Changing RPM on a power tool using a dimmer switch?

Question

I own a portable power planer but ideally need to adjust the cutter rotation speed. As far as I know all portable planners are fixed with just one speed setting but I have been told that it's possible to change the speed by using a dimmer switch. Essentially cutting the power cable and wiring in the dimmer switch. This probably sounds quite dangerous which is why I would probably get an electrian to do the job if it can be done.

Answer 1

No, not a good idea if you value your planer as it will burn out the motor for sure.

I am not sure I see the value in slowing the revs on a planer as there are power tools for every job these days. You may be just using too big a tool for the job.

What are you trying to do?

Answer 2

Bad idea, especially if the planer motor is expecting 120 VAC. You runt he risk of overheating/buring out the motor.

You can look for a Variable Frequence Drive (a specialized electronic itme that alters the frequency of the power) However the VFD maynot be suitable for your particular motor.

Look on the data plate for the motor and contact the manufacturer.

May I ask why you want to slow down the planer speed?

Regards,

Eric

Answer 3

I too am puzzled about why you want to alter (reduce) the cutting speed of your planer. After all the rpm has been arrived at by the maker at the design stage to be the optimum.

Slowing it down may cause problems of finish or control that were not there before.

Sharp blades and small depths of cut produce good finishes. What else would you want?

Answer 4

Power tools in general and planers in particular are designed to run at full speed, trying to lower that speed will damage the tool and, also, produce a terrible finish. Those tools made for variable speeds (e.g. drills) have their own specific circuitry built in.

A dimmer switch is built to handle light-weight (sorry about the pun) power demands as found in a lighting circuit, not the full-on demands of a power tool.

You need to consider why you want to drop the speed.  Are you using the right tool for the job?

Answer 5

It is possible, but check the rating of the dimmer switch.

A dimmer designed for a 100W lightbulb won't be any good for a 750W power planer.

Answer 6

yeah agreed in theory it would work but most light dimmers would have a hard time handling the power of a tool like this. It might also be hard on the tool operating on a lower power source then designed for.....I would doubt a certified electrician would take the job unless he was a Friend of yours. No one should want to take on that risk......