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Holders to use the obtuse corners of C* inserts.

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Robin Graham29/04/2021 01:17:06
835 forum posts
233 photos

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?


Paul Lousick29/04/2021 03:05:11
1755 forum posts
637 photos

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


David Colwill29/04/2021 05:52:52
748 forum posts
38 photos


Here is a link to APT Link

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


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

DiogenesII29/04/2021 06:41:16
238 forum posts
116 photos

UK made and cheap..

JB Tools

JasonB29/04/2021 06:54:22
20637 forum posts
2296 photos
1 articles

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 129/04/2021 07:24:25
1572 forum posts
482 photos

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


robjon4429/04/2021 08:29:54
142 forum posts

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.


Clive Foster29/04/2021 08:51:05
2699 forum posts
96 photos

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.


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

Niels Abildgaard29/04/2021 08:55:19
395 forum posts
148 photos

An old describtion of a homemade,ultra-rigid


Andrew Tinsley29/04/2021 09:27:16
1418 forum posts

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.


Bo'sun29/04/2021 09:50:39
444 forum posts

Another vote for JB tools

jacques maurel29/04/2021 10:32:32
77 forum posts
18 photos


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


Howard Lewis29/04/2021 12:24:26
4866 forum posts
12 photos

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.


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

Daniel29/04/2021 15:22:05
337 forum posts
48 photos



JB Cutting Tools

Robin Graham29/04/2021 23:32:15
835 forum posts
233 photos

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.


Niels Abildgaard30/04/2021 09:14:18
395 forum posts
148 photos

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 Graham30/04/2021 23:10:37
835 forum posts
233 photos

Hi Neils. My lathe is of the generic Chinese 12x36 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.




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 Abildgaard01/05/2021 03:49:56
395 forum posts
148 photos

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.


Ian Hewson02/05/2021 15:07:08
295 forum posts
25 photos

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.


ega07/05/2021 12:04:30
2140 forum posts
176 photos

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


SCBCR and SCKCR use the 100 deg corner.

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