[How-To] Tap Speed & Feed Calculator

JPT

JPT

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I put together a Google Sheets spreadsheet to automate Tapmatic's tapping recommended speeds & feeds, RPM adjustment factors, minimum required torque & horsepower, etc.

The spreadsheet is here:
https://docs.google.com/spreadsheets/d/16MPFCAvBzhTM1Sc9MnQwcvhcceaTQ26m7MhIoyBVxJk/edit?usp=sharing

That is a shared spreadsheet that anybody with the link can use at the same time, which makes it not very useful for calculating speeds and feeds for your job.

To make a copy for yourself to use on your projects:
  1. On the menu bar at the top, select "File"
  2. From the dropdown menu, select "Make a copy"
  3. If desired, change the name
  4. Select the "Make a copy" button

To use:
  • Enter your choices and values in the green cells
  • If the RPM cells are red due to an RPM limit, use a manually entered RPM

I welcome any feedback, especially on errors or ways to improve it.
 
Note for Excel users: If you prefer to use it in XL, the file created by the Google Sheets download will break all of the FILTER functions.

To fix the XL file:
  1. Open the file in XL
  2. Enable editing
  3. Unhide tab "lookup-data-4"
  4. Do a search for DUMMYFUNCTION
  5. In the entire workbook, replace the DUMMYFUNCTION with an XL FILTER function using the same ranges and values:
  6. Tab "lookup-data-4" C5: =FILTER('lookup-data-1'!$H$6:$H$124, 'lookup-data-1'!$B$6:$B$124='Tap Speed & Feed'!$C$13)
  7. Tab "lookup-data-4" B5: =UNIQUE('lookup-data-1'!$B$6:$B$124)
  8. Tab "Tap Speed & Feed" H13: =FILTER('lookup-data-3'!$C$8:$C$21, 'lookup-data-3'!$B$8:$B$21='Tap Speed & Feed'!$C$12)
  9. Tab "Tap Speed & Feed" H14: =FILTER('lookup-data-3'!$D$8:$D$21, 'lookup-data-3'!$B$8:$B$21='Tap Speed & Feed'!$C$12)
  10. Tab "Tap Speed & Feed" H33: =FILTER('lookup-data-3'!$E$8:$E$21, 'lookup-data-3'!$B$8:$B$21='Tap Speed & Feed'!$C$12)
  11. Tab "Tap Speed & Feed" H34: =FILTER('lookup-data-3'!$F$8:$F$21, 'lookup-data-3'!$B$8:$B$21='Tap Speed & Feed'!$C$12)
  12. Tab "Tap Speed & Feed" I52: =FILTER('lookup-data-1'!E$6:E$124, 'lookup-data-1'!H$6:H$124='Tap Speed & Feed'!$C$14)
  13. Tab "Tap Speed & Feed" I53: =FILTER('lookup-data-1'!F$6:F$124, 'lookup-data-1'!H$6:H$124='Tap Speed & Feed'!$C$14)
  14. Tab "Tap Speed & Feed" I55: =FILTER('lookup-data-2'!N$5:N$123, 'lookup-data-2'!H$5:H$123='Tap Speed & Feed'!$C$14)
  15. Tab "Tap Speed & Feed" I56: =FILTER('lookup-data-2'!O$5:O$123, 'lookup-data-2'!H$5:H$123='Tap Speed & Feed'!$C$14)
  16. Tab "Tap Speed & Feed" I57: =FILTER('lookup-data-2'!I$5:I$123, 'lookup-data-2'!H$5:H$123='Tap Speed & Feed'!$C$14)
  17. Tab "Tap Speed & Feed" I58: =FILTER('lookup-data-2'!J$5:J$123, 'lookup-data-2'!H$5:H$123='Tap Speed & Feed'!$C$14)
 
Thanks for sharing. I'm green enough that I don't really have much of a comment.

The only thing that I can say is that when I put in a M4-0.7 the spread sheet says I should be tapping between 3,183 and 4,775 RPM with a coated tap. HOLY COW! I'm not even sure my lathe or mill for that matter will turn that fast. I may not understand it, but I machine tap at well under 100 RPM. I'm not saying I do it right, that's just the way I do it.

Tim
 
JPT said:
I put together a Google Sheets spreadsheet to automate Tapmatic's tapping recommended speeds & feeds, RPM adjustment factors, minimum required torque & horsepower, etc.

The spreadsheet is here:
https://docs.google.com/spreadsheets/d/16MPFCAvBzhTM1Sc9MnQwcvhcceaTQ26m7MhIoyBVxJk/edit?usp=sharing

That is a shared spreadsheet that anybody with the link can use at the same time, which makes it not very useful for calculating speeds and feeds for your job.

To make a copy for yourself to use on your projects:
  1. On the menu bar at the top, select "File"
  2. From the dropdown menu, select "Make a copy"
  3. If desired, change the name
  4. Select the "Make a copy" button

To use:
  • Enter your choices and values in the green cells
  • If the RPM cells are red due to an RPM limit, use a manually entered RPM

I welcome any feedback, especially on errors or ways to improve it.
Click to expand...
It is surprising how fast you turn a tap.
If automatic tapping you go that fast.
For few holes I just chuck tap in drill chuck and use for safety cluck too and put drill press on the slowest speed.
Note I turn off motor as tap gets close to part so I have control and mat tap power a little.

Marry Christmas
Dave
 
As a young apprentice, I figured that (theoretically) you could run a tap as fast as any other HSS cutting tool. I was running a batch of CRS parts with a bunch of 1/4-20 tapped holes. I was drilling and tapping at 1200 rpm, throwing the mill into reverse when the tap got within three threads of the end. I never broke a tap, but I nearly gave Fred a heart attack. I'm more conservative now.
 
Thanks for sharing!
 
MrWhoopee said:
As a young apprentice, I figured that (theoretically) you could run a tap as fast as any other HSS cutting tool. I was running a batch of CRS parts with a bunch of 1/4-20 tapped holes. I was drilling and tapping at 1200 rpm, throwing the mill into reverse when the tap got within three threads of the end. I never broke a tap, but I nearly gave Fred a heart attack. I'm more conservative now.
Click to expand...
My favorite mistake is to to leave the quill stop at about the halfway mark on the tap and see what gives up first.

I do this for science. Thats what I tell my coworkers anyway.
 
I fixed an error in the spreadsheet.

The feed and retract rates were labeled incorrectly.

I corrected them to:
Feed rate (mm/Min)
Retract rate (mm/Min)
Feed rate (inch/Min)
Retract rate (inch/Min)
 
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