Hey all!
I bought a new CMT Dado set (CMT 6" and 8" Dado Blades : CARBA-TEC), with a 5/8" bore

I bought this with the intention of getting it bored out to 3/4" bore.

I was quoted a price of $11 a blade, and said that it would be easy, and ready on wednesday - this was from a blade saw sharpening shop.

I have only a basic knowledge of metalworking, today i went to pick of the blades after getting a call to say they are ready and the guy said that the black chippers were super hard to drill though and had ruined his $400 reamer? (long tapered cutting tool) and he had to start doing them on the mill which also stuffed up his drill bit (he showed me an ordinary steel twist drill bit). He said that they may need to be sharpened on his cnc sharpener to get them concentric but upon inspection it looks as though he has already done it - to all the chippers (but not the side blades) - meaning its not going to give a flat bottom.

He still needs to get a new reamer in to do the remaining two blades, (which he has started). When i tried the saw blades, only two fit, (measuring 19mm with the callipers), the rest measure 18.9mm meaning that they do not fit on the arbour. I asked for 3/4", which is 19.05mm.

I understand that the chippers are a hard steel/ alloy, but is the ordinary way of going about this? I was reading on the internet that you can put them on a metal lathe and use a carbide bit?

Cheers,
Tom

Replies here please

https://www.woodworkforums.com/f65/sa...please-175295/