Drill press advice needed

[Kakurando]

A HSS twist drill 1/8" in diameter run at a conservative 700 FPM in wood yields a spindle speed of 21,000 RPM.

Common aluminum alloys at 200 FPM would be around 6000 RPM under ideal conditions, the numbers appear spot on with this tool.

If that's the case, my original question was if the friction from the higher rpms would be a hazard in possibly burning wooden stock.

 

[chips&more]

Our great great great ancestors didn’t use a powered drill press to make musical instruments or time pieces that are works of art! They didn’t have a cutting speed chart either!

 

[Kakurando]

Our great great ancestors didn’t use a powered drill press to make musical instruments or time pieces that are works of art! They didn’t have cutting speed chart either!

You're right. But none of us are our ancestors. Your antagonism is puzzling

 

[Beerfan]

If that's the case, my original question was if the friction from the higher rpms would be a hazard in possibly burning wooden stock.

The chips will be the problem, if you do not peck sufficiently they will pack the flutes and cause a good deal of friction and heat.
Once past four or five diameters deep peck one diameter at a time until the full depth is reached, this is cumbersome with a manual machine of course. For example a 1/16" drill through 1" of wood the first peck would be 4/16" followed by twelve 1/16" pecks.

Most importantly do not allow the chips to bind the drill in the hole, when you retract after every peck make sure that the chips are cleared from the flutes, this may require a compressed air blast.

 

[Eddyde]

16,000 rpm should be no issue for wood, considering routers are usually spinning even faster. The slower 1200ish rpm would be fine for small diameter drills in metal.

 

[Kakurando]

The chips will be the problem, if you do not peck sufficiently they will pack the flutes and cause a good deal of friction and heat.
Once past four or five diameters deep peck one diameter at a time until the full depth is reached, this is cumbersome with a manual machine of course. For example a 1/16" drill through 1" of wood the first peck would be 4/16" followed by twelve 1/16" pecks.

Most importantly do not allow the chips to bind the drill in the hole, when you retract after every peck make sure that the chips are cleared from the flutes, this may require a compressed air blast.

Thanks for the information. That is very helpful

 

[Kakurando]

Picked up the little Dumore, it's a screaming little thing. Fits right in my little apartment.

One thing I wish I'd checked though is the chuck seems to have a bit of runout, plus the jaws are a bit cockeyed. Might just need to be replaced, thoughts?

 

[EmilioG]

The Dumore, like the Hamilton, is made for small drills. It should work really well with metal or wood, and plastic, if you can slow it down.
Is the Dumore an MT spindle? How does the chuck attach to the Dumore?
These small DP's are great for small parts. The Hamiltons are pretty rare. Dumores seem to be easier to find.
I wonder what the run out is like. I would think, that to use small drills, the run out would have to be on the low side.

 

[dewbane]

The big problem with wood is not friction from the RPMs, but friction from the chips. Small bits load up quickly, and small bits at high spindle speeds load up very quickly. Backing out the bit won't necessarily clear the flutes, and this can be true with certain metals as well.

Pull your 1/8" bit into a piece of resinous tropical hardwood (eg. rosewood) at 16,000 RPM, and the flutes will be jammed instantly, and now you're burning your way through the hole instead of cutting. This can get out of hand and become a smoky mess quickly. I've done more than one project where I had to stop and rake the flutes clear multiple times to get through one hole in a piece of wood. The same is true using Forsner or sawtooth bits. I'm new to the lathe and mill, but I've used my drill press on all kinds of wood and metal for 20 years, and I usually leave the spindle running on the first or second slowest speed possible. I very, very rarely ever take it up above 800 RPM for anything ever.

You CAN go faster, but that doesn't mean you HAVE to go faster. This will depend on your production schedule, of course.

Routers spin at around 50,000 RPM, but router bits have a totally different geometry. They're much more efficient at any size for clearing waste than twist drills.

 

[12bolts]

Routers spin at around 50,000 RPM

10-20k is the norm. I think 50k may be pushing the envelope

but router bits have a totally different geometry. They're much more efficient at any size for clearing waste than twist drills.

when used in thier correct application, as would apply to any tool

Cheers Phil