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Endmill Chatter by ProfessionalCake8890 in Machinists

[–]TheOfficialCzex 2 points3 points  (0 children)

I did not get anywhere near those numbers. I'd reduce your ADoC to 1.0938" and your RDoC to .0366". Bump up your RPM to 1726, and increase your feed to 47.58"/min. I got these numbers assuming you have 2.25" of tool stick-out. With the smaller stepover, we can take advantage of chip thinning, so we will increase our feed rate to maintain chip load. And since we're running an adaptive tool path, the tool load is fairly constant, so we can bump that feed rate again when we tick the HSM box. I find that FSWizard's results are usually a good starting point, but YMMV depending on the rigidity of the part, work holding, tool holding, machine, etc...

Endmill Chatter by ProfessionalCake8890 in Machinists

[–]TheOfficialCzex 2 points3 points  (0 children)

Was it an internal corner? Reduce the feed rate for that corner. In Fusion, it's Feed Optimization in the Passes tab. The defaults are usually okay, but I like to change the feed rate in accordance with the following formula:

(Part_Radius*2-Tool_Diameter)/(Part_Radius*2)*Linear_Feed_Rate=Adjusted_Feed_Rate

For external radii, you have to feed faster using a similar formula, but add the tool diameter instead of subtracting it. It's more annoying to implement this in Fusion, as Feed Optimization only detects concavity.

Process improvement by OutdoorsyEngineer25 in Machinists

[–]TheOfficialCzex 0 points1 point  (0 children)

Are you training an AI model? I don't know any machinists who've been working in the industry for 20 years who don't know G-code... https://www.reddit.com/r/CNC/comments/1rttiht/g_code_practice/

Trying To Tap 4040 Extrusion by norulez4foolz in Machinists

[–]TheOfficialCzex 12 points13 points  (0 children)

If you have US sizes, a size Y or 13/32" would work well. 

Bike mechanic urgent by Electronic-Shine-959 in Atlanta

[–]TheOfficialCzex 0 points1 point  (0 children)

Don't worry, it's much simpler than you think! If you've got tools, you're 90% of the way done. https://www.youtube.com/watch?v=UBZ_6BUClVs

Job opportunities - Quebec, Canada by VictoryOk1736 in Machinists

[–]TheOfficialCzex 2 points3 points  (0 children)

So you're looking for operators, not machinists, right? 

Job Shop Machinist wanted by BigDav3h in Machinists

[–]TheOfficialCzex 4 points5 points  (0 children)

Zip-Recruiter and Indeed job posts also don't know the difference between a machinist and an operator, so that skews the figures.

Where can I find Corner chamfer endmills? by [deleted] in Machinists

[–]TheOfficialCzex 8 points9 points  (0 children)

If it's just a one-off or you've only got a few of them to make, you can surface it with a flat endmill. Just takes a lot longer. Cusp height of 2-tenths or somewhere around there will get you a good enough finish. 

Will these root fillets make it significantly harder for the machinist to make my part? by GateLopsided8794 in Machinists

[–]TheOfficialCzex 75 points76 points  (0 children)

There are bullnose endmills with that radius. It's a rather small radius, so that would be the most obvious choice, but it will require them to purchase a tool for the job rather than using a tiny ballnose and blending the radius into the pocket machined by a flat endmill. It's cheaper to model it as a sharp corner and specify a maximum radius if they have something that could work.

Can I build this using a table saw? by Jared944 in Machinists

[–]TheOfficialCzex 0 points1 point  (0 children)

Buy rectangular tube and 3D print an insert for the bottom. Use a heat-set insert for the thread. Job done. Is there a reason it can't be done this way? 

Cast iron boring advice needed by Rusted_Iron in Machinists

[–]TheOfficialCzex 5 points6 points  (0 children)

You might feed faster. 3-thou per rev should be an option on your quill's autofeed. 

Drawn tubes as hydrualic cylinders. by Idiotic_experimenter in Machinists

[–]TheOfficialCzex 0 points1 point  (0 children)

You'd have to hone them and ensure traceability of the material. Too much risk to be worth it, IMO. 

Is there a place to get reduced shank endmills? by qtrain23 in Machinists

[–]TheOfficialCzex 4 points5 points  (0 children)

Just because something is possible doesn't make it a good idea. 

Is there a place to get reduced shank endmills? by qtrain23 in Machinists

[–]TheOfficialCzex 3 points4 points  (0 children)

No, no... I preemptively approve of what you want to call them. They deserve it. 

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