Woodturning scraping tools

[CedarSlayer]

To drill HSS, I use carbide bit for drilling cement, lubricant and a slow speed. I use cement bits because they are simple, cheap and easy enough to sharpen. You need a sharp bit but diamond grit will do a good job on carbide. Here is an example of a fellow drilling HSS.

Bob

[Christophe Mineau]

Many thanks Bob for the trick.
the video is heavy duty !
I did this one time with a drill made for glass and ceramic tiles, it did the job, but it's not easy.
I'm curious to see what shape you give to your cement drill bits to tackle the HSS ?
I suppose you don't leave that dull shape like for stone or concrete ?

[Hotz]

Bob really interesting this process.

[Altair]

Great work as always Christophe.

Thanks Bob for the helpful video.

Al

[CedarSlayer]

Many thanks Bob for the trick.
the video is heavy duty !
I did this one time with a drill made for glass and ceramic tiles, it did the job, but it's not easy.
I'm curious to see what shape you give to your cement drill bits to tackle the HSS ?
I suppose you don't leave that dull shape like for stone or concrete ?

I don't do it a lot, but when I do, at most I just refine the edge. The high angle edge is stronger. As it is, when drilling small holes chatter can destroy a bit quickly. So I tend to go with really cheap concrete bits. The only time I have needed a precise and smooth hole, was making a HSS folding knife from a Harbor freight blank.

I never did make a precise smooth hole. I ended up pounding a brass rod into a larger hole and then putting a precise smooth hole in that.

Bob

[Christophe Mineau]

Good idea for the brass bushing ! Thanks

[CarolC]

Hi Chris,
I have read a lot of your posts over the past several moths and have really enjoyed them. Great job and thanks so must for taking the time to share them.
I do have one sorta off-topic question. How can a person get a little jumping and throwing his arms up in the air smilet like you have? I just can't stop laughing when I see it.
Thank for any help you can give. CarolC