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Hi,

Just joined the list, and introducing myself. I'm an electronics hobbyist
that's looking into making a product that will need small enclosures and so
far I'm looking into buying the tools and doing this myself. One option is
to turn and thread alum rod/tube and hence I found this list. I know next
to nothing about metal machining, so the actual processes are undecided, and
hence so are the tools. Looking forward to learning a bunch.

Cheers,
-Neil.

It's known as "spherical turning," although, you're more
interested in radius turning. The two basic approaches are to
generate the radius with some type of pivoting toolholder or to trace
an existing radius with some type of sliding toolholder. Here are
some methods:




(scroll down to the profile attachment section)

Roy
--- In 7x12minilathe@..., "evill914 <evill914@c...>"
<evill914@c...> wrote:

I'm a beginer with my lathe. I have been practicing facing, turning
and boring with good results.

My question is, how do you create a cure on a work piece. I want to
make dies for an air planishing hammer. The radius would be cut on

the

face side. That is, instead of creating a flat face, which I can now
do, how do I create a small dome on the end. I want to create domes
that are almost flat to moderately curved.

Any tips and advice are greatly appreciated.

thanks,
Ed

I'm a beginer with my lathe. I have been practicing facing, turning
and boring with good results.

My question is, how do you create a cure on a work piece. I want to
make dies for an air planishing hammer. The radius would be cut on the
face side. That is, instead of creating a flat face, which I can now
do, how do I create a small dome on the end. I want to create domes
that are almost flat to moderately curved.

Any tips and advice are greatly appreciated.

thanks,
Ed

I didn't know the RHD name for them, or if they were readily
available (read, "cheap") in the UK.
As usual, the snipes save the day :-)

Roy
--- In 7x12minilathe@..., "Capt Ken Appleby
<captkenn@m...>" <captkenn@m...> wrote:

Hi JimE & Roy et al,
I tried the method of reverse clamping on the chuck suggested by

JimE

but it didn't work for me.

However, would you believe it Roy, I have three different sizes of
exhaust expanders in my garage workshop - including one of 1 and

5/8"

to 2 and 1/4" from my Race Car building days. I guess I am not
thinking laterally enough for the mini-lathe yet - which must mark

me

out still as a "Decky" (:o)

HAPPY NEW YEAR from dark and wet Northumberland
Regards
Ken

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

For a low-budget expanding mandrel, an automotive "tailpipe
expander" can be held in a chuck. They're not as accurate as
a "real" expanding mandrel, but, can be fiddled into position for
trueing the ends of tubing.

Roy
--- In 7x12minilathe@..., "Capt Ken Appleby
<captkenn@m...>" <captkenn@m...> wrote:

Hi,
I have come across a problem. What is the best way to put a 2"x

8"

Brass tube in the mini-lathe. I find that using neither the 4-

Jaw

nor

the 3-Jaw allows it to grip sufficiently. It seems to be a sort
of 'Blind Spot'.

I want to machine both ends but to make a mandrel that size

seems

a

bit OTT.

Any ideas?
Regards
Ken

Hi JimE & Roy et al,
I tried the method of reverse clamping on the chuck suggested by JimE
but it didn't work for me.

However, would you believe it Roy, I have three different sizes of
exhaust expanders in my garage workshop - including one of 1 and 5/8"
to 2 and 1/4" from my Race Car building days. I guess I am not
thinking laterally enough for the mini-lathe yet - which must mark me
out still as a "Decky" (:o)

HAPPY NEW YEAR from dark and wet Northumberland
Regards
Ken

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

For a low-budget expanding mandrel, an automotive "tailpipe
expander" can be held in a chuck. They're not as accurate as
a "real" expanding mandrel, but, can be fiddled into position for
trueing the ends of tubing.

Roy
--- In 7x12minilathe@..., "Capt Ken Appleby
<captkenn@m...>" <captkenn@m...> wrote:

Hi,
I have come across a problem. What is the best way to put a 2"x

8"

Brass tube in the mini-lathe. I find that using neither the 4-Jaw

nor

the 3-Jaw allows it to grip sufficiently. It seems to be a sort
of 'Blind Spot'.

I want to machine both ends but to make a mandrel that size seems

a

bit OTT.

Any ideas?
Regards
Ken

For a low-budget expanding mandrel, an automotive "tailpipe
expander" can be held in a chuck. They're not as accurate as
a "real" expanding mandrel, but, can be fiddled into position for
trueing the ends of tubing.

Roy
--- In 7x12minilathe@..., "Capt Ken Appleby
<captkenn@m...>" <captkenn@m...> wrote:

Hi,
I have come across a problem. What is the best way to put a 2"x 8"
Brass tube in the mini-lathe. I find that using neither the 4-Jaw

nor

the 3-Jaw allows it to grip sufficiently. It seems to be a sort
of 'Blind Spot'.

I want to machine both ends but to make a mandrel that size seems a
bit OTT.

Any ideas?
Regards
Ken

Hi Mike,
Mmmm I hadn't thought of wood! That makes good sense I will give it a try
tomorrow

Regards
Ken
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&#92; &#92;

From: "walsh2002bc <me.walsh@...>" <me.walsh@...>
Reply-To: 7x12minilathe@...
To: 7x12minilathe@...
Subject: [7x12minilathe] Re: Chucking medium diameter tube in Mini lathe
Date: Mon, 30 Dec 2002 22:02:30 -0000

_________________________________________________________________
The new MSN 8: smart spam protection and 3 months FREE*.




[Non-text portions of this message have been removed]

--- In 7x12minilathe@..., "Capt Ken Appleby
<captkenn@m...>" <captkenn@m...> wrote:

Hi,
I have come across a problem. What is the best way to put a 2"x 8"
Brass tube in the mini-lathe. I find that using neither the 4-Jaw

nor

the 3-Jaw allows it to grip sufficiently. It seems to be a sort
of 'Blind Spot'.

I want to machine both ends but to make a mandrel that size seems a
bit OTT.

Any ideas?
Regards
Ken

Large tubing always seems to flex it's way out of the jaws. How
about a tapered hardwood plug, center drilled and used with the live
center?

Recently I saw plans for a large aluminum live center special made
for large tubing that would be perfect.

Mike

I've chucked a 2" ID piece using the outside of the regular jaws of the
standard 3-jaw chuck. Just remember to turn the handle backwards to
tighten ...@;-)

Graciously,
Jim
Lakewood, CA
All Hail Rube Goldberg!

"Capt Ken Appleby " wrote:

Hi,
I have come across a problem. What is the best way to put a 2"x 8"
Brass tube in the mini-lathe. I find that using neither the 4-Jaw nor
the 3-Jaw allows it to grip sufficiently. It seems to be a sort
of 'Blind Spot'.

I want to machine both ends but to make a mandrel that size seems a
bit OTT.

Any ideas?
Regards
Ken

sorry mike i got your name mixed up with another e-mail i was doing at the
same time!!!


BEST WISHES FOR 2003

DAVID WILLIAMS
BOLTON
ENGLAND

www.smartgroups.com/groups/pre78bmw

the chester cobra is the same as the SEIG X1. chester even use the seig
picture from their website,price is 茂驴陆339 as opposed to 茂驴陆499 at warco. have
you bought a micro mill steve? you could always pop over for a brew, i live
in astley bridge.



BEST WISHES FOR 2003

DAVID WILLIAMS
BOLTON
ENGLAND

www.smartgroups.com/groups/pre78bmw

I have bought several machines from Chester, David and also found the machines as supplied
were useless. They all needed stripping and rebuilding.

The service from Chester was abysmal.

They are just box shifters, like Warco.

The Cobra is not identical to the Taig/Peatol.

BR

Mike Ousby, in Blackburn not far from either Keighley or Bolton

Chester ignored my emails!

--- In 7x12minilathe@..., "david" <davidalan@l...> wrote:

have you tried ringing the spares line at machine mart? i have had

stuff

from them and had excellent service. chester u.k say that if you

need a part

and they do not stock it, they will take it off a machine for you



BEST WISHES FOR 2003

DAVID WILLIAMS
BOLTON
ENGLAND

www.smartgroups.com/groups/pre78bmw

Hi David
Yes It was Machine Mart who said they couldn't supply drive belts
until Jan/Feb. I got some items from them but out of ten items three
were 'not in stock or due'
Regards
Ken

--- In 7x12minilathe@..., "david" <davidalan@l...> wrote:

have you tried ringing the spares line at machine mart? i have had

stuff

from them and had excellent service. chester u.k say that if you

need a part

and they do not stock it, they will take it off a machine for you



BEST WISHES FOR 2003

DAVID WILLIAMS
BOLTON
ENGLAND

www.smartgroups.com/groups/pre78bmw

if you are cosidering a mini lathe can i give you some advice? i bought a
chester conquest and out of the box it looked good. however when i got it up
and running it was a horror story. none of the slides was adjusted and it
ran rough.

i rang chester several times and was given plenty of help from a great
salesman called gareth.in the end i stripped it completely and started
again. the lathe would not have run long in that condition. there was no
grease in the headstock at all, everything was dry. i adjusted all the
slides etc after giving them a good greasing . the motor was out of line and
the belt was slack.the 2 large adjusting strips under the slide were split
and would not clamp. once i had spent a week of spare time sorting it out i
now have a good little lathe.

i spoke to gareth recently and he assures me that all lathes are now
stripped and checked before despatch. if you are able, then go and pick it
up from chester yourself and have a look before you buy. if not telephone
first or better e-mail and get them to tell you it has been checked over

i am thinking of buying a cobra micro mill from them, but i will ask plenty
of searching questions before buying. i am not running down their products,
just be prepared to do a bit of work before you use it

P.S. WHERE DO YOU LIVE?


BEST WISHES FOR 2003

DAVID WILLIAMS
BOLTON
ENGLAND

www.smartgroups.com/groups/pre78bmw

have you tried ringing the spares line at machine mart? i have had stuff
from them and had excellent service. chester u.k say that if you need a part
and they do not stock it, they will take it off a machine for you



BEST WISHES FOR 2003

DAVID WILLIAMS
BOLTON
ENGLAND

www.smartgroups.com/groups/pre78bmw

Hi David,
Yes, I buy (and sell) a lot of stuff particularly to and from the
States - at least weekly - and have no problems whatsoever when the
goods are sent declared as 'replaced under warranty' etc, as they
(the Customs) don't bother with it. Put 'machine tools' and a value
and they attack with all guns firing. However the supplier said it
would "affect his ability to export". I can't see how, as I would
have got a lot more stuff for my lathe, and maybe my friends too.
Perhaps he is a part time "Customs Man"
HAPPY NEW YEAR!
Regards
Ken

--- In 7x12minilathe@..., "david" <davidalan@l...> wrote:

<<<<<<<<<<<. Today I got a letter
saying it would be February... So I am importing a couple of

them.>>>>>>>>>>

i think if the goods are valued at less than 拢18 then they do not

collect

tax on items as it is not worth it. i bought a vintage model

aircraft engine

from the states and the chap stripped it down and sent it accross

as old

model engine parts/obsolete. i then rebuilt it and it runs like a

swiss

watch!!



BEST WISHES FOR 2003

DAVID WILLIAMS
BOLTON
ENGLAND

www.smartgroups.com/groups/pre78bmw

Thanks for that advice.

Looks like a day out in Chester before I buy. I am over the Pennines from you
near Keighley.

<<<<<<<<<<<. Today I got a letter
saying it would be February... So I am importing a couple of them.>>>>>>>>>>

i think if the goods are valued at less than 茂驴陆18 then they do not collect
tax on items as it is not worth it. i bought a vintage model aircraft engine
from the states and the chap stripped it down and sent it accross as old
model engine parts/obsolete. i then rebuilt it and it runs like a swiss
watch!!



BEST WISHES FOR 2003

DAVID WILLIAMS
BOLTON
ENGLAND

www.smartgroups.com/groups/pre78bmw