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Forum topic by ChrisBarrett posted 11-29-2020 10:12 PM 444 views 0 times favorited 16 replies Add to Favorites Watch
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ChrisBarrett

155 posts in 2031 days


11-29-2020 10:12 PM

Topic tags/keywords: makita 2040 planer motor

I have an old makita 2040 clone, that I buy 2040 parts for. Several times when running wide boards through it has shorted out the wiring going to the motor where the old insulation has melted and it’ll touch another wire or piece of metal. I went through and wrapped all the wires in higher quality electrical tape.

Recently however, the motor stopped running and was tripping the GFCI outlet without any wiring problems. I took apart the motor and one of the carbon brushes was worn down to where the braided copper wire was probably contacting the armature. Not sure if that would cause it to trip the outlet or not.

I ordered and installed new brushes and put them in, and now it will run for a minute or two and then shut off and trip the GFCI outlet again. Out of curiosity I removed the equipment ground wire from the motor housing and the motor started running again….
I put a couple boards through and the motor shut off this time without tripping the GFCI… lol.

I just ordered a new armature (hopefully they actually have one) from ereplacementparts.com, as the one in the motor is really worn down. I’m not sure if that will actually fix whatever the problem is though.

I was thinking about trying to use a induction motor – but the thought of trying to figure out how step up the rpms from 3450 to whatever the planer needs to spin at is intimidating.

Has anyone else replaced their universal motor?


16 replies so far

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MrUnix

8360 posts in 3173 days


#1 posted 11-29-2020 10:34 PM

I was thinking about trying to use a induction motor – but the thought of trying to figure out how step up the rpms from 3450 to whatever the planer needs to spin at is intimidating.
- ChrisBarrett

That’s an easy one… the listed cutter head speed is 6500 rpm, so you would just need to provide a 1:2 pulley ratio. It doesn’t need to be exact, and actually won’t ever be, since the ‘3450’ is really just a guess by the mfg and represents more of an ‘average’ speed, not absolute.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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ChrisBarrett

155 posts in 2031 days


#2 posted 11-29-2020 11:29 PM

okay, that’s cool at least. The question would be how or do I convert the existing pulley and 12mm shaft to like a pillow block with pulleys on both ends or connect a pulley directly to the induction motor and change the belt length?

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ChrisBarrett

155 posts in 2031 days


#3 posted 11-30-2020 06:27 PM

The only spare induction motor I have is a 1/2 hp craftsman that came with a lathe, probably not powerful enough. If the armature fix doesn’t work, then I’ll look at picking up a new (to me at least) induction motor and figure out how to get it to drive the belt.

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ChrisBarrett

155 posts in 2031 days


#4 posted 12-03-2020 07:11 PM

small update: I cancelled the order for the armature – i don’t think it actually existed. I just ordered a 3hp motor from amazon, long with pillow block bearings, a 12mm shaft and some v belt pulleys. I’m going to try to piece together a new transmission for the planer.

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ChrisBarrett

155 posts in 2031 days


#5 posted 12-04-2020 03:31 PM

link for the factory belt: https://beltpalace.com/450j9.html

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ChrisBarrett

155 posts in 2031 days


#6 posted 12-20-2020 11:20 PM

Okay, couple weeks later and I finished replacing the factory motor!

Parts list:
https://www.grainger.com/product/CONGRESS-3-8-in-Fixed-Bore-Standard-54XN20 – pulley – $20 shipped
https://www.grainger.com/product/CONGRESS-5-8-in-Fixed-Bore-Standard-54XN11 – pulley – $24 shippped
https://www.mcmaster.com/1482K19/ – 12mm shaft – $17.33 shipped
https://www.globalindustrial.com/product/itemKey/30914887 Wiring box for motor – $46.31 shipped
https://www.autozone.com/ignition-tune-up-and-routine-maintenance/v-belt-by-size/armormark-35in-fractional-horsepower-wrapped-v-belt/250054_0_0 – v-belt – $10
Flat stock steel bar – $13
random 3/8” bolts/nuts – $10

The rest is amazon:
https://www.amazon.com/gp/product/B000BP7WFA – switch box – $8.55
https://www.amazon.com/gp/product/B07JGZJNTB/ – 3hp 220v motor – $200
https://www.amazon.com/gp/product/B07YXNP7SP/ – 12mm pillow block bearings – $23.47
https://www.amazon.com/gp/product/B005W17FRS/ machine on/off switch – $21.34
https://www.amazon.com/gp/product/B000FKBQXA – hinges – $6.73

TOTAL: $400.73

Tools bought:
grease gun – $18.99
grease – $5.50
https://www.amazon.com/gp/product/B082D6HRKD/ – 12mm drill bit – $12.29
https://www.amazon.com/gp/product/B0002EVFJE – 13/32” drill bit – $8.70
https://www.amazon.com/gp/product/B004UUGS7A/ – 12mm die – 11.77

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ChrisBarrett

155 posts in 2031 days


#7 posted 12-20-2020 11:57 PM

https://www.youtube.com/watch?v=PGd4Ld8RlCQ

Video of it running, yes I tightened the loose bolt :)

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ChrisBarrett

155 posts in 2031 days


#8 posted 12-20-2020 11:59 PM

Picture with the switch installed

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ChrisBarrett

155 posts in 2031 days


#9 posted 12-21-2020 12:06 AM

So basic run through:

  1. Removed old motor
  2. Drilled factory grooved pulley out to 13/32 and tapped it to 12mm
  3. Drilled small v-groove pulley to 12mm
  4. made L shaped brackets out of flat 3/16” steel to mount pillow bearings to, drilled holes in appropriate places
  5. matched holes in bracket and drilled holes and tapped them in cast iron planer base
  6. drilled holes and tapped for tensioning bolts
  7. mounted pillow bearings and pulleys on shaft, tightened everything and tried to get it all aligned
  8. Cut hole through wood base for belt
  9. added wiring box to motor, wired up cord
  10. mounted motor with hinge lined up to upper pulley
  11. cut hole in base to pass cord up through the factory wiring location
  12. putzed around forever getting switch wired up and fit into a too small box
  13. Profit!

The new motor is vastly quieter than the factory motor, like probably 3x quieter. Also quite a bit more powerful, I was able to take some pretty heavy cuts that would have stalled the old motor.

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MrUnix

8360 posts in 3173 days


#10 posted 12-21-2020 04:24 AM

Wow! I imagine that thing is a beast now with a 3hp motor – be careful it doesn’t tear itself apart!

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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taxque

18 posts in 3735 days


#11 posted 01-11-2021 11:30 PM

Looks mighty involved Chris! Did the original motor have a belt and pulley that turned the cutter head? I am trying to understand why you could not just swap out the motors and had to use the pillow blocks and shaft?

-- G Heard

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ChrisBarrett

155 posts in 2031 days


#12 posted 01-11-2021 11:32 PM

The original motor was tiny, so spacing under the planer base itself was going to be difficult with a normal sized induction motor.

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ChrisBarrett

155 posts in 2031 days


#13 posted 01-11-2021 11:33 PM

Also those metal brackets I made are barely sufficient, it really needs some cnc’d aluminum or something.

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runswithscissors

3124 posts in 2999 days


#14 posted 01-12-2021 01:34 AM

I always thought the weakness of that planer was the 110/120 volt motor. Also, brushes imply a universal motor, which is typically not as robust as an induction motor.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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taxque

18 posts in 3735 days


#15 posted 01-13-2021 02:34 AM

OK thx. So how many pulleys and belts are there in all now? Do you have picture showing that part of the set up. I ham looking at buying a used one and from sound of things the motor needs to be replaced all though the demo boards he ran through the planer look good. I am waiting to see what kind of price I am given as that may kill the deal anyway.

-- G Heard

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