An older video that shows in good detail the need for proper cutting tool shape

[Millbo]

Everyone,
I ran across this video on youtube and thought it would be good to share with those new to machining.
There's some good close up, slow motion video of the chip forming action during the cut on a planer....very cool.
I copied the video URL at the point where the explination begins.
https://www.youtube.com/watch?v=bdD57NeOuio&feature=player_detailpage#t=316

Another video on the same topic but gets into drill bit sharpening:
https://www.youtube.com/watch?v=AfhZDQJ9168

Video on work holding:
https://www.youtube.com/watch?v=KDAxrbffDes


Video on lathe types and operations:
https://www.youtube.com/watch?v=EqRMwU1AuDg

Here's the channel that uploaded all these videos. There's others like heat treating and the like in there:
https://www.youtube.com/channel/UC6G6nfxpNP4tLZdJFIkx69w

 

[stupoty]

Nice find, very interesting and clear.

Stuart

 

[drs23]

Nice find, very interesting and clear.

Stuart

Yeah, 'cept they talk funny...:LOL:

 

[FirstEliminator]

Thank you for posting those videos.

I've often thought about buying a tool and cutter grinder to more precisely grind angles on the tool bits. I can get kinda close free hand, but I am not that great at it. There never seems to be enough hours in the day to do this extra stuff.
You may ask "why bother with grinding tool angles when you can simply buy insert cutters?" Inserts, well, carbide inserts cut great in a lathe or mill. But, in a shaper? Carbides are likely to chip on the back stroke or chip during the interrupted cut. Plus shapers really can't get the surface speed. Shaper work is very interesting to me and I use mine almost as much as the lathe. Since I recently asked about using carbides in a shaper on the PM forum, another reason to use HSS in an older or smaller lathe is those lathes just don't have the horsepower required to turn a big depth of cut in high gear. I'm sure there are more reasons why HSS is still important to keep around. Like, they are cheap and can be easily resharpened.
Instead of buying a T&C grinder, it might be fun to make a jig to hold the square tool bit that would mount in the surface grinder to position the tool in several different angles to make the clearence and rake angles. Hmmm, where do I find the time?

Mark
Berkshire Transmissions
North Adams, Massachusetts

 

[stupoty]

Thank you for posting those videos.

I've often thought about buying a tool and cutter grinder to more precisely grind angles on the tool bits. I can get kinda close free hand, but I am not that great at it. There never seems to be enough hours in the day to do this extra stuff.
You may ask "why bother with grinding tool angles when you can simply buy insert cutters?" Inserts, well, carbide inserts cut great in a lathe or mill. But, in a shaper? Carbides are likely to chip on the back stroke or chip during the interrupted cut. Plus shapers really can't get the surface speed. Shaper work is very interesting to me and I use mine almost as much as the lathe. Since I recently asked about using carbides in a shaper on the PM forum, another reason to use HSS in an older or smaller lathe is those lathes just don't have the horsepower required to turn a big depth of cut in high gear. I'm sure there are more reasons why HSS is still important to keep around. Like, they are cheap and can be easily resharpened.
Instead of buying a T&C grinder, it might be fun to make a jig to hold the square tool bit that would mount in the surface grinder to position the tool in several different angles to make the clearence and rake angles. Hmmm, where do I find the time?

Mark
Berkshire Transmissions
North Adams, Massachusetts

hss is king , especialy for cost as a hobby type thing. And you can experiment with different angles or radius's.

I do need a better bench grinder, the cheep bench top unit has a lot more vibration than the old line shaft one, hummm just the space it takes is a bonus.

ive taken to rough shapeing on grinder then hand stoning them to the finnish.

Ive been using my hand shapper more of late, it's quite awsome considering(the power source), and keeps me from the gym ;-)

Stuart

 

[Sammo]

On 1st video I noticed straight away that the side of the wheel is being used to grind the cutting tool.

I was taught NEVER under any circumstances use the side of a gring wheel

In my opinion this is an accident waiting to happen.