Hi John, ? Thanks for your reply, I have messed up the rotation direction. ? Best regards, Leo Kuipers. ? ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of John Lindo
Sent: dinsdag 13 april 2021 05:29
To: [email protected]
Subject: Re: [digitalhobbyist] Constant Surface Speed #CSS #LATHES #MODS ? I agree with the need for an accurate parting tool?height set up.? Understand your rear tool post position preference, splash guard side of the spindle, but if the parting tool blade is upside down. then the spindle should be running in a normal direction IE anti clockwise to cut. The saddle needs to be locked down with the?saddle?clamp else it will lift off the?bedway. This option of upside down is popular on capstan and or CNC lathes, as it allows the chips to fall off the tool and not curl up on the top rake and trap. Most CNC lathes with multi indexing tooling turrets run the tooling from the slash guard side of the spindle with tools upside down.? Unfortunately I have only a 7 x mini lathe and do not have sufficient space to secure a tool post splash guard side of the cross slide parting off 30 mm dia bar stock? I might? get away with a max dia of 20 mm, but the removal of the compound slide and the tool post basically bolted to the cross slide has gained rigidity so the normal approach of feeding in from the operator side is OK at this moment. ? On Mon, 12 Apr 2021 at 19:54, Leo Kuipers <leo.abo@...> 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. ? 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.? ? 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. ? 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
--
John
|
