Search found 272 matches

by Hans
Fri Jul 31, 2015 2:33 am
Forum: Discussion
Topic: SO3 Belt Calibration
Replies: 10
Views: 1186

Re: SO3 Belt Calibration

The technique described should be invariant of runout. Yeah, measuring left edge to left edge etc. but when I see "I cut a square" I figure we're talking left edge to right edge. I missed that the odd number was Z though. Like Catalin said, calibrate Z between milled surfaces. You'll have to mill t...
by Hans
Fri Jul 31, 2015 12:47 am
Forum: Tooling & Fixtures
Topic: Collet for 5/64" Drill Bit in DWP 611
Replies: 13
Views: 2389

Re: Collet for 5/64" Drill Bit in DWP 611

Anyone who's bought from drillman1 on ebay has probabaly seen the ridiculously thin PCB drills he sells. Drills for specialty applications go all the way down to a couple thousandths diameter. Obviously, you can't have a couple thousandths runout drilling a couple thousanths hole. Tiny drills actual...
by Hans
Thu Jul 30, 2015 12:06 pm
Forum: Discussion
Topic: SO3 Belt Calibration
Replies: 10
Views: 1186

Re: SO3 Belt Calibration

Have you tried other sizes of squares? You can't assume the endmill is cutting exactly .125".
by Hans
Tue Jul 28, 2015 7:17 pm
Forum: Rotary Tools (like dremel)
Topic: Which bit to drill into smartphone screen?
Replies: 10
Views: 6115

Re: Which bit to drill into smartphone screen?

I don't think that cracking or melting will be a problem for a single hole in cast acrylic. Use a sharp tool, just use enough force to make the cut, avoid high spindle rpm if you can, and a drill press will make it go smoothly.
by Hans
Tue Jul 28, 2015 6:50 pm
Forum: Discussion
Topic: Sudden endmill breakage and solution
Replies: 6
Views: 663

Re: Sudden endmill breakage and solution

Any light oil will do (I think air tool oil would be pretty good). WD-40 will leave an undesirable waxy buildup if squirted in somewhere repeatedly and not wiped away, but if you're putting it on a clean rag or a q-tip and just wiping out the taper, I don't see how it could be bad.
by Hans
Mon Jul 27, 2015 3:59 pm
Forum: Discussion
Topic: Help with locating the proper term... Locking angles
Replies: 14
Views: 1457

Re: Help with locating the proper term... Locking angles

Reading about it, I think the main advantage of a curvic coupling over a trapezoidal-tooth Hirth is that it's better-suited to manufacture via grinding (can be made to higher precision on the right equipment). For us, I can't see any reason to try and replicate that geometry. The big variable instea...
by Hans
Mon Jul 27, 2015 12:47 pm
Forum: Discussion
Topic: Help with locating the proper term... Locking angles
Replies: 14
Views: 1457

Re: Help with locating the proper term... Locking angles

Some people looking at a Hirth joint for their project might also want to consider a curvic coupling. It's the sort of clutch normally used in horizontal machining centers and other machines to precisely index to an angle and hold the position with extreme rigidity. Basically a more complicated geom...
by Hans
Thu Jul 23, 2015 4:42 pm
Forum: Shapeoko 3 Assembly
Topic: Black oxide washers?
Replies: 10
Views: 931

Re: Black oxide washers?

FWIW stainless hardware is better because black oxide coated steel will still rust from condensation over time.
by Hans
Mon Jul 20, 2015 2:47 pm
Forum: Software - CAD, CAM, Workflow Help
Topic: Cutting smaller than desired?
Replies: 22
Views: 1217

Re: Cutting smaller than desired?

Just as an FYI, technically what Carbide 3D is calling runout is just how much the cutter cuts oversize. Runout is actually something else, and isn't specific to machining. It's the difference between maximum and minimum radius on a cylinder as it's mounted in a machine. Of course on our machines, r...
by Hans
Mon Jul 20, 2015 12:54 pm
Forum: Software - CAD, CAM, Workflow Help
Topic: Cutting smaller than desired?
Replies: 22
Views: 1217

Re: Cutting smaller than desired?

There are a number of things that will cause an endmill to cut larger than the nominal diameter, including runout like Will said but also the actual size of the endmill (and the behavior of the material. Rather than changing the size of the part in Inkscape, change the tool size in MakerCAM. You may...