Search found 11 matches

by jasonharper
Sun Sep 29, 2013 3:53 pm
Forum: Build Logs
Topic: #2014F - the Birth, life and fall of a machine...
Replies: 177
Views: 32687

Re: #2014F - the Birth, life and fall of a machine...

The easiest way to get more belt wrap around the pulley is to run the belt in a Z-shaped path around one idler and the pulley - the other idler can be removed as it's no longer really doing anything (I used it on the other side when I did the Y drive shaft mod). The belt ends up being mounted high a...
by jasonharper
Mon Sep 23, 2013 11:35 am
Forum: Electronics
Topic: non-stable position in inherited machine
Replies: 1
Views: 410

Re: non-stable position in inherited machine

That's a feature - it lets you easily set a zero position relative to your workpiece, manually (and a manually-set position is really the only position you have, on a stock Shapeoko with no limit/homing switches). If you don't like this - for example, when running a job that's going to require tool ...
by jasonharper
Thu Sep 19, 2013 1:16 am
Forum: Discussion
Topic: Advantages of non-center-cutting endmill?
Replies: 5
Views: 1444

Re: Advantages of non-center-cutting endmill?

So how does a center-cutting endmill work, anyway? I mean - what's the mechanism for removing material that's exactly on the axis of the bit during a plunge, where there is theoretically no sideways motion to do cutting? My only guess is that they rely on there being at least a tiny bit of runout in...
by jasonharper
Thu Aug 22, 2013 12:03 am
Forum: PCB Fabrication
Topic: What is my problem here?
Replies: 15
Views: 3345

Re: What is my problem here?

0.035" is over half the thickness of typical PCB stock! That's insanely deep for an engraving pass. If your Z probing is perfectly accurate, then 0.002" engraving would be sufficient for 1 oz. copper cladding.
by jasonharper
Thu Aug 01, 2013 12:17 pm
Forum: Software - CAD, CAM, Workflow Help
Topic: Strange behavior with Z Axis backing off a bit at each point
Replies: 17
Views: 2529

Re: Strange behavior with Z Axis backing off a bit at each p

What does the actual G-code for these drill operations look like? CamBam, for example, will by default generate a "canned cycle" (G82, I think) for drilling, which is NOT supported by GRBL. I would expect that to result in no drilling at all, rather than the symptoms you're seeing, but maybe somethi...
by jasonharper
Tue Jul 30, 2013 11:06 pm
Forum: Software - CAD, CAM, Workflow Help
Topic: Needing help wtih Eagle and pcb-gcode (OSX).
Replies: 14
Views: 3076

Re: Needing help wtih Eagle and pcb-gcode (OSX).

I'm not familiar with Eagle, but it doesn't look like you've actually laid out the PCB yet - those lines appear to be the "rat's nest" showing you what traces still need to be placed. You'd certainly want traces much wider than what's being shown, anyway. What's your power source? 17 LEDs in series ...
by jasonharper
Mon Jul 22, 2013 5:00 am
Forum: Assembly
Topic: Mechanical Kit + my electronics
Replies: 10
Views: 2155

Re: Mechanical Kit + my electronics

Those motors have 1/4" shafts; the Shapeoko normally uses motors with 5mm shafts. You would at the very least need to replace the X/Y axis pulleys, and the Z axis shaft coupler - around $16 of parts I think. The electronics appear to require a PC with a parallel port, which may or may not be a probl...
by jasonharper
Wed Jul 17, 2013 11:27 pm
Forum: GRBL
Topic: More Homing Issues
Replies: 9
Views: 1761

Re: More Homing Issues

normally closed [is] actually desirable from a safety standpoint [...], but grbl as of 0.8 doesn't support that. Does too. Wire them NC to +5 V with pull-down resistors (say 1 kohm) to GND. If you have both a min and a max switch on a given axis, wire them in series (not parallel as you'd have wire...
by jasonharper
Wed Jul 17, 2013 3:05 pm
Forum: GRBL
Topic: More Homing Issues
Replies: 9
Views: 1761

Re: More Homing Issues

Sounds like you've got your switches wired as normally closed, rather than normally open. That's actually desirable from a safety standpoint (a broken connection causes the system to fail immediately, rather than giving the illusion of protection), but grbl as of 0.8 doesn't support that. I expect t...
by jasonharper
Mon Jul 15, 2013 2:37 am
Forum: Electronics
Topic: Spindle-Enable
Replies: 5
Views: 1150

Re: Spindle-Enable

You really should switch the hot side of the extension cord, not the neutral. (Hot is the narrower prong, in the USA at least.)

For completeness I should add that you need a SSR with DC input and AC output, but that seems to be by far the most readily available type.