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All Replies on Makita Belt Sander Sparking in Armature?

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Makita Belt Sander Sparking in Armature?

by DMiller
posted 08-21-2017 05:08 PM


19 replies so far

View splintergroup's profile

splintergroup

3007 posts in 1764 days


#1 posted 08-21-2017 05:12 PM

Is it the motor brushes?

They could be reaching their end of life or are gummed up in their slots and sticking.

View MrUnix's profile (online now)

MrUnix

7505 posts in 2741 days


#2 posted 08-21-2017 06:05 PM

Yup, check your brushes… a replacement set is under $10

If they look in good shape, then you may need to pull things apart and clean up the commutator (also a good time to check the condition of the bearings while you have it apart).

Cheers,
Brad

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

View DMiller's profile

DMiller

517 posts in 1015 days


#3 posted 08-21-2017 07:17 PM

Thanks, both of you for the replies. Is it possible to replace/ clean the brushes myself or would I need to take it to a repair center? How difficult are they to replace/ clean? Thanks for the replies….DMiller

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

View MrUnix's profile (online now)

MrUnix

7505 posts in 2741 days


#4 posted 08-21-2017 07:32 PM

Thanks, both of you for the replies. Is it possible to replace/ clean the brushes myself or would I need to take it to a repair center? How difficult are they to replace/ clean? Thanks for the replies….DMiller
- DMiller

To check/replace them, all you need is a screwdriver (See page 6 of your manual under “Maintenance”).

Cheers,
Brad

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

View Ripper70's profile

Ripper70

1345 posts in 1450 days


#5 posted 08-21-2017 07:34 PM

It’s not too difficult to replace the brushes and for the effort would be worth it rather than cleaning them. There’s a schematic pictured here and replacement parts are about $8.00. You might find them on eBay as well and possibly pay less for shipping.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

View splintergroup's profile

splintergroup

3007 posts in 1764 days


#6 posted 08-21-2017 09:34 PM

Now that is service Brad 8^)

I agree with the idea of taking the unit apart if you have the basic skills and know how to catch hidden parts that like to leap from within when set “free”. It’s nice to inspect the motor, clean out the crud and give the bearings a spin and feel for smoothness.
If you can shine a light on the commutator (the copper looking part that the brushes ride against) when you have the brushes out, look for grooves and/or signs of arching/melting. If your brushes are truly down to the springs. the commutator could have rough spots that will eat up a new set of brushes. To the contrary, if the old brushes still have some carbon left and the faces look smooth, you commutator should be ok

View Jim Jakosh's profile

Jim Jakosh

23552 posts in 3647 days


#7 posted 08-21-2017 11:51 PM

It sound like the brushes are worn down. It would be nice if you can get that armature out and polish the commutator down for the new brushes to ride more smoothly, too.

I have a D handle Makita router and I had to cut off the cord a bit and move it up because the wire broke where it was bent a lot. I was truly amazed at how easy it is to work on a Makita tool compared to the likes of Harbor Freight. The wiring has lots of room and it assembles back so easily!

cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View DMiller's profile

DMiller

517 posts in 1015 days


#8 posted 08-22-2017 01:15 AM

Thanks for the replies, guys! So using a flashlight iv’e checked the brushes… from what I can tell the have about 1/10 in. (3 mm) of carbon left on the brushes; how much should they have normally? Splintergroup, when you say ‘knowing how to catch hidden parts that like to leap from within when set free,’ is this meaning how to get the brushes back onto the armature? I have messed around with some comparable sized motors trying to put the brushes back on the armature after taking them apart, and have found it quite difficult… is there any easy way to do it? To be honest, i’m not sure I would say I have basic skills in repairing motors, I think I understand the concept of how they work, but for me its a totally different story when its actually apart. What do you guys think about trying to repair it myself? I really appreciate your advice and time! Thanks!

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

View MrUnix's profile (online now)

MrUnix

7505 posts in 2741 days


#9 posted 08-22-2017 02:13 AM

So using a flashlight iv e checked the brushes… from what I can tell the have about 1/10 in. (3 mm) of carbon left on the brushes; how much should they have normally?
- DMiller

Using a flashlight??? Pull them out and look – no flashlight needed. If you read the manual, it shows how to tell if they need to be replaced… here is the relevant bit:

1/10th of an inch sounds like they are way past time for replacement… pull them and see.

Cheers,
Brad

PS: You can see the limit line on the picture I originally posted above (from ereplacements). That should give you an idea of what is acceptable.

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

View DMiller's profile

DMiller

517 posts in 1015 days


#10 posted 08-22-2017 02:39 AM

Thanks for the help Brad; I would have checked the owners manual, but I bought the machine a few years ago used and it did not come with the manual. Thanks for the help- couldn’t do it without LJ’s!

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

View MrUnix's profile (online now)

MrUnix

7505 posts in 2741 days


#11 posted 08-22-2017 02:47 AM

Thanks for the help Brad; I would have checked the owners manual, but I bought the machine a few years ago used and it did not come with the manual.
- DMiller

Follow the link I gave you above to the manual – that is one of the first things you should have done when you got the machine!

Cheers,
Brad

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

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DMiller

517 posts in 1015 days


#12 posted 08-22-2017 04:03 AM

Thanks Brad- I checked it out! I now get what you mean about “using a flashlight???” I was thinking you had to take the whole machine apart to replace the brushes till I realized how easy it is to replace them from the side. My brushes still have 3/8 in. left of wear on the bar so as of now I probably won’t replace them. Do you happen to know what else may be causing it to spark? Thanks- I really appreciate your help! DMiller

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

View MrUnix's profile (online now)

MrUnix

7505 posts in 2741 days


#13 posted 08-22-2017 04:38 AM

Well, brushed motors spark… it’s the nature of the beast. If it has become excessive, it could be caused by a number of different things… dirt or grime preventing the brushes from making full contact, springs going bad and not providing enough pressure, carbon build-up on the commutator or being worn down, fault in the armature, etc… hard to tell without having it sitting in front of me. I would eliminate the brushes first… make sure the holders are clean and the brushes can move freely in them, and maybe reverse them and running it for a while to see if that helps. If not, I’d pull it apart and check the commutator, armature windings and bearings.

Cheers,
Brad

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

View MrUnix's profile (online now)

MrUnix

7505 posts in 2741 days


#14 posted 08-22-2017 04:53 AM

Wait a minute… I just noticed that in the title, you say it is “Sparking in Armature”. Where exactly is it sparking… at the commutator where the brushes ride, or in the armature windings? I think we all have been going on the assumption that it’s the former, not the latter…

Cheers,
Brad

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

View Richard Lee's profile

Richard Lee

256 posts in 1317 days


#15 posted 08-22-2017 02:33 PM

I had a Makita Router that was sparking,changed brushes,cleaned commutator same problem.
Turns out it was a short or a problem internaly in the windings. Tossed it and got another.

View splintergroup's profile

splintergroup

3007 posts in 1764 days


#16 posted 08-22-2017 02:55 PM



Thanks for the replies, guys! So using a flashlight iv e checked the brushes… from what I can tell the have about 1/10 in. (3 mm) of carbon left on the brushes; how much should they have normally?

Time to replace. Standard lengths vary, but I’d expect at least 1/4” and up to 1/2”


Splintergroup, when you say knowing how to catch hidden parts that like to leap from within when set free, is this meaning how to get the brushes back onto the armature? I have messed around with some comparable sized motors trying to put the brushes back on the armature after taking them apart, and have found it quite difficult… is there any easy way to do it?

It was just a general statement. It seems like whenever I take apart a tool, the biggest grief comes not from the part I’m replacing, but the flying snap rings and trigger springs that shoot out and get lost in the shop.

Brushes that are accessed through screw caps on the exterior of the tool usually are the easiest to deal with, just unscrew the cap, pull out the brush, insert new brush replace cap while compressing the spring and keeping it aligned. The interior access type usually require disconnecting wires and futzing with tiny screws.


To be honest, i m not sure I would say I have basic skills in repairing motors, I think I understand the concept of how they work, but for me its a totally different story when its actually apart. What do you guys think about trying to repair it myself? I really appreciate your advice and time! Thanks!

- DMiller

Personally I think if you have a basic understanding of things like bearings and such, you should have the ability to take apart a tool and put it back together. Every kid I ever knew learned about these things by actually just doing it. If you don’t try, you never learn 8^)

Keep things organized, take pictures as you disassemble if things get complicated, understand how to put the last part back together before you disassemble the next part.

Best thing probably would be to just swap in the new brushes and see if that fixes it. You can’t really do any additional harm .

View DMiller's profile

DMiller

517 posts in 1015 days


#17 posted 08-22-2017 05:59 PM

Thanks for the replies, all of you! Splintergroup, I did figure out you access the brushes from the outside screw caps. What do you guys think, replace them or just try to clean them? I’m not sure if I previously mentioned it, but the sparking is occasional, sometimes it sparks and other times it doesn’t. I’d say 50% of the time it sparks, 50% it doesn’t. Thanks- I value your opinion!

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

View Richard Lee's profile

Richard Lee

256 posts in 1317 days


#18 posted 08-22-2017 10:55 PM

I had a Makita Router that was sparking,changed brushes,cleaned commutator same problem.
Turns out it was a short or a problem internaly in the windings. Tossed it and got another.

View DMiller's profile

DMiller

517 posts in 1015 days


#19 posted 08-23-2017 01:53 PM

Thanks for the heads up, Richard! If my sander is having the same problem as your router, as of now I will probably just run it to is death or as long as it is ‘safe’ to operate. Thanks for the replies! DMIller

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

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