Metric drill size vs rpm chart?

[drummerdimitri]

I'd like to print and laminate a metric drill size vs rpm chart for twist drills and hang it near my drill press for easy reference.

A chart that goes from 1-13 mm would be ideal and ever better if it is more comprehensive of course as long as it doesn't inch measurements it should be good enough.

Also, it would be great to have speed settings for different metals such as steel, stainless steel and aluminium.

Does anyone know where to find such a chart? Been having a hard time finding exactly what I'm looking for on the net.

 

[bob15]

a quick Google search: https://i1.wp.com/ttp-hard-drills.com/wp-content/uploads/2018/09/Metric-speed-and-feed-sheet-e1537795412627.jpg?w=1080&ssl=1

 

[drummerdimitri]

a quick Google search: https://i1.wp.com/ttp-hard-drills.com/wp-content/uploads/2018/09/Metric-speed-and-feed-sheet-e1537795412627.jpg?w=1080&ssl=1

Thanks but that's not what I was looking for.

 

[MushCreek]

I would just convert an SAE one, enter the values in Excel, and print out a chart.

I never use charts anyway, but after 45 years as a tool maker, I generally know how fast to run a certain size cutter without looking it up. It depends upon the material being drilled, the drill bit itself, the machine being used, and whether there is coolant involved. There's a big difference between a quality drill bit in a CNC machine with flood coolant, and a hand-held drill and cheap bit being used dry.

You can look up the recommended speed in Surface Feet per Minute for various materials. I imagine you can find a metric equivalent (Surface Meters per Minute?) Do the math and make your own chart. I did find a chart to get you started-

https://www.icscuttingtools.com/pdfs/Drill-Speeds-RPM-metric.pdf

 

[dr_clyde]

Get yourself a copy of Machinery's Handbook. It will have all the info you need. Then just type up a spreadsheet with all the pertinent info to what you work on and the tools you have.

Mush has the answer. It may not be what you think you want, but it is the correct answer. There isn't a chart that has all the information you want, because there are too many variables. If you do find such a chart, you'll find it lists ideal conditions and may or may not be exactly what you have at your disposal. Most drill presses have like 8 speeds. Unless you're running CNC equipment, you won't have a way to regulate RPM and feed to match the SFM you need in an ideal world.

All cutting tools run best at a specific SFM (surface feet per minute). That changes with a lot of factors that are unique to your situation.

 

[drummerdimitri]

Get yourself a copy of Machinery's Handbook. It will have all the info you need. Then just type up a spreadsheet with all the pertinent info to what you work on and the tools you have.

Mush has the answer. It may not be what you think you want, but it is the correct answer. There isn't a chart that has all the information you want, because there are too many variables. If you do find such a chart, you'll find it lists ideal conditions and may or may not be exactly what you have at your disposal. Most drill presses have like 8 speeds. Unless you're running CNC equipment, you won't have a way to regulate RPM and feed to match the SFM you need in an ideal world.

All cutting tools run best at a specific SFM (surface feet per minute). That changes with a lot of factors that are unique to your situation.

Ok it makes sense now, guess I will just have to make my own spreadsheet as you mentioned.

Regarding the Machinery's Handbook, is it in Metric or Imperial? I only use Metric so it wouldn't be of much use especially for the price if I would constantly need to convert back to metric every time I need a piece of information.

Also, I'm going to invest in a Flott drill press since it seems to be one of the very few on the market where you can set your desired RPM from 40-4000 without having to adjust any silly belts and only have 6-8 speeds to chose from like most other drill presses flooding the market so that should make my life easier as I can dial in the rpm with much better accuracy.

 

[dr_clyde]

Machinery's Handbook has metric and inch. It's the bible for all things machining and mechanical.

 

[bdbecker]

I'd also add that having the most current edition of the Machinery's Handbook isn't really necessary for the home shop and used, older versions can usually be found for a significant savings. Most of the info a home machinist would need doesn't change between versions, the updates are mostly adding in information related to newer technologies.

 

[dutchgray]

I'd also add that having the most current edition of the Machinery's Handbook isn't really necessary for the home shop and used, older versions can usually be found for a significant savings. Most of the info a home machinist would need doesn't change between versions, the updates are mostly adding in information related to newer technologies.

Yep, just don't buy a really old edition, I have a 21st edition which is 1979 and is fine for the home shop. Get on Ebay and pick one up.

 

[larry_g]

Another thing to beware of is that most of the speed charts are pointed at the manufacturing people. The charts are about getting the best production rates for the money. They assume a limited life for the drill bit before replacement or resharpening.If your not in a production mode then 1/2 to 3/4 of the chart speed may be correct for you.

If your really want information overload then go here and drill down through the layers.

https://www.guhring.com/SpeedsAndFeeds/SpeedFeed/ToolChart?toolType=Twist drills

Also on the above site they have one of the best drill/tap charts I've found.

https://www.guhring.com/Support/Technical/Tap-Drill-Sizes

There is a ton of other good information at guhring . com if you take the time to study it.

lg
no neat sig line

 

[cmandp]

I programmed the Machinerys handbook formulas into an excel spreadsheet. So as I'm coming up with a machining procedure for what I'm making I will do some calculations to find the recommended speeds for the tools I'm using.

I also have a table that has drill diameters on the left column, sfpm as you go to the right and the cross of those two gives you the rpm. I think thats what you want but I can't find it online to give you a link.

 

[matt_i]

The 100sfm is really fast if you are purchasing your own edge tools.

Take a look at an old camelback drill press running 60rpms and how many holes they can drill before the bit needs to be resharpened.

500 rpm is good for up to ~3/8" I'd run a 1/2" sub 200.