[Jim Dawson]

This may change your (and my) thinking on surface speeds. But it may require a really rigid machine. I think the key is the tool path and of course the tool. So 7200 RPM, proper carbide endmill, proper engagement and tool path should work.

https://youtu.be/6dFL3QIZwz8

[QuinnSjoblom]

This may change your (and my) thinking on surface speeds. But it may require a really rigid machine. I think the key is the tool path and of course the tool. So 7200 RPM, proper carbide endmill, proper engagement and tool path should work.

https://youtu.be/6dFL3QIZwz8

Ha! 19k rpm with a 3/8 tool in steel, 1860 sfm. That's insane! Yeah I'm sure I'll probably be ok with my 1/8 at 7200.

[mactec54]

This may change your (and my) thinking on surface speeds. But it may require a really rigid machine. I think the key is the tool path and of course the tool. So 7200 RPM, proper carbide endmill, proper engagement and tool path should work.

On a $250 thousand Plus machine anything like this is possible how could you make a comparison to a $150 to $250 dollar spindle that is not designed to cut steel

[Jim Dawson]

On a $250 thousand Plus machine anything like this is possible how could you make a comparison to a $150 to $250 dollar spindle that is not designed to cut steel

You mean that you can't do that on just any Chinese table top router, huh, I'll be darned, who would of guessed? :stickpoke

I have been chatting with QuinnSjoblom on various subjects on this forum long enough to know that he would understand the point of my post and get the joke. And I could tell from his response that he got it, unlike others. HeII, my Haas wouldn't even do that, that DMU 50 in the video has a 50 HP spindle and weighs ~12,000 lbs.

[QuinnSjoblom]

You mean that you can't do that on just any Chinese table top router, huh, I'll be darned, who would of guessed? :stickpoke

I have been chatting with QuinnSjoblom on various subjects on this forum long enough to know that he would understand the point of my post and get the joke. And I could tell from his response that he got it, unlike others. HeII, my Hass wouldn't even do that, that DMU 50 has a 50 HP spindle and weighs ~12,000 lbs.

Haha! Nope, I totally took that as "you should crank it up to 19k and just let it rip" lol.

Totally understood Jim's post. obviously I can't do that with my machine, but at the same time I think it shows what modern carbide tooling can do these days and standards for specific sfm in specific material is definitely not set in stone.

[deadlykitten]

hi quin, i noticed that you + jim = love

i don't have jim's patience

about 'modern' carbide, i set up long term setups. and differences between low quality carbide and high quality are like 1-2 hours versus 4 shifts, on same cuting specs

depends, but less tool changes are better, and also less offset corections is better / kindly

[deadlykitten]

so would think coolant should allow the limits to be pushed further

some tools, especially when milling, may break because of thermal fluctuation : for example, if the tool is cutting between 0*-45* and coolant is on 0-45, then, things are 'stable' as long as the coolant flow is stable

if tool is changing cutting side, to 90-135*, but there is no coolant in that area, then a termic shok apears when leaving / entering the coolant zone

solution :
... through tool coolant
... coolant flood ( using showers, etc )

some tools are sensitive to termic shock, so, is better to go 'dry', as long as coolant flow is not uniform arround the tool; from this perspective, some tools are designed to go 'dry'

on some setups, there is a reaction between the colant and the material, near the cuting edge, which is not benefic for the tool; about this last thing, i did not experimented it, i was only told / kindly

[mactec54]

You mean that you can't do that on just any Chinese table top router, huh, I'll be darned, who would of guessed? :stickpoke

I have been chatting with QuinnSjoblom on various subjects on this forum long enough to know that he would understand the point of my post and get the joke. And I could tell from his response that he got it, unlike others. HeII, my Hass wouldn't even do that, that DMU 50 has a 50 HP spindle and weighs ~12,000 lbs.

You where just fantasizing we got it, but some would still think it is possible by what you posted (nuts)

You would be surprised this same thing has been done on Haas machine before and by Zone members

[deadlykitten]

But it may require a really rigid machine

hello jim, yes, there are a few things

on a more rigid machine, you can go faster, but is good to know how to scale the process to fit a less rigid machine

otherwise, is dangerous, even on a rigid machine

on okuma ( lathe, mills ) i use load comparative method, checking load dinamycally to avoid sudden peaks, that may lead in time to signifiant wear

also, diff is cheked, to avoid increasing the backlash

is easy to say, but harder to implement; not impossible

in short, it is required to monitorize the process, observe and adjust accordingly, like mapping the feedrates, and others

also, there are forces that can not be monitorized, but may distroy the machine, especially when going such fast

there are persons that simply avoid such specs, because, even if they work ok, they can not predict or react fast in case of a sudden failure, with not-so-nice consequences / kindly