I have seen many many people reference either a rear-mounted cutoff tool, or flipping the cutoff tool upside down and running the lathe in reverse; since your lathe doesn’t run in reverse (iirc), you’ll want to look into a rear-mounted one. ?IN Ted Hansen’s Minilathe book from Home Shop Machinist, he has plans and description on building a rear-mounted on for a mini-lathe that you may be able to modify to work.

But generally, as someone else mentioned, more rigidity is needed.?

On Apr 12, 2021, at 11:53 AM, Ralph Hulslander <rhulslander@...> wrote:

Thanks everyone for the replies, and yes Leo you are doing great.

As I said I was able to part Delrin and aluminium, parting the aluminium looked like a YouTube video of how to part.

It was perfect. But with steel I have problems but I will continue trying and if I really have to part something I do have a which is a fantastic tool.

Ralph

On Mon, Apr 12, 2021 at 1:56 PM mike allen <animal@...> wrote:

??? ??? your doing fine Leo

??? ??? animal

On 4/12/2021 10:54 AM, Leo Kuipers wrote:

Hi Ralph,

?

I also did have many problems with parting on my ATLAS 10200 lathe, after repairing a warped cross slide guiding, replacing the plastic gibs by brass ones, it got the tool in a useful state.

The tool on the picture is what I used. ?

But also it’s crucial to have the parting tool exactly at center height and the angle between parting tool and the part must be between 0 -1 degree.

?

In the old day the parting tool was placed upside down behind the spindle while the lathe was running reverse direction. This mainly was in use the overcome bad bearings of the main axis. (And maybe more)

?

Sorry if I once in a while mess up the English language.

?

Best regards,

Leo

?

From: [email protected] [mailto:[email protected]] On Behalf Of Ralph Hulslander
Sent: maandag 12 april 2021 17:24
To: [email protected]
Subject: Re: [digitalhobbyist] Constant Surface Speed #CSS #LATHES #MODS

?

I have smashed a couple of carbide parting tools, so I stick with HSS for the time being.

?

Ralph

?

On Mon, Apr 12, 2021 at 11:16 AM John Lindo <bechetboat@...> wrote:

Parting off.

These are a nice tool to use, 2 bites of the?cherry?carbide insert and double ended.

I use HSS parting tools thinned down for "o" ring grooves, that?s about?all nowadays.

I have used my insert parting tool for over 3 1/2 years. Expensive to initially buy, but a very reliable tool.

With a good coolant flow, mainly to wash the chips out of the groove, a 2" dia steel parting off is a dream.?

Even more easier since I removed my compound slide and made into a boat anchor. LOL. my tool post?is fixed directly

to a riser block that bolts to the cross slide.?

Thanks RELS, I have no more "compound slide" blues.?

?

John

?

On Mon, 12 Apr 2021 at 16:42, Ralph Hulslander <rhulslander@...> wrote:

I was going to ask about using CSS while parting? So far I can part Delrin (plastic) and aluminium nicely

but have never successfully parted steel. So if CSS would help I'll move it up on the list.

?

Ralph

?

On Mon, Apr 12, 2021 at 9:08 AM CLevinski <clevinski@...> wrote:

On Mon, Apr 12, 2021 at 08:50 AM, Robert Francis wrote:

HOW FOR HUNDREDS OF YEARS< HAVE MACHINISTS MANAGED TO PART ITEMS IN A LATHE????? Answer SKILL!!

Robert,

Absolutely true!

When at a Renaissance Fair in Germany some years ago, I watch an artisan make wooded chess pieces on a lathe powered by a sapling. The tree was bent over and rope ran from the tree around the spindle multiple times, and was the anchored to a foot pedal. Pressing on the foot pedal would turn the spindle and the artisan would take cuts, and then withdraw his tool when the pedal was released and the spindle spun in reverse. This was certainly a skilled individual. But I doubt that woodworkers worldwide would like to surrender their electric motors and plant saplings in their shops!

The CSS is just one more tool.?(Although I view CSS more as a tool for creating larger diameter faced surfaces without "vinyl record grooves" rather than for parting.) It just increases the RPM to keep surface speed constant as the tool is advanced in the X-axis. It does not require that the lathe be otherwise automated. Like all such tools, it does NOT replace skill! Good point!
?
--
Regards,

Charlie
New Jersey, USA

SATTINGER’S LAW: It works better if you plug it in.
EDWARD'S LAW: It works even better if you turn it on.

--
Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill press, 40 watt laser, Consew brushless DC motors and a non working 3D printer

--
John

--
Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill press, 40 watt laser, Consew brushless DC motors and a non working 3D printer

--
Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill press, 40 watt laser, Consew brushless DC motors and a non working 3D printer

--?

Bruce Johnson

"Wherever you go, there you are." B. Banzai, PhD