Simple drill chart rpm

[fizzy]

Does anyone have a link?
Whilst I am quite capable of working out the maths I just want a simple chart!
Most of us do not need feed rates as we are doing it by hand.
Just a simple chart to show rpm for a given size drill bit - in a few different materials.
Tried googling it and nothing quite right. Either imperial only or too basic.
Anyone got a favourite they can share?

 

[gaz1]

just search for drill bit speed chart fizzy on google

 

[fizzy]

just search for drill bit speed chart fizzy on google

View attachment 223073 View attachment 223074

I did see those - first one ok ish but 2nd is imperial.
The first one is a bit too broad a range on sizes.

 

[fizzy]

https://www.imperialsupplies.com/pdf/I_Drill-Bit_PRMChart.pdf

Something like this but metric is what I would like

 

[jerrytug]

That's useful thanks. And it prompts the question: why haven't all drills, from Meddings to Makita, got tacho's, so we don't have to guess the RPM..

 

[cheb]

There's been a chart on the side on all the proper drill I've seen. The middle of a five pulley is a 1 to1 ratio on mine.

 

[rtcosic]

How do I post a pdf?
I have a drill speed chart I drew up years ago for:

Stainless @ 4m/min
Cast Iron @ 10m/min
Alloy Steel @ 15m/min
Mild Steeil @ 30m/min
Brass @ 40m/min
Aluminium @ 70m/min

rounded to 25rpm for 2-16mm drills.

Also default settings for 4.6, 8.8, 10.0 & 12.9

Separate conversion chart in 64ths to decimal inches and mm

 

[gaz1]

you cant you need to upload it to a site then post a link on the forum

 

[rtcosic]

Problem solved - rescanned as jpeg

scruffy but legible.

Now I can't find the original spreadsheet.

 

[gaz1]

you can also use windows snipping tool as well does the same thing

 

[willie.macleod]

Hi Vince, try this chart - designed for school workshops:

https://www.sserc.org.uk/wp-content/uploads/2011/12/drill-speed-chart.pdf

 

[eLuSiVeMiTe]

Purely a test

PDF

Edit. Yup. Was sure I'd uploaded PDFs and similar with no issues

 

[Arclikeharrypotter]

All very precise if you ask me! I've only got 10 speeds on the drill, and I'm manually feeding anyway. You'll soon realise if you're running to fast or too slow.

 

[eLuSiVeMiTe]

All very precise if you ask me! I've only got 10 speeds on the drill, and I'm manually feeding anyway. You'll soon realise if you're running to fast or too slow.

Lol yup
Big holes I go slow. Small holes I go fast ..

Feed and lube are my main priority

 

[Arclikeharrypotter]

Yeah exactly that @eLuSiVeMiTe if I was running something a bit more sophisticated than an old pillar drill I might try and match the numbers up. Now I just pay attention to how the drill is cutting.

 

[rtcosic]

How? When I tried to upload a file with 'All Supported Files' - the only option - it only showed the JPEGs in the folder I had selected.

 

[rtcosic]

Lol yup
Big holes I go slow. Small holes I go fast ..

Feed and lube are my main priority

But I have a shiny new VFD and 4 pulley sets so can run from 48 to 6480 rpm so I MUST know EXACTLY what speed to use!

 

[eLuSiVeMiTe]

How? When I tried to upload a file with 'All Supported Files' - the only option - it only showed the JPEGs in the folder I had selected.

Just click show all. Doesn't have to be supported. Will open with a third party app.

I just chose it from the downloads folder I. My phone