AWGB Woodturning Forum

General Category => Tool tips & reviews => Topic started by: Bill21 on December 18, 2022, 10:48:53 AM

Title: Cutting with Carbide
Post by: Bill21 on December 18, 2022, 10:48:53 AM
I believe this adequately dismisses the myth that Carbide insert woodturning tools only scrape?

https://youtu.be/3y7C4B-1EFQ (https://youtu.be/3y7C4B-1EFQ)


Title: Re: Cutting with Carbide
Post by: seventhdevil on December 18, 2022, 03:20:17 PM
i never realised that it was a myth that needed dispelling?

most carbides are designed as scrapers as i believe his maybe? (i may be wrong) but in that video he is bevel rubbing.

you can bevel rub with both carbides and traditional tools, and you can scrape with both too.
Title: Re: Cutting with Carbide
Post by: Bill21 on December 18, 2022, 06:34:28 PM
I never realised that it was a myth that needed dispelling?


I’ve heard “carbide turning tools are just scrapers” many times.
Title: Re: Cutting with Carbide
Post by: BrianH on December 19, 2022, 08:55:12 AM
The biggest problem with this type of discussion is that traditional terminology is, in my view, unhelpful and, factually incorrect. If we look closely enough I think it becomes fairly obvious that a properly sharpened 'scraper' cuts very efficiently whereas a blunt 'cutting tool' scrapes.
Just use the best tool for your purposes and let it go at that would be my advice.
Brian
Title: Re: Cutting with Carbide
Post by: Hallelujahal on December 19, 2022, 11:54:27 AM
“properly sharpened 'scraper' cuts very efficiently whereas a blunt 'cutting tool' scrapes.“

I find this an extremely useful descriptor
AL
Title: Re: Cutting with Carbide
Post by: Paul Hannaby on December 19, 2022, 12:04:07 PM
But you can get shavings off a scraper so it doesn't really prove anything!
Title: Re: Cutting with Carbide
Post by: Bill21 on December 19, 2022, 01:21:47 PM
But you can get shavings off from a scraper so it doesn't really prove anything!

Proof may perhaps be in the finish achieved. Did you watch the video?
Title: Re: Cutting with Carbide
Post by: Bill21 on December 19, 2022, 02:21:37 PM
Contrast the technique in the video of my OP with this one. The difference should be quite clear.

https://youtu.be/Iz24N--APtI
Title: Re: Cutting with Carbide
Post by: seventhdevil on December 19, 2022, 05:19:29 PM
I never realised that it was a myth that needed dispelling?


I’ve heard “carbide turning tools are just scrapers” many times.

that statement is correct. in general most carbides are meant to be used in a scraping fashion.
however if the tool allows it they can quite easily be used with a bevel in contact to slice rather than scrape as that fella demonstrates...