The spring would need to be *wound* the other direction for it to be flipped and see a difference from a spring direction change if any. Rotating it on its head 180 degrees wouldnt do it. What's unique about the spring isn't that its so strong, a heavier spring would not allow for the assembly to bounce all the way back. It's the whole strategy they used that is fascinating.

DeWalt: What if TTC gets hold of this? Better paint the spring yellow.

Perfect timing. My wife was just asking for a new one.

The spring is most likely painted as a code. Where ever it is manufactured, there are probably others that look similar; but, have a different compression value.

DeWalt should reverse that spring and internal helical and call it the DCF861 Driver, while this one becomes the DCF860 Reverser.

I always get a kick out of seeing one tool brand disassemble another brand. It’s silly, but I like to imagine they are sparring against each other.

I'm beginning to think DeWalt has some dark magicians working at their R&D labs.

This channel is the best thing to happen to the internet

Crazy what you can find out when you actually break the tool down instead of just driving lag bolts to compare stuff. Thanks for your time and passion for tools.

I need to get my hands on that and fit a 3/8" anvil on it!

Hey y'all. Just wanted to say how much I love this channel and that it has genuinely HEAVILY influenced my tool buying tendencies. I've got most of the heavy hitters (career mechanic that also does a fair amount of work on the side) including the Astro Thor 1984 1/2" and the DCF961. Don't think I'd ever have bought either if not for the hard-earned real world numbers from your channel. Every time a coworker is considering a new tool, I always tell them about this channel first. Keep doing what you're doing, I absolutely love it.

The painted spring reminds me of primary clutch springs for snowmobiles and atvs, where different colors mean different compression rates

That needs to be tested with an anvil instead of the bit chuck

Love the analysis, and the camerawork is outstanding.

Cool slow mo footage! That thing hits fast!

This is incredibly interesting! Thanks for this breakdown, guys 🙏🏽

This channel is so underappreciated. Great video great work!

Really interesting footage. I think this should be the baseline for dealing with problems. It’s easy to say that something isn’t normal or even broken but investigating it to the point where one clearly sees the fundamental cause is the right way to end the story. This is genuinely good information. Thank you very much!

Wow! That is one cool impact! That camera you have is vrey cool. Thank you have a good day!

Thank you for this video, you make great content.

Great a two episode week on the torque test channel

I’ve always wanted to see a brand by brand socket strength and slipping comparison. Huge fan of your videos!

I have been surprised with my Gen4 M18 impact through a few mishaps. 1st I left my work area to do something and a concrete guy set up a ladder and wet-cut an 18in square hole above my impact covering it with concrete sludge water. I was livid! I opened it up and found no internal signs it happened at all! 2nd, five months later, I dropped it (came off my belt) from 40ft off a boom lift onto a wood railing, onto rebar, and into a 10in deep mud puddle. I went down and cleaned it off and then decided to disassemble it, to find hardly any muddy water inside, cleaned it up, and reassembled it without any problems. Took it home and re-greased it. 3rd, I dropped it again from my belt clip and the front of the impact popped halfway off (it only clips on), popped it back in, and again other than a sharp gouge in the housing, it still works great! Also, the belt clips suck when you bend down to pick things up. Other trades are often selfish ass holes! He could have moved, or asked me to move my tools. No apology or anything. Later, I heard Karma bit him in the ass when someone knifed the sidewall of his truck tire.

I've seen videos of the DCF860 driving screws slightly faster than the latest M18 fuel, repeatedly. I wonder if that "dance" has a rhythm in forward that is better timed in a fastener in wood scenario vs the dyno. Otherwise it seems like it would perform worse with all that missing, even considering the slightly higher speed and listed IPM.

Quality content unbiased content. This is so much better than Tools with Sol.

This looks like so much fun!

Great video

Hopefully mine comes in soon have a lot of TESTING to do

DeWalt seems to have dialed the tool in (the spring) so that you're hitting the natural frequency of the hammer assembly, with the rebound timed in just the right way to get more IPMs out of the assembly. Pretty gnarly vibrations as a result but I'm wondering if they're gonna push this on their future tools.

For me, the highlight of this video is the roller bearing in the nose. Finally! Combined with the longer, beefier anvil, this should be the low runout, durable impact I’ve been waiting for since the DCF895.

I love these cutaway tools you make.

Thanks for the video

Thanks for the amazing vid

Great video thank you!

Two videos in a week! 💪🏼

Just used mine first time on a job yesterday, it’s quick for sure

Love to see a dual spring version of this with beefier hammer and motor. Might not fit in the same class but the idea shows promise

That fwd rebounding reminds me of the triple hammer Hikoki you guys tested, it's definitely a powerhouse

This channel is awesome. You appear to have put more work into analyzing this tool than the manufacturer.

if you torque a coil in each direction and it will either expand or contract along both axis (longer/shorter and wider/skinnier). seems like the friction on the spring allows the slightest amount of that torque to 'tighten' the coil when in reverse. where when in forward that torque makes the spring expand in both directions, making it longer, thus harder to compress.

Now this is a great tool

Any chance you could do a video on Rivnuts (nut-serts) and how strong they are? Maybe testing torque loads and force required to pull out? That'd be super cool, especially since it doesn't seem like there's any content on youtube covering this. Appreciate the content by the way!

Wow. Real testing! ❤

I wonder if there isn't a slight variation between the angles on the contact faces? Say forward being square and reverse being slightly angled to add just enough thrust energy to the hammer to bounce it every second strike? To wind the spring to get the exact change in strength for the direction change would be extremely difficult. The precision required in all aspects of it's manufacture is signifigant and wouldn't come cheap.

Fascinating for sure! I have seen industrial equipment have painted or coded springs for various strengths, lengths etc. but I have never seen this in a tool either. Makes you wonder if some of the first releases have initial beta springs during testing. "That yellow spring tested the best go ahead and start sending them out with that one..."😂

Yes very enjoyable. Another great reveal on the insides of these tools. Do you know if Dewalt's engineers film their tools like this ? 🤔 Or any of the other tool brands for that matter.

Have you tried having some shims made to preload that hammer spring a bit more to see how that would effect the performance of the tools?

Could you take a look at 26650,26700, 26800, 32700 cells for battery packs. There's some very interesting combinations. It would also be cool to see the new 4680 cells in a pack, you can get 25AH and 250A though the BMS on the market would probably support up to 120A before the wires in the tool start melting and would be a 1.75kg behemoth for just the weight of the cells alone. I have a chart of all cells usable in 3.7v and 3.2v

Imagine being the engineer on this tool and watching a video say you broke physics. Proud dad moment. The needle bearing is an unexpected nicety too. DeWalt has been stepping up its game the last several years with all the Milwaukee perceived dominance. If they could make the collet and the tool overall just a bit shorter, I think it would get even more adoration from the people. That 5900ipm high speed internal shot was crazy. The external use shots were even more wild. Awesome! Thanks for going in depth. P.S. I sent you a message on Insta a while ago about some tools you might want to check out. Went to your filtered requests.

At first, I was excited about higher performance but then remembered, my gen4 Milwaukee M18 1/4in impact is able to strip or break 1/4in concrete fasteners and even break 1/4in-3/8 drive impact socket adapters. 3/8 concrete fasteners are much tougher but if I try I can strip those too. I am pretty happy with my M18 tools for most needs and even the M12 is just the right amount of power and lighter weight.

PLEASE test all the cordless 7/16 hex drive Lineman Impacts.

Interesting, I thought it was down to programming as well so just as surprised to see an engineered solution. SBD wizards seemed to have tweaked their magic again! Thanks as always TTC!

It looks like the forward rotation may tighten the coil of the spring reducing it's length. Just the opposite will occur in reverse.

It's worth inspecting the ramps. I suspect they have a different pitch in fwd vs rev.

I find all these new tool advancements amazing especially as a mechanic. This year I swapped out all my 1/4" style stuff out for 12v from the 20v because of weight and if I really need the power I'm just going to step up to a 3/8" or larger 20v anyway which thanks to the last few years of crazy competition between the brands has pretty much made these tools monsters compared to when I first started out 10 years ago (anyone remember Dewalt 18v haha). Air power is still king but man I can't remember the last time I had to resort to mine. I actually forgot I had an air powered ratchet (probably because electric ones don't try to break my hand). Innovation is a heck of a thing.

You should do a second channel where you talk like David Attenborough over super slow motion shots of impact mechanisms working. Watching this was like watching Planet Earth but for tools.

I guess you could say its been an impactful month of videos :)

That painted spring reminds me of a NASCAR spring when they painted them yellow or white so when they wrecked and it went flying off it was easy to see on the track so drivers wouldn’t hit it.

Great video thx

Wow, TCC and Project Farm videos for Sunday. (No surprises from Todd).

Now this is my kind of science boys 😎 job well done!

This is actually great. Wonder if resonant frequency is relevant. They should honestly just drill drive forward and impact on reverse. You don’t need an impact gun for anything tightening other than like wood lag bolts

I thought the same thing about, flipping the spring. How awesome that would be to have a 6k IPM impact. Makes me wonder if you got one with the spring put in backwards.

Vibration dynamics is one of, if not the hardest subject in mechanical engineering.... this made me shivers a bit with ptsd. I guess dewalt went to find some PHDs and locked them up in a lab to tune impacts, which is something a lot of tool companies have been doing lately.

Good match. if the spring were tougher or thicker it wouldn't hit as strongly.

Seems like the spring winds up and releases in forward causing the inconsistency

So if you wound the spring the other way, would you be able to switch the performance and have it work better in forward than reverse? You guys should totally get a custom spring made and try it.

Mind that they opened the hammer/spring chamber. So there is no air cushion/absorber. Also oil or grease will seal off a air chamber. The spiral spring itself needs to be wounded up or down this effects the spring tension for forward or reverse hammering force.

The impact head reminds me of the spicy soda can, with the long travel and super thick spring

It always amazes me that the whole mechanism in these tools can handle all that violence for years and years. I have never had any impact driver fail because of an issue with the hammer/anvil/spring breaking. Its always been either the plastic casing fails or at least back in the brushed days was the motor

I wonder if you could put some shims between the 2 ends of the springs to remove some of the torsional spring effect that the spring has to see if that would change the difference between forwards and backwards.

turn the spring around I wonder if the spin is making it compress easier with the springs twists rather then against

Hello , is something different between friction ring and detent pin , with the same matterial ? And the friction ring with the hole and without the hold is anything different . Thank you

Hey. Let me suggest this. How about a stronger spring? Could you do that?

Now replace it with a stacked wave spring and see if the fwd/rev are equal. I bet it'd be a shorter assembly too.

I think ave talked about this in one episode awhile back how to get way more out of the tool with it ballanced like this.

You know the big brands watch the channel. Will be interesting to see if they get a spring wound in the other direction and truly make it a driver.

That mechanism would make a great impact wrench with it's emphasis on removal torque.

Reverse looks like it approaches resonance between the spring and hammer hence more power.

Do you reckon the axial hammering has any effect on loosening, say, rusted out fasteners? Or is the energy too small for that?

TTC, do you think Dewalt did this sort of thing with the camera on their product during design? Or did it all thru simulations and testing with fully assembled units and never a camera and cutaway?

Put a roller bearing on the bottom of the spring like the early colts have on the bottom of the hammer. Probably stop the harmonics of it scooting forward and let it max out every time like in reverse.

I'm wondering if the variance in speed has to do with the coil rotation as the torque in the forward mode what would cause the spring to expand whereas in reverse the coil contract inwards allowing for it to hit that likely designed resonance

I figured the Dewalt had something different going on inside. Very cool

Could this be driven by bench power? Could try to tune the volts and see if it would improve with future battery tech

Toolkovsky's Boltcracker Ballet Also that's just a suuuuper heavy duty brake drum return spring... 😅

I would say that's kind of future proofing for their next generations they can just increase that spring and that's gonna give them the higher outputs without changing the rest of the tool.

Maybe you can turn the spring around and make it go faster forward?

I just saw something similar to this on Steve Morris KZfaq channel. It’s all about spring harmonics.

Where did you get your deep impact bits from

I wonder if it might be spring wrap. I wonder if the center of the hammer where the spring rides was turned down a little bit then forward would be more similar to reverse.

What if you ground down or otherwise removed part of the end of that taper on the hammer. Would it still bottom out? Is it due to stacking tolerances of the spring rate and design of hammer taper? Or is it there on purpose to limit the travel so it bounces back faster?

that is very impressive...

I wonder what would happen with a double spring set up with the twists going opposite directions or a totally different setup like x shaped leaf spings all the way around.

Could the face angles on the anvil also be different? Might cause the harder deflection of the hammer in one direction.

when will they start selling in canada?

A-10 go: 8:38

I know this might be way left of your normal testing, but could you test axle shafts, torque obtained before failure. You could test all the dana axles vs RCV thanks if you read my comment

How does it get pulled back and under spring compression?

That paint on the spring might be a type of wear indicator. Similar to what is used on the springs of the drum brakes on cars. 🤔