Carbide Grade?

After much searching at Harrogate managed to find a couple of 5/8 shank brazed tip parting off tools. Both "toolmex" which I've had before.One is blue painted & stamped P20, the other is red & stamped K20. The stallholder had no real idea what the diference is. Both tools appear to be ground identically, so it must be tip grade / material suitability, have a vague idea that I should know this, but don't ! any ideas? Average show otherwise. Mark G.

Reply to
Mark G
Loading thread data ...

2nd hit on Google....

formatting link
Peter

Reply to
Peter A Forbes

OK, but from chart I see not much difference between "P20" & "K20", so do I continue as normal and select tool by smell/mood/whichever is nearest. Thought that for a change( as both tools ground the same) I'd try and use the best for material. At a guess I'd say the P grade being 0.5 RA harder than K would suit cast iron / brass better, and K for steels ??? Mark G

Reply to
Mark G

Best to go with your feelings IMO, not as if you are doing bulk production work where material removal rates are critical :-))

Peter

Reply to
Peter A Forbes

Blue P20 Roughing of steel and steel castings using moderate to low cutting speeds under unfavourable conditions. A general purpose grade for small workshops where a variety of steels are machined.

Red K20 Finishing and light roughing of cast iron and other short chip materials using fine to moderate feeds and moderate to high cutting speeds under favourable conditions. This grade is also suitable for milling operations.

-- Regards,

John Stevenson Nottingham, England.

Visit the new Model Engineering adverts page at:-

formatting link

Reply to
John Stevenson

So long as the swarf is blue and not red it is about right.

Reply to
briano

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.