Search found 268 matches

by samc99us
Tue Jan 19, 2016 6:01 pm
Forum: Tooling & Fixtures
Topic: What's a good basic end mill assortment kit?
Replies: 9
Views: 6748

Re: What's a good basic end mill assortment kit?

Secret 1: Buy the lowest flute count end mills you can source in the format for your application. You are already spinning a minimum of 16,000 RPM, and switching from a 2 flute cutter to a 4 flute cutter is effectively switching from 16,000 RPM to 32,000 RPM spindle speed. Not good because our machi...
by samc99us
Tue Jan 19, 2016 12:40 pm
Forum: Discussion
Topic: Shapeoko Machine capabilities and limitations
Replies: 59
Views: 7520

Re: Shapeoko Machine capabilities and limitations

So here is an example of what can be done with a machine of this caliber. I am new to machining having received my Shapeoko about 2 months ago. Since then I've leaned a bit of CAD, some CAM and spent some serious hours making the shapeoko as good as it can get.. Here is my first job: There are 9 un...
by samc99us
Tue Jan 19, 2016 12:20 pm
Forum: Discussion
Topic: Shapeoko Machine capabilities and limitations
Replies: 59
Views: 7520

Re: Shapeoko Machine capabilities and limitations

Trouble with expanding the machine, at least in the gantry direction and z-axis, is reduced stiffness. I am a little surprised that y-axis upgrades aren't available for the SO3.
by samc99us
Sun Jan 17, 2016 7:35 pm
Forum: Discussion
Topic: Shapeoko Machine capabilities and limitations
Replies: 59
Views: 7520

Re: Shapeoko Machine capabilities and limitations

Good data. Maybe worth looking at the ACME leadscrew x-axis and z axis. Belts or R&P are really the only options for y axis travel, since longer lengths=screw whip.
by samc99us
Sat Jan 16, 2016 9:20 pm
Forum: Discussion
Topic: Shapeoko Machine capabilities and limitations
Replies: 59
Views: 7520

Re: Shapeoko Machine capabilities and limitations

Look I'm not getting into a pissing match on the internet about engineering a $1000 CNC router. I actually agree with you, but please feel free to post your FEA. Solidworks FEA (the tool I had access to at the time) crashes more often than not when running an assembly. For this case, it's pretty saf...
by samc99us
Fri Jan 15, 2016 12:47 pm
Forum: Discussion
Topic: Using a Shapeoko3 to drill aluminum
Replies: 38
Views: 4144

Re: Using a Shapeoko3 to drill aluminum

Actually this looks pretty good on paper anyway: http://www.amazon.com/Konmison-Cooled-1-5KW-Spindle-Collect/dp/B018I40YXC/ref=sr_1_7?s=industrial&ie=UTF8&qid=1452861757&sr=1-7&keywords=air+cooled+spindle 3,000-12,000RPM. $200+VFD. Still not slow enough to turn large bits but getting darn close. The...
by samc99us
Fri Jan 15, 2016 12:41 pm
Forum: Discussion
Topic: Using a Shapeoko3 to drill aluminum
Replies: 38
Views: 4144

Re: Using a Shapeoko3 to drill aluminum

Ugra CNC has some spindles that are rated for lower working speeds: http://ugracnc.com/CNC-SPINDLES/GMT-Air-Cooled-CNC-Spindle-0.8-kW-380-V-6000-RPM-S.html To big for the SO2/3 but an idea: http://ugracnc.com/CNC-SPINDLES/GMT-Air-Cooled-CNC-Spindle-2.2-kW-220V-/-380V-6000RPM-S.html http://ugracnc.co...
by samc99us
Thu Jan 14, 2016 3:40 pm
Forum: Discussion
Topic: Using a Shapeoko3 to drill aluminum
Replies: 38
Views: 4144

Re: Using a Shapeoko3 to drill aluminum

One interesting thing I noted when shopping for spindles is most are listed as 0-24,000 rpm but usable 6,000 rpm and above. Anyone with a real Chinese spindle care to comment?
by samc99us
Thu Jan 14, 2016 3:36 pm
Forum: Discussion
Topic: Shapeoko Machine capabilities and limitations
Replies: 59
Views: 7520

Re: Shapeoko Machine capabilities and limitations

Yes, you are coming off fairly harshly. I have a background in Aerospace Engineering and do structural analysis of advanced composite structures for a living, among many other things. A router is a tool, not the end all-be-all. Yes, I understand deflection is additive. Care to post your calculation ...
by samc99us
Thu Jan 14, 2016 1:18 pm
Forum: Discussion
Topic: Shapeoko Machine capabilities and limitations
Replies: 59
Views: 7520

Re: Shapeoko Machine capabilities and limitations

A stock z-axis, yes. Mine doesn't flex that much, but the x-axis gantry twisting about the gantry itself is certainly on that order. Also, I typically do finishing passes at much lower loading, like 1lb of cutting force or less. That would result in 0.0025in of belt stretch according to your math, t...