DIA to RPM chart

If 6 tables don't fit one page...
You need to adjust your printing scale:
Firefox
  1. File
  2. Print Preview
  3. Select a scaling from the dropdown list next to 'scale' until you see that 6 tables will fit one page.
  4. print it
IE
  1. File
  2. Print Preview
  3. change the scaling in the drop down list at top right (or press ALT+S)
  4. print it

Although there is a program for calculating spindles speeds according to diameter and material, I found it handy to produce a chart that can be stuck up in the workshop. Using the form below you can generate a chart for your lathes set of spindle speeds.

I have attempted to force a page break after 6 material tables, and I have tested the printout in Firefox 3 and IE 7. Both produce readable output in portrait mode on an HP laser printer with up to 14 rpm entries.

You need to enter the speeds your lathe can do below.
Enter the speeds in RPM, one per line, no blank lines, numbers only, no text.

example: ML7 speeds are example: Super 7 speeds are
35 
62 
110 
200 
357 
640 
       
27 
39 
54 
77 
95 
135 
210 
300 
420 
600 
740 
1050 
1480 
2105 
Data:



Data used for the calculations:

MaterialHSSCarbide
Copper 60-80 sfm  
Aluminum 300-800 sfm 1000-2000 sfm
hard Bronze 65-130 sfm 200-400 sfm
Brass + Soft Bronze 200-400 sfm 500-800 sfm
Med Carb Steel 50-80 sfm 225-400 sfm
Low Carb Steel 80-150 sfm 300-600 sfm
Stainless Steel 30-80 sfm 100-300 sfm
High Carb Steel 40-70 sfm 150-250 sfm
Malleable Cast Iron 80-90 sfm  
Gray Cast Iron 50-80 sfm 250-350 sfm
Medium Cast Iron 70-100 sfm  
Soft Cast Iron 100-150 sfm  
Hard Cast Iron 40-60 sfm  
Plastic 200-3300 sfm  

Note: the plastic cutting rate figures are tentative, I will try to refine the values shortly

For more comprehensive calculations see
http://www.custompartnet.com/calculator/milling-speed-and-feed
http://en.wikipedia.org/wiki/Spindle_speed


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Last modified: July 03 2015 11:19:42.