Tool Teardowns

[xyhapu]

I'm sure a lot of us like taking things apart and poking around inside to see how they work/how they were designed/see what kind of wear and tear they've been subject to. AvE's YouTube channel is great for this kind of thing, though there are sadly only a handful of teardowns.

Recently I took apart my Milwaukee 2755B-20 compact impact, it's only a month old but has seen heavy usage so I decided to go in and see what it looks like, and relubricate it while I was in there. The official service interval is a year but that's obviously a pretty useless number to go by.

Only real surprise was the Cheez-Wiz-like factory grease, I had expected the normal turquoise Type J grease Milwaukee specs for this thing. Whether it's just a different color of the same thing or something else I have no idea, regardless it was wiped off/scooped out with prejudice and replaced with the proper turquoise stuff. I noticed it was discolored to gray in quite a few places from wear particulates so I'm glad I did, though I'm sure it would have been fine for longer.

Bonus pic of the battery charger, it gets quite hot stuffed in the corner of my tool cart so I added some heatsinks to the heatsinks (heatsinks all the way down!) and opened up what I assume is a ventilation slot at the top of the PCB that was blocked off by conformal coating or something. It only gets lukewarm now.

Anyway show your own teardowns/links to teardowns! There are disappointingly few floating around the net.

 

[firworks]

Live! Live cool thread! It could just be that nobody knows of better teardowns than AvE's. They're the best I know of.

 

[General Geoff]

He's the master of skookum choochers.

 

[woody 73]

for what it's worth I just posted one of Ave's video on the GJ in the last two weeks I don't mind the tear down but the only name he has for the tool in question is the word "****" sure it is made in china, sure it is not the best quality and he did not pay out the wazoo for the tool so how about saying something like..."The tool in question is subpar as compared to say a tool made in Germany".

We get it you hate the tool Mr. skookum but not every tool center in the US sells the high end German power tools instead they sell the Dewalts, Milwaukee, and other Chinese power tools.

Post I was talking about:

http://www.garagejournal.com/forum/showthread.php?t=307502

 

[neonlazer]

He's the master of skookum choochers.

He cracks me up.

 

[xyhapu]

I decided to open up the hammer case on my Mighty Seven NC-4630Q 1/2 in. stubby air impact, partly due to concern about the amount of grease leaking out from around the anvil, and partly because I've had several people tell me these stubbies are for specialized use only and they will die a quick death if I keep using it as my daily workhorse, so I wanted to see what sort of wear it was experiencing and how beefy the parts were.

I found the parts to be satisfactorily tough-looking to continue using the gun as a daily without worry, they are not much different from those found in full size impacts; it seems like the stubbiness was achieved by a compact but wide air motor design as well as by using a single, normal sized hammer as opposed to two miniature ones. The only thing I didn't like was the lack of proper bearings for the anvil sleeve and thrust surface, and the anvil sits pretty loosely. I suspect this was actually intentional for reasons relating to my grease complaint.

There is a hole I didn't expect inside the hammer case, just above the trigger--I believe it's there to send a small amount of compressed air directly into the hammer case, and along with it any tool oil you put in the intake, thus keeping the impact mechanism lubricated, presumably minimizing the need to open it up and re-grease it. The exit for this air seems to be where the anvil sits on the outer case, explaining why grease kept leaking out. This seems to be as-designed, and even after heavy use there was still plenty of grease in there when I opened it up, so I don't think I'll worry about it in the future. This seems like a smart but unusual design feature, I don't know if it's common in air impacts but this is the first time I've seen it.

 

[NUTTSGT]

Where would one purchase this "normal turquoise Type J grease" at ?


I have a Dewalt jig saw that needs some. It was making some noise after I put it back together and took it back apart. Since I had nothing else, I used some white lithium for the time being.

 

[xyhapu]

Where would one purchase this "normal turquoise Type J grease" at ?


I have a Dewalt jig saw that needs some. It was making some noise after I put it back together and took it back apart. Since I had nothing else, I used some white lithium for the time being.

Milwaukee's page for it shows some online vendors that have it available:

https://www.milwaukeetool.com/accessories/miscellaneous/49-08-4220

I'm not sure whether the vendors actually have it in stock, or if they special order from Milwaukee and then ship it to you. That happened to me and it took a couple weeks for the grease to arrive.