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Thread: Wood lsthe VFD conversion
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16th Sep 2021, 04:15 PM #1Most Valued Member
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Wood lsthe VFD conversion
Picked up an the old 3ph woodfast lathe sometime back and its finally found some space in the shed.
Fitted a vfd.
What i like about this VFD is that it can convert hertz to theoretical RPM for the display with some simple programming of theoretical driven shaft rpm.
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Just need to fit perspex cover and black all the areas one doesnt want to see.eg wiring
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16th Sep 2021, 04:32 PM #2Member: Blue and white apron brigade
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The old wood fasts are nice bits of gear.
What happens if you need to change the pulleys?
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16th Sep 2021, 05:52 PM #3Most Valued Member
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Hoping I dont have to change speeds via pulley. At 110hz the spindle gets up to calculated 3619rpm.
Inverter has sensorless vector so hoping it will have enough torque for turning at lower speeds.
Any lower will only be for polishing anyways.
But if I need to get more torque I change pulley ratio and adjust vfd to suit theoretical speed.
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16th Sep 2021, 10:00 PM #4Member
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There's a general rule of thumb that says multiply the rpm by the diameter of the wood (in inches) and the result should be in the range of 6000 to 9000. If the wood is out of balance will have to start at a lower speed until it is evened up.
You can work out your pulley ratios based on what you are likely to turn.
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17th Sep 2021, 11:05 AM #5Most Valued Member
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17th Sep 2021, 02:20 PM #6Member
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