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Old 05-25-2017, 07:56 PM
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Default Circular Saw Armature Bearing Removal: Clamshell Puller Fab...

Circular Saw Armature Bearing Removal: Clamshell Puller Fab...

I have a saw I need to repair, a Milwaukee 6405-6 8" circular saw--a real beast! Started making one hell of a racket so I removed it from service and took it apart.

The gear end bearing of the armature lost a few bearings somewhere in the vicinity of the driven gear. Fortunately they didn't take out the gear with them. Everything was carefully cleaned and inspected.

Didn't have a small clamshell puller so I made one entirely out of scraps and I'm pretty sure the nuts I welded on were used. The body of the puller was made from some 1/8"x1"x4" shelf braces, the tubes are 1/2"x 16ga x~1-1/8", 5/16" rod were unusable shorts.

Drilled a couple 1/2" holes near the edge of the body pieces, then cut out the edges of the holes and worked them on the sanding belt into the desired shape until they fit under the bearing. Cut the tubes to "size" and clamped everything in the vise for welding.

Figured I'd use the TA-95 lift-TIG since I hadn't used it in a while. But the cheapy HF autodark kept flashing me (they DO say not to use it for TIG) so I had to break out the ol' Jackson 4x4. Unfortunately, its head gear was broken so I had to pop-rivet it back together just so it would stay on my head... At this point I was wondering if I should break out the MIG...

Anyhow, I probably could have made the welds a little nicer but it was dark and I just wanted to get the puller done at this point. The welds certainly were functional and the welder was set at 60A about 20 flow. Could have gone more with the amps but I all I had was 1/16" filler wire and not much of that, either. (since restocked...)

One issue I had was I got one nut a little too hot and slightly melted a couple threads. OK, I'll just run a tap down it. Ask my helper where the 3/8-16 tap is--"I loaned it to so and so next door". "Well that certainly doesn't do me any good at 9 at night, does it!?!" A tap or drill bit is a CONSUMABLE item and it doesn't get loaned, it gets sold. And only if there are others of the same in stock. So what I ended up doing was cutting a slot about 3/8" deep into the middle of the end of a bolt with a hacksaw. The slot serves as a "thread-chaser" and worked perfectly to clean the melty threads.

Mounted the clam on the armature as shown and gently tightened the nuts to bring the halves together. Using about 2-1/2" bolts I then mounted a steering wheel puller to push against the shaft. Threaded it in by hand and the bearing came right off! Now if only the new bearing would be delivered by now--it has been about 3 weeks...
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  #2  
Old 05-25-2017, 08:31 PM
kbs2244 kbs2244 is offline
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Well done.
Now put that somewhere you can find it in 3 years.
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Old 05-25-2017, 08:49 PM
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Good. Ugly, but good.
Now, if you'd just paint it so nobody would notice then you'd have a Garage Journal project.
I used to have one of those saws. I think I gave it to somebody who actually needed it.
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Old 05-25-2017, 10:55 PM
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Quote:
Originally Posted by kbs2244 View Post
Well done.
Now put that somewhere you can find it in 3 years.
That reminds me that I made a prop puller not unlike the puller above but on a much larger scale. I THINK it is at the bottom of the toolbox with some other puller stuff BUT it has been 20 years since I laid eyes on it or even had a use...

Quote:
Originally Posted by cutter View Post
Good. Ugly, but good.
Now, if you'd just paint it so nobody would notice then you'd have a Garage Journal project.
Hey Now--I call that "patina"...

And FYI: HF has a puller set, I think it is around $50. #62593. I'll have to take a peek next time I am there. The clam I did have has a hole that is larger than the OD of the bearing I removed.
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__________________

TA Arcmaster 185 w/tig/stick kit
MillerMatic 252 w/3rd gen 30A
MM140 w/o AS, w/CO2
Hobart (Miller) 625 plasma
Hobart 250ci plasma
Victor O/A (always ready, but bored)
Lincoln Patriot autodark (freebie)
45ACP Black Talons for those stubborn jobs...

Last edited by mccutter; 05-26-2017 at 08:26 AM.
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  #5  
Old 05-26-2017, 07:46 AM
jimkinney jimkinney is offline
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That saw looks brand new, too bad they sent it with a bad bearing .

Nice job. I like the patina too.

I have a drawer in the workbench full of pullers, homemade and store bought. Makes it easy to find one when I need it. Of course there are a couple of broken ones in there too, that I'm gonna fix or replace one of these days .

Jim
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Old 05-26-2017, 10:23 AM
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I was just about to make a post to ask how to get a bearing off of an armature.
I was thinking of making something like that.
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  #7  
Old 05-26-2017, 05:12 PM
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Quote:
Originally Posted by alchemist View Post
I was just about to make a post to ask how to get a bearing off of an armature.
I was thinking of making something like that.
I'll probably be taking a look at the HF set tonight. I'll let you know if it would work.
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TA Arcmaster 185 w/tig/stick kit
MillerMatic 252 w/3rd gen 30A
MM140 w/o AS, w/CO2
Hobart (Miller) 625 plasma
Hobart 250ci plasma
Victor O/A (always ready, but bored)
Lincoln Patriot autodark (freebie)
45ACP Black Talons for those stubborn jobs...
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  #8  
Old 05-26-2017, 05:42 PM
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Quote:
Originally Posted by mccutter View Post
I'll probably be taking a look at the HF set tonight. I'll let you know if it would work.
Thanks. If it works I might get one myself.
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Old 05-29-2017, 11:26 PM
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Here is the smaller clam in the set. It would have worked for me looking at it closer... They just happened to have one of the boxes open so I could take a look.
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__________________

TA Arcmaster 185 w/tig/stick kit
MillerMatic 252 w/3rd gen 30A
MM140 w/o AS, w/CO2
Hobart (Miller) 625 plasma
Hobart 250ci plasma
Victor O/A (always ready, but bored)
Lincoln Patriot autodark (freebie)
45ACP Black Talons for those stubborn jobs...
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  #10  
Old 05-30-2017, 06:41 AM
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Thanks, I'm going to get a set try it out.
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