开云体育

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

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:

--- 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

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

Regards
Ken
/ /
/,,/,,,,,,,,,,,,,,,,,,,,,,,,,,,,,||
触&濒迟;触):辞)=触&驳迟;抖抖触..触.................
&#92; &#92;'''''''''''''''''''''''''''''||
&#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]

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

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