Search found 272 matches

by Hans
Fri Aug 14, 2015 7:08 pm
Forum: Software - CAD, CAM, Workflow Help
Topic: Great raster to vector service
Replies: 10
Views: 4363

Re: Great raster to vector service

That looks an awful lot like an advertisement. What's your connection to ivectorize?
by Hans
Fri Aug 14, 2015 12:27 pm
Forum: Shapeoko 3 Assembly
Topic: V wheel tightness
Replies: 11
Views: 2113

Re: V wheel tightness

I'm in agreement with Hans (in fact, he may be indirectly quoting the advice I've been giving for years). You got me in sleuthing mode. The earliest reference I found was http://www.shapeoko.com/wiki/index.php/Assembly_step_12#Steps_for_Silky_Smooth_Motion where user PLHS54 suggested the method in ...
by Hans
Thu Aug 13, 2015 8:44 pm
Forum: Shapeoko 3 Assembly
Topic: V wheel tightness
Replies: 11
Views: 2113

Re: V wheel tightness

You want them just barely tight enough that you can't spin the wheels in place with your fingers. That's been found to be an effective amount of preload. You might be able to do more than that, but the plastic will "set" in place after sitting for a while. The flat spot will rebound to its original ...
by Hans
Thu Aug 13, 2015 6:49 pm
Forum: Shapeoko 3 Assembly
Topic: 9mm belt hardware for X/Y axes
Replies: 10
Views: 1377

Re: 9mm belt hardware for X/Y axes

As long as we're doing armchair upgrades, does anybody know the mass of the X and Y axes? Whole gantry with tool, and just the X carriage? I'm wondering how much motor it would take to get real acceleration out of a S3. All I have to go on at the moment is twforeman's figures of 500 mm/s^2 and 35000...
by Hans
Fri Aug 07, 2015 3:38 am
Forum: Software - CAD, CAM, Workflow Help
Topic: Scan to toolpaths ideas
Replies: 14
Views: 1387

Re: Scan to toolpaths ideas

Chroma-key would work well for this. Get a piece of bright green or other bold color photo backdrop, and you can easily use a select color tool in photoshop or gimp to select just the green area. It's just like the green screen method they use for TV and movies. From there, smooth the edges with wha...
by Hans
Thu Aug 06, 2015 12:58 pm
Forum: Discussion
Topic: SO3 Z axis Upgrade discussion
Replies: 22
Views: 1639

Re: SO3 Z axis Upgrade discussion

A counterweight on a "real" machine is a gas spring. Not a damper, an air piston with pressure externally regulated to mostly counterbalance the weight of the machine's head. Then there are the brakes, which are usually built into the motor units. Of course all VMCs use a screw for linear motion. I'...
by Hans
Tue Aug 04, 2015 7:33 pm
Forum: Tooling & Fixtures
Topic: SO3 Machining Aluminum
Replies: 40
Views: 8250

Re: SO3 Machining Aluminum

With the long cycle times you get from taking small bites, you'd probably see a big difference in run time, finish, and tool life using large axial and short radial engagement with HSM toolpaths. Are people still using MakerCAM or whatever basic 2.5D for aluminum? At the very least, ramp instead of ...
by Hans
Fri Jul 31, 2015 5:39 pm
Forum: Discussion
Topic: Heat resistant but millable material?
Replies: 7
Views: 657

Re: Heat resistant but millable material?

Whatever you use, keep section thicknesses small and uniform. Quicker to heat up, less warping. At the high end of this sort of task, there are Auer boats (http://www.auerprecision.com/market/semiconductor) which are precision-stamped stainless steel and very thin. When I designed a frame for a semi...
by Hans
Fri Jul 31, 2015 3:15 pm
Forum: Discussion
Topic: Vac or planer ?
Replies: 65
Views: 3566

Re: Vac or planer ?

edwardrford wrote:Not exactly an answer to your question, just some semi-related side commentary.
I'd call that an answer. You got a planer, a jointer, and a vacuum all for less than OP's budget. It's a good suggestion!
by Hans
Fri Jul 31, 2015 1:00 pm
Forum: Discussion
Topic: Heat resistant but millable material?
Replies: 7
Views: 657

Re: Heat resistant but millable material?

Why not aluminum? It will lose its temper but strength is not an issue. Sure it's harder to machine, but it would look sweet.