Holders to use the obtuse corners of C* inserts.

[Robin GrahamParticipant @robingraham42208]

[Robin GrahamParticipant @robingraham42208]

I have quite a few CCMT/CCGT inserts which are worn or chipped on the 80 degree corners but pristine on the 100 degree. I can't find holders to use the 100 degree corners though – probably not using the right search terms. They must exist!

Can anyone advise?

Robin.

[Paul LousickParticipant @paullousick59116]

I have seen them but only on DIY forums. You may have to make your own.

Paul

[David ColwillParticipant @davidcolwill19261]

Hi,

Here is a link to APT Link

If you google the tool code (SCBCRxxxx) you may find them on eBay.

David.

Edited By David Colwill on 29/04/2021 05:54:49

[DiogenesIIParticipant @diogenesii]

UK made and cheap..

JB Tools

[JasonBModerator @jasonb]

You can also get SClCL which is the left hand one for facing, I got both L & R from JB Tools.

Edited By JasonB on 29/04/2021 06:55:32

[David George 1Participant @davidgeorge1]

I have one from JB tools l can turn and face with same tool holder.

David

[robjon44Participant @robjon44]

Back in the day we campaigned 80 degree rhombic turning tools using 12 16 & 19mm tips, we also had holders to use up the obtuse angled corners as well, these murdered things like square or other irregular shaped components in both steel & cast iron & saved the company vast amounts of money! If you are as tight fisted as I am it is perfectly feasible to make your own, don't ask me how I know, set out from positive rake tips in the home workshop.

BobH

[Clive FosterParticipant @clivefoster55965]

i have a Sandvick branded one that I regularily forget to use so the pile of inserts with good 80° corners just keeps piling up.

Rhombic inserts do a decent job at both turning and facing when the tool is set at 90° to the bed that its so convenient not to bother changing. Especially as being a mostly HSS guyI don't use "that" many inserts. Averages out about 2 or 3 a year so the bargain stash of 6 Sandvick boxes bought "mumble-mumble" years ago is lasting well.

Clive

Edited By Clive Foster on 29/04/2021 08:51:25

[Niels AbildgaardParticipant @nielsabildgaard33719]

An old describtion of a homemade,ultra-rigid

Toolingship

[Andrew TinsleyParticipant @andrewtinsley63637]

I had exactly the same problem and I was guided towards Jenny Blackwell of JB Tools. She has exactly what you want at the right price and I believe they are made in the UK.

Andrew.

[Bo’sunParticipant @bosun58570]

Another vote for JB tools

[jacques maurelParticipant @jacquesmaurel42310]

Hello

I've sent a detailed article to Neil (MEW editor) on how to machine these tip holders and others, just wait for the publication.

JM

[Howard LewisParticipant @howardlewis46836]

Greenwood Tools used to sell such holders so that the 100 degree corners could be used. They are shutting down, so be quick and take a look, if Jenny Blackwell can't help you.

I use mine for roughing, but they give a good finish anyway.

Howard

Edited By Howard Lewis on 29/04/2021 12:25:14

[DanielParticipant @daniel]

I

JB Cutting Tools

[Robin GrahamParticipant @robingraham42208]

Thanks all – just what I needed. I have bought inserts from JB (and had excellent service), but didn't think to look there. An order will be winging its way to JB.

Niels – thanks for the link to your ultra-rigid holder. That looks good. Apart from your holder, the thread is informative in general about the use of carbide tooling in a home workshop.

It's sad to hear that Greenwood is closing. I have a KIT-Q-CUT parting tool which I bought from them years ago at a show (remember shows?). It's a wonderful tool – zips its way though pretty much anything.

Robin.

[Niels AbildgaardParticipant @nielsabildgaard33719]

Hello Graham

Thank You for kind words.

There are pictures of Your lathe in album.

What is size of lathe and can I have a picture of the headstock with internals?

And spindle bearing numbers?

I am interested as the screwcutting geartrain seems to be the same as in my future (and latest. I swear) dream lathe.

Chineese of course and a 38mm bore for 1000$ called CJ0625.

The same gentleman explain carbide part off tooling (and I hijack the thread here)

Step parting

Edited By Niels Abildgaard on 30/04/2021 09:15:08

[Robin GrahamParticipant @robingraham42208]

Hi Neils. My lathe is of the generic Chinese 12×36 design – there are many variations, but the particular variant I have came from Axminster Tools. You can find a manual which gives some info about the headstock / screwcutting gearbox internals here . In the US Grizzly used to sell a very similar machine, marketed as a gunsmith's lathe – the (rather more detailed) manual for their variant can be found here . The Grizzly headstock spindle and gearbox arrangements appear to be identical to those in my machine, but the threading / power feed box is somewhat different.

[Edit] I had a quick look and it seems the CJ0625 – if that's the one you're looking at- is an entirely different animal, so the above might not be of much use!

If I can help further it might be better to continue discussion by private message, as its a bit off-topic here.

Thanks for the link to the discussion of carbide parting tools on HMEM. Your step parting technique is interesting – as well as the Greenwood tool (which uses 2.2mm Sandvik Coromant inserts I think) I have an ARC tool which uses 3mm GTN inserts, so it could be a useful method for me in some circumstances.

Robin.

 

 

Edited By Robin Graham on 30/04/2021 23:11:42

Edited By Robin Graham on 30/04/2021 23:15:04

Edited By Robin Graham on 30/04/2021 23:18:17

[Niels AbildgaardParticipant @nielsabildgaard33719]

Hello Robin and thank You for links.

Exactly what I wanted to look at.

The CJ0625 is a very different animal but the procedure described in the Grizzly manual of Yours is universal for adjusting spindle bearings and has been bookmarked.

Niels

[Ian HewsonParticipant @ianhewson99641]

Another thumbs up for JB tools, great service from Jenny and some spare tips thrown in free gratis.
first time I have used them, but not the last.

ian

[egaParticipant @ega]

The Glanze holders I bought from Axminster came with this card:

SCBCR and SCKCR use the 100 deg corner.

[Author]

Posts