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4th April 2007, 08:47 AM #1
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Lathe RPM for Roughing or Finishing
I found this on Emule under the title "Woodworking - Lathe-RPM Chart.pdf". What you see is what there is, no names, no attributions so i am unable to give a source.
Are the figures right and is it a usable chart?
Lathe RPM for Roughing or Finishing
I found this chart on another website. It is just a suggestion.You may want to turn at a different speed. The formulas are below.
<table> <tbody> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> Turning Diameter (inches)
</td> <td style="border: 1px outset rgb(0, 0, 0);"> Roughing RPM
</td> <td style="border: 1px outset rgb(0, 0, 0);"> Finishing RPM
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 2
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 1500
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 3000
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 4
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 800]
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 1600
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 6
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 500
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 1000
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 8
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 400
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 800
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 10
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 300
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 600
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 12
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 250
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 500
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 14
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 225
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 450
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 16
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 200
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 400</td></tr></tbody></table>
The roughing surface speed is 160 inches/second.
The finishing surface speed is 320 inches/second.
The formulas are: Roughing RPM = 160/(PI*Diameter)*60
Finishing RPM = 320/(PI*Diameter)*60
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4th April 2007, 04:43 PM #2
Dances with splinters
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It more or less falls in in line with other charts I've seen. The speeds seem reasonable and I'd say are quite usable... but "right" is a matter of personal opinion. eg. I've had a chart up on the walls of my shed for several years now, that has the following on it:
Faceplate:
<table> <tbody> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> Stock Size
</td> <td style="border: 1px outset rgb(0, 0, 0);"> RPM for >2" thick
</td> <td style="border: 1px outset rgb(0, 0, 0);"> RPM for <2" thick
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> <8"
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 1000
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 750
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 8"-12"
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 750
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 750
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> >12"
</td> <td style="border: 1px outset rgb(0, 0, 0);"> slowest avail
</td> <td style="border: 1px outset rgb(0, 0, 0);"> slowest avail
</td> </tr> </tbody></table>
Spindles:
<table> <tbody> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> Stock Size
</td> <td style="border: 1px outset rgb(0, 0, 0);"> RPM for <24" length
</td> <td style="border: 1px outset rgb(0, 0, 0);"> RPM for >24" length
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> <2½"
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 2000
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 1500
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> 2½"-4"
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 1500
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 1000
</td> </tr> <tr> <td style="border: 1px outset rgb(0, 0, 0);"> >4"
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 1000
</td> <td style="border: 1px outset rgb(0, 0, 0);"> 750
</td> </tr> </tbody></table>
As you can see it's a bit hard to make a direct comparison with yours.
Apart from a couple of times when I first posted it to the wall, I've totally ignored it!
I've found that the type of wood and the type of cut dictates the speed more than the dimensions.
I'm more of the school of thought: "crank it up until it vibrates, then back off a notch or two." There are obvious exceptions (obvious at the time, that is... punky wood, etc) but any "rule" can only be general, eh?
- Andy Mc
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4th April 2007, 04:48 PM #3
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Thanks Tas, but I rather do agree with Skew on the "speed up 'till it shakes, and slow down a bit".
-- Wood Listener--
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4th April 2007, 06:06 PM #4
You've got to risk it to get the biscuit
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thats what i do to...
Originally Posted by Gil Jones
anyway, tas's table seems pretty good
cheersS T I R L O
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