Parting Tools

[Chris Evans 6Participant @chrisevans6]

I am well on with making a new Cross slide for my 14" x 40" Excel lathe, all beefed up to add tee slots and tapped holes on the surface.

My thoughts are now moving ahead to making a rear tool post for a parting tool. What is the preferred size of parting tips ? 2.2mm or 3mm ? Chris.

[Chris Evans 6Participant @chrisevans6]

[JasonBModerator @jasonb]

All depends on the job in hand, for small stuff upto 1/2" dia or so I will either use a 1mm indexable tool or a 1.5mm HSS one. No need for more width and it gets wastefull on brass and bronze fittings.

On larger stuff either a 3/32HSS or 2.2mm tipped tool, with a lathe that size you will have the power to drive a 3.2mm tip and the added sideways stiffness of the thicker carrier helps when widening slots or doing interupted cuts.

I have 4 tool holders with the above mentioned tools and use whats right for the job, no one tool will do it all.

[AjohnwParticipant @ajohnw51620]

Where did you get the 1mm indexable tool from Jason ? I haven't seen one that thin and like you I prefer to go as narrow as possible.

RDG do one that they state 2mm blade but it's more like 1.6mm and the tip is 3mm. This one has a 12mm shanks and overhangs the blade so will fit in ordinary qctp – dixon types anyway.

I couldn't find any 1.5mm hss blades either in the UK so had to get them from Ebay USA.

John

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Edited By Ajohnw on 16/04/2016 11:56:25

[JasonBModerator @jasonb]

Ketan now does a 1.5mm blade but his holder is a better design that the ones that have been easily available for a number of years from the likes of Chronos and RDG. I will be getting one of thse holders when I next order.

1.5mm one in action on some cylinder fins

Again there are several makers of the small parting/grooving systems I use the "Minithin" which is available from MSC here in the UK. I have a few inserts for it, flat bottom grooving, right and left parting and also the round bottom one. They are also very good for circlip and e-clip grooves which is what I originally bought it for. Page 593 & 594 they are usually in teh monthly discount flyer.

1.0mm tip being used for piston ring grooves

0.7mm wide e-clip grooves for 0.6mm wide clips in stainless valves and silversteel pivot pins

[Chris Evans 6Participant @chrisevans6]

MSC are only 20 miles from me, looks like I will call and look at 2mm stuff to start with. I am on the mailing list for the flyer. What I am trying to avoid is buying a system that uses a difficult to get tip. I used " Horn " parting and grooving stuff when at work but a bit pricey for home use.

[JasonBModerator @jasonb]

There is a test of ARCs indexables in 241 which should be out in a day or so

[Nick_GParticipant @nick_g]

Posted by JasonB on 16/04/2016 13:30:53:

.

I like the rollers on the arms where they meet the valve stems Jason.

I may mod the Hoglet design (again) to incorporate those.

Nick

[AjohnwParticipant @ajohnw51620]

Good to see Ketan has some decent grade HSS parting off blades. Not my favourite though which is 1/2" x 1/16". That's what I had to get from the States. There used to be plenty about. Now it all seems to be 2mm.- 3/32 Think the USA ones are actually 1.5mm.

The RDG holder is for 25mm blades that take an insert. I thought that as is the case the blade and tip aren't what I really wanted I'd get a blade and tips from some where else along with tips of a specified size.

Circa £15 for thin grooving I assume is for ONE TIP !!!!!!!!!!!!!!! Looks like it would be fairly easy to make holders. More so than the APT ones which only go down to 2mm. I like tips that come sub £30 for 10.

John

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Edited By Ajohnw on 16/04/2016 15:01:06

[KWILParticipant @kwil]

Nick,

"Rollers" are small ball races

[Nick_GParticipant @nick_g]

Posted by KWIL on 16/04/2016 15:42:20:

Nick,

"Rollers" are small ball races

.

No they ain't.!!

They were a bunch of Scottish lads in the 70's that wore their pants too short and had tartan on the hems. They combined this with crap 'music and dippy girls that went ga-ga over them.

But my terminology was 'Americanised' meaning i.e. roller bearings.

Nick

[AjohnwParticipant @ajohnw51620]

All bearing roll Nick.

John

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[VicParticipant @vic]

I like the T shape parting blades.

**LINK**

[D.A.GodleyParticipant @d-a-godley]

+1 with Vic, that Chronos parting tooling is superb ! , I have the insert type also , but it is definitely inferior and I am so happy to have bought the 100mm M35 which performs faultlessly .

[AjohnwParticipant @ajohnw51620]

I think you will find that they can be bought more cheaply on ebay and 1/2" x 1/16 as well.

John

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[JonParticipant @jon]

Depends what diameters your working with there are too many different designs to list and each have their own speciality.

Judging by size of lathe normal parting min 2.18mm width tipped, large diameters 3mm or 1/8" the type can slide through a block.

Smallest I have is 1/16" wide decent HSS cobalt not the Chinese rubbish, it sonly used for cutting o ring grooves.
Favourite 2.18mm Iscar DGTR with DGN2202J Neutral tips or DGN2202J-6D Right cut. I turn with these because idle and no flex.

Large diameters the feed through block type.
Teutec TGB 32-3 tips?
Seco ? cant see writing on inside block but uses LOMR 160302SN 3mm thick.
Have parted 7" dia aluminium 6082 without much trouble an if can part aluminium 6082 you will part anything.

Must get round to a few Mini thin to replace the hss that just veer off and or lock up and grab.

[JonParticipant @jon]

J&L are about 11 mile from me I only buy whats on offer and whats on offer can often be found cheaper else where.

Chris where abouts are you if local ish can try a few of mine to see what works. Have thrown out several parting and tools had to use over the years, theres no substitute for quality tooling been there done it and money down the pan.

Wholly impressed by Horne also one of my favourite boring/interpolating/grooving tools, worth its weight in gold even if the tips are £30+ each.

[SandgrounderParticipant @sandgrounder]

Posted by Vic on 16/04/2016 16:41:44:

I like the T shape parting blades.

**LINK**

Just been looking at the Chronos website and the photos of these show them as as they would be used on a front toolholder, has anyone used them on a Myford S7 rear toolpost, will the heights etc be OK?

Thanks

John

[Chris Evans 6Participant @chrisevans6]

Jon. I am in Kings Bromley in between Lichfield and Burton on Trent. I use an old Jones and Shipman HSS blade tool at the moment. The cross slide issues I am attempting to overcome should Improve my parting off !

When the lathe goes back together it will have a new feed screw and nut so backlash should be minimal, as well as improved slideway fit.

[VicParticipant @vic]

Posted by John Caines on 17/04/2016 07:52:49:

Posted by Vic on 16/04/2016 16:41:44:

I like the T shape parting blades.

**LINK**

Just been looking at the Chronos website and the photos of these show them as as they would be used on a front toolholder, has anyone used them on a Myford S7 rear toolpost, will the heights etc be OK?

Thanks

John

If you want to use on a rear toolpost you'd be better off with this.

**LINK**

[mark smith 20Participant @marksmith20]

I just use the emco tool holder that came with my lathe and it appears to work fine with just HSS bits ,i did grind a left hand one from a HSS bar and that works fine.

Edited By mark smith 20 on 17/04/2016 11:15:38

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