Are Armature's interchangeable?

[_gear2]

Long story short I need to replace (or have rewound) the armature on 8050 makita rotary hammer. Because of the age of this unit I can no longer get a replacement armature. I don't know the inner working of electrical motors but have swapped in replacement parts numerous times and have found an armature from a Makita circular that has all the same dimensions. Would this work or is there something other than the size of the different components that needs to be taken into consideration?

Cheers.

 

[IUEC Medic]

Long story short I need to replace (or have rewound) the armature on 8050 makita rotary hammer. Because of the age of this unit I can no longer get a replacement armature. I don't know the inner working of electrical motors but have swapped in replacement parts numerous times and have found an armature from a Makita circular that has all the same dimensions. Would this work or is there something other than the size of the different components that needs to be taken into consideration?

Cheers.

Without knowing the exact specs of the armature windings, you’re essentially just guessing. Physical dimensions mean very little.

How exactly did you determine that the armature failed? Are the windings shorted/grounded?

Unfortunately it may be time for a new roto hammer.

 

[6PTsocket]

Pull up the parts lists for both tools and see if the armature has the same part number. You can find parts lists on online, factory sites, e replacemt, etc. Call Makita if all else fails. There is nothing mystical about an armature. If it has the same number of commutater segments, looks to be the same wire gauge, mechanical dimensions are the same, I woold give it a shot but that's me. Did you look for obvious stuff on the old one like commutor contacts that need cleaning, shot brushes, bad trigger, bad power cord, etc.

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[bob15]

Do you have the armature part number? Have you looked on e-bay, both current and complete auctions?

 

[OccupantRJ]

May be reverse rotation. Compare part numbers. A friend bought a miter saw off CL, plugged it in to see if it ran, then later discovered it ran backwards. He had to buy a different armature for it. Apparently the previous owner replaced the armature, discovered the problem, then sold it to an unsuspecting soul from under his carport where there was no wood to cut.

 

[6PTsocket]

May be reverse rotation. Compare part numbers. A friend bought a miter saw off CL, plugged it in to see if it ran, then later discovered it ran backwards. He had to buy a different armature for it. Apparently the previous owner replaced the armature, discovered the problem, then sold it to an unsuspecting soul from under his carport where there was no wood to cut.

Considering that brushed motors are often reversable I don't think there is any such thing as a CW or CCW armature. Just flipping the brush connections reverses the rotation. Almost every brushed drill does it. They are are also called univerversal motors. Aside from the speed control they will happily run on AC or DC.

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[Brunel]

A quick google turned up:

https://www.mmtoolparts.com/store/makita-armature-8050

Now what's the model number of the circular saw?

 

[rsanter]

I used to work for B&D and it was common that the same armature was used in several tools.
Just verify the part number used on each and you will know