CNC Fundamentals - Ep. 2 - How Machine Side the Bottom Side

oday we set up the machine to finish machining the bottom of the part we started in Episode 1!

Stay tuned for more CNC related educational videos.
Thank you to all of my Patrons and Syil America for helping make this video possible!

Links to items used in video:

End Mill #1 - YG Alupower - 375" Diameter 3 flute
End Mill #2 - YG Alupower - .25" Diameter - 3 flute

[NerdlyCNC]

Im aware the stock was a larger than necessary. It wasn’t worth dragging material off the rack, setting up the saw and then cleaning up the mess and de-burring 2-3 blanks for this short demo.

We could’ve easily just made this twice as thick the point was to demonstrate the process.

Cheers,
Jason

This demo part was made from some material that was cut for another project and never used.

[robinsondrob]

This is useful, not many people do the bottom side on here. Thanks or sharing

[machinists-shortcuts]

It's good practice to set the end stop close to the centre of the reference face. It helps with future referencing and negates any out of squareness.

[makun]

If you bend the metal bands that comes on crates into springs they make great parallel retainers.

[baxedm]

Can you share where you got your 11/16" x 14mm stepped vise keys? I'm assuming you use those to align your tegara 660U vise to the Syil table slots.

[johannglaser]

Would have loved to hear you voice over during the machining and discuss tool choice (why endmill and not a face mill), paths, ... and also explaining the steps by the machine, announcing next steps, ...

[mathavanpackirisamy]

Nice machining....
Why don't you ues face mill for remove material in roughing..??

[lilchirp]

What do you use to shrink in those tools?

[Chris]

I just rough off the salvage at the bandsaw. Fly-cut to final thickness. Then run the chamfer program for cleanup. If doing multiples, the material would be thick enough to run opposing sides then split and finish.

[BecomingOffgrid]

I cut all my parts 3 thou to short, what machine setting can I use to correct it?

[MrRctintin]

Hi, why did you remove the excess stock with an End Mill and then use a shell mill to finish? Any reason why not to just use the shell mill taking skims off until the desired height is reached?

[sunguyentien]

Hi, I tried to apply your method. However, I feel it very difficult to clamp the part completely flat on the parallel, means the top and bottom of my part are not parallel, it's usually off for almost 0.1mm. My best guess is it happened when I used the hammer to tap it down. Do you have any advices or tips? Thanks

[jurgenboucher]

I like the rubber band, especially on C-axis and A-axis 😉

[AmericanMakerCNC]

Thanks for all your great content! I have tried this 1-2-3 block trick with a vice stop several times without much success. The hat removal works great! But when I try to chamfer the bottom of the part, the left edge chamfer is always too deep or big and the right edge chamfer well there is none. The chamfer mill is too far off the right edge of the part and never makes contact. The only way I seem to have success is to touch off on the hat (G55) and remove the hat, and then touch off on the part (G56) for the chamfers. Do you have any ideas why the 1-2-3 block is a fail for me when it comes to the bottom chamfers? I would love to get this to work. It simplifies and speeds up setups. Thanks!

[johnspathonis]

Hi Jay Another great video! With the end mill are you using a DC12 collet?

[HH-Machining]

If you machined the part deep in enough in 1st OP, wouldnt face milling be faster to remove the excess material?

[eusebiupruna]

👋 hello, cand gove me some specs for milling aluminum pleae? As feedrate, rpm, etc. O have a small cnc machine from step-cnc and it doesn't sound too good when i insert what the books or standards say

[hey]

Why not just use the heimer and touch off on top of the parallels for z?

[gamble]

The only reason you use the 123 block then put the material is is because it's more accurate than just getting xyz0 off the stock part?

[tonycerniglia]

I enjoy watching your channel greatly, however, It would be so much better (informative) with information of the cut parameters... material, tool, speed, feed, radial and axial cut depths and so on. You may even be able to get cutters etc. from suppliers for test evaluations.