Brother Speedio 16k spindle question

[Mtndew]

Our speedio has the 16k spindle, and we have a bunch of 8620 material that gets a bunch of 30mm holes thru about 1" of material.

Realistically, how big of a solid carbide drill or a replaceable tip Sandvik 870 drill can I get away with without stalling the spindle? Can I expect a 3/4" drill to do the job? 25mm?
I know that the 10k spindles can do a 50mm according to their videos.

I've only ran aluminum and copper in this machine, this is a big job and I wanted to get the cycle down to as short as possible.

 

[2outof3]

D18(0.71)×0.1(0.004)

Above is the call out from the brochure for 16k spindle carbon steel.

 

[Pete Deal]

I don’t think you’ll get too close to that diameter drilling it. I tried I think a 1-1/8” drill in aluminum in mine and it stalled the spindle. I use a 3/4” drill pretty often in aluminum and I think that’s about as big as I’d want to go. I think you’re going to have to drill it 5/8” or so and mill the rest. If you drill it through then maybe use a roughing cutter full depth of cut w/ small step over and just spiral out?

 

[Mtndew]

D18(0.71)×0.1(0.004)

Above is the call out from the brochure for 16k spindle carbon steel.

What is the .004" referring to?

 

[70olds]

What is the .004" referring to?

Feedrate maybe?

 

[gregormarwick]

It wouldn't be quicker to use an insert drill? A lot less torque required compared to a solid or replaceable tip drill, good chance you could hit the 30mm directly...

 

[Mtndew]

It wouldn't be quicker to use an insert drill? A lot less torque required compared to a solid or replaceable tip drill, good chance you could hit the 30mm directly...

I can try, but I doubt I'll come close to the 30mm size, the 16k spindle doesn't have a lot of torque compared to the 10k.

 

[Finegrain]

Remember you have to hold it in a BT30 toolholder --

It wouldn't be quicker to use an insert drill? A lot less torque required compared to a solid or replaceable tip drill, good chance you could hit the 30mm directly...

All of my insert drills have shanks bigger than the cutting size -- 30mm insert drill thus would have a >30mm shank, which is impractical to hold onto in a BT30 spindle.

Regards.

Mike

 

[dpolseno41]

I've been drilling .734" diameter 1" Deep in 1018 with a Walter insert drill on my 16k spindle. I absolultely would not want to go any bigger. I can't even push it hard enough to break the chips. I mean maybe I could but I've no desire to fuck around and find out. 5/8" and under is far more comfortable I'd say.

 

[gregormarwick]

Remember you have to hold it in a BT30 toolholder --

All of my insert drills have shanks bigger than the cutting size -- 30mm insert drill thus would have a >30mm shank, which is impractical to hold onto in a BT30 spindle.

Regards.

Mike

Not an issue if you go Sandvik, you can get BT30 Capto adapters in C3/C4/C5, and 30mm 880 drills with C4 or C5 backend

 

[Mtndew]

We are getting 800 more of these soon, and they each have 8 holes in them so I'll definitely be trying out larger drills and see what I can get away with. I'm leaning toward the 18mm and push it to near the limit.
Thing is, there isn't a percentage load meter that I can see, just a bar graph that changes color as the load gets higher. And that really doesn't tell me much.

 

[gregormarwick]

If you have to mill it out to 30mm anyway do you actually gain much by predrilling it vs helixing through it?

 

[Mtndew]

If you have to mill it out to 30mm anyway do you actually gain much by predrilling it vs helixing through it?

I do gain a few second per hole because I can take 1 roughing helix pass with my 1/2" end mill. Also a hole allows for chips to evacuate thru so my end mill doesn't re-cut them. It still happens, which is why I'm wanting a larger drill to allow for less recutting of chips.
And if I save 3 seconds per hole on 6400 holes, that's over 5 hours saved during the run.

 

[Mtndew]

I am also thinking of getting an indexable high feed mill with TSC and then I can bypass the drill. This is probably the best route.

 

[gregormarwick]

I am also thinking of getting an indexable high feed mill with TSC and then I can bypass the drill. This is probably the best route.

That's exactly where I was going with that question!

I'm curious what absolute times you're looking at per hole?

I'm thinking I could probably hit that hole in about 20 seconds in that material with a high feed if I had your machine to play with...

 

[gustafson]

Would it make more sense to drill with something you can pound through, like a 1/2 and helical ramp with a ~5/8 EM, interpolate the finish? yes two tools but keep the feedrates up where it is productive.
Rereading that is kind of what you are doing.
I guess my point is that if you stay with tools that you are not slowing due to power you should be going faster

 

[eaglemike]

Just a quick question, didn't see this mentioned. Is the RPM you are using in the biggest torque zone? Will the tool you are using work there? I've had a couple of jobs in the past that ram better when I took a close look at the torque chart.
good luck!

 

[BT Fabrication]

this is what they claim it handles. guessing 18mm is max

 

[Mtndew]

Just a quick question, didn't see this mentioned. Is the RPM you are using in the biggest torque zone? Will the tool you are using work there? I've had a couple of jobs in the past that ram better when I took a close look at the torque chart.
good luck!

I'm using a 1/2" drill at the moment and it's fine. I was debating on going with a larger drill, but now I think I'll just go a different route.

 

[Mtndew]

View attachment 395160
this is what they claim it handles. guessing 18mm is max

Thank you!