I guess it was going to happen sooner or later. May have had a partial failure of the motor winding, internally shorted turns or if there are parallel mosfets driving it, then one of them may have failed. I have a DCD778 so any measurements I make may not be comparable to the DCD7908.
Thats a good point, its very weird. Sounds like the motor is spinning like normal but it's entirely posible its failing for a second under load causing the clutch to slip.
@@Tools-Tested What's the speed post-failure without a load? If one of the MOSFETs has failed, I think that would mean that on one of the phases of the motor, it isn't powered. If there isn't a load, then inertia could be enough to get it past that at full speed. But when it's under load, it'll slow down and then the next phase gets activated and it suddenly gets pulled forward twice as far. Just speculating, I've never had to troubleshoot a brushless motor.
Failer could be caused by anything, a tip on how to use a drill notice all the holes around the drill motor houseing your completely covering it starving the fan from moving air in and out, air also passes above the battery to exit at the top cooling the electronic boards. Dewalt tools usually never get hot with regular uses compared to competition power tools, this is the only mistake i could abserve at the beginning mishandling the drill.
Does it do the same thing after failure and disassembly (skipping gears)? If so, perhaps something failed that not easy to see, like a ring gear stretching and allowing gears to skip?
Yep did the same thing after I reassembled it, kinda weird I didn't see anything. I was expecting carnage, but all the gears looked fine even the ring gears.
Thanks for the video. I have a DCD708 and I've been very happy with it, but I haven't pushed it hard like your testing. I'm curious if this would happen again if you tried another DCD708.
No problem! I was defiantly surprised, my first thought was I broke the dyno lol. I might try to pick another DCD708 up and see, Im curious if the results will be different.
Warranty it out, and finish the testing. With asterisk on how many drills it took to finish the testing. Ie you start with the 4ah compact battery and keep on going where you left off.
I'm very interested in how the successor (DCD794) does. And the DCD800 if you get to that one. I love these comparative tests. Very useful for directly comparing drills.
Hope to get the DCD794 soon, probably in the next week or so. I have the DCD805 which I believe is the same as the DCD800 only with the hammer drill function. I just need to find time to test it. I think its the best testing on YT giving max torque and power out with consistancy unlike other methods I have seen. But what's weird is I get hardly any views lol.
@@Tools-Tested Nice. Yeah, the 805 is just the hammer version of the 800. It's a bit longer but otherwise seems the same. I have the 800 and like it a lot. Very compact and powerful. I agree on testing; driving huge screws and drilling big holes can be a useful metric in testing, but the dyno gives an excellent "overall" reference to compare drills with. Keep at it! You're sub count will keep growing and with it, your views. The first 10k is always the hardest. It took my wife a couple of years to hit 10k on her tarot channel.
@@Tools-Tested You got this, just keep at it. 👍 Tool freaks like us love videos like these. I'll let her know. She's proud she made it so far after being doubtful for a while. Encouragement from her viewers and fans helped out a lot.
The most fun thing about testing is what you didn't plan to learn. Another good test and report. Thanks.
Yep didn't expect this at all. Thanks!
I guess it was going to happen sooner or later. May have had a partial failure of the motor winding, internally shorted turns or if there are parallel mosfets driving it, then one of them may have failed. I have a DCD778 so any measurements I make may not be comparable to the DCD7908.
Thats a good point, its very weird. Sounds like the motor is spinning like normal but it's entirely posible its failing for a second under load causing the clutch to slip.
@@Tools-Tested What's the speed post-failure without a load? If one of the MOSFETs has failed, I think that would mean that on one of the phases of the motor, it isn't powered. If there isn't a load, then inertia could be enough to get it past that at full speed. But when it's under load, it'll slow down and then the next phase gets activated and it suddenly gets pulled forward twice as far. Just speculating, I've never had to troubleshoot a brushless motor.
Failer could be caused by anything, a tip on how to use a drill notice all the holes around the drill motor houseing your completely covering it starving the fan from moving air in and out, air also passes above the battery to exit at the top cooling the electronic boards. Dewalt tools usually never get hot with regular uses compared to competition power tools, this is the only mistake i could abserve at the beginning mishandling the drill.
Does it do the same thing after failure and disassembly (skipping gears)? If so, perhaps something failed that not easy to see, like a ring gear stretching and allowing gears to skip?
Yep did the same thing after I reassembled it, kinda weird I didn't see anything. I was expecting carnage, but all the gears looked fine even the ring gears.
Thanks for the video. I have a DCD708 and I've been very happy with it, but I haven't pushed it hard like your testing. I'm curious if this would happen again if you tried another DCD708.
That's what I was thinking, maybe a one-off dud.
No problem! I was defiantly surprised, my first thought was I broke the dyno lol. I might try to pick another DCD708 up and see, Im curious if the results will be different.
Warranty it out, and finish the testing. With asterisk on how many drills it took to finish the testing. Ie you start with the 4ah compact battery and keep on going where you left off.
I have a DCD709, hope to pick the testing back up with that. Same drill but with the hammer function. Should be interesting if that one can last.
I had a problem with the clutch of my first 708, but DeWalt replaced it. Do you think it might be clutch related?
Yeah I think it’s something to do with the clutch even though it looks fine..
Yeah, I see through this, but I can relate - new version comes out - oops I broke my old one - better get the new one... 😉
Lol I wish that was the case, new version is on order though... and I have a DCB709. So once it comes in we shall see.
I'm very interested in how the successor (DCD794) does. And the DCD800 if you get to that one. I love these comparative tests. Very useful for directly comparing drills.
Hope to get the DCD794 soon, probably in the next week or so. I have the DCD805 which I believe is the same as the DCD800 only with the hammer drill function. I just need to find time to test it.
I think its the best testing on YT giving max torque and power out with consistancy unlike other methods I have seen.
But what's weird is I get hardly any views lol.
@@Tools-Tested Nice. Yeah, the 805 is just the hammer version of the 800. It's a bit longer but otherwise seems the same. I have the 800 and like it a lot. Very compact and powerful. I agree on testing; driving huge screws and drilling big holes can be a useful metric in testing, but the dyno gives an excellent "overall" reference to compare drills with.
Keep at it! You're sub count will keep growing and with it, your views. The first 10k is always the hardest. It took my wife a couple of years to hit 10k on her tarot channel.
@@NWGR Yep the dyno brings consistency in testing.
Hopefully I hit 10K this year, congrats to your wife on passing that milestone!
@@Tools-Tested You got this, just keep at it. 👍
Tool freaks like us love videos like these. I'll let her know. She's proud she made it so far after being doubtful for a while. Encouragement from her viewers and fans helped out a lot.
@@NWGR thanks for the support!
You can HEAR your PUSHING ON THE DRILL TO HARD
Let the drill do the work
Your treating that Atomic like it's a Hammer drill
I was only holding it, it's not actually drilling into anything. It's only turning the dyno.
I'm not sure this dude knows what a dyno is.
Mines broke out of the box and they won’t do anything about it(I got it as a gift from a friend).. in the trash it goes lol
Yeah I’m not impressed with the atomic line, dcd800 or 805 though is an animal.