Brushless Makita mod

Do these routers have a soft-start? I’ll bet they do, as even the Ryobi brushless vac I have has a soft-start.

But if not, and the fuse blows when you turn the router on, then you might want to bypass the leads of the DMM until the router is up to speed, then remove the bypass.

You could also try a slow blow fuse also. I doubt 10amps would be drawn at startup except under extreme load.

The router’s motor controller draws periodic current bursts rather than a fixed constant draw like a passive load (resistor, etc.) would. So, your approach won’t work.

Sadly I do not have any makita batteries on hand.

@Lewscrew by dc shunt do you mean an Rc filter circuit? I was told that might do the trick.

The power supply shows t6.3 slow blow on the board. It’s hard soldered in but I should make the next one replaceable.

The meter also has a min/max, so it should provide max or peak draw.

For a general baseline indication it should work fine. IMO, sounds like Vince has an adequate power supply and has not had any critical failures. At this point for Vince’s requirement is testing current to validate his power supply is adequate.

The approach depends on how specific and accurate you want to be and how much money and time one wants to invest. Others may be set up better than Vince to do some of the testing recommend in this thread.

Vince,
If you search for DC shunt Resistor for Ammeter this should help point you in the right direction. You would only require a shunt Resistor in series with the motor, then measure the voltage drop across the Resistor and calculate current using ohm’s law.

Using min/max readings on your meter, this should give you an indication of peak current.

Hope this helps

WADR (did I make that one up?) you’re 100% wrong. Trust me or learn more about it yourself (it’s not “rocket science”), but please don’t direct Vince and others down that “rabbit hole”!

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Vince, Griff

Please don’t give up on your efforts. As others have pointed out, the brushless Makita router is likely not as powerful as the 0701. But it may be adequate and could offer numerous other advantages.

If you tell me what the resistances of the routers’ motor windings are, I should be able to provide an estimate of their relative power capabilities. (Which you should also be able to do with your cutting tests if they’re router power limited.) That would also enable me to provide advice on powering the brushless routers.

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I haven’t given up. Truth is, it works fine.

While interesting, I don’t really care how much power it requires etc etc. Just not my thing.

I’ve hogged out inch thick aluminum with a 3/8” TAS, 6mm doc. I’m currently doing full depth (1”) adaptive in red oak, no issues.

The router is not grounded as was my DeWalt. No static problems yet, humidity these past few weeks as low as 5%.

Under heavy load I can hear the router slow down a bit so the power supply may be a little light, we’ll see. If I smoke the cheap ps at some point I’ll report and maybe upgrade to a Mean Well.

The original question in the thread is answered. Thanks to @Vince.Fab.

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At the risk of exposing my ignorance to the derision of others, I’ve no idea how to accomplish that. This is the extent of my electrical test equipment. I’ve not yet learned how to use the inductance/capacitance meter, it’s on my ever growing list though.

Throw some hints my way and I’ll see what I can do.

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Griff,

IMO derision is counter productive, but I’m not a Trump supporter!

This should help. Make sure that you have the power disconnected first! Please ask if you have any questions or concerns.

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Cutting power is dictated by the characteristics of the material being cut and the volume and speed of its cutting. The axial (depth) and radial (width) of the cut along with the feed rate and material type would be really helpful to those of us interested in such things. Knowing the router speed and cutter details would also enable calculations of machine forces and chip loads. That info could be really helpful in the production of better “speeds and feeds” as well as other usage guidance for the Shapeokos.

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This experiment isn’t over until we find the limits of this router! This is the only low cost option for a brushless that’s 30Krpm capable . Going to pick up a few Destiny Diamondbacks tomorrow for continued testing, they assured me the 3/8s will survive at 30k…almost $50 each.

The 360 watt power supply was enough to push 0.250 through anything I could throw at it. Hopefully the new 20amp unit i recieved today will do the trick for bigger tooling.

Griff, one of my cnc operator buddies always told me you want enough load to hear a difference when cutting. If you aren’t blowing that fast acting fuse I think it’s fine. Im going to find a suitable fuse holder to solder into the board just in case.

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It’s interesting that neither of us have experienced the smoke and destruction predicted early in the thread :roll_eyes:.

Possibly the XTR01 isn’t rated at 1.25 hp, the basis of the smoke prediction? I’ve never seen any hp rating for it.

Anyway, I’ve a few more hours on mine, albeit not pushing the limits, no issues at all.

Got some larger black walnut projects in the works, will start pushing then.

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It looks like a solid option that I will likely use in future. Thanks for being pioneers for the rest of us!

A lot of predictions of smoke and death early on… that usually means you’re onto something good!

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Vince,Griff
Got numbers!?

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This weekend I put in the brushless and ran it pretty hard. 8mm Datron single flute


Actually stalled it when trying to cut like a corded Makita, dialed back 20ish%

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Cool! Why that K factor? Thanks for using the workbook!

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