Jasons tips

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Jason suggested these tips to me recently for use on bronze.

I had roughed out most of the flywheel but waited for these to do the final couple of cuts.

They did the job in a most admirable way.

So. ........... What else are they good for. ........ Talk to me, tell me.?

It's difficult to tell but the video doesn't look like a CCGT insert, more like CCMT? I'd expect the insert to be highly polished and with a distinct rake angle for CCGT. May be it's just that the screen definition isn't adequate. I haven't tried CCGT on bronze, CCMT works fine for me. I use CCGT on aluminium alloys and plastics.

Andrew

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Well it came out of that box that was sealed when I got it.

Nick

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By the looks of that finish, Nick ... you might try making a telescope mirror

... You just need a clever device to generate the parabolic tool-path !

MichaelG.

As Andrew says they do look a bit dull rather than the usual bright finish and not as high a rake at the tip, if you know anyone whao can take a half decent photo maybe they could take a close up of one of the tips. Though I have not used Sandvik ones.

I use them on brass, bronze and ali and sometimes on steel and stainless steel particularly long thin parts as the sharper edge does not push the work away from the tip

Nick

Definately don't look like the usual **GT tips, you also have a larger tip radius than I usually go for. Will take a pic of mine in the morning.

J

Here are examples of my inserts, CCMT on the left and CCGT on the right:

Both inserts are 09 size and 0.4mm nose radius. Manufacturer is Korloy. While details of the chip breaker will change, the basic form will remain the same across manufacturers. Two things to note for the insert on the right - it has a much sharper edge, and the rake angle is greater.

Andrew

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I take your point Andrew.

Looks like an ebay vendor had me over.

Nick

But they still did the job OK. That's a positive (as well as the rake).

Dave
The Emerald Isle

You could look through the Sandvik catalogue to find the best tips for your material........

http://www2.coromant.sandvik.com/coromant/pdf/Metalworking_Products_061/main_a_1.pdf

Ground finish (GT) H13A is the recommended grade for non ferrous materials, especially aluminium, H10A is also a suitable substitute.

Emgee

My lathe can do that if I forget to lock the saddle when taking a facing cut.

Nick have you tried those tips on brass at all?

Ed.

Edited By Ed Duffner on 07/04/2016 05:23:00

Folks, All **GT inserts are not always polished as in Andrews pic, some are coated. I have some from Korloy and ARNO Werkzeuge that are coated [I will post a pic later when time permits ] Although whether coated or uncoated they all share the same high rake angle as shown in the right hand pic from Andrew. Nick_G ,yours certainly look to be CCMT. Because ** GT inserts are usually a bit more expensive than the standard **MT. the seller maybe tried [and maybe Succeeded ] in pulling a fast one. I dunno about that. Best to go through the Sandvik Coromant catalogue and find out. Although they look to be performing ok.

Just been looking through the Sandvik Coromant catalogue and Nicks inserts are indeed CCGT So the Ebay seller had described them correctly.

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Thanks for that info Raymond.

The pack of 10 was sealed so someone would then have had to make a false label and reseal them. - Strange though that they differ so much from the normal ones.

If I get chance later I will try them on some brass and aluminium and report back here.

Cheers, Nick

I have the Hard copy here, [all me cats are hard copies, as I hate reading too long off a screen ] and they are on page 11 of the Small part machining section. Would think the download cat would be the same.

Cheers.

Edited By Raymond Anderson on 07/04/2016 09:59:22

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Would like to think that ^^^ but can't tell

The PDF only covers the first few pages ... then on p9

If you want to view the next page please click HERE!

... but [at least on my iPad] the word HERE! is not hyperlinked.

Edited By Michael Gilligan on 07/04/2016 10:37:11

Hi Michael, Just tried the e catalogue, and it does indeed differ from the hard copy. The tips are under Coroturn107 on page A292/293 /145 of the general turning section. Not easy to navigate to. Another reason I prefer hard copies.

My expectation is that they will work fine on brass, but less so on aluminium, the two possible issues being BUE and chip breaking.

Andrew