Author Topic: Festool or Milwaukee Impact driver?  (Read 4081 times)

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Offline Cheese

  • Posts: 7511
Re: Festool or Milwaukee Impact driver?
« Reply #30 on: June 21, 2020, 01:49 AM »
AEG built “a custom-made cordless drill screwdriver for NASA Space Shuttle missions. In 1984, astronaut Bruce McCandless made use of the screwdriver on one of his spacewalks, 350km above the Earth.”

Michael, if the subject matter is AEG...I am way impressed with their tool offerings. It's some pretty outstanding stuff. It's just too bad they were sucked up and then simply disappeared or were left to dangle and die on their own.

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Offline Jiggy Joiner

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Re: Festool or Milwaukee Impact driver?
« Reply #31 on: June 21, 2020, 06:14 AM »
I think it’s down to what we term as a true cordless drill?
I have seen photos of the Black and Decker NASA drill, and pictures of the first Makita cordless drill, developed for trade and DIY.

The Makita was a turning point for me after suffering a pump screwdriver for a while. Although it gave me very muscular arms, I hated it. When I bought a second Makita, it changed the way I worked, and my productive output shot up.

I wonder how I would of managed with the Black and Decker/NASA offering?  [big grin]
Right tool for the job springs to mind.

So as great as the NASA drill was to the space program, it had no use for any of us.

So for me, where it mattered most, Makita saved the day bringing a true cordless rechargeable drill to the market, covering trade, DIY and engineering etc.
If you compare the Makita to the NASA drill, they are chalk and cheese.

Some will know, that owning a true cordless drill in the 1970’s was quite a rare thing, and Makita made that possible.
I have bought a vast amount of there tools and upgraded my drills and impacts many times, and given or sold my previous fully working tools.
Hand on heart, I have never had a single issue with a Makita cordless drill/driver.
Whilst colleagues who opted for De Walt, Bosch, Milwaukee, etc etc, were often swearing at their choice of cordless drill as it failed again.

One guy who kept having Milwaukee cordless impact driver, and cordless SDS drill issues swore he’d buy no more. I suggested trying Makita, nah he said, I don’t like the colour of them???

Makita have brought out some tacky stuff, and some not so good tools, like their early multi tool, absolute rubbish, or expensive doorstop maybe. The current version isn’t great either, although a new brushless version is coming. Generally though, they make innovative and reliable tools, and cordless drills, drivers and impacts is where they excel. They are also along with Hilti a company that isn’t by corporates etc, there’s a lot to be said for that.

Changing the subject, I have always believed that Fein invented the multi tool, they are again (opinion based) the best available along with the Vecturo version.
These are the only makes I’d consider in multi tools. They are fantastic, and the power of the cordless versions is unbelievable.

So, Fein invented them, for trade and DIY mainly, or does anybody know different?

Offline Cheese

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Re: Festool or Milwaukee Impact driver?
« Reply #32 on: June 21, 2020, 09:52 AM »
So, Fein invented them, for trade and DIY mainly, or does anybody know different?

The first DIY Fein was a derivative of the tool they made for the medical field for removing/cutting plaster casts from patients.

1967



1986

Offline Banana

  • Posts: 48
Re: Festool or Milwaukee Impact driver?
« Reply #33 on: June 21, 2020, 11:33 AM »
J.J. -

You used the word “invented”.  So my mention of Black & Decker was simply to give credit where credit was due in passing.   


Using the right tool for the right job,  Merriam / Webster Dictionary;

Invent:   to produce (something, such as a useful device or process) for the first time through the use of the imagination or of ingenious thinking and experiment.

Mass-Produced:   to produce in quantity usually by machinery.


I think the confusion derives from the details:

In ’69 Makita produced the 6500D battery drill. It was the first ‘rechargeable’ portable power tool vs ‘battery-replaceable’ or 'one time use' powered tool.  It had about a 5' power cord tethered from the two handed metal drill to the battery.

Besides B&D’s unveiling of the first cordless power tool in ’61 they also made a rotary hammer ‘drill’ for the Apollo moon program.  That program spanned from appox. ’63 to ’72.

In ’78 - Makita came out with the 6010D rechargeable drill which was the first ‘Ni-Cd’ battery tool.
« Last Edit: June 21, 2020, 11:47 AM by Banana »

Online rst

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Re: Festool or Milwaukee Impact driver?
« Reply #34 on: June 21, 2020, 11:35 AM »
I have the air powered version from that time frame.  Somewhere!!

Offline Alex

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Re: Festool or Milwaukee Impact driver?
« Reply #35 on: June 21, 2020, 12:58 PM »
You used the word “invented”.  So my mention of Black & Decker was simply to give credit where credit was due in passing.   

Meh, "invented" ...... drills existed and batteries existed. Only a matter if time till somebody connected the two together, not such a big step.

Offline xedos

  • Posts: 341
Re: Festool or Milwaukee Impact driver?
« Reply #36 on: June 21, 2020, 04:08 PM »
It's my understanding that ol man Decker had the idea/design for a cordless drill long before NASA came a calling. 

He apparately saw the need for them in the aluminum siding biz that was all the rage after WWII.


Alex, your view is both cynical and jaded. 

Saws and straight edeges existed before Festo decided to mate the two.  Plastic and tools existed before someone decided to put the two together instead of all metal construction that was heavy and hot.

Nothing is really new , until it is.
« Last Edit: June 21, 2020, 04:12 PM by xedos »

Offline Banana

  • Posts: 48
Re: Festool or Milwaukee Impact driver?
« Reply #37 on: June 21, 2020, 04:09 PM »
Meh, "invented" ...... drills existed and batteries existed. Only a matter if time till somebody connected the two together, not such a big step.

hmmm... I’m imagining that being used as a closing argument in a patent trial,  or replacing Neil Armstrong's famous quote "That's one small step for man, one giant leap for mankind".     Can't decide which I like best.

Offline Jiggy Joiner

  • Posts: 1111
Re: Festool or Milwaukee Impact driver?
« Reply #38 on: June 21, 2020, 08:33 PM »
@Cheese, I thought I’d seen similar to the multi tool in my past. Being it was actually Fein who made those plaster cast cutters, I think they take the honours.

Apparently though, the first ever multi tool was designed by a Roman, obviously not electric and possibly not oscillating but, termed as a multi tool.

Other than that, I thing Fein can claim invention of the electric OMT  [wink]

@Banana the 1978 Makita was my first cordless drill bought in that year, maybe “invented” wasn’t the correct term to use but, Makita were first to introduce such a drill to the market.
Although a small drill, I think you’ll agree, it looked like a drill as we recognise them, and performed as such.

I admit I was very excited at seeing one for the first time, when working for a pal, and even more excited at actually saving up and buying my own.

It certainly brought a lot of attention and comments.

I never saw anything like it offered by any of the known power tool makers, Hilti, Elu, Bosch, AEG, De Walt, Panasonic or anybody else.
So in my chosen profession, Makita were pioneers of the cordless drill.

As I say, I have stuck with them, and find them better than any other make. They improve with every model, even the base model will more than deal with most scenarios, and apart from power, they ar so comfortable.

A fan of other brands of cordless drills might say the same but, where were they in 1978?  [scratch chin]

In honesty, I’ve noticed with the Makita models of the last few years, their only downfall is, the lovely comfy soft rubber grips and protection skin, can peel after a while. Easily glued back but, maybe something more durable would make them perfect.
They still bounce well like previous models too.

We mainly use the top end models as we use them all day every day. We’ve started using the 4 function drills lately, we’ve had them years but, started using them more lately. They’ve been around years but, many think they’re a new line.

If I could only own one cordless drill this would be it, no question.
Does drilling, hammer drilling, screw driving and impact driving. Not sure another make of this is available? There wasn’t when it was first launched, including the brushed version.

Again, that’s Makita pioneering the cordless drill.  [wink]
« Last Edit: June 21, 2020, 08:46 PM by Jiggy Joiner »

Offline Banana

  • Posts: 48
Re: Festool or Milwaukee Impact driver?
« Reply #39 on: June 21, 2020, 10:41 PM »
While I have a bit of Milwaukee’s new stuff, and a ton their old usa corded stuff collecting dust, I would say regarding newer tools (limiting it to the 'colors') that if I were pressed on that matter I would admit to placing more trust in Makita.  All of the ’colors’ have hits and misses but for sure Makita makes some great cordless impacts / drills and seems to have a deeper and more diverse bench in tools.  Some of the drills (impact or otherwise), that are only available in Japan, are real standouts.  May have mentioned here that I’m keeping my eye on their new 40v stuff.

You bring up Panasonic,  owned two of their early drills and really wished they still had more of a presence in N.A.   Would like to know from anyone who is using their current stuff how it stacks up these days. 

Offline Jiggy Joiner

  • Posts: 1111
Re: Festool or Milwaukee Impact driver?
« Reply #40 on: June 22, 2020, 06:36 AM »
While I have a bit of Milwaukee’s new stuff, and a ton their old usa corded stuff collecting dust, I would say regarding newer tools (limiting it to the 'colors') that if I were pressed on that matter I would admit to placing more trust in Makita.  All of the ’colors’ have hits and misses but for sure Makita makes some great cordless impacts / drills and seems to have a deeper and more diverse bench in tools.  Some of the drills (impact or otherwise), that are only available in Japan, are real standouts.  May have mentioned here that I’m keeping my eye on their new 40v stuff.

You bring up Panasonic,  owned two of their early drills and really wished they still had more of a presence in N.A.   Would like to know from anyone who is using their current stuff how it stacks up these days.

Totally agree on the Makita stuff, I have now got quite a bit of the 36v stuff as well as the 18v platform, as we’re striving for the cordless platform throughout our mobile site work.
I imagine the 40v will be as good, if not better than the 36v and with a single battery.

I just hope they continue with the 36v too, which I’m told they will, as we’re heavily invested in Makita, and so many 18v batteries, that I’ve lot count.

I have a fair collection of Festool power tools too but, they are all mains powered. I’m about to get into their cordless with the hybrid sanders but, they have a variety of battery types.

Regarding Panasonic, when I did my apprenticeship, one of the friends I made was a guy who’s father ran a carpentry business.
A few years down the line, we met up by accident, I ended up working for his father, they were Panasonic fans in a big way.
I never felt the drills looked very ergonomic but, being honest, after trying them, realised I was wrong. They were comfortable and very powerful, very expensive too.

I met again with my pal a couple of years ago, he has run the company for a long time now. He told me he still uses Panasonic, and has never had a single issue with any of their tools.

Over here, you still see Panasonic tools being used and the owners love them but, the main brands you see are De Walt, Milwaukee, Makita, Bosch, Festool, Mafell, some Metabo and then the cheap stuff.

It used to be mainly Makita and De Walt but, you now see a lot more Milwaukee and Festool too.
One thing for sure, these are great times in power tool technology, I just wish I was younger to use it more.

Offline derekcohen

  • Posts: 468
    • In The Woodshop
Re: Festool or Milwaukee Impact driver?
« Reply #41 on: June 22, 2020, 10:28 AM »
I am curious to know how, in the world of hammer drills, the Festool DRC 18/4 holds up against the competition?

Regards from Perth

Derek

EDIT: I have the PDC, not the DRC.
« Last Edit: July 12, 2020, 09:32 AM by derekcohen »

Offline Cheese

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Re: Festool or Milwaukee Impact driver?
« Reply #42 on: June 22, 2020, 10:47 AM »
@Cheese, I thought I’d seen similar to the multi tool in my past. Being it was actually Fein who made those plaster cast cutters, I think they take the honours.

Hey @Jiggy Joiner
I have first hand experience with the cast cutting tool, as I had a leg cast removed in 1967 because of a motorcycle accident.  [smile]

I remember it was white in color but I never looked for the manufacturer name on the tool as it was a scary enough proposition to watch the doctor cutting a plaster cast off of my leg. The blade broke through the cast in several places and all it did was tickle...that was a relief.  [big grin] [big grin]

One of the first things I did when I purchased my first Fein, and it was this exact model, was to install the round metal cutting blade and try it on the palm of my hand...it still tickled.  [big grin]

« Last Edit: June 22, 2020, 03:22 PM by Cheese »

Offline Michael Kellough

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Re: Festool or Milwaukee Impact driver?
« Reply #43 on: June 22, 2020, 01:24 PM »
That’s the Fein omt I have. Still haven’t upgraded unless you count an M12 version. At least the blades don’t come loose on the little red one.

Offline ben_r_

  • Posts: 1309
Re: Festool or Milwaukee Impact driver?
« Reply #44 on: June 22, 2020, 01:57 PM »
Yea Milwaukee all the way these days. Then maybe Bosch or DeWalt depending on the models.
If at first you don't succeed, redefine success!

Offline Jiggy Joiner

  • Posts: 1111
Re: Festool or Milwaukee Impact driver?
« Reply #45 on: June 22, 2020, 02:52 PM »
@Cheese Apart from you getting injured that’s a nice story. I can remember as a kid watching my pal have an arm cast removed with such a tool. When the nurse switched it on, my pal and me looked at each other wide eyed and gulping. In fact I think he shed some tears then, the nurse laughed and said don’t worry.
As soon as she got a little way in, he too giggled as it tickled so much  [big grin]
« Last Edit: June 22, 2020, 02:55 PM by Jiggy Joiner »

Offline yetihunter

  • Posts: 749
Re: Festool or Milwaukee Impact driver?
« Reply #46 on: July 11, 2020, 10:35 PM »
I am curious to know how, in the world of hammer drills, the Festool DRC 18/4 holds up against the competition?

Regards from Perth

Derek

The PDC 18/4 is the combination hammer drill, the DRC is the drill/driver only version.  The PDC I had worked surprisingly well in brick.  It was quicker than some corded combination drills I’ve used way back (metabo, bosch, dewalt) but can’t compare to modern cordless contenders in that area as I normally purchase the non-hammer versions (DRC was not sold here).   There’s a lot of good cordless sds rotary hammers on the market, and so that’s what I lean toward for the hard stuff.    As a drill/driver it’s showing it’s age as an old Protool product.  The competition has more powerful drills at roughly the same size or a bit bigger.   It’s exquisite like the T18 and C18 but it’s also just about the same power category. 


To the op, I’d take the latest flagship Milwaukee or Makita 18v impact over any other brand. 
« Last Edit: July 11, 2020, 10:37 PM by yetihunter »

Offline derekcohen

  • Posts: 468
    • In The Woodshop
Re: Festool or Milwaukee Impact driver?
« Reply #47 on: July 12, 2020, 09:40 AM »
Thanks for the info. I should have mentioned it was the PDC and not the DRC.

I was after something a little more powerful than my C12, which has been perfect in the workshop, where it gets light use. A lightly used PDC was offered to me cheaply and, although it seemed over-kill, I decided to go with it. It is a powerful drill, and I wondered how it held up against other impact drivers. I also wonder where someone would use the high speed end?

Regards from Perth

Derek

Offline ear3

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Re: Festool or Milwaukee Impact driver?
« Reply #48 on: July 12, 2020, 09:48 AM »
@derekcohen High speed with the PDC is most useful when engaging the hammer drill mode.  For normal drilling, I find it a bit too fast for driving fasteners, and it can also overheat drill bits.  But I do use speed 4 when drilling pocket holes.

Thanks for the info. I should have mentioned it was the PDC and not the DRC.

I was after something a little more powerful than my C12, which has been perfect in the workshop, where it gets light use. A lightly used PDC was offered to me cheaply and, although it seemed over-kill, I decided to go with it. It is a powerful drill, and I wondered how it held up against other impact drivers. I also wonder where someone would use the high speed end?

Regards from Perth

Derek
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Offline six-point socket II

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  • formerly @the_black_tie_diyer
Re: Festool or Milwaukee Impact driver?
« Reply #49 on: July 12, 2020, 10:06 AM »
Thanks for the info. I should have mentioned it was the PDC and not the DRC.

I was after something a little more powerful than my C12, which has been perfect in the workshop, where it gets light use. A lightly used PDC was offered to me cheaply and, although it seemed over-kill, I decided to go with it. It is a powerful drill, and I wondered how it held up against other impact drivers. I also wonder where someone would use the high speed end?

Regards from Perth

Derek

Hi,

the PDC is a percussion drill (with hammering switched on), not an impact driver. Impact blows on the PDC are axial, not tangential (impact driver/wrench).

I use the 4th gear with Festool CE Stone drill bits for drilling into masonry. Most of the time hammer/percussion mode switched off. No overheating with the CE Stone drill bits.

It's also useful for small diameter drilling, 2, 3 & 4mm with HSS drill bits into wood.

Not at all for driving screws/bolts.

Kind regards,
Oliver
Kind regards,
Oliver

"... . Say yes to stuff, and it will take you interesting places." - Anne Richards, CEO Fidelity International

Offline Cheese

  • Posts: 7511
Re: Festool or Milwaukee Impact driver?
« Reply #50 on: July 12, 2020, 11:09 AM »

It's also useful for small diameter drilling, 2, 3 & 4mm with HSS drill bits into wood.


If you look at a typical speed chart for drilling wood with HSS twist drills, for drill diameters from 1/16" - 3/16" (1.5 mm - 5 mm) the recommended rpm is in the 3500-3000 range. Perfect for the PDC in 4th gear.

Brad point drills require about 1/2 of that speed.

Offline Alex

  • Posts: 6629
Re: Festool or Milwaukee Impact driver?
« Reply #51 on: July 12, 2020, 11:29 AM »
If you look at a typical speed chart for drilling wood with HSS twist drills, for drill diameters from 1/16" - 3/16" (1.5 mm - 5 mm) the recommended rpm is in the 3500-3000 range. Perfect for the PDC in 4th gear.

The high RPM of the PDC is very nice to work with.

But I don't understand why such a high RPM is recommended, my T15 at 1500 RPM manages just fine with any size drill up to 12 mm in any material.

Offline Cypren

  • Posts: 35
Re: Festool or Milwaukee Impact driver?
« Reply #52 on: July 12, 2020, 06:04 PM »
For what it's worth, the Pro Tool Reviews site has the most comprehensive tool shoot-outs I've seen if you're wondering how the various brands stack up for particular tools. They're good about providing all of the test result data as well as commenting on the subjective aspects so you can make your own decision instead of just relying on a single subjective review score from them.

Here's their guide for hammer drill/drivers: https://www.protoolreviews.com/buying-guides/best-cordless-hammer-drill-head-to-head-review/45247/

Overall, they gave the nod to DeWalt as having the best-performing drill in the heavy-duty class by a hair, but note that all of the contenders in that category are essentially equivalent. The Festool PDC 18 was a bit of an interesting case; by the manufacturer's claimed specs, it falls into their light-duty category, but its performance in the tests caused them to re-class it as a medium-duty drill. In that category, its performance was inconsistent: it had the worst performance under load in the wood-drilling tests but the best performance in the concrete-drilling test by a large margin. (As they note in the detailed review of the PDC, its performance in concrete drilling was so far ahead of the rest of the pack that they re-tested it several times to make sure it wasn't a fluke.) They dinged it very heavily for value -- a fair knock, since it's about 3-4x the price of most of its competitors -- but also note if you read their stand-alone review that the build quality and polish level of the tool are a cut above everything else in the pack.

Offline JimD

  • Posts: 455
Re: Festool or Milwaukee Impact driver?
« Reply #53 on: July 12, 2020, 09:07 PM »
I have the M12 Surge and I like it.  I have never used the Festool impact.  My only other 1/4 impact is a Ryobi which works OK but differently than the Milwaukee.  The Surge has several levels of torque.  If you turn it down, you have to beat on it a bit to strip out a smaller screw.  If you turn it up, you can easily drive a 3 inch screw.  I'm used to backing off on little screws once the impacts start but I think Milwaukee's way of doing it is better.  I am just not completely used to it yet.  (My most recent usage was on my dock and I use the Ryobi there just in case it gets dropped)

Offline yetihunter

  • Posts: 749
Re: Festool or Milwaukee Impact driver?
« Reply #54 on: July 13, 2020, 12:03 AM »
If you look at a typical speed chart for drilling wood with HSS twist drills, for drill diameters from 1/16" - 3/16" (1.5 mm - 5 mm) the recommended rpm is in the 3500-3000 range. Perfect for the PDC in 4th gear.

The high RPM of the PDC is very nice to work with.

But I don't understand why such a high RPM is recommended, my T15 at 1500 RPM manages just fine with any size drill up to 12 mm in any material.

@derekcohen would know this answer better as he is a humble woodworking master but the smaller drills you go fast in metal to get them through as fast as possible before you get work hardening of the material and the big bits you go slow to minimize work hardening (this has to do with heat dissipation and size of drill) for wood drilling with HSS and regular ol’ tool steel the recommendations are similar to protect the drills themselves from the heat.  These recommendations work out nicely as it obviously takes longer to drill a hole the larger you go.  At least that’s as far as I know.  I won’t get mad if I’m told I’m misinformed.


Offline Cheese

  • Posts: 7511
Re: Festool or Milwaukee Impact driver?
« Reply #55 on: July 13, 2020, 01:10 AM »
I was going to answer this question from @Alex earlier but then life got in the way.  [tongue]

This phenomenon started for me when I was breaking 3/32" drill bits when drilling hard maple with a cordless drill. Specifically the CXS...which only spins up to 1300 rpm. I determined that I was putting undue pressure and more importantly a side load on the drill bit because it was drilling so slowly.

In order to prove this I installed the same Milwaukee 3/32" drill bit in the drill press and turned the speed up to 1200 rpm. The drill bit drilled the hole without breaking but it was a slow process and it needed a lot of pressure to complete the task. I determined that because there was no side load from the drill press, that was the reason the drill bit didn't break.

This result got me to look up drill speed tables for twist drills in wood and I was surprised at the results. A 3/32" twist drill was supposed to revolve at 3000 rpm for max efficiency.

I thus changed the speed on the drill press to 2800 rpm (max speed) and was amazed at how much easier the drill penetrated the hard maple.

This has completely changed my work process. I now use the CXS for installing screws and drilling larger holes while smaller holes are drilled with a Milwaukee cordless that will spin up to 1800 rpm.

At 1800 rpm I'm no longer breaking drill bits. It would be interesting to be able to ramp the speed up to 3000 rpm and to evaluate the results. However, I don't own a PDC.

This is just one of the reasons I'd suggest that Festool update the CXS, it's extremely long in the tooth and would dramatically become a better drill if it was updated to current competitive drill specifications. It was the best of the best when it was released but that was 8-10 years ago, that's a long time ago.  [sad] [sad] [sad]
« Last Edit: July 13, 2020, 01:41 AM by Cheese »

Offline Cheese

  • Posts: 7511
Re: Festool or Milwaukee Impact driver?
« Reply #56 on: July 13, 2020, 02:04 AM »
...you go fast in metal to get them through as fast as possible before you get work hardening of the material and the big bits you go slow to minimize work hardening (this has to do with heat dissipation and size of drill) for wood drilling with HSS and regular ol’ tool steel the recommendations are similar to protect the drills themselves from the heat.  These recommendations work out nicely as it obviously takes longer to drill a hole the larger you go.  At least that’s as far as I know.  I won’t get mad if I’m told I’m misinformed.

That's really not a concern with common cold/hot rolled steel but it is absolutely a problem with stainless. That's the reason you want to use cobalt drills on stainless. Feed the drill quickly into the stainless without producing too much heat, never let it dwell. Get in and get out. Attacking stainless is a better method than approaching it slowly. As soon as the drill bit dwells on the stainless for 2-3 seconds, it becomes work hardened and you've then got to break through the work-hardened strata which sometimes requires a carbide end mill.  [tongue] [tongue]
« Last Edit: July 13, 2020, 02:15 AM by Cheese »

Offline Michael Kellough

  • Posts: 4820
Re: Festool or Milwaukee Impact driver?
« Reply #57 on: July 13, 2020, 09:39 AM »
Long ago I used a high speed 1/4” corded drill in the shop for pilot holes. No load speed was 4K but it probably slowed close to 3k in use. When I bought my first 1/4 hex impact driver (Hitachi, around 1986) it was used for pilot holes, even though hex shanked drill bits are only fair to poor quality, or too short (Milwaukee).

Now I have a really sweet Metabo 18v drill that spins 4K. Using that for pilot holes is like simply injecting holes in wood. Push the button and it’s done. Except in very resinous stuff. Then the debris clogs the flutes (if the hole is deep) and the bit can’t eat anymore.

Online rst

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Re: Festool or Milwaukee Impact driver?
« Reply #58 on: July 13, 2020, 09:44 AM »
I furnished plastic to a stainless manufacturer, he taught me to jog the bit with high pressure to avoid bit destruction.

Offline yetihunter

  • Posts: 749
Re: Festool or Milwaukee Impact driver?
« Reply #59 on: July 13, 2020, 08:43 PM »

Now I have a really sweet Metabo 18v drill that spins 4K. Using that for pilot holes is like simply injecting holes in wood. Push the button and it’s done. Except in very resinous stuff. Then the debris clogs the flutes (if the hole is deep) and the bit can’t eat anymore.

It helps that while in 4k rpm, it has more torque than the similar Fein ASCM 18 and Festool PDC on their slowest setting. I would know, I've owned all three.  [big grin]