research ships as an oceanographic
technician I often had to deal with the devices that measured amount of cable going out (and hopefully coming back!).

The technology of the times late 60s to mid 90s (in my career)?used a stainless steel grooved wheel with a nominal circumference of
one meter that was suspended from a gantry or A-frame to allow working room for instrument packages. The wheel used a cable
similar to a speedometer cable to connect to a mechanical contrivance with four dials to cover units, tens, 100s and thousands of
meters. The meter wheel and four dial block used male threads to connect to female threads on end fittings of the connecting cable.
I was essentialy self taught on the job with my own Unimat at first then later got some end of fiscal year money to buy a Unimat for
my department. I determined that the threads were 5/16-24 which is a National Extra Fine so got a die and taps through govt supply
system. Much later found that it was actually a ?x27 pipe thread. The NEF tap did work.
My conjecture is that the NPT was used so the connections could be put on tight.

Anyway, my query here is if anyone else has some examples of where pipe threads are used but not on pipes.

Larry Murray
Re: Keyway Broach

 

--- In 7x12minilathe@..., Malcolm Parker-Lisberg <mparkerlisberg@...> wrote:

That tends to be expensive tooling.
Lowest cost, mount a cutter in the lathe toolpost, lock the spindle and wind the saddle backwards and forwards, or make an attachment for your lathe like this, see:
<>

Malcolm
Intereszting video... How long did it take to cut the slot on the (delrin?) gear?
What would the cost of making the lathe spindle lock, and the broaching tool holder cost?

I guess if you consider spending $100 - $150 on an a cheap chinese arbor press expensive then I suppose it is... Personally I would consider it an investment in tooling up...

I have found from personal experience that sometimes in this hobby, its simply a better end reszult to buy something made for the job at hand than it is to codge up something, unless its a 1 off...

Making your own press could be done a bit cheaper than buying one if you have the skills...



@Paul yes I agree he should have that arbor press bolted to az bench indeed...

My intention was only to show the OP how broaching is actually done because from his initial post it sounded (to me at least) that he was not sure how to go about using the broach...

Yes the video drags out a bit but then for those of us (including myself) that have NEVER done broaching before, it explains it quite well...
Cut off grider

 

¿ªÔÆÌåÓý

anyone else use one of those angle grinders with a cut off wheel on it to part off pieces inthe lathe??? I set the lathe to go very slowly, and use that grinder's cut off wheel and it produces a really nice cut....? I have a nice Porter Cable I picked up at Lowes and it's a treat to use....? goes through 3/8" plate steel like it's butter :-)

?

? anyone else use something like that or does everyone just use a hack saw to art off large pieces (1/2" or larger? suppose)?

?

just curious :-)

?

thanks!

Mike B
Re: Thread Protector

 

That's a non-standard thread, you're probably not going to find it in a common drill size table. The easy way to figure the size is by subtracting 1/TPI from the nominal thread diameter.

Drill Size = 1/2 - 1/28 = 13/28 = 0.464

The closest common drill size is 15/32, 0.469"

Roy

--- In 7x12minilathe@..., Pete Lilja <plilja@...> wrote:

I'm planning to make a thread protector for a rifle barrel. My reference
material doesn't list the drill bit size for a 1/2" x 28 TPI thread. Can
anyone help?

Pete
Re: Pipe threading on a mini lathe ?

 

A taper attachment controls the cross slide, allowing it to cut tapers.



"Die Holder" is a reasonable enough name for a device that holds a die;-) They're available in sizes to hold most common dies. The nicest thing about using them is having the die held straight - it makes threading much easier.

Roy

--- In 7x12minilathe@..., John Kiely <john_kiely@...> wrote:

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 <roylowenthal@...>
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 <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 !



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Re: Thread Protector

 

¿ªÔÆÌåÓý

WAM wrote......I think it's listed in this old PDF printout of some website I made a while back:.......
?
I don't know about anyone else, but this didn't come through for me. However, if it is a 60deg thread, then the tapping drill size is the major diameter minus the pitch, which would make this 13/28" which rounds nicely to 11.8mm dia.
Cheers.
??????? Ellis
Re: Thread Protector

 

Pete, Try Paul's "Drill Sizes pdf" in the Group's Files - it's around 2/3 way down the list of files, and tapping sizes are on the third or fourth page.

Abdy

--- In 7x12minilathe@..., Pete Lilja <plilja@...> wrote:

I'm planning to make a thread protector for a rifle barrel. My reference
material doesn't list the drill bit size for a 1/2" x 28 TPI thread. Can
anyone help?

Pete
Re: Thread Protector

 

I think it's listed in this old PDF printout of some website I made a while back:






Pete Lilja wrote:

I'm planning to make a thread protector for a rifle barrel. My reference
material doesn't list the drill bit size for a 1/2" x 28 TPI thread. Can
anyone help?

Pete
Re: Thread Protector

MERTON B BAKER
 

¿ªÔÆÌåÓý

That's a standard size, I think, NSF.? I think 1/4-28 is NF.
Mert
?

-----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of Pete Lilja
Sent: Saturday, November 10, 2012 2:48 PM
To: 7x12minilathe@...
Subject: [7x12minilathe] Thread Protector

I'm planning to make a thread protector for a rifle barrel.? My reference material doesn't list the drill bit size for a 1/2" x 28 TPI thread.? Can anyone help?

Pete
Re: Thread Protector

John Mattis
 

According to my "Machinery's Hdbk. 17 edition" for an external thread the major diameter is 0.4989 - 0.4924 and for an internal thread the dimensions are 0.461 - 0.470.
John


From: Pete Lilja
To: 7x12minilathe@...
Sent: Saturday, November 10, 2012 11:48 AM
Subject: [7x12minilathe] Thread Protector

?
I'm planning to make a thread protector for a rifle barrel.? My reference material doesn't list the drill bit size for a 1/2" x 28 TPI thread.? Can anyone help?

Pete
Re: Keyway Broach

Malcolm Parker-Lisberg
 

That tends to be expensive tooling.
Lowest cost, mount a cutter in the lathe toolpost, lock the spindle and wind the saddle backwards and forwards, or make an attachment for your lathe like this, see:


Malcolm

?
I don't suffer from insanity I enjoy it!
Mene, mene, tekel, upharsin
The writing is on the wall.
From: iamcruzinincognito
To: 7x12minilathe@...
Sent: Saturday, November 10, 2012 10:21 AM
Subject: [7x12minilathe] Re: Keyway Broach

?
here is a brilliant video by tubal cain regarding broaching keyways that might help explain the process to you...
Thread Protector

 

I'm planning to make a thread protector for a rifle barrel.? My reference material doesn't list the drill bit size for a 1/2" x 28 TPI thread.? Can anyone help?

Pete
Re: Keyway Broach

fixedgearhead
 

That was agonizing to watch!.... My god, bolt that thing to a bench!! broaching is easy, he makes it look dangerous.

Just my 2c

Paul

--- In 7x12minilathe@..., "iamcruzinincognito" <e__desilva@...> wrote:

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 ?

 

Those would be fine for taking a short nipple out of a fitting, but I don't think they would work well for *making* nipples. To do that, you'd need a longer item with a pipe-OD section to for the die stock to guide on.

All this is why pipefitters keep assortments of nipples around.? To thread conveniently, you need enough length for the vise to grip, and for the die stock to guide on.? Or the equivalent for powered threading equipment.? Depending on the equipment, that's maybe around six inches or so.? Below that, you have to grip the pipe from the inside with a nipple chuck and the cost in time and effort is a lot more than just buying the nipple.

Of course, you can set up the die in a lathe.? But there is a lot of torque involved in pipe threading--it's a brute force sort of thing.? Not likely to be easy on the machine.? Might make sense for really small sizes.....

At 03:02 AM 11/10/2012 +0000, you wrote:

?

There used to be expanding internal pipe wrenches that could hold a short piece:



Roy

--- In 7x12minilathe@..., "olduhfguy" 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 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: glad to present my page

 

Cool stuff!

Do you happen to have the english translation of the lang.txt file for hte gears program?

Any instructions?

I tried the newer beta (11-08-2012 and it didn't work but the 10-24-2012 version does...

bronz_ghost wrote:

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


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