Author Topic: ccmt inserts  (Read 6156 times)

Offline Darren

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ccmt inserts
« on: March 21, 2009, 05:28:22 AM »
I tend to use CCMT inserts in 06 size,

I only have one tool holder and I'm looking at getting a couple more. What, if any is the advantage of larger sizes, i.e 09 or 12.

Thanks
Darren
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Offline sbwhart

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Re: ccmt inserts
« Reply #1 on: March 21, 2009, 06:49:44 AM »
Darren

It depends on the size of your machine and what you intend to use it for. The bigger the tip the bigger the cut but it won't be much use if your machine hasn't got the grunt to take it. Are you planning to make small engine or something a bit more substantial ?.  If you can I'd try to build up a range of sizes and shapes to cover all eventuality.

Keep in mind a big machine can make something small.  :headbang:

When you get into the science of tip selection it can be a bit of a mine field there's all sorts out there with companies claiming there product is the best thing since slice bread.

Hope this helps
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Stew
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Offline Darren

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Re: ccmt inserts
« Reply #2 on: March 21, 2009, 06:57:30 AM »

 Are you planning to make small engine or something a bit more substantial ?. 

No, nothing like that Stew, though you never know what the future holds.

It's to do with buying tips. Searching ebay you often see 09 or 12 size selling at very low prices, but rarely 06 size...

I was just thinking about widening my options, nothing more. Skinflint that I am.... :)

I see that the bigger sizes are also thicker, does that mean they are less likely to chip or doesn't it make any difference  :scratch:
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Offline sbwhart

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Re: ccmt inserts
« Reply #3 on: March 21, 2009, 08:05:31 AM »
Hi Darren

The bigger sizes are thick because you will be taking bigger cuts so they can withstand the load.  The reason the bigger sizes are cheaper is there is less demand for them by ebay customers in industry its the other way round.

Stand by for as crap o cad on the RT.

Stew


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Location:- Crewe Cheshire

bogstandard

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Re: ccmt inserts
« Reply #4 on: March 21, 2009, 09:29:37 AM »
Quote
Searching ebay you often see 09 or 12 size selling at very low prices, but rarely 06 size...

Darren, Stew has hit it square on.

06 size is the standard that everyone has latched on to, mainly because it can be used in an entire range of holders , from say 8mm to 16mm shank size.

Going up a size requires larger tool holders. So the general manufacturers have stuck with the 06 and left the larger sizes to the big boys. So you just might find that the larger tips are cheaper because they are not as popular, but the tooling to hold them is a lot more expensive because they are only made by specialist suppliers.

I found that eventually the small chappies catch up and start to make the cheaper holders. A couple of years ago, the profiling tools all used a small tip, last year I found that larger tips and tooling are becoming available to the general market at much lower prices.

To get back to your original question.

The larger tooling tips will take much heavier cutter loadings. So that will allow production to be speeded up. But remember, your lathe tool holding will have to be beefed up to withstand all the extra cutting pressure.

I don't know if they would last any longer, because tip life is calculated by loading to the tip cutting certain materials versus expected minutes life at that loading.

Tip salesmen always quote faster cutting speeds (loading) and longer tip life compared to their competitors. So you might be seeing odd boxes of tips that have been superceded by a higher spec version.

Unless you are a real expert in carbide tips, you just won't know what you are buying. Some of the 06 tips I have bought over the years have varied greatly in their tool life. I put it down to that I am cutting the wrong material with the tip I have in the holder, but because there is no way of finding out what they should be used for, I just put it down the experience, and hope for the best next time. I find you can get 06 tips from as little as 80p each (bulk purchase of 100 tips) and as expensive as 6 squid each. You pays your money, you takes your chance.

John

Offline Darren

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Re: ccmt inserts
« Reply #5 on: March 21, 2009, 08:26:19 PM »
Thanks guys, I'm now somewhat a little better enlightened... :thumbup:

Those carbide tip choices sure are a minefield, took me a while to figure out what 060204 meant, let alone CCMT.

Then there are all the other shapes  :doh: You have to wonder what all the shapes are for, never mind if one is better than another.... :bang:
You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)