Carbide boring bars

[RichardM]

Does anyone have any links for carbide boring bars which aren't going to break wifeys bank?

 

[tigdlo]

Solid carbide for only 86p including shipping! ttps://www.aliexpress.com/item/1005005378697314.html

What size and insert type are you after? I bought this C08M-SCLCR06 for a long 12mm bore https://www.aliexpress.com/item/1005004217397251.html

 

[RichardM]

C08M-SCLCR06, that one would do. How does it compare to to a steel one of the same size for flex?

 

[tigdlo]

C08M-SCLCR06, that one would do. How does it compare to to a steel one of the same size for flex?

I've not got an 8mm steel to compare, but on my worn out ML7 I can't tell the difference between a 12mm steel and that 8mm carbide, both use the same insert.

 

[Kram]

Ccmt06's are not much good below 10mm bore. The insert is 2.4mm thick, and the seat wants to be the same, near 5mm and double it.

If you want smaller bores, I'd recommed a smaller insert, i'll find my post..

Edit, Id recommend this sort for smaller bores.
Inserts: TBGT060101, bar C06K-STUBR06. I believe that should do a 7mm bore.

I got these

Post in thread 'Today I acquired...........'

Mar 6, 2024

A pack of CCGT030101L-F inserts and a C06-SCLCR03 boring bar. The DCMT0702 insert for size, they are tiny!

• Kram

• 
• 

 

[Agroshield]

How does it compare to to a steel one of the same size for flex?

Deflection formula for cantilever beam here:

https://uploads-cdn.omnicalculator.com/images/deflected/cantilever_beam_deflection_formulas.png

The only thing that differs between steel and carbide, is E, the Young's modulus. As the formula shows, deflection is proportional to E. The E value for steel is 200 GPa; for carbide it is in excess of 500 GPa. Hence, minimum 2 1/2 times as stiff, so 40% the deflection.

 

[RichardM]

Thanks everyone, I'll order an 8mm bar as I already have the 06 inserts and am really looking to standardise with as few insert sizes as possible.

 

[northwest]

am really looking to standardise with as few insert sizes as possible.

Good luck with that, let me know how you get on............

 

[Kram]

An 8mm bar will only have 1.6mm of steel under the seat - it is standard for the insert to be on centre of the bar, even if it wont physically fit in an 8mm hole. They are angled 15 degrees or so which gives a little bit more meat under there, but not much.

 

[Erie Fred]

What project are you needing the higher rigidity ?

 

[northwest]

I find with Carbide it isn't just the rigidity, it is the harmonics too, they can start a bout of chatter that becomes uncontrollable.

 

[RichardM]

I have steel bars already which take 0602 inserts but find in 7 and 8mm diameters they flex, so I don't like using them. I'll see how the carbide one performs when it arrives.

 

[Munkul]

C08M-SCLCR06, that one would do. How does it compare to to a steel one of the same size for flex?

carbide bars are superb compared to steel, you can stick them way out to 5x D, maybe 7x D and they don't chatter half as bad, even the cheap bars.
They aren't however, a magic fix for trying to stick out say 10x D, or something stupid like that

I'd have an 04 insert on an 08 bar.
Keep the 06 inserts for 10 upwards.
If you're spending money, you may as well spend it right.
I have a cheap set of 08, 10 and 12 bars that take 06 inserts, however I've never used the 08 bar as I have another 08 bar made by mitsubishi that uses tiny trigon inserts, and that bar is magic.

 

[tigdlo]

a magic fix for trying to stick out say 10x D, or something stupid like that

I did 85mm long 12mm bore in O2 steel with the 8mm carbide bar I linked above, it was not fun, ended up taking tiny cuts with an aluminium type insert. Definitely a one off hobbyist kind of job, wouldn't be making money like that.

 

[Hood]

.....as I have another 08 bar made by mitsubishi that uses tiny trigon inserts, and that bar is magic.

Aye, superb wee bars

 

[Erie Fred]

I did 85mm long 12mm bore in O2 steel with the 8mm carbide bar I linked above, it was not fun, ended up taking tiny cuts with an aluminium type insert. Definitely a one off hobbyist kind of job, wouldn't be making money like that.

Or a toolmaker.

 

[Munkul]

I did 85mm long 12mm bore in O2 steel with the 8mm carbide bar I linked above, it was not fun, ended up taking tiny cuts with an aluminium type insert. Definitely a one off hobbyist kind of job, wouldn't be making money like that.

I don't have the patience for that kind of thing, it would be a drilled hole if not critical, or I'd buy a reamer if it was critical...

 

[Kram]

I have another 08 bar made by mitsubishi that uses tiny trigon inserts, and that bar is magic.

Link or details please

 

[Hood]

I bought them years ago so afraid there is no link but details of the bar are HERE