MONDO 52T Sprocket // paul brodie's shop

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#bicycle #cutom #sprocket #fussyframebuilder

[@Krotte96]

Good metal, sharp tools and sharp thinking. Combine that with skill and experience, what do you get? "That's a good fit". Excellent as always with camera work and editing to match!

[@paulbrodie]

Thank you. Yes, Mitch does a good job on the editing...

[@joell439]

Thanks Paul and Mitch - glad you're out riding. Be safe too!

[@paulbrodie]

Thank you. I tried to be safe, but I am 69 and still manage to fall off my motorcycles... Ouch!

[@xpndblhero5170]

I'm waiting for you to try and make a narrow wide sprocket for one of these bikes.... That would a great video idea. 😉😉 😁👍😂

[@paulbrodie]

I bought a brand new 34T narrow wide sprocket yesterday for $20. I usually only make stuff that I cannot buy.... Thanks for watching!

[@xpndblhero5170]

@@paulbrodie - Nice.... You're Welcome. 😁👍

[@willgrime]

Paul, I only recently discovered your vids, and I’m deeply immersed and learning a HUGE amount I wish I’d know years ago. I never considered an aluminium sprocket was a ‘thing’, but I guess it’ll last long enough and perhaps reduce chain wear as well if you’re using one. Do you do any special hardening to increase tooth durability (and is that even possible on aluminium)? And have you ever considered a bimetallic sprocket with a ring of steel teeth on an aluminium centre, like a car flywheel? I love your design work too - clean, elegant and rational. I was an architect and teacher all my working life and seeing design skill like this is deeply pleasing. Cheers, Will

[@aidanearl]

It's good you've recorded it this time, in another 11 years it will be good reference.

[@paulbrodie]

What happens 11 years from now? I wonder if Mitch and I will still be making videos?

[@aidanearl]

@@paulbrodie I hope so 👍

[@allanrichards3752]

As for that "ringing" of the sprocket in the lathe I used to use plasticine on a lot of thin walled aluminium castings I had to machine back in the day. It is good at changing the natural frequency of the part so it does not chatter so readily.

[@ultimatemonkey]

Pretty unrelated to this project specifically, but boy ohhh boy is the sound of the quill topping out on the return up ever satisfying! Quality machines just have something about the way they sound 😏

[@paulbrodie]

I guess for me it is just a part of the Shop Ambience. Thanks for watching!

[@thomaslowry7813]

The look of accomplishment when you realized you might not need the allen screw 🤣

[@paulbrodie]

The Allen screw is the insurance policy. I'm glad this Day of Machining went fairly smoothly. Thanks for watching...

[@jamest.5001]

From E.B. to T.B. and back again. I understand totally, growing up my dad and I would do the same with old cars. Sometime as far as swapping engines, so the other car can be driven for a few years , that's the beauty of old cars, 50's -60's they were the same essentially! Some ppl don't understand that, or how cars can become who you are, they are part of your soul, taking them away is WORSE than killing them!

[@paulbrodie]

Are you sure you commented on the right video? There are no cars in my shop!

[@Paddington60]

Thank you Paul and Mitch.

[@paulbrodie]

Thanks for watching....

[@constantinehatzis2807]

Poor tree! Beautiful sprocket. I was just imagining the challenge of a biopace type sprocket.

[@paulbrodie]

I think the tree did fine. Not so much my rib... I used to use Biopace a Lot in the 1980's, in conjunction with 180mm crank arms. Times have changed!

[@murdoc6501]

Amazing to watch a master at work! The design process, calculations and execution are awe inspiring! Go Paul and Mitch, keep moving forward!

[@paulbrodie]

Thank you! Yes, we will keep moving forward as best we can...

[@karlalton3170]

Very precise work Paul , Awesome job mate 😁😁🤘🤘

[@paulbrodie]

Thank you! 😄😄

[@stephenwilliams926]

When they turn brake discs and clutch fly wheels, they stick a big elastic band around the diameter to stop it ringing.

[@DavidM2002]

Well done once again Paul. FYI, there are a number of gear and sprocket apps available to create your own sprockets. I don't use them very often but they can be handy especially if you have a CAD program as well so you can customize things like the center holes, mounting holes, etc. One is Gearotic. It's not too expensive but there are others.

[@paulbrodie]

Thanks David. I do not currently have a CAD program, but great of you to comment...

[@georgedreisch2662]

Might try a annular cutter instead of a hole saw for lightening holes. Thinking it would give a more accurate / cleaner hole, and save the boring head operation. Thanks for sharing.

[@danielneubauer2306]

You should totally make a super-cut of all the moments where you said "That's a good fit!" or you just eye-balled something and it turned out perfect! I love those moments! 😆

[@paulbrodie]

Thanks Daniel. Yes , sometimes I do have luck and a part turns out perfect...

[@scotta.3866]

Paul, I'm glad to hear that you've been able to get out on your TRS. I hate it when the trees hit me! 🙂

[@paulbrodie]

Yes, I have been enjoying riding in the woods on my TRS. Very good bike!

[@rogercamp2910]

Looking good Paul

[@hookerjl1]

Right time, right place and right tools…that’s all you need to be the lucky one👍🏻😎…and a coffee I guess😉

[@paulbrodie]

Coffee! Did someone say coffee? I was the lucky one because nothing went wrong..

[@goawaytours]

1/3 of a human hair is roughly half a baw hair in Scotland. That’s a perfectly acceptable tolerance to work to.

[@paulbrodie]

I agree. Thanks for watching!

[@kenmcdonald7793]

Around 11:00 min in, the chatter reminds me of a Pink Floyd song.

[@paulbrodie]

Well, I am a big Pink Floyd fan too! Thanks for watching...

[@jamest.5001]

Having a small mill that mounts on the tool post, would be something, have a spinning end or face mill could be cool , it using a 3-4hp spindle motor running up to 28k rpm motor, and 6-9k spindle, using a 6phase brushless motor, essentially two 1.5-2.5hp bldc motors on a single shaft using a 144-180vDc power supply (rectified 120vac, stored in a large capacitor! With the poles set up as a 6 phase motor, with the MOSFET drive H bridge per phase to produce a great TQ per revolution. Like the difference between v6 and v12 of equal displacement, the 12 will produce more power. The greater TQ used to make heavy cuts in hard steel, also being a tool post grinder. I hope to get atleast a small bench top lathe and mill so I can build one maybe build a large lathe and mill also. A bit ambitious, but seen it done! Have an awesome day!

[@davidharris5736]

​ @paulbrodie Great sprocket and hair. You're lookin good Paul! Reminds me of when I had cancer and grew a pigtail.... Maybe you should consider that Paul?

[@Alanbataar]

Hello Paul & Mitch - thank you as always for the informative video! The thought of making a sprocket fills me with dread. I don't have a good record with my rotary table. I often have issues using degrees and minutes (Base 60 math? What?), and I don't have a dividing head, so I'm stuck with the weird math. :) Also, if you were to use the rotary table to make those finishing cuts instead of filing, what would the process look like?

[@m.m.7511]

You need some small machinist jacks paul... to cut those overhanging stuffs...

[@TheUncleRuckus]

Should've went with a Skip Tooth Sprocket, it'll keep your chain from coming off, as the chain meshes with the sprocket better. 👍👍

[@ragnarironspear1791]

Brilliant channel 👍🏻👍🏻👍🏻🇬🇧

[@tomfortson5147]

Hey Paul and Mitch, nice job on the 52 tooth sprocket! The chain looked a bit snug in the trial fit. With anodizing, will it be too tight? Or, when you file it, will that ensure a good post-anodize fit???

[@salvadorsepulveda6415]

Beautiful work, Paul, and those ribbons coming off the cutters are satisfying 🎉

[@jobkneppers]

Paul, if you ask the anodizing company to maintain your dimensions they can do that really accurate. They etch a certain amount of and add the anodising the same amount. I do this for many years now and it never failed even hard anodized parts. If the company is any good of course but knowing you they probably are. For the rotary job; when you mounted it you should start to determine center as a zero, zero coordinate. From there you could have drilled all the mounting holes in one go. I think you just forgot to start that way. For milling the outside diameter of your plug you didn't need it. Just mill, measure and shift your tool to size in maybe a few steps. For the teeth I would mill a tangent with a small endmill at an angle and repeat with the minus angle for the other side of the tooth. I guess you did it like that on your example. Thank you Paul! Best! Job

[@cest7343]

Hopefully the tree wasn't going too fast 🙏. Great "can't buy that" sprocket execution!

[@raharold]

Thanks!

[@Hertog_von_Berkshire]

It's a while since I learned involute geometry. It's one of those "use it or lose it" things and I've never used it. Besides, only the math was taught, not the cutting process.

[@ccbproductsmulti-bendaustr3200]

Sprocket 👏👏👏👌 We bruise easier and don’t heal as fast when we are older Cheers Chris

[@BeardedWebb]

You know, I always did want to know how to machine a sprocket. This video is fantastic.

[@bananabrooks3836]

What's happened to the Tiger Cub?

[@paulbrodie]

The little Tiger Cub is still here! It has been hibernating over winter, and spring is almost here. Time to get her running and do a start up video...

[@definefreedomfdm-travels1008]

You can put a rag or rubber band like an innertube behind the plate. It will absorbe the vibrations.

[@agafonovas]

You could maybe superglue it on to some backing plate

[@bearbones4347]

How much does that cost ? 2gs u lower people to steal from them ?

[@rotax636nut5]

Got lucky with boring out that centre then Paul

[@crispy-steven2076]

Dope

[@_MattyG_]

Trees, are killers. Watch out Paul!

[@carlhitchon1009]

Jesse man, be careful. We like you.

[@pradipchauhan211]

Spoket tith hardesh video please

[@scottcates]

Fantastic

[@paulbrodie]

Thanks Scott...

[@prillewitz]

Bruised ribs are painful I can agree. Glad to see you back on YT. Take care, best regards from The Netherlands.

[@paulbrodie]

Thanks Peter. I am healing for sure...

[@lancehatch4475]

I really liked seeing how that was made. At first, I thought it was for the giraffe bike and then realized that it wasn't. So what will go on the giraffe bike? Will you make a crankset/chainring or did you buy one? I guess I should look at previous episodes and I will find my answer.

[@still_or_sparkling_band]

Thanks

[@marksun.7861]

⚙️⚙️⚙️⚙️⚙️👍

[@leonardarola]

52t on what?

[@PatFarrellKTM]

Nice video. Is the profile of the sprocket tooth an involute like a gear tooth?

[@chopchoppancake86]

Is aluminum to soft for a sprocket ?

[@bobhudson6659]

How long has Paul been making bikes? You can then work out the answer to your question.

[@Exgrmbl]

no, alu sprockets have been used for decades and decades for chainrings. They are ofc not as durable as steel, but they also don't unexpectedly fail or something like that. Generally, the bigger diameter a chain ring ie the more teeth it has, the less stress any individual tooth experiences. So you generally only see them in use up to certain sizes.

[@chopchoppancake86]

Doesn't matter how long Paul has been building bikes aluminum is still soft !​@@bobhudson6659

[@tomthompson7400]

Great stuff , always a joy to see a fresh video Not sure about the Mighty one '' flashing '' but its a small price to pay .

[@paulbrodie]

Thanks Tom. Have a great day!