Thread: Makita rotary hammer

Well done. Looks like you've made yourself quite a good deal. I picked up it's little brothers over here (2 x HR2220) for less than the SDS chuck is worth.

You gotta love eBay....

Damien

Good work Rossluck. Are you talented enough to rewind the armature yourself, or do you get a motor rewinder to do it? Also, what happens when the fields around the armature are burnt out? Are these re-windable too? Depending on your local services, I've sometimes found that the rewind can cost almost as much as a new armature.

And yes, eBay is great. If there's someting I really want I especially like to use a sniper program to lodge devestating bids with 5 - 6 seconds to go so that the other bidders don't get time to react.

Wayne

Originally Posted by Hardenfast

Good work Rossluck. Are you talented enough to rewind the armature yourself, or do you get a motor rewinder to do it? Also, what happens when the fields around the armature are burnt out? Are these re-windable too? Depending on your local services, I've sometimes found that the rewind can cost almost as much as a new armature.

And yes, eBay is great. If there's someting I really want I especially like to use a sniper program to lodge devestating bids with 5 - 6 seconds to go so that the other bidders don't get time to react.

Wayne

I'm certainly not talented enough to rewind:eek: , but I've always found that rewound motors last well. I bought a dead cut-off saw ages ago for $25.00 at a garage sale, and had the armature rewound. Since then we used it professionally for a year - about 20 cuts a day - and it's now retired to my shed where I'm using it at the moment to cut the steel for an extension. We tried to kill it but it has a strong life-force.

Yes, if the fields are burnt out you can get them rewound. I think the key to it is that you have to assess the value of a tool and how much you bought it for and all of that ....

The reason I wrote about it here is that I read a lot of "wish I could afford" posts in this forum, and I thought it might be helpful if some of the members could get into the habit of picking up cheap good-quality tools and fixing them. I'm sure Damien will agree that many a dead tool simply needs new brushes. When I find or buy a dead tool I inspect the brushes at the speed of light, and there's enormous satisfaction in finding that that was the fault.

The sniper idea is new to me. I'm not so sure about it. When I bid for things I sort of like a fair competition. If they beat me, then they wanted it more and probably needed it more. But, that's your choice, I'm not trying to moralise the practice or anything.

I find that most problems with the stuff flogged off here 'als defekt' are gearbox or brush-related. Be it an angle grinder, a jigsaw or a sander, more often than not, something has failed in the gearbox. Real luck is a simple bearing. Medium luck is when the axel has given way and the sprockets have fallen away from the spline, making repairs cheap. Usually though, it's something worse, and there's a lot of dickheads out there who think that grinding noise will go away if they just keep holding onto that trigger long enough...

A good example is the Makita shark saw JR 3000 V. There's often a hell of a lot of stress put on these machines. The first thing to usually happen is the slide on the shank gives. Then the crown wheel stalls. Now the motors in these things are no lightweights. Keep pressing that trigger and the spline will wear a nice flat spot on the crown wheel. Result: Buggered crown wheel and armature - and the whole lot goes in the bin.

What I see a hell of a lot is bearing failure in routers. I've seen casings on Elu MOF 69s that have melted because the bearings were so hot. Breaks my heart...

I've gotten good results with turning the commutators on a mate's lathe. Getting them nice and smooth again can often do wonders... I've also learned not to underestimate field failure. I've swapped over armatures on a couple of machines to find that the sparks at the brushes are being caused by a break in the field...

Main thing is the satisfaction of making a bargain. Ahhh... I think I'll go have a look in eBay now...



Damien

Pleasantly hear on how to give the new life for old machines. I wanted know your landmarks at choice of lubrificant.