Cordless Electric Drill Speed Control - Stripdown

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How does the speed control trigger work on a cordless electric drill? Is it full of springs and bits of metal that fly everywhere when you take it apart?
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1 окт 2024

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Комментарии : 172

@MrBinabanana 3 года назад

I don’t like to consider myself defeatist but, as soon as a spring has come out, I accept it’s never going back together in the same way that it came apart! Love your content, Julian!

@blackrockcity Год назад

There are two schools of thought here… A) Do the work on a carpeted floor so that pieces that go flying don’t roll away. B) Do the work on a hard floor so that you can hear where they fall when they land 15 feet away.

@stevefox3763 3 года назад

AVE has done many teardown videos on cordless drills and other cordless tools. His channel: ru-vid.comvideos

@thesolderman861 3 года назад

The switch has several contacts: 1.)The motor short-circuit contact opens, which is used for Motorbraking 2.) Light goes on + Electronics goes on, the Motorspeed depends on the variable resistor value. (Here with several discrete resistors instead of a linear potentiometer, as seen in older assemblies) 3.) B- contacts directly to the Motor, bridging the Mosfet. In older assemblies there was a simple NE555 chip doing the PWM. For higher battery voltages they used a resistor and a 12V zener diode to power it. (Seen in an early 24V NiCd drill.)

@sofa-lofa4241 3 года назад

I'm sure 'The Post Apocalyptic Inventor' has done a couple of speed controller teardowns, both mosfet and older types, Probably on one of his powertool restoration videos

@ElmerFuddGun 3 года назад

Honestly I didn't think you would get it back together, Julian. All those bits and pieces. Glad you persisted and got it done!

@liquidus2172 3 года назад

me: No schematic? BigClive: Hold my carbonated wine...

@stevehallam0850 3 года назад

Well done getting it back together without springs disappearing to all corners of the workshop!

@chartle1 3 года назад

AvE would be proud but at 4:00 he would have done something like tasting it to figure out the plastic shell makeup. 🤣

@njakts 3 года назад

I remember this was my first poor mans RC car ESC. Servo was pressing on that button and I had proportional speed controller. No reverse tho..

@JulianIlett 3 года назад

Wow - must have been a powerful servo.

@dansxmods 3 года назад

Wouldn't necessarily need the spring you push against as the servo could return back to home

@IJMacD 3 года назад

You need to check out AvE's videos for drill/powertool teardowns where he compares throttle implementations.

@THYROTRON 3 года назад

Give over.

@ElmerFuddGun 3 года назад

I'm pretty impressed by that switch module. A lot of time would have gone into its design. It is likely a "generic" controller that is used in a lot of brands and models but seems to work well for a brushed motor.

@denisouellet6518 3 года назад

Great video! You should probably see what's going on with an oscilloscope.

@dav1dbone 11 месяцев назад

Any idea what kind of MOSFET is in the trigger I'd like to replace the blown one I have?

@LMF5000 3 года назад

Thank you for posting this. I just bought a new drill and was wondering whether the sudden leap of speed at full throttle was a defect. My 15 year old Skil cordless drill had a fully progressive throttle from zero to full, but my brand new Trotec 12V behaves like a more extreme version of yours, where the trigger is progressive from zero up to about 50% throttle, then suddenly jumps to 100% throttle with no intermediate setting in between.

@LariFariYoutube 3 года назад

Hi, Julian..I took one apart some weeks ago. Same manufacturer but out of a Lidl machine. As far as i can tell, all the slider conatcts are for speed control, LED light, motor brake and "full on"...

@sortofsmarter 3 года назад

such a bargain, and a lot less to go wrong than on a modern $150 brushless unit. seems to me even if I buy the top brand vs the bargain brand as long as it has Lithion batteries they all seem to last the same before they get lost, dropped in the lake or stolen...or just plain die..

@JulianIlett 3 года назад

I agree.

@donepearce 3 года назад

PLEASE get a real soldering iron. That little job is really not up to these disassembly tasks.

@JulianIlett 3 года назад

I prefer imaginary tools :)

@donepearce 3 года назад

@@JulianIlett A nice big copper bit over a gas flame - that's the way to do it!

@pev_ 3 года назад

Indeed. That fancy (is it a TS-100?) tiny cheapy thing might be fine for some SMD or small component soldering, but just try a proper "station" style iron from any half-reputable manufacturer and you will never go back. I guess Julian uses his solar power i.e. around 12 V source for this and that just reduces the heating power to nothing. If you have to raise a soldering iron's temperature setting to unreasonable heights to try to melt solder on a larger metal piece, well, that is just telling you that you really should get a more powerful iron. Not to mention the comfort: whenever Julian uses this thing, I cringe because it is such a hassle to put it on the table so that the tip rests on that tiny wire support. A proper iron has a proper stand where you insert it with no effort and maximum stability. I do know about this personally, I battled with numerous cheap irons in my childhood/youth, and once I finally got a proper one (a quite basic Weller WTCP-S that I still use) it really opened my eyes to how crappy all the previous ones were.

@ElmerFuddGun 3 года назад

@@pev_ - His soldering iron doesn't bother me as much as that little "stand". That stand is fine when you are taking it "on the road" but not for regular work at home. It wastes time and just isn't safe. I'm sure there must be a proper stand designed for that iron that works like the rest at the proper angle, with tip safety protection and a built in sponge, etc. When Julian gets burnt because of it he will finally get a proper one.

@Mark1024MAK 3 года назад

@@ElmerFuddGun - I take a proper stand with me when I take my stuff on the road... many, many years ago I made do without a proper stand. Which was fine until I bumped the cable... then either the iron would burn me, or fall on the floor...

@websitesthatneedanem 3 года назад

Neil Armstrong - First man on the Moon. Julian Ilett - First man to put a cheap drill switch / speed controller back together and It Works!

@roberthorwat6747 3 года назад

I blew the mosfet on my Bosch 24 volter. Construction of the switch from memory looks pretty similar, only thing was when I replaced the mosfet I found I lost the variable speed control, it was just off or full blast on. Meh! It was going to the tip otherwise so for me that was a win. As you have shown, rebuilding these is a nightmare of a fiddle. The mosfet I took out had signs of spectacular and brutal explosive failure, which delighted the sadist in me.

@Peter12662 3 года назад

That IC is a GS069 rotational velocity controller. You can find it on Ali express real cheap. My Black and Decker cordless had a problem with the switch. It was not getting PWM to the mosfet gates. I was able to make it run by shorting the Drain to Source on the mosfets (it has 2 parallel mosfets). To my surprise the switch contained a 555 timer that created the PWM. I replaced the 555 and now it works.

@dansxmods 3 года назад

Kind of like a clean language British AvE that actually put the tool back together

@whitcwa 3 года назад

My BIL asked me to fix his corded drill's speed control. He gave me the drill and a baggie of loose contacts, springs, screws and clips. To his amazement, I managed to reassemble it in a few minutes. Not surprisingly, the circuit was a phase control triac dimmer with a variable resistor for the speed control.

@noakeswalker 3 года назад

That's a lot of stuff in there for £15 ! If it lasts >1 year, that's a very good deal I think.

@muzikman2008 3 года назад

How can we make a variable speed control as complicated as possible with a high failure rate?...here ya go! lol..

@DubiousEngineering 3 года назад

Sacrifice the DRILL!!! :-) Thanks for the education!! :-)

@ruinunes8251 3 года назад

So much technology and engineering in those switches that when it breaks down, because eventually it will break down, we are left with a tough choice of bin the tool or pay half of what the tool cost for a brand new switch. In this case, as this drill is a cheap drill, don’t be surprised if the switch alone is way more expensive than the drill itself. This week the switch in one of my multi tools gone faulty. The price for the switch is more than half the price the tool cost brand new. Bloody annoying.

@followthetrawler 3 года назад

I was hoping it was a thyristor chopper circuit and not a mosfet - old school motor control. :) Well done on getting the mechanicals back together, it would be in my 'box of bits that might be useful but never will"

@grahamtaylor6883 3 года назад

I was only interested in the first part of the video, but I had to watch until the end to see if you got it back together. I understood the first bit, but I have no idea how you managed to get all those springs and bits back together. You want an OBE just for that.

@FearofFeedback 2 года назад

Thank you so much for making this video. You are correct, I have looked all over RU-vid for a video explaining or tearing down a battery powered drill trigger assembly and so far you are the only one! I have an old DeWalt DCD771 where the motor died and I’ve been working to retrofit it as a handheld battery-powered motor controller for 12V car parts. Problem is, it is a 20V drill so I’ve been trying to figure out how to limit the output to avoid burning out 12V components. So it was down to either figuring out how to mount a different battery or modifying the trigger.

@Xfixiateher 3 года назад

I've taken one of these apart and the one I (14.8v) have is far simpler and uses a 555 timer (surface mount type) and same pcb slide system to drive a mosfet - i ran more than 24v into the drill and i killed the 555 just need to replace that and the mosfet as that died as well

@rimmersbryggeri 3 года назад

Ave has done it probably 5-10 times atleast. in his BOLTR series.

@jamiejoker118 3 года назад

I had 2 of these and the motors are rubbish 5mm shaft 775 motor went on ebay brought a motor £10 and replaced the motor very good drills now 069B is speed controller chip well done getting that back together

@jamiejoker118 3 года назад

@Schwalbe262 Mabuchi motor RS 775 WC 9013 6V - 18V about £5.50 you will have to shorten the shaft about 4mm off the end The original motor windings melt after short use

@frankowalker4662 3 года назад

Nice job on the re-build. I thought it would be some sort of wire-wound variable resistor. But I suppose that's ancient tech.

@ecospider5 3 года назад

I thought the brushless drills would have a much more complicated setup than the brushed drills. But after seeing this I’m going to have to say this was more complicated than expected.

@cheeseschrist2303 3 года назад

Ah, something else I didn't know I wanted to know about. 🙂

@gedtoon6451 3 года назад

This video reminds me of when Alan Partridge was bored and dismantled his Corby Trouser Press!

@CliveTrezona 3 года назад

Great vid. Now scope the fet for us, we want to see the pwm signal :-)

@RottnRobbie 3 года назад

Julian Ilett complains that there seem to be no videos on speed control, and says (2:24) "... if you can find one, let me know... " Me, after one minute of searching with the term "drill speed control": ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-j6QelCEMxkM.html (lsm13b's channel - '20V DeWalt Drill Speed Control Disassembled', Jul 5, 2019) But NEITHER of you provided a schematic, so you're both getting an "Incomplete" (BTW - his teardown is only 8 minutes, because it's not about taking the drill apart with the wrong screwdrivers, and putting it back together.

@jacksonblack9408 11 дней назад

It's astounding how many times I search something in google, and end up at one of your videos. Often its for the (almost) exact same part - literally holding an aldi brand drill that I chopped the power end off to use to modify a cordless stick vacuum cleaner, and started thinking about how the motor could be controlled by such a tiny switch

@lesliefranklin1870 3 года назад

Impressive! Humpty Dumpty called and needs your help.

@Splinter4077 11 месяцев назад

It's funny because I have a cheap 12v Tacklife drill that has a similar top assembly as this guy. I've been meaning to take it apart and convert it to ryobi 18v, but couldn't figure out how to open it up. It turns out, there are 2 extra screws underneath a thin plastic plate just behind the drill clutch. This thing was not designed to be opened, as the last step from the factory would be to have clipped it into place. Anyways, I broke that plate off and accessed the motor, it turns out, this cheap 12v drill has an rs550s motor, which has a range of 12-20 volts, so no voltage conversion necessary! Thanks for the video inspiring me to actually get on this.

@twentycm 3 года назад

WoooW , Really well done , I can’t believe you you put that switch back together 👍👍👍👍

@sloty3893 8 месяцев назад

I am currently working on an project where I am trying to control the speed of the drill externally. I found a way now with arduino, external power supply and mosfet module but since the powersupplies never give the right amp peaks (i guess?) the motor is constantly suffering. The basic Idea now is that the power comes from the battery back and the voltage is controlled by an external potentiometer (not a trigger, dont ask, its for an art project ). Any smart Ideas about that? thanks for the vid anyway!

@TheSlyMouse 3 года назад

Wow I'm impressed learned something about patience and slow and steady

@BenScarboro 3 года назад

Nice job on the reconstruction. I was thinking hall effect sensor, I was quite surprised by discreet connections on the board, great teardown.

@matthewb2060 Месяц назад

Anyone know if you can take a 12v drill and modify it to run at higher RPM's to be a polisher?

@snipersquad100 3 года назад

Haven't you heard of Ave's channel?

@JulianIlett 3 года назад

Yeah - in which of his 10,000 videos does he take the speed controller apart?

@jkbrown5496 3 года назад

@@JulianIlett I've not seen AVE go this deep into a trigger controller assembly. Not his expertise. So this video rounds out the teardowns.

@bimble7240 3 года назад

1:37 "are those not Philips, no they're not" he says, holding a Pozidrive screwdriver. It amazes me how many people confuse the two. Pozidrive screwdrivers don't fit Philips screws !😫

@efdawahfan 2 года назад

julian i switched the plus and minus from the battery by accident...and now my switch is giving me problems when i corrected my mistake the motor turns very slowly and the battery heats up very fast..i tested the motor and still works good when connected directly to the battery..is it possible the transformer or diode needs replacement or the complete trigger switch ?? my trigger looks identical to your my model is 6271D ... thank you in advance

@jlucasound 3 года назад

Are you kidding?! There isn't a mechanism that Julian cannot get back together. Maybe a Swiss watch, not sure. ;-0

@sayeretmatkaal 2 года назад

Reassembly of that nightmare contraption is conclusive proof that Julian is an alien with SIX hands ( and oversize brain )

@fatbelly2438 3 года назад

i bet some worker in china puts the triggers together 1 per minute

@0001jamesbond Год назад

Hi. Can u help me What is this big diode information? Thanx for enjoyable vidoeos.😊

@Chinhnguyen0497 3 месяца назад

hi. can you take a look inside cheap brushless trigger switch and modify it for smooth speed control please

@JamesMossR33 3 года назад

Great work getting that ESC back together, I'd have quit as soon as the reverser wipers and springs popped out. I stalled my Dremel, heard a pop and it only has full on and off since. I won't be opening it up!

@THYROTRON 3 года назад

What else has he to do?

@englishrupe01 3 года назад

@@THYROTRON Fix his wife's vacuum cleaners!...lol!

@CiscoFunk 27 дней назад

Buenas tardes, espero puedas traducir a tu idioma mi pregunta. El interruptor acelerador de mi taladro, dejó de mandar energía al motor, pero al accionarlo se siente un pulso de energía que quiere mover al motor y prende la lámpara al mismo tiempo durante 1/4 de segundo y nada más. Viendo que desarmaste uno igual para este video, quiero preguntarte ¿ es posible que se haya quemado el transistor ? todos los contactos del interruptor funcionan bien, la batería está cargada y funciona bien (la probé en otro taladro), el motor está limpio y no está trabado, es decir, el problema está en la electrónica del pulsador ¿ cual es tu opinión ? ¿ podrías darme algún consejo que no sea cambiar el interruptor completo ? Saludos y gracias por tu aporte, me sirvió mucho tu video. 👍

@hektorm2306 2 года назад

My cheap drill goes from 0 to 100, took it apart but don’t see what could be wrong with it… any videos out there ?

@creandoCOSASdiy 3 года назад

Damn. I recently bought a Jigsaw Machine that, a few weeks later stopped working. They refound the money and let me to keep the thing, i'd like to try fixing it like you did here. What happens is that the motor doesnt work when the trigger is pressed, it tries to turn, but is like if it's stuck somehow. Then i realize that if you keep pressing many times the trigger, eventually the engine start working, and if you dont let go the switch, the motor keeps working as a clock. But if you left go the switch, the issue remains. Initially i thought it was the engine, but due to that the trigger is to blame. It is the exact same model as the one the drill in your video has. ill try opening it and see what's going inside, but im sure ill make a mess with the trigger hahaha. Ill order a new one if that's the case.

@evans7057 2 года назад

I recently came across a Diode Gone Wild video that you might find interesting - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LroQPn59bWg.html

@pulsarq2 3 года назад

Hi, I have the same drill and I recently blocked the chuck, after stopping it, the led remained on and the drill turned full speed. I found a burnt hole under the MOSFET! The copper track that crosses was gone. I fixed it, but the MOSFET got hot. Can I replace it with an IRF540? THX for this video.

@Landrew0 11 месяцев назад

AvE did one about speed controls in cordless tools, in his drunken way.

@Daleb007 Год назад

just a question, can you cut those connectors and somehow connect a esc to it to make it remote, just looking at a project to see if it would be suitable to make it remote control, cheers

@SodAlmighty 3 года назад

"...and I'll have to suck the hole..." - Julian, 2021

@teknikeleman44 2 года назад

Hello, could you please write the value of the schottky diode used on the trigger.

@felixcat4346 3 года назад

Now you can return it for a full refund.

@twotone3070 3 года назад

Reminiscent of an 8 year old me taking the valves out of the family wireless back in the '60s, just the voltage and jeopardy level were a lot higher.

@DIYwithBatteries 3 года назад

Love these drill machines they sounds cool. 👍

@justmeEnglandUK Год назад

Just taking a multi tool variable speed controller to bits full of dust

@danieldougan8550 Год назад

Why do you keep advertising junk? Loop mo ki

@gregorythomas333 3 года назад

JINYUAN pronounced "Genuine" BAHAHAHAHAHAHA BTW: If you open the chuck all the way and look down it you will find the screw/bolt that holds it on the gearbox.

@sham1234567891 2 года назад

Hi Julian! Is it possible at all to repair a Bosch 12V Psb12Vsp2 speed trigger switch? Thanks for any help.✌️

@mohammadmursalin6817 2 года назад

Holy crap, I dropped my drill from 10 ft up the ladder today and it was giving me issues. It was a Harbor Freight Warrior drill and it looks like its 90 to 95% a copy of this drill in the video.

@johnmorgan1629 3 года назад

AvE does some good teardown and reviews of tools of all descriptions, including ripping the things apart at times to get to their innards. Has a whole BOLTR Bored Of Lame Tool Reviews, where he does such things, they are skookum. Even covers the speed controller, thingums in his virjayos. For drills AvE BOLTR drills, on security bar. Big Clive also does teardowns and explanations of a whole myriad of electronics, think he did one on how wiping contacts work on electronic micrometers/callipers, showing how discrete points can be measured. In the case of this drill the precision needed for micrometer would be sacrificed for coarser stepped speed control.

@Arturrr31 Год назад

Thanks, now I know that probably I am able to repair my Parkside cordless hammer drill. I was afraid that it is glued by epoxy resin or similar thing, but this video give me hope that reality is opposite and I can make an attempt of repair.

@blackrockcity Год назад

Rather than holding the work piece with a finger, I clamped it together with a small quick clamp with rubber jaws. One jaw sat on the mosfet heatsink and the other on the back of the enclosure. Then I used soldering helping hands to hold the work piece to the bench so I could solder.

@tims8603 2 года назад

I'm glad I found this video. I have a motor and speed controller that came out out of a 14.4v Skil cordless drill. I thought the motor would run on straight DC voltage but it won't. I was always wondering what was in that controller. Way more going on in there than I thought. I still don't understand why the motor won't run on DC unless it's an AC motor. Just FYI, you can buy those for less than $10.

@JanEringa8k 3 года назад

Possibly one of those stupid cheap micro-controllers Dave from EEvBlog was tinkering with?

@jamiepipe1635 3 года назад

Got generic replacement triggers from aliexpress a couple of years ago fitted into my Ryobi 1+ drill and driver think they were about £3

@arminkisic8666 2 года назад

i subed and left like for doing somthing that noone did

@anvz6 3 года назад

A 555 with irs associated components is more expensive than a microcontroller programmed for generating pwm in following a voltage red with it's A/D converter.

@BRUXXUS 3 года назад

Looks like a very capable little drill for the price. I do wonder why they don’t use a 555 for simple PWM stuff like this, but I’m very much not well versed in EE stuff.

@lloydgarland4667 3 года назад

There's probably some kid right now laughing at watching you take hours over something s/he does in 10 seconds or less at some factory in China! Thanks for the info Julian, I always assumed it was some sort of variable resistance. Live and learn eh?

@chikiguites Год назад

Thats was a magnifecent wanderfull job! Thank you, it was so usefull!

@jlucasound 3 года назад

Hi, Julian!! Hope you are having a great day! Thank You for this tear down. Hope you have more sunshine where you are than we have here in "New" England. It may be new but not improved!! ;-) Just kidding. Spring is right around the corner!

@jlucasound 3 года назад

Just think. Somewhere on this planet is a drawing of that piece of metal that adhered to your arm.

@CTCTraining1 3 года назад

Well done Julian ... modern tools are a nightmare to rebuild. At least you didn’t need to chuck it a bucket like AVE 😀

@fredflintstone1 3 года назад

I always thought they were just black magic:-) but no longer:-)

@pazzy4501 Год назад

Well done 👍🏻you are the best

@jimenezsplaylist4618 Год назад

Can you do a load test mate

@samsungsexy7164 3 года назад

Hi, l have 12v combi screwdriver PBSA 12 D4. Is it possible to make the worklight stay on for a bit longer after releasing the trigger pls? (you shown the light at 5:20 and 22:23 mins of this video.)

@piconano 3 года назад

Looks like quality landfill tools.

@maicod 3 года назад

before watching this, the big question will be: will this cost you 17 pound 50 :)

@maicod 3 года назад

it didn't :)

@powergym1984 3 года назад

Very helpfull,you let me understand some issues with my AEG trigger.Very pleased

@emesma 2 года назад

Thanks for your time and effort to find out how the word controller is assembly. I wondered how they work to adapt one in my very old drills. Loved your work.