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BusyBee tool -- what inserts?

Weird, the BB description under that link says CCMT and 3/8"
C is a rhombic 80-deg, not triangular
3/8 = 9.5mm ....corresponds to what?
Strange. Typo?
 

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YYCHobbyMachinist said:
I hear you bro, I gave up trying to figure out those designations to.

TT-221 should get you what you need.

Craig
Click to expand...

So I had measured the insert thickness incorrectly--the existing insert is really about 2.37 - 2.40 mm so I should have been looking for the "02" size (not 03). Now I can find lots of choices. Thanks for sticking with me.

Craig
 
Brent H said:
Hey Craig,

refer to the site I posted before:

T= Triangle
C= 7° clearance
M= is the tollerance
T= tapered through hole

2= 1/4” inscribed circle
2= 1/8” thick
1= 1/64” radius on the cutter
Click to expand...
Hi Brent:

The site you posted (http://www.carbidedepot.com/formulas-insert-d.htm) seems to have the same information as the one @PeterT supplied (http://www.mitsubishicarbide.com/en.../tec_turning_guide/tec_turning_identification). I found the latter a bit easier to navigate.

Re the radius, 1/64" is 0.4 mm or the "04" designation. That seems to be the most commonly available option out there but PeterT suggested he likes the 08 radius. Have I got it right that the smaller radius should work better with my tiny lathe? Or is the difference trivial?

Craig
 
YYCHobbyMachinist said:
The tool holder is 3/8".
Click to expand...

I think its intended to assist BB customers, But just know that inserts aren't defined by the tool shank size.
For example I use CCMT & my lathe tools vary from 3/8 - 5/8+ and metric in-between. Or round cross section boring bars of nominal diameters 1/4-3/4".
Those triangle/TCMT style inserts are also used in some rotating milling tools & boring accessories which are completely different again.
So that's the likely reason why insert designations never bother suggesting the tool they can go into.
 
trlvn said:
Re the radius, 1/64" is 0.4 mm or the "04" designation. That seems to be the most commonly available option out there but PeterT suggested he likes the 08 radius. Have I got it right that the smaller radius should work better with my tiny lathe? Or is the difference trivial?
Craig
Click to expand...

You'll be fine with those. Dont sweat it. It really varies by so many factors that only you can assess for yourself on the metal, the machine, speed & feed, finish you are after... etc.
When I started out I'd try a few onsey-twoseys from KBC just to test, but the price is so much higher you can buy 5 or 10 from Ebay these days for 1 from a tooling catalog. Lathes that don't have fine feed will tend to have a duller finish with smaller radius. Think of it like cutting a thread. A large radius will make scallops that overlap. But it may limit how much DOC. As hobbyists we don't care so much about production time & can take 5 passes whereas that is a waste of time & power in commercial mode. And their machines are so much more rigid.

And I'm still learning. The other day I was too lazy to change my insert for steel for a quick aluminum job. Damned if it didn't produce a nicer finish that what I typically get on the ones I reserve for aluminum. But despite being coated & different chip breaker, it was an in-between nose radius that just happened to favor that particular cut.

Nowadays even the toolholders are dirt cheap. So if I was starting out I'd spend my time figuring out what INSERT gives me the most flexibility & is most abundant for cost. Then get the toolholders to suit. But you will still run into new situations. TCMT & CCMT & those styles are fine for basic turning & open accessible shoulders. As soon as you get into tighter nooks & cranny situations, you cant get the cutting tool in there & the diamond shape starts looking pretty good. LOL
 
Craig - I have that same tool holder set from BB. I bought a bunch of inserts from Ali express. I'm sure they are nowhere near as good as a sandvik but I'm too likely to bust them anyway. So they've been good and cheap - it's the same stuff BB sells but without the 1000% markup. I also replaced that tool holder set with better ones from nicecutt.com. There are some posts in here somewhere on that. I now use the BB set for horrible turning like removing rust or flame hardened nodules.
 
What did you get and did they work for you?

Also, what size screw holds them down?

Craig
 
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Triangle inserts are plentiful on eBay. I got so many inserts about a year ago+ that for some sizes I have lifetime supply left over. Especially in the TNMT 432 size If I remember correctly.

I wonder whom out of hobby machinists actually buys inserts at say BB or KMS. I mean you can get inserts of same size and better quality at least 10 times cheaper.

I also have 10mm set from BB I got like 5 years ago or so. Have plenty of little triangles left.
 
Tom Kitta said:
I wonder whom out of hobby machinists actually buys inserts at say BB or KMS. I mean you can get inserts of same size and better quality at least 10 times cheaper.
Click to expand...

I hear you Tom, just trying to figure out what to order on Amazon. Can get 10 on-line for 1/2 the price BB wants for 3 on sale.

Just to add to the confusion..... Check out Little Machine Shops insert offerings and retaining screw selection.
 
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YYCHobbyMachinist said:
What did you get and did they work for you?

Also, what size screw holds them down?
Click to expand...
I haven't actually bought any inserts...yet. We've got a major house renovation going on I haven't turned on a machine in over a month!

Based on the help and advice here, I think I need TCMT110208 or TCGT110204 inserts. Carbide Depot was recommended on another site and seem to have reasonable prices. Eg:

http://www.carbidedepot.com/TCGT110208-01-NS9530-P6709737.aspx

http://www.carbidedepot.com/TCMT2151LX-A25Z-P254406.aspx

But it is going to be another month or more before I really have time to play in the shop.

Craig
 
trlvn said:
I haven't actually bought any inserts...yet. We've got a major house renovation going on I haven't turned on a machine in over a month!

Based on the help and advice here, I think I need TCMT110208 or TCGT110204 inserts. Carbide Depot was recommended on another site and seem to have reasonable prices. Eg:

http://www.carbidedepot.com/TCGT110208-01-NS9530-P6709737.aspx

http://www.carbidedepot.com/TCMT2151LX-A25Z-P254406.aspx

But it is going to be another month or more before I really have time to play in the shop.

Craig
Click to expand...

These are NOT reasonable prices at all - they are per insert not per BOX. Carbidedepot is for industrial guys that need specific inserts for specific jobs and can pass on the cost to the client. Not for home shop machinists. Unless you are very rich home shop machinist.
 
Why don't you guys experiment with some cheap stuff, like:

https://www.aliexpress.com/item/329...chweb0_0,searchweb201602_2,searchweb201603_53

or

https://www.aliexpress.com/item/329...chweb0_0,searchweb201602_2,searchweb201603_53

What can go wrong with a set of 10 for 10 bucks?

or

https://www.aliexpress.com/item/400...chweb0_0,searchweb201602_2,searchweb201603_53

As for little machine shop - their whole selection is at super high prices as far as inserts etc. go. Come on, 5 USD per insert? How do they plan to compete with China at more then 5x less? Is the quality better - as in China better then US - not the other way around - maybe. China is the worlds largest manufacturer of carbide. I would not be shocked if better grades of carbide from China already surpassed the best US has to offer.
 
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