1640hd Has Arrived

[wrmiller]

I looked for a PBA combo, as I thought it would definately be nice to have but never found one offered anywhere. But I was looking for these little wimpy 8" chucks.

 

[wrmiller]

It's just some 2" 1018 I had laying around.

Thanks. Reason I asked is I like to run most of my work above 1k rpm and keep getting 'told' that my speeds are too high. And that you can't sneak up on a dimension. And carbide can't take light cuts, blah, blah, blah... So I always ask when I see guys running similar speeds/feeds.

 

[Cmesler]

My understanding is that carbide likes high speeds. Hence all your Cnc machines turning a few thousand rpm use carbide tools/inserts. Now certain style inserts like a cnmg like a heavier cut. Also chip breakers and lead angles start coming into effect. But this tnmg tool seems to not mind either way. The inserts are some NOS teledyne.

 

[wrmiller]

Yea, my understanding of carbide inserts is severely lacking to say the least. Even though that's all I use. I need to work on this.

 

[Cmesler]

Here is a link to a seco program you can download. Pretty neet to play around with.
https://www.secotools.com/en/Global...ol-Selection-Support/Secolor-Selection-guide/
They have a book out I'll have to find it. That has all the insert breakdowns of how they should be used, speeds and feeds etc.

 

[wrmiller]

Cool. Thanks!

(Oops...looks like windows only. Mac guy here)

 

[Cmesler]

Yea same here I can't stand Windows. I have it downloaded on the shop laptop ( Hewlett crapard) only reason we have it is for diagnostic software. I'll see if I can find the link to that book. It's free and about 3 inches of very helpful information.

 

[wrmiller]

Cool. Thanks again!

 

[jbolt]

(Oops...looks like windows only. Mac guy here)

I knew there was something not quite right with y.....

 

[tmarks11]

For a large lathe there is no law preventing you from mounting a smaller chuck on the appropriate back plate to keep the weight to a manageable scale.

True, although since it is probably a D1-6 spindle, you won't find a direct mount chuck smaller than 8". You can mount a smaller chuck on a backplate, but again, the smallest backplate you can get is going to be 8". You can turn that down a bit (to 7-1/8") to match the spindle, and maybe turn it at an angle to match the chuck diameter (I have a 5" 5C D1-5 chuck mounted like that).