¿ªÔÆÌåÓý

Date

Re: Finally, a project!

Jerry Durand
 

On 10/15/2011 12:22 AM, Bill Vance wrote:
Here's a possible for your list: "Workholding In The Lathe", by Tubal
Cain. It even includes some really old methods like glueing stuff to
the face plate with several glue recipes. I suspect this method isn't
in use that much these days, as after operations cleanup probably
involves something like one part turpentine, and 99 parts elbow
grease. :-) Bill
When I was testing military and aerospace parts we found a particular
"super glue" was handy for mounting the parts for shock testing. A tiny
drop held very well in tension and when the test was done a light tap
with a brass mallet on the side caused the glue to fail. A little
cleanup and put the next part on.

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


Re: Uni 3,w/threading att.,9masters,220v. motor. for sale

MERTON B BAKER
 

Dunno what the masters are selling for now. Email off list for pix. All
the masters are in their little boxes. I would probably get more selling
them separately rather than with the lathe, but they were together when I
bought it. The Thread Att. box goes with it. All offers thoughtfully
considered, and off list request for pix will be fulfilled.

Mert

mertbaker@...


Yahoo! Groups Links


Re: Buying a mini-lathe

 

¿ªÔÆÌåÓý

Everything I have stated is 'fair' (and true/correct)..
?
Also talking pricing.
?
I got my roughly 2+ years ago maybe..?
?
and I got mine for dirt cheap!
?
was on sale at HF (NOT ADVERTISED SALE).. just a call.. ask for price. saw it was $449..
?
went in.. used an ADDITIONAL 20% off coupon..? order it.. walked out paying $379+ after all was said and done and taxes..etc.
?
?
?

----- Original Message -----
Sent: Saturday, October 15, 2011 6:25 AM
Subject: RE: [7x12minilathe] Buying a mini-lathe

?

More on this price thing. I bought that 7x10 for just under $300 in the
early 90s. I paid $130 for the DB200 in 1958. According to the official US
government inflation calculator, the buying power of 130 1958 dollars equals
that of 431 dollars in 1990. The bare bones 7x10 is 20 times the lathe the
Uni is. It does lake the ability to be turned into a mill/drill, though.
Let's be fair.

Mert

-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of whispers [HM]
Sent: Friday, October 14, 2011 11:44 PM
To: 7x12minilathe@...
Subject: Re: [7x12minilathe] Buying a mini-lathe

MUCH MUCH more!!!

but keep in mind.. no variable speed control (all belt speeds)..

and I dont think there is a lead screw reverse lever.. (only if you run
chuck in opposite direction)

(without tumbler gear or whatever)

Go to fignoggle.com to see comparrison pics of the 7x vs the 8x.. The 7x
is like a shoe bow!

----- Original Message -----
From: John Brookes
To: 7x12minilathe@...
Sent: Friday, October 14, 2011 3:35 PM
Subject: [7x12minilathe] Buying a mini-lathe

The HF 8x14 now on sale for 699. With 20% coupon that reduces to 560.
The 8x14 is much more machine than the 7x.
j


Re: Buying a mini-lathe

MERTON B BAKER
 

More on this price thing. I bought that 7x10 for just under $300 in the
early 90s. I paid $130 for the DB200 in 1958. According to the official US
government inflation calculator, the buying power of 130 1958 dollars equals
that of 431 dollars in 1990. The bare bones 7x10 is 20 times the lathe the
Uni is. It does lake the ability to be turned into a mill/drill, though.
Let's be fair.

Mert

-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of whispers [HM]
Sent: Friday, October 14, 2011 11:44 PM
To: 7x12minilathe@...
Subject: Re: [7x12minilathe] Buying a mini-lathe





MUCH MUCH more!!!

but keep in mind.. no variable speed control (all belt speeds)..

and I dont think there is a lead screw reverse lever.. (only if you run
chuck in opposite direction)

(without tumbler gear or whatever)

Go to fignoggle.com to see comparrison pics of the 7x vs the 8x.. The 7x
is like a shoe bow!




----- Original Message -----
From: John Brookes
To: 7x12minilathe@...
Sent: Friday, October 14, 2011 3:35 PM
Subject: [7x12minilathe] Buying a mini-lathe



The HF 8x14 now on sale for 699. With 20% coupon that reduces to 560.
The 8x14 is much more machine than the 7x.
j


Re: Buying a mini-lathe

MERTON B BAKER
 

Maybe. If you need an extra inch of swing. If you don't mind changing
belts. If you never want to cut LH threads, or use the power feed to cut
toward the TS. If you need a lot more power than the &x series. I don't
know anything about the 8x14, except what I read on this list; don't even
think I've seen one in the catalogs. In my experience though, the 7x12,
(really a 7x14) is the best small lathe, which is a real engine lathe, for
anywhere near the price. I own 3 of 'em as well as a 7x10. They lack only
the 40 thread LS gearbox, separate power feed shaft, & cross slide power
feed, which I enjoy having on my 12x36, with the 2 HP 240 v. motor. I do
have to change belts for the 6 fast spindle speeds, and unscrew the bull pin
& engage the back gears for the 6 slow ones. It does have plenty of torque
at 30 rpm, though. I like the 1-3/8" hole thru the spindle, too. FWIW, I
bought a HF 7x10 out of curiosity about 20 years ago, and have been an
enthusiastic fan of the 7xs ever since. Especially, for someone with
limited space, (I have 1500 sf), & a limited budget, (I'm a retired
schoolteacher). I wish these were available in 1958 when I bought my Unimat
DB200.

Mert

-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of whispers [HM]
Sent: Friday, October 14, 2011 11:44 PM
To: 7x12minilathe@...
Subject: Re: [7x12minilathe] Buying a mini-lathe





MUCH MUCH more!!!

but keep in mind.. no variable speed control (all belt speeds)..

and I dont think there is a lead screw reverse lever.. (only if you run
chuck in opposite direction)

(without tumbler gear or whatever)

Go to fignoggle.com to see comparrison pics of the 7x vs the 8x.. The 7x
is like a shoe bow!




----- Original Message -----
From: John Brookes
To: 7x12minilathe@...
Sent: Friday, October 14, 2011 3:35 PM
Subject: [7x12minilathe] Buying a mini-lathe



The HF 8x14 now on sale for 699. With 20% coupon that reduces to 560.
The 8x14 is much more machine than the 7x.
j


Re: Where to buy magnetic-base work lamp

 

The quality of light is what will damage your eyes over time. The the CF
you get lots of light but you might not see detail well. It is in the
fine detail were accidents happen.

I use compare light to food as an example. You get lots of hamburgers
cheaply and are fed. But over time you pay for the savings in health
problems. With light the health problems will be injuries and poor eye
sight.

Cheers,

Andrew

On Sat, 2011-10-15 at 01:25 -0500, Michael Taglieri wrote:

I can see why "quality of light" would matter to someone matching
colors or
something, but why does it matter to machining? My shop is all CF
bulbs,
except one incandescent bulb near the lathe because I sometimes use it
as a
source of heat. (In fact, my whole house is CF bulbs except for one on
my
desk that my cat likes to sit under, again as a source of heat).

Mike Taglieri miket_nyc@...

Everyone has his reasons.
- Jean Renoir "The Rules of the Game"

----- Original Message ----- > On 09/26/2011 05:02 PM, Andrew wrote:

They phased out the 'normal" incandescent bulbs in Australia. The
only
decent alternative are halogen type. I found the CF give a lot of
light
but not the right type of light. Even the "warm" version did not
seem to
be the right quality of light.




Re: Finally, a project!

 

On Fri, Oct 14, 2011 at 05:21:50AM -0400, MERTON B BAKER wrote:
Date: Fri, 14 Oct 2011 05:21:50 -0400
From: MERTON B BAKER <mertbaker@...>
Subject: RE: [7x12minilathe] Re: Finally, a project!

Rome was no built in a day. I was not the foreman on that job though, and I
have advice. Keep your 7x12 for a while, buy a few books, (I'm making a
list, but there are some out there already)
Here's a possible for your list: "Workholding In The
Lathe", by Tubal Cain. It even includes some really
old methods like glueing stuff to the face plate with
several glue recipes. I suspect this method isn't in
use that much these days, as after operations cleanup
probably involves something like one part turpentine,
and 99 parts elbow grease. :-)

Bill


Play with your lathe, and make a
few projects. Find something to make that turns you on, and if it's too big
to fit on your 7x lathe build a working model that will. After 60 years in
this game, I can say that if you are really interested, nothing can stop
you.

Mert


Hardwick Machine "If you can pay, I can build it."


-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of nissan.370z
Sent: Friday, October 14, 2011 12:15 AM
To: 7x12minilathe@...
Subject: [7x12minilathe] Re: Finally, a project!


Surely need a larger lathe for that. Sounds like you are very new to lathes
like myself. Find some smaller projects to do, so you can learn more about
lathes and machining. Ask questions along the way etc., this way later on if
you decide to buy a larger lathe you will know much more and be able to get
use out of it right away.

I was going to wait till I had more room for a used SouthBend lathe much
larger than the 7x12 I purchased or get a 10x20 to start, but didn't want to
spend the money on a larger lathe when I have never used one yet (nor don't
really have the extra room for a large lathe "yet"). I have many small
projects to do and hope by the time I buy a large lathe I will be somewhat
knowledgeable with lathes and machining. So the more expensive lathe gets
used more and I can enjoy it.

good thing is, if you later upgrade to a larger lathe; these small lathes
seem to hold their value VERY well as I have seen used ones selling for
recently. I want to convert mine to CNC when I get a larger one though.

--- In 7x12minilathe@..., "wy3xinsc" <wy3xinsc@...> wrote:

I finally have a project where I'm hoping to use my mini-lathe, to make
some of the parts at least.

Question- and I hope nobody thinks this is a dumb one..

My lathe is a 7 x 12. Is it practical (or even possible) to turn and bore
a piece of 1018 steel round stock that is precisely that size? (7" round by
12" long). That's the largest piece of the project. All other parts I have
no doubt about the lathe being useable. If it won't work, I'll have to farm
out at least that one part.

Admitted, I think I'll have to buy a new chuck large enough to accept this
stock (if such a chuck exists, which is my next question), but will the
lathe do this job without destroying itself?

Thanks, -Web in Myrtle Beach, SC



------------------------------------

Yahoo! Groups Links



Re: Where to buy magnetic-base work lamp

Michael Taglieri
 

I can see why "quality of light" would matter to someone matching colors or
something, but why does it matter to machining? My shop is all CF bulbs,
except one incandescent bulb near the lathe because I sometimes use it as a
source of heat. (In fact, my whole house is CF bulbs except for one on my
desk that my cat likes to sit under, again as a source of heat).

Mike Taglieri miket_nyc@...

Everyone has his reasons.
- Jean Renoir "The Rules of the Game"

----- Original Message ----- > On 09/26/2011 05:02 PM, Andrew wrote:

They phased out the 'normal" incandescent bulbs in Australia. The only
decent alternative are halogen type. I found the CF give a lot of light
but not the right type of light. Even the "warm" version did not seem to
be the right quality of light.


Re: Buying a mini-lathe

 

Is there a 20 per cent coupon code that will work with sale items? I just tested Coupon Code : DISC20 and no-go.

Thanks
Cliff

--- In 7x12minilathe@..., John Brookes <haiticare2011@...> wrote:

The HF 8x14 now on sale for 699. With 20% coupon that reduces to 560. The 8x14 is much more machine than the 7x.
j


Re: Buying a mini-lathe

 

¿ªÔÆÌåÓý

MUCH MUCH more!!!
?
but keep in mind.. no variable speed control (all belt speeds)..
?
and I dont think there is a lead screw reverse lever..? (only if you run chuck in opposite direction)
?
(without tumbler gear or whatever)
?
Go to fignoggle.com to see comparrison pics of the 7x vs the 8x..? The 7x is like a shoe bow!
?
?
?
?

----- Original Message -----
Sent: Friday, October 14, 2011 3:35 PM
Subject: [7x12minilathe] Buying a mini-lathe

?

The HF 8x14 now on sale for 699. With 20% coupon that reduces to 560. The 8x14 is much more machine than the 7x.
j


Re: Finally, a project!

MERTON B BAKER
 

Nope. Military mortars have the propellant in the rear of the projectile,
together with the primer. When the projectile is dropped down the tube, a
projection in the base goes into the propellant tube and fires it, sort of
like a reversed gun, with the bullet held still in the base of the mortar,
and the barrel, with the tail fins on it, goes out with the mortar shell.
Not sure how RPGs work; were they true rockets, like those fired from a
bazooka, the escaping gas would fry the firer. There is a lethal zone for
several yards to the rear of one of those when it's fired. In a mortar,
the gas pressure behind the projectile is quite low, once it's on its way up
the tube.

Mert

-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of Jerry Durand
Sent: Friday, October 14, 2011 4:23 PM
To: 7x12minilathe@...
Subject: Re: [7x12minilathe] Re: Finally, a project!


On 10/14/2011 10:56 AM, MERTON B BAKER wrote:
Propellant powders have improved drastically since those days. Modern
mortar tubes to not have to contain the explosion, and are made a thin and
light as possible. They serve only the guidance function.
Are you thinking of rocket propelled grenades? Fireworks have a big
ball or cylinder sitting on a bag of black powder, they are NOT rockets
no matter how many reporters call them that. These are mortars in the
old sense, big pipe with a big bang at the bottom blowing a heavy thing
out the other end.


I also make rockets but they're not for public displays (too expensive
and way too dangerous for anything but a closed range in the middle of
nowhere).

ts_12-14.JPG

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



------------------------------------

Yahoo! Groups Links


Buying a mini-lathe

 

The HF 8x14 now on sale for 699. With 20% coupon that reduces to 560. The 8x14 is much more machine than the 7x.
j


Re: lathe table

 

¿ªÔÆÌåÓý

My lathe table top?is a 4 foot wide piece of kitchen laminated counter top. Picked it up at Home Depot a few years ago for like $20. Made the base out of 2x4s and lag screws. The top has a nice back splash built into it to keep things from rolling off the back of it, and the front has the common raised rolled lip to keep things from rolling and dripping off the front.
?
Michael
?
?

-----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of george curtis
Sent: Thursday, October 13, 2011 4:15 PM
To: 7x12minilathe@...
Subject: [7x12minilathe] lathe table

?

my bil is gonna put my lathe table together for me. we are wanting to know what is best to protect the table, mdf, before we put the lathe on.

thanks,

?

george


Re: lathe table

 

hmmm. About tables, the easiest table is a 21$ wood door from Home Despot and plastic saw horses underneath. You can varnish the wood door, or just flip it over in a year. The door has a nice wood grain finish that is pleasant to look at.
Some will say this is too flimsy. I would have thought so myself, until recently I put wheels on my very rigid lathe table. The rubber wheels make the table pretty squishy, but the operation of the lathe does not seem to be affected. I am not even aware of it as I work with the lathe. ?I work with a 8x14 lathe HF.
JB


On Oct 14, 2011, at 2:14 PM, Clint wrote:



Can I get some details on the solution that you mentioned?? I have an epoxy garage floor that I need to clean.? Normal floor cleaners do not seem to work.
?
Regards,
Clint
?
Sent:?Friday, October 14, 2011 10:39 AM
Subject:?Re: [7x12minilathe] Re: lathe table
?

A mixture of Simple Green and Dawn work great as a cleaner for the epoxy.? If you work in your garage and prone to dropping small parts on the floor, like myself, those little paint chips they provide to help break up the color are your worst enemy.? It is amazing how it helps to hide small parts like scope mounting screws and springs.

-rw
?

From:?Vince Vielhaber <vev@...>
To:?"7x12minilathe@..." <7x12minilathe@...>
Sent:?Friday, October 14, 2011 10:28 AM
Subject:?Re: [7x12minilathe] Re: lathe table

?

Well I'm glad I didn't put it on my floor then. I clean alot of oily?
things with brake clean and don't always do it over the sink.

On Fri, 14 Oct 2011, Randal Williams wrote:

> The drying time of the epoxy when you roll it on the floor is stated to be 7 days.? I have done three different garages with the stuff.? You can get it to dissolve with carb or brake cleaner if you are not careful.? The recommendation for putting a large aluminum pan under the lathe is excellent.
>
> -rw
>
>
>
> ________________________________
> From: Vince Vielhaber <mailto:vev%40michvhf.com>
> To:?mailto:7x12minilathe%40yahoogroups.com
> Sent: Friday, October 14, 2011 9:35 AM
> Subject: Re: [7x12minilathe] Re: lathe table
>
>
>??
>
> I'm just throwing this out there 'cuze I don't know how well it would
> work on MDF, but what about epoxy, like you use on cement floors. It
> would certainly seal and protect it.
>
> On Fri, 14 Oct 2011, mattdbartlett wrote:
>
>> Hmm, MDF is pretty delicate. You might want to think about covering that with something else, like a piece of galvanized, or a sheet of masonite. If you just want to protect from oil (mdf is pretty absorbent), maybe a couple coats of water based polyurethane. That should make the mdf a little tougher if you stick with just the plain mdf.
>>
>> --- In?mailto:7x12minilathe%40yahoogroups.com, george curtis <gcvisalia@...> wrote:
>>>
>>> my bil is gonna put my lathe table together for me. we are wanting to know what
>>> is best to protect the table, mdf, before we put the lathe on.
>>> thanks,
>>>??
>>> george
>>>
>>
>>
>>
>>
>> ------------------------------------
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>
> Vince.
> --?
> Michigan VHF Corp.??
>

Vince.
--?
Michigan VHF Corp.??






Re: Finally, a project!

Jerry Durand
 

On 10/14/2011 10:56 AM, MERTON B BAKER wrote:
Propellant powders have improved drastically since those days. Modern
mortar tubes to not have to contain the explosion, and are made a thin and
light as possible. They serve only the guidance function.
Are you thinking of rocket propelled grenades? Fireworks have a big
ball or cylinder sitting on a bag of black powder, they are NOT rockets
no matter how many reporters call them that. These are mortars in the
old sense, big pipe with a big bang at the bottom blowing a heavy thing
out the other end.


I also make rockets but they're not for public displays (too expensive
and way too dangerous for anything but a closed range in the middle of
nowhere).


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


Re: lathe table

Clint
 

¿ªÔÆÌåÓý

Can I get some details on the solution that you mentioned?? I have an epoxy garage floor that I need to clean.? Normal floor cleaners do not seem to work.
?
Regards,
Clint
?

Sent: Friday, October 14, 2011 10:39 AM
Subject: Re: [7x12minilathe] Re: lathe table
?
?

A mixture of Simple Green and Dawn work great as a cleaner for the epoxy.? If you work in your garage and prone to dropping small parts on the floor, like myself, those little paint chips they provide to help break up the color are your worst enemy.? It is amazing how it helps to hide small parts like scope mounting screws and springs.

-rw
?

From: Vince Vielhaber
To: "7x12minilathe@..." <7x12minilathe@...>
Sent: Friday, October 14, 2011 10:28 AM
Subject: Re: [7x12minilathe] Re: lathe table

?

Well I'm glad I didn't put it on my floor then. I clean alot of oily
things with brake clean and don't always do it over the sink.

On Fri, 14 Oct 2011, Randal Williams wrote:

> The drying time of the epoxy when you roll it on the floor is stated to be 7 days.? I have done three different garages with the stuff.? You can get it to dissolve with carb or brake cleaner if you are not careful.? The recommendation for putting a large aluminum pan under the lathe is excellent.
>
> -rw
>
>
>
> ________________________________
> From: Vince Vielhaber <mailto:vev%40michvhf.com>
> To: mailto:7x12minilathe%40yahoogroups.com
> Sent: Friday, October 14, 2011 9:35 AM
> Subject: Re: [7x12minilathe] Re: lathe table
>
>
>?
>
> I'm just throwing this out there 'cuze I don't know how well it would
> work on MDF, but what about epoxy, like you use on cement floors. It
> would certainly seal and protect it.
>
> On Fri, 14 Oct 2011, mattdbartlett wrote:
>
>> Hmm, MDF is pretty delicate. You might want to think about covering that with something else, like a piece of galvanized, or a sheet of masonite. If you just want to protect from oil (mdf is pretty absorbent), maybe a couple coats of water based polyurethane. That should make the mdf a little tougher if you stick with just the plain mdf.
>>
>> --- In mailto:7x12minilathe%40yahoogroups.com, george curtis wrote:
>>>
>>> my bil is gonna put my lathe table together for me. we are wanting to know what
>>> is best to protect the table, mdf, before we put the lathe on.
>>> thanks,
>>>?
>>> george
>>>
>>
>>
>>
>>
>> ------------------------------------
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>
> Vince.
> --
> Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/
>

Vince.
--
Michigan VHF Corp.



Re: lathe table

 

Here in the UK I bought a can of floor paint marketed by "Rustoleum". A concrete floor which was very dusty. The paint went on very well indeed, two coats and it is wearing very well.

Kind regards,

David Wiseman

Sent from my BlackBerry mobile phone

-----Original Message-----
From: Robert Francis <bobf0648@...>
Sender: 7x12minilathe@...
Date: Fri, 14 Oct 2011 12:54:50
To: <7x12minilathe@...>
Reply-To: 7x12minilathe@...
Cc: Randal Williams<azizavfr@...>
Subject: Re: [7x12minilathe] Re: lathe table

If you want a REAL floor covering, try this. Almost indestructible!






------------------------------------

Yahoo! Groups Links


Re: Finally, a project!

lists
 

In article <ED2FDFD2-062B-4A8B-90D7-4F8551896F10@...>,
John Brookes <haiticare2011@...> wrote:
I just jumped in here. The machining of the brass mortar barrel
interesting. I notice he made a cutting tool from heating and quenching
ordinary CRS. Is this generally possible?
Ordinary CRS won't harden much because it doesn't contain sufficient
carbon. However, as any steel is harder than brass, it will cut.

--
Stuart


Re: Finally, a project!

MERTON B BAKER
 

Propellant powders have improved drastically since those days. Modern
mortar tubes to not have to contain the explosion, and are made a thin and
light as possible. They serve only the guidance function.

Mert

-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of John Brookes
Sent: Friday, October 14, 2011 12:42 PM
To: 7x12minilathe@...
Subject: Re: [7x12minilathe] Re: Finally, a project!


I just jumped in here. The machining of the brass mortar barrel interesting.
I notice he made a cutting tool from heating and quenching ordinary CRS. Is
this generally possible?
Of course, brass is soft, and thats why he can get away with it.
If you were making a mortar with modern materials, wouldn't you just use
steel pipe? In WW2, the military used light weight mortars. How did they
overcome the problem of excessive weight which plagued these CW pieces?
JB



On Oct 14, 2011, at 11:16 AM, ralph_pattersonus wrote:

I think this is the project that was referred to...


--- In 7x12minilathe@..., "MERTON B BAKER" <mertbaker@...>
wrote:

I have a 2" x 24" boring bar, which I used to do the cannons. Still a
reach
on a 12x36, & requires a jig. I had a friend with a 2.5" dia. gun drill
to
ease the labor. Mert


-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of "hanermo" - CNC 6-axis
Designs
Sent: Friday, October 14, 2011 7:51 AM
To: 7x12minilathe@...
Subject: Re: [7x12minilathe] Re: Finally, a project!




Agree 100% with Mert.

I could do it with a 7x - but would not.
It would involve building an external toolrest, and using a linear slide
to control the toolbit.
The linear slide, new, costs more than a 7x.
The work involved would be maybe 100 hours.. by my estimate.

I could do it with my 12x, but might not.
The bore is too deep for easy work.
Ie it IS doable, but far too big/heavy/hard/slow.

I would search for someone who has a 2" thick boring bar, and this is
work
for industrial lathes in the 14x/3000 kg sizes, and above.
For my 12x I have a 1" one, and 1.5" ones are available.
Making one is not impractical, also.

Practical work sizes for a 7x are about 3" in steel, just like any
lathe.
About half of nominal swing.
At a pinch, near nominal is doable, but very slow (everything is
relative.)

Boring that much metal on a big industrial lathe will probably take 3-4
hours.
12" deep means the cuts need to be light, maybe no more than 1 mm DOC or
depth, at a slow feed rate, to avoid excessive chatter.
If the total amount to be removed is say 6" or 140 mm, that means 70
passes at maybe 5 minutes per pass (could be a lot more, especially on
the
later ones where rpm will be about 150).
You did not mention how thick the walls need to be, I guesstimeate at
0.5
inches.
That might be 350 minutes, or almost 6 hours.
Could be more.
Of course, the first 6" depth could be taken at 2-4 mm depths of cut, if
the lathe is a big enough one.

You will likely get your best price from a hobby semicommercial guy, who
will do it for 10-20-30$/hr.
They will take a full day, but wont be in a hurry, and the job might tax
their machines.
An industrial shop is likely to want 60$/hr x 3-4 hrs ..

Let us know how it goes, pics please ..


Rome was no built in a day. I was not the foreman on that job though,
and I
have advice. Keep your 7x12 for a while, buy a few books, (I'm making
a
list, but there are some out there already) Play with your lathe, and
make a
few projects. Find something to make that turns you on, and if it's
too
big
to fit on your 7x lathe build a working model that will. After 60
years
in
this game, I can say that if you are really interested, nothing can
stop
you.

Mert



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Re: lathe table

 

If you want a REAL floor covering, try this. Almost indestructible!