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Makita MT M3600B & VFD drive

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Forum topic by dinu posted 08-30-2018 04:32 AM 579 views 0 times favorited 5 replies Add to Favorites Watch
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dinu

6 posts in 754 days


08-30-2018 04:32 AM

Topic tags/keywords: router question vfd speed control

Hi,

Has anyone used makita MT series M3600/M3600B routers? This is a low cost 1/2 inch fixed speed router. I have not been able to find much information on net except couple of unboxing videos. I would appreciate any feedback on this.

Also, is it a good idea to control speed of a router using vfd drives?

Any advice or pointer is very welcome.


5 replies so far

View bigblockyeti's profile

bigblockyeti

5776 posts in 2135 days


#1 posted 08-30-2018 12:00 PM

A universal motor (like that found in the Makita router) cannot be controlled with a variable frequency drive motor controller. Routers and other tools powered by variable speed universal motors that have to maintain speed use a built-in tachometer to allow an increase in power to the motor when a load is applied and decrease when the load is removed.

-- "Lack of effort will result in failure with amazing predictability" - Me

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Scap

78 posts in 342 days


#2 posted 08-30-2018 12:24 PM



A universal motor (like that found in the Makita router) cannot be controlled with a variable frequency drive motor controller. Routers and other tools powered by variable speed universal motors that have to maintain speed use a built-in tachometer to allow an increase in power to the motor when a load is applied and decrease when the load is removed.

- bigblockyeti

So no VFD, but what about an SCR speed control?
Not trying to highjack, just want to get my brain wrapped around this whole universal versus induction motor thing.

All of my field experience is with larger three phase motors, so thinking in terms of single phase and universal is stripping my gears.

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bigblockyeti

5776 posts in 2135 days


#3 posted 08-30-2018 12:28 PM

SCR is basically what’s use in most variable speed drills, it can certainly work but wouldn’t offer feedback to be able to maintain speed like many (if not all) variable speed routers currently available.

-- "Lack of effort will result in failure with amazing predictability" - Me

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Scap

78 posts in 342 days


#4 posted 08-30-2018 01:06 PM



SCR is basically what s use in most variable speed drills, it can certainly work but wouldn t offer feedback to be able to maintain speed like many (if not all) variable speed routers currently available.

- bigblockyeti

Ah, that makes sense. Thank you.

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dinu

6 posts in 754 days


#5 posted 08-31-2018 01:05 PM



A universal motor (like that found in the Makita router) cannot be controlled with a variable frequency drive motor controller. Routers and other tools powered by variable speed universal motors that have to maintain speed use a built-in tachometer to allow an increase in power to the motor when a load is applied and decrease when the load is removed.

- bigblockyeti

Thanks for the clarification. So vfds are out. Could u pls explain a bit more (for a layman) how do variable speed router work? what does it change (voltage, line frequency etc)? and how does it compensate for speed drop on load ? asking because i was wondering if there is a way to do something similar externally based on external tachometer reading. The topic may be too complicated for a electronics layman like me to fully understand but whatever pointer you can give would be great.


SCR is basically what s use in most variable speed drills, it can certainly work but wouldn t offer feedback to be able to maintain speed like many (if not all) variable speed routers currently available.

- bigblockyeti

I have started reading about SCRs. They appear to be easily available and cheap. Again wondering if there is a way to feed extarnal tachometer reading into scr or some thing similar.

Thanks a lot for taking your time out to help me.

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