Broaching Internal Keyway - 30 Year old CNC Machine

[@Chiefs1582]

Seeing folks who's machines have probes and probe programs makes me super jealous I have to find and set the center of the part.

[@jobkneppers]

Thank you for sharing your work with us. Nice to see this old CNC machine perform like it should. One note on the design part of things; a key has an intermediate fit for both sides it connects to. Sliding in by hand as you did at the end of the video means too much play and the power which it will transmit will make this worse and endup with a failed hub or axis unfortunately. No nagging here, I liked watching your work, but it should be a light intermediate fit for the hub and the axis to perform well over time. Any clearance will "hammer" one or the other (soft goes first) to a failure or soundwise close to it. I hope this helps. Best, Job

[@themachinisst7856]

Thank you so much! This part was only to showcase the keyway operation and we didn't want it too tight for the video. We've produced some other parts and yes the key has to be hammered in with a mallet because of the tight tolerance. Glad you enjoyed the video!

[@HuskyMachining]

Beautiful filming!

[@lianlim9119]

Good keyway

[@zaq55555555555555555]

In the first 3 minutes regarding your coolant comment... super light cuts like that dont even need coolant to begin with. Using proper feeds and speeds, you can get the same surface finish and lead time without damaging an insert.

[@cassiusclay7482]

Super travail

[@eyefixityouification]

Nice job

[@GrImReApPeR99]

at first i thought oh thats a nice looking mazak it can't be 30 years old until the real 30 year old machine showed up lol

[@HM-Projects]

High pucker factor, turning the outer surface 2nd time around. Good thing CNCs can do it without blinking.

[@Yamahog]

Nothing like watching old-school broaching done on CNC....Back in my early days, to broach a KW, I actually used a broach and collar ... Think Butler broaching machine..., the shaft KW was still done by milling.... roughing end mill and finish off using a 4 flute slot drill. That shafting you used... just 1020 hot rolled or maybe 4140 ?? Anyways, Well Done.

[@themachinisst7856]

The shaft was 4140, nice and easy to work with. Glad you enjoyed it!

[@жекамастер]

Шпонка должна садится с натягом 0,02 мм.

[@bradwhitling]

What brand of tool is the broach?

[@themachinisst7856]

www.cncbroachtools.com

[@evgen4868]

30 лет станку? Моему 55 лет. 😜

[@Cheese_1337]

Тоже с чпу?? 🙃

[@abidhasan4730]

Hi really details videos. I am Service Engineer doing mechanical and electrical works. Have interest in programming side also can you please suggest how to learn programming. Really appreciate you advice .

[@nbprotocol5406]

mastercam

[@themachinisst7856]

As mentioned, Mastercam or any other CAM software will help, we personally use Fusion 360 (which has a lot of free options to get you started) and GibbsCam. Different machines also have different controls and programming options as for example, the conversational Mazatrol software from Mazak, or others, these are more user-friendly to program directly on the machine. And then there is G code, which is what most machines now a days still use besides their own software (and also what your CAM software is going to output in most cases) so its good to have a little understanding of it.

[@Yamahog]

@@themachinisst7856 I used G code back in my days. I think Haas still has educational programs available for those needing to learn basic and parametric programming techniques.

[@diepieche]

I'm thinking of doing it with edm.

[@themachinisst7856]

Haha fair

[@velyks5397]

That fixtures seen some shit

[@simskii.]

Ye, I also wondered. It was almost enough to trigger my trypophobia.

[@mrlovely77777]

Accuracy

[@edhver7694]

на фрезеровке паза мудацкие склейки. это что значит?

[@catalinbadalan4463]

Why one part was broached and the other just milled?

[@the7thelfjimmy885]

Machinist of 5 years now, from my experience broaching is mainly an I.D. Operation, where slotting a key way is an O.D. Operation. But I have seen broaching done both ways. I like a milled finish better

[@innominatum9906]

As Jimmy said broaching is usually for the I.D and milling a slot is often also a lot faster.

[@ghost2coast296]

because of the corner radius the tool leaves. If you tried to mill that keyway out it would need to have rounded corners, which is fine I guess but then you'd need to make sure the corner radius on the key is larger than the corner radius of the keyway

[@adammiller4879]

Wtf that is not okay to put a plunge indicator at an angle like that. Called cosine error, Put a test indicator in there’s.. you are gonna get a bad reading doing that. And oh god I’m Back after I saw the coaxe on the face 😳🤢🤦‍♂️ wtf. You are not a machinist, you just had a plunge indicator out !🙄 watch people gonna comment back this is okay, it’s not😂

[@Yamahog]

Translation for the new readers........Dial indicate work piece on X axis front to chuck, Tap with mallet if necessary to seat properly.... then dial indicate bore left to right to find center... then run on X axis to see if bore is concentric to outer surface, then true the bore with a boring bar. Seems pretty straight forward to me, BUT ... Strapping the dial indicator to the turret and trying to zero the center for run out isn't a good idea....the turret doesn't move on Yamazaki's ,( aka Mazak's), 90 degrees to the X axis.... more like 60 .... hence the Cosine drift. ( try it on paper or if those reading have a CAD program..... See if your center lines match up .... they wont.)... Nuff said.... Stay Safe.

[@hellspawn3649]

damn i didn't even notice , good catch.