"I may just have the smallest tool you've ever seen!" Mark Serbu, 2023

Total dedication to the work - "This is what I'm doing at 10 o'clock on a Saturday night." Gotta love this guy.

CNC machining is so cool, especially when it allows you to do things that are basically impossible with a manual machine.

OK. How about a ten speed, peddle powered. 50 bmg Gatling gun.? Keeping with the bicycle spoke engineering... That's an awesome machine that you have there..

27 minutes vs. a broken tap. That doesn't sound like much of a choice to me.

Very cool to see this tiny tool. Did not know such a thing existed.

I LOVE tapping tiny holes!!! Really interesting video, Thanks

@bunnykiller

11 ай бұрын

takes a tiny tool to tap a tiny hole....

Shrink fit tooling might give you a better tool life on those lil guys ... I would imagine collet run out is an issue.

I have no idea why your this channel popped up, but I watch every video you post at this point. It's art and work. I love this kind of commitment to a craft - Mark Serbu, you're a badass!

@AldoSchmedack

9 ай бұрын

He's the modern Paris Theodore or JMB. And yes I mean that Mark if you read this. You are up there.

If anyone could mix bicycle and .50 BMG its you.

@quiettime6871

11 ай бұрын

The .50 BMX

@Sman7290

11 ай бұрын

Cycle of Violence?

@Tunkkis

11 ай бұрын

​@@Sman7290 _Ring ring!_

Thank you Mark, I'm just blown away by how far the tool and die trade has changed in the last few(30) years! Very cool and I'd love to see more.

Seems like the bicycle spokes are a solution in search of a problem. Sure, they're cheap, but now it takes 4x as long to mchine. A bolt on handguard like BCM/Aero or clamp on like Midwest Industries uses would be a much faster and cheaper option in the long run.

I love your cool and nerdy videos, so I can excuse your bicycle riding weirdness, LOL (hey, it's all good, I'm a 58 year old guy who rides a bicycle around town too), Have an awesomeness week, Mark.

CNC has made so many things easier for everyone. This was a very interesting video thank you for sharing this six stars

@afterthought3341

8 ай бұрын

Also even basic 3d printing to prototype your design has saved dollars before machining.

Waiting for an ejector video where you will show us how to make such stuff with a file and a vise.

I go to 50-55% thread depth for taps in steel. There’s negligible increase in thread holding strength over the pitch diameter, and it saves a ton on taps.

Man mark, your stuff never ceases to impress me. Keep it up brother! 👍

Question. Couldn't you drill, and tape larger, easier, faster holes that accept serviceable prefab bushing that also thread in, made of brass, steel, or aluminum even. Then have the bushings with flat head slots. That way if one of those spokes strip, or break off you can use a flat head to just remove them and replace it? That or have some recessed nuts on the rear. They too could be serviceable. But, I get it. It's a small part. May be easier to chunk it and buy another I guess too. Not sure how vital and expensive the part is. But yeah just curious Thanks

I was told as a watch stander in the Navy that you had to trust your gauges. Guess you have to trust your CNC to do the job for you.

@Sman7290

11 ай бұрын

Trust? Yes. But also verify.

@AldoSchmedack

9 ай бұрын

No alternate for true metrology. Gauges and mikes are never going away.

I've done a lot of cutting threads with those sumo bits. Love them. Edit: And yes, I have seen and used smaller tools :)

i found when drilling a 20 inch hold down a hardened bar of 220'000psi tensile 4340, the cutting bits really only work by slowly scratching the surface away needing to be sharpened every inch or two... hardened 4340 cutting but the cut chips come out as powdered steel. "20 inch line bore some old axle that had a minimum elasticity of 128'000psi, HSS cobalt bits out of a engineering firm in NYC". can do... with a 3hp modified drill press for line boring, but the feed depth perception is slow... about 8 hours for a 20 inch long 1/4 inch pilot, another 8 hours to run that to 10mm... the bit doesn't cut faster being on a bigger machine. cutting stuff that is twice as hard as tungsten...

I would use a turned small thread inserts and make the a reasonable size thread on the actual parts, then just thread the inserts in with some locktite. Shouldn’t be difficult to find a manufacturer for inserts with bicycle spoke thread.

Its like they say" it's not the size of the tool that matters, its how you use it!"

If its under 32Rc you can probably form tap it. Peck tapping with Moly-Dee usually works. I think SCT SPTM060 is the smallest I've used but they have a few smaller.

@partyalldaypartyallnight1057

11 ай бұрын

That's why I read comments before posting. Was curious if this part was already fully heat treated or not to require being thread milled. Some alloys work harden up so fast taps break all the time. Some 316ss jobs I used to run I hated running because of broken taps. They switched up the operations to single point them in the lathe or thread mill them on a vmc depending on what machines are freed up.

I’ve broke tons of these tiny tools 😢 thread milling is awesome

Once you got the spoke threaded in and wiggled it. I thought the same thing. Little loose. As small as that tap is it has to go 3 times over it, so as not to break it. Looking good so far Brother.

Machining! Gun parts!! Heaven!!!

Always amazes me watching the HAAS when it was hi speed threading. The spindle speed was nuts, but the tiny taps we were using held up to it.

It just feels to me like there might be a quicker and better way to thread those holes. But I don't have millions invested into machinery either. And I suppose breaking a tap inside there would cause even more problems. Keep up the great work.

DD ships one of these with the optic milling kit they have, first time I saw it I just stared at it for 20 minutes

@Tunkkis

10 күн бұрын

DD? Please don't tell me you mean FedCAD.

Really glad it worked. I've had seriously bad luck with tiny tools like that, especially drill bits and taps. Seems like I'm always getting poor quality no matter where I buy them from... because after breaking a couple almost instantly, I decided to check them and realized that they were all bent before I ever even got to use them, so as soon as they would hit steel (or even aluminum) they would break. It's still pretty amazing they can make such small taps/tools though.

Love the short insights thanks yet again.

Awesome. Looked at doing a little threadmilling, mostly because my little bitty CNC mill can't power tap.

Awesome demonstration. Thank you

Holy crap thats small and great job and i know only jewelry and watch maker's do things that small too

That is just crazy small. It makes me wonder , could you drill opposing holes through the trunion, with the rear side being large enough to fit pre existing spoke adjusters for bikes? Screw on the adjuster and slide the spoke assembly through so the adjuster is seated in the larger hole and spoke is supported by the small hole? Then tune as normal? Think guitar strings .

As a Johnny come lately to the party, what about using a form tap? A shop I worked at nearly exclusively used those over cut taps and they reused them A LOT. Especially small ones, if memory serves me correctly they were m1 and m2 taps. Now the caveat is this shop mainly cut 303 and 316 stainless if that means anything over what you're using for your receivers but they held up. Also not knowing what concentrate you keep your coolant at will come into play they just had there's at 10% more or less because they were too cheap to buy a refractometer. Another way to tap those holes since you probably have ridged tapping set up on your Haas would be to see if somehow your CAM software could peck tap, yes I said peck tap. At my first shop I don't know how he figured out how to do it on Esprit but our programmer made a successful post for a Mazak variaxis that tapped a deep hole with a cut tap and that was a nerve racking tool path to proof. Tap never broke for the entire order and every part passed the thread gauge and ironically was faster than a threadmill.

Very Interesting. Thank You for Sharing.

You could branch out into the watchmaker business with tiny stuff like that.

Why does the hole have to be so Small? I don't see why a larger hole and part wouldn't be more Durable and easier to make.

You might want to see if Gard Specialists has a tap that size. Their taps are some of the best I've ever used and have held up in materials they should have snapped in. Their drills and thread inserts are the best quality I've used too. Can't recommend them enough.

Lightly loose would be better than too tight because there is bound to be some tool wear which makes the holes smaller.

That plunge! Eeeek.

Good thing you called it the Mark II and not the Me too.

I used to run a 4flute 0.012" endmill.

Would it be faster to drill and tap for a 1/4-20 or 10-32 OD insert with the spoke threads? This would not be as elegant as the set up you have now, but a broken spoke would be easier to fix.

@AldoSchmedack

9 ай бұрын

Not on a critical trunion. Yes otherwise! Absolutely! Neat idea!

I do thread's like this with full length cutting teeth and 3 passes but with one revolution per pass, or you could roll tap them in 1 hit.

hey Marquito you got a tiny tiny tool hehe

When you were breaking taps, what % threads were you running? Most charts have it at 75% thread, which is optimized for soft materials. Hard steel you can go less l, like 50%. I had an issue trying to tap 2-56 holes in 304 stainless, and tried a bunch of things before we realized when can run less thread %. Once we changed that, it ran perfectly.

Thanks again

Hey Mark, is the thread a 2-56? Ive heard those tiny ones are a pain in the ass... Have you tried peck tapping? If you're not aware, you need to turn setting 133 (Repeat Rigid Tap) "ON". Then the gcode for the cycle is G84. Haas has a good video about it in their youtube channel.

Interesting. Thanks!

Godspeed I need to order that model when available

Good video, keep em coming. :-)

Mark Serbu's tiny tool going in and out 6 different holes at 10 PM on Friday night! Full video for patreon subscribers only!

Great video that shows how a part is machined by you at your machine shop rather than being subcontracted out to China or Pakistan where the quality is hit or miss!

I wonder what the lifespan is on it

Go fly something this weekend!

Would almost seem to me worth trying to find a set of bicycle spokes with self-tapping threads. I can imagine though mass production doing something like drilling the hole the size of the thread, milling a circular slot around it, and then feeding a custom machine that holds the spoke in place and uses a hydraulic press to jam an inverse conical forming die over the 'post' that was milled around and forming the metal into the existing threads without any precision thread cutting required. Or you could use a splined blind cap pressed in from the other side. Ugly, but effective. Or maybe a 'horseshoe' clamp made of mild steel that just sits on the other side of the aluminum, something thinner and much easier to use a regular tap with? I know it's not a quantity item but 27 minutes for a machining operation feels like it's a bit much.

So impressive

That is amazing to see i didn't realise thay went that small i really don't enjoy using small taps

It's not the size that matters, but what you do with it.

Привет из России, Марк! Hello from Russia, Mark! U r great!

Would it be more efficient to drill a through hole, and on the back side instead of the face machine out for a tapered threaded insert? That way the insert only gets tighter as more tension is put on the spoke? If the threads ever get boogered you could swap out the insert as well just by tapping it out from the face side. It should be user serviceable at that point. More parts, but perhaps more simple?

put some lock tight on it .

Carbide Tool Source sells a carbode thread mill for about half that price.

@cncmoldsnstuff4423

11 ай бұрын

Tried to post that three times. LOL

Ya know, some really high end boutique road bicycles use 'string' as spokes. Not actually 'string', more of some space-age polymer cord. UHWMP, I think. Obviously, in your application there could be a heat issue, but it makes me wonder... Kevlar spokes? Spectra? raw carbon fiber (not matrixed in epoxy)? Hmm...

Little ocd tweak to box around "mk II", angle the roman numerals or turn box into a rhombus so charachters and border are not parallel and it doesn't looke like "mk III" at quick glamce

Aerospace machinist here. That is all

Just curious, wondering if a conventional 3 flute tap be safer. Taps always work well if you get proper chip clearance. So reverse your set up and from bottom up so your chips will clear. I'm sure thats at least a 5 axis machine so it should do it. Just a thought from an old machinist.

Lol, sounds like a personal problem

Do you try forming tap, it’s work amazing

Get a good tap. Look into a thread former too. Its like s tap, but its not.

What are the small rods for?

Could you EDM a threaded hole this small with a form tool?

@joshuahuman1

11 ай бұрын

You could but it would probably take about the same amount of time and probably cost more as the form tools wear quickly. In this case you would probably go through 2 form tools or more per part.

That a harvey threadmill? Use alot of harvey single points at work but also alot of guhring roll taps down to 2-56 size they are awesome might be someting to look at to as long as you punch the hole the right size before hand and using them in TI and a286 is kinda sketch

“Tiny tool” lol definitely some nervousness using a tool that small

@markserbu What tap did you keep braking? I would use a forming tap on that all day long.

welllll... if you break it it wont be too hard getting the broken piece out of the hole... as compared to a conventional tap.

I don’t have that problem 😂

Badass

You cant power tap with a clutch with a drill press? Seems it would be a hell of a lot faster. I think cnc machines can power tap too, but i think the breakages are high without a clutch and through-spindle coolant.

@Butterchunks

11 ай бұрын

Although i forgot what grade of steel the trunnion is and how hard it is and if it work hardens. So maybe tapping is impossible

Heh, the "Mark" 2.

Are you designing and machining in imperial units?

“Tiny tool”? Have you been talking to my wife?!

Hey Mark, what would it take to make a 12ga Revolver handgun like the Taurus Judge?

Dang.

What brand and type of tap were you running?

Is it possible to design a single shot break-action .50BMG?

This is where commercial and military gun design go separate ways! If you are making something for mass productions those threads would never exist in that place ,whole part and gun if needed would be redesigned for simplicity and cheapness of manufacture. You cant make 5 million ppsh41 in 4 years if each has 6 tiny threads like that ,still its cool to see what todays's machines can do.

Modern Day MacGyver👌🇺🇸🙏

Thanks for sharing !

I think I'd make bigger holes and risk the tap.

Why not tapping them Mark?

I could tell by looking at you that you had a tiny tool!

@helidude3502

11 ай бұрын

🤏

@takeohtyme

11 ай бұрын

😂

What software is that?

Tiny tool? That's what she said.....

What’s the reason for those threads

👍🐿👍

do it manual 😅