9 UK made CBN inserts CNMA 120408 T DE These have T-land
grade DR-50: For finish-machining of hardened steels and certain softer ferrous materials:
surface and through hardened steels, High speed steels, bearing steels, hot - work die steels
cold - work tool steels, grey and chilled cast iron, sintered irons
These are re-grinds. They have been re-ground - at David Richards (the manufacturer) and are therefore slightly undersize - 12.50 - 12.66mm across flats as opposed to 12.7mm on the originals. Still big enough to pulled tight into any toolholder that uses top clamps or cam pins. The cutting edges are the same as on a new insert.
These will fit holders that take CNMG 1204.. inserts. They have two cutting edges per insert - one brazed CBN insert brazed into one corner, but the inserts are reversible the same way as a CNMG insert so the bottom and top can be used.
PCBN cutting tools machine hardened steels with apparent ease because, using relatively high surface speeds. Heat is generated at the point of cutting so the PCBN tool cuts locally softened material. The heat is carried away by the swarf, which becomes brittle and harmless, and the PCBN tool, which has a high co-efficient of thermal conductivity. If a light cut is required, however, a tool with a high CBN content conducts too much heat away from the shear zone and the conditions for efficient machining cannot be achieved. DR-50 & DR-450 have a low CBN content and the individual CBN particles are isolated within a ceramic matrix. This gives the materials a lower thermal conductivity and greater wear resistance in finish cutting operations. Low CBN tools can therefore keep sufficient heat at the cutting point to enable the optimum cutting conditions to be achieved when a light cut is taken. In most cases, even when very light cuts are required, low CBN tools employ negative rake geometry to provide a strong edge. Due to the nature of cutting, however, cutting forces are still very small.
Completely unused in the original box. The box is slightly shop soiled.
The photos are of the items that you will actually receive.
I have been a toolmaker for twenty years, but unfortunately I have had to wind down the manufacturing side of my engineering business, and I'm now concentrating on buying and selling. There will be many more items listed over the coming years, so please check them out if you have time.
I am not registered for VAT so there is none on the sale.You will receive a paper invoice with all items sent by me.
Items will posted by Royal Mail first class.
UK buyers: Items paid for before 2 pm Monday - Thursday will normally be with you the next day.
I don't post on Saturdays, so if payment is received after 2 pm on Friday, the items will be posted on Monday.
I buy unused carbide inserts at good rates, please send me a message if you are interested.
International buyers: I will post items using Ebay's Global Shipping Program where eligible. The international shipping rates and times will then be automatically displayed. If you are buying more than one item, please add them to your basket before paying, and the shipping charges will be automatically combined. If you pay for them separately, I will have to send then to the UK shipping centre separately.
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