Search found 253 matches

by northbear
Wed Jan 27, 2016 9:56 pm
Forum: Build Logs
Topic: ShapeOko inspired CNC by Northbear
Replies: 19
Views: 9628

Re: ShapeOko inspired CNC by Northbear

Replaced the breakout board which went bad. More information here: http://www.shapeoko.com/forum/viewtopic.php?f=4&t=7499
by northbear
Wed Jan 27, 2016 9:52 pm
Forum: Electronics
Topic: Help debugging hardware gone bad!
Replies: 16
Views: 2470

Re: Help debugging hardware gone bad!

I replaced the breakout board last night and now it is back up and running! Hurray! But leads me to the question: Why did it fail? My current thoughts: 1) Cheap electronics. I purchased the first board off of e-bay direct from China (buyer "goodlucksell"). It was cheap, but once I received the board...
by northbear
Wed Jan 27, 2016 3:01 pm
Forum: For Sale
Topic: Shapeoko threaded table announced (again)
Replies: 28
Views: 3182

Re: Shapeoko threaded table announced (again)

If you can find a slab of aluminum that size w/ a guaranteed flatness spec, let us know your source. http://www.mcmaster.com/#86825k25/=10us8nh Additionally, while not a limitless supply, I've bought much bigger pieces of tooling plate (still with the plastic protective film on it) as scrap at my l...
by northbear
Tue Jan 19, 2016 10:54 pm
Forum: Electronics
Topic: Help debugging hardware gone bad!
Replies: 16
Views: 2470

Re: Help debugging hardware gone bad!

Find the Y that goes the wrong way, and measure the voltage on the direction output (with respect to ground) while executing a slow, long move in one direction, then while moving in the other direction. They should be very different (about 0 V and about 5 V), but I suspect they'll be the same, beca...
by northbear
Tue Jan 19, 2016 3:53 am
Forum: Electronics
Topic: Help debugging hardware gone bad!
Replies: 16
Views: 2470

Re: Help debugging hardware gone bad!

Thanks for the quick responses guys! AnonymousPerson - I could contact them but my CNC is not an official ShapeOKO, but instead a "Shapeoko inspired" design of my own. I know the guys at Carbide are helpful but I feel it may be asking a bit too much to help me debug my own machine :lol: WillAdams - ...
by northbear
Tue Jan 19, 2016 2:49 am
Forum: Electronics
Topic: Help debugging hardware gone bad!
Replies: 16
Views: 2470

Help debugging hardware gone bad!

Looking for some help on how to best debug what I believe is some piece of hardware that went bad. I was in the middle of running a job, and then the CNC simply stopped (with the spindle on, vacuum running, but no movement in any direction.). I stopped the program which should have turned off the sp...
by northbear
Wed Dec 16, 2015 3:28 pm
Forum: Discussion
Topic: Shapeoko Machine capabilities and limitations
Replies: 59
Views: 6020

Re: Shapeoko Machine capabilities and limitations

Now, let’s look at the belt properties. The Gates data sheet lists a 1” GT2 belt to have a modulus of 18,000, and specifies proportional reduction for smaller sizes with a further 10% between ¼” and ½”. That means the 18,000 modulus becomes 4,050. To combat this, one could increase the width of the...
by northbear
Mon Oct 26, 2015 2:48 am
Forum: Discussion
Topic: Detensioning - For times when not in use?
Replies: 2
Views: 584

Re: Detensioning - For times when not in use?

I think the flat spot on the v-wheels was me (or at least I had that problem at one point). I found the issue was due to my adjusting the eccentric cams on the v-wheels so that it was too tight. Evern since I did that I have not noticed any issues. But I do place a block under the z-axis to release ...
by northbear
Tue Oct 20, 2015 3:01 pm
Forum: Lounge
Topic: Calculating stresses on a frame
Replies: 5
Views: 778

Re: Calculating stresses on a frame

You could also look into a course on mechanics of materials, specifically a section on statics seems like what you are most interested in.

I apologize, but I don't know of any online courses to suggest :(
by northbear
Fri May 22, 2015 2:18 am
Forum: Lounge
Topic: MSP Maker faire - Anyone going and why are there two?
Replies: 1
Views: 370

MSP Maker faire - Anyone going and why are there two?

Just found out that there are two maker fairs this coming up the next two weekends in the Minneapolis - St. Paul area. One put on by the TC Maker - http://www.tcmaker.org/blog/2015/05/minne-faire-6-approaches-quickly/ and one by Make Magazine - http://makerfairemsp.com/ Not sure why they are separat...