How should I make this?

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How should I make this? Ian 03-29-2008
Posted by Richard Edwards on March 30, 2008, 1:23 am
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 On Sun, 30 Mar 2008 05:34:47 +0100, Richard Edwards

Oops. Just looked at my post, mandrel should really look like this -
(View in fixed font)

R S T U

111111111111111111111111111111111111 111
1 1 1
11 1 1
1 1 1
Drill 10 1 1 1 Tap 10
1 1 1
11 1 1
1 1 1
111111111111111111111111111111111111 111




--

Richard

Email address is valid but remove burrs before sending!

Posted by Dave Baker on March 30, 2008, 7:51 am
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>
>>I need to make several 'Top Hats' out of stainless steel, below is a sort
>>of
>>cross section in my first attempt at ascii art.
> A
> llllllll
> llllllll B
> lllllllllllllllllllllllllllllllllllllllllllllllll
> llll
> llll
> D llll C
> llll
> llll
> lllllllllllllllllllllllllllllllllllllllllllllllll
> llllllll
> llllllll
>
> Whilst I like Dave Bakers option it seems to ignore bore "C"

The part is described as a "top hat" so one would assume it doesn't have a
bore C and isn't meant to be viewed in fixed font.
--
Dave Baker
Puma Race Engines



Posted by Richard Edwards on March 30, 2008, 8:04 am
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wrote:

>
>>
>>>I need to make several 'Top Hats' out of stainless steel, below is a sort
>>>of
>>>cross section in my first attempt at ascii art.
>> A
>> llllllll
>> llllllll B
>> lllllllllllllllllllllllllllllllllllllllllllllllll
>> llll
>> llll
>> D llll C
>> llll
>> llll
>> lllllllllllllllllllllllllllllllllllllllllllllllll
>> llllllll
>> llllllll
>>
>> Whilst I like Dave Bakers option it seems to ignore bore "C"
>
>The part is described as a "top hat" so one would assume it doesn't have a
>bore C and isn't meant to be viewed in fixed font.

There you go, my error. I must admit I always assume ASCI art is based
upon fixed pitch font, and my reader is setup this way because of
problems in the past, however incorrect in this case.

I therefore like your option even more! <G>
The "O" ring option that I described is useful though. ;-)


--

Richard

Email address is valid but remove burrs before sending!

Posted by Nourish on March 30, 2008, 4:03 am
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Use a Fixed Steady to hold the 50mm diameter stock.


--
Nourish
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Posted by lemel_man on March 30, 2008, 6:26 am
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Ian wrote:
> ... snip
>
> I have thought of making an expanding mandrel which is somehow activated
> through the headstock spindle but it seems overcomplicated
>
>
> Thanks in advance for any suggestions
>
> Ian Phillips
>
>
> ... snip

Here's a really simple design for an expanding mandrel.
You will need a suitably sized socket head cap screw and a nice long
socket key - one that will reach the mandrel from the outside end of the
headstock spindle. A piece of hex-rod and a spanner would do the job. A
1st-taper tap and tapping drill to match the screw.
Make the mandrel out of any suitable material you have, slightly
oversize, and drill a hole right through with the tapping drill. Tap a
thread from the headstock end of the mandrel until the end of the tap
protrudes a little from the mandrel - this ensures that the thread is
not cut to full depth at the end.
Make two axial saw cuts in the end of the mandrel, at right angles to
each other Insert the screw finger tight, put the mandrel in the lathe
chuck and skim it to final size, and the job is essentially finished.
The following link should make it all clear.
http://tinyurl.com/2lf2tq
Put the workpiece on the mandrel and tighten the screw from within the
lathe spindle, which will expand the mandrel because of the tapered
thread and grip the workpiece securely.

You could, of course, use a long threaded bar instead of a socket screw
and long key.

--
Regards, Gary Wooding
(To reply by email, change feet to foot in my address)

--
Posted via a free Usenet account from http://www.teranews.com


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