Drilling Cast Iron - Tormach CNC

[bestamerica]

'

how come not use a cool oil mix with water on the drill

[wa1523]

@bestamerica for the first drilling it's useless because it's tungstene , but for the HSS I would use some...

[TheMathedis]

@bestamerica some tools require different coolants and some tools don't even need coolants

[soundspark]

@TheMathedis Also cast iron is often machined dry because it is porous and can easily absorb contaminents like oil or coolant. Also, the fine dusty chips can turn to a nasty sludge that clogs up your coolant system.

[RUSSSELLLLL]

I used to turn CA on an 84" VTL.. The sound brings back memories lol. Many long nights. Would it be faster drilling if you had coolant? we used coolant for the turning process of course. Nice video!

[liaschinko]

it is foundry iron ?

[kuei1248]

Do you know what a "drill bit" is? A drill bit is a broken drill. But don't worry. At those feeds and speeds you will never end up with drill bits. BTW...why would anyone use a tin coated drill on cast iron? And why peck on a spot cycle?

[rick371]

sesh slow....unless u slowed the rapids down, and why not tap at same time...also useing a smaller stub drill at that size you do not need to centre drill...i could do this whole process and tap in 3 mins

[kyle1058]

slow machining in my opinion.. very slow... why not throw in a solid carbide drill bit, use coolant, and run it FAST with no peck?

[redramage]

Any reason to not use a shorter bit and crank up the feed?

[Metalloys]

to caulk04 : I assume because you cannot use cutting fluids or coolants with cast iron, so peck drilling keeps the bit cool - cast iron generates more heat due to friction than steel - I think (?)

[SupermaxCNC]

True, there is no need to use coolant with cast iron. Cast iron has a large amount of free graphite in the matrix so cutting fluid is not needed. But it often is in production to remove chips. Using cutting oils makes a sticky messy iron paste.

Cast Iron has one of the lowest coefficients of friction of any metal. Lower than brass even.

Caulk04 is right, there is no need to peck with this cast. They could have gotten away without a center drill to if they used a screw machine length bit.

[liaschinko]

@SupermaxCNC

how you know that is Cast iron ?

[2jzgtejza80]

@liaschinko

Listen the video again.

[hoppercar]

why do the axis's sound so noisy when the machine moves???

[SupermaxCNC]

Stepper motors make a lot of noise. And are slow.

[Abovegroundminer]

It's called a demostration.

[83matte07]

Why you don't use a widia drill without a center drill?

[caulk04]

Why not use a G82 cycle? No need to peck in cast iron, much less with a center drill. Very conservative machining parameters...

[ericdogloi]

Hey nice video do cnc's move by them self or do you have to move it ? like can you just type in the pc what u want drillerd and it does it wall u go eat or something?

[41Zman]

they are automatic after the design has been entered. after that hit go and sit back