RE: [PSUBS-MAILIST] Lathe Problems

["Hugh Fulton" <hc.fulton@gmail.com>]

Hi James,
I used to own a couple of machine shops and to use a light machine tool like
you have requires knowing some of the tricks of the trade.  As a couple of
people have suggested tool height and tool rake are pretty important when
you have low machine stability but surface finish is usually surface speed
related. Common faults are machining at too slow a speed.  The advice
someone gave you earlier on checking speeds cannot be underestimated. It is
very easy to work harden stainless steel so you need to go to a
knowledgeable person where you can buy lathe cutting tools and describe to
them the job you are doing, take a drawing, and they can recommend surface
speeds and tip geometries suitable for the job. Sandvik, Iscar and Seco are
a good start for turning tools. These guys have giveaway tables that are a
great help as well. Otherwise you could end up with some heartache where you
stuff up the part when almost finished.  Without knowing what you are making
the guys on the forum cant really help you other than with the odd tip.  My
suggestion is to buy a bigger, better quality second hand lathe, get a
selection of lathe tools and tips and spend some time doing a few different
shapes etc before you tackle anything critical. 
Best of luck,
Hugh
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of
james@guernseysubmarine.com
Sent: 27 March 2008 00:43
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Lathe Problems

Hello

Thanks for that.  I'll give it a try.  What speed did you have the machine
set on to cut the 304?

Thanks
James

> I also have a light weight lathe with a babbet head stock, what i found to

> work for me was to cut the tool bit with a high rake about 35' this
allowed me  
> to make .050 deep cuts in 304 ss with good results also the tooling was
set  
> slitely above the c/l   try it and see if it works for you
 
 
In a message dated 3/25/2008 12:04:51 P.M. Eastern Daylight Time,  
james@guernseysubmarine.com writes:

Hey  Frank.

> I don't know anything about machining, but that's a great  job on building

a  
> web site. Frank D.

Thanks!   Unfortunately it takes over half an hour to update it now as i
have 
to  recompile the whole thing and upload it all.  Luckily i can do it while

im at work ;)

Right, im off to try Dan and Jims ideas for the  lathe.

James

----- Original Message -----
From:  ShellyDalg@aol.com [mailto:ShellyDalg@aol.com]
To:  personal_submersibles@psubs.org
Sent: Tue, 25 Mar 2008 10:37:46  EDT
Subject: Re: [PSUBS-MAILIST] Lathe Problems


In a message  dated 3/25/2008 3:29:19 A.M. Pacific Daylight Time,   
james@guernseysubmarine.com  writes:

http://guernseysubmarine.wordpress.com/


I don't know  anything about machining, but that's a great job on building a

web  site. Frank D.



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