Search found 254 matches

by northbear
Mon Jul 30, 2012 7:48 pm
Forum: Electronics
Topic: Best electronic setup for newbie?
Replies: 10
Views: 25470

Re: Best electronic setup for newbie?

My main advice would be NEVER get the TB6560 driver from eBay/china, just buy something decent/dependable to start with and you will thank yourself in the future. Baz, I have been considering a TB6560 based driver from ebay and was wondering if you could give more detail on the exact board you used...
by northbear
Mon Jul 30, 2012 12:44 pm
Forum: Design Ideas
Topic: Rated torque on pulleys?? Why is there not a problem here?
Replies: 12
Views: 11494

Re: Rated torque on pulleys?? Why is there not a problem he

I was looking at the GT2 3mm pitch belt with the standard belt configuration. Idler touching backside (not touching the teeth)
belt.jpg
belt.jpg (44.23 KiB) Viewed 1008 times
Did I miss something?
by northbear
Mon Jul 30, 2012 2:41 am
Forum: Design Ideas
Topic: Some ideas...
Replies: 13
Views: 5898

Re: Some ideas...

Max Metz,

Thanks for sharing your design. Very cool!

If I may ask what you are planning on making that would use two stages?
by northbear
Fri Jul 27, 2012 10:02 pm
Forum: Design Ideas
Topic: Rated torque on pulleys?? Why is there not a problem here?
Replies: 12
Views: 11494

Re: Rated torque on pulleys?? Why is there not a problem he

Looks like the makerslide idler is slightly below the "recommended" pulled diameter. (.689 vs .75). Shouldn't make a difference.

http://www.sdp-si.com/D265/PDF/D265T056.pdf
999.PNG
999.PNG (61.2 KiB) Viewed 10299 times
by northbear
Fri Jul 27, 2012 7:43 pm
Forum: Electronics
Topic: Current limiting question.... (Cheap e-bay controllers)
Replies: 9
Views: 3770

Re: Current limiting question.... (Cheap e-bay controllers)

Improbable Construct wrote: I have run it pretty hard, maybe I will do some tests and see what happens if I push it to the limits.
Just be careful! I don't want you burning up a motor because of me! ;)
by northbear
Fri Jul 27, 2012 2:26 pm
Forum: Electronics
Topic: Current limiting question.... (Cheap e-bay controllers)
Replies: 9
Views: 3770

Re: Current limiting question.... (Cheap e-bay controllers)

lol! An attempt to flood. - The higher voltage applied, better is the torque, according to stepper max voltage. - Current is driven by coil characteristics, and driver limits it, where a pot is more convenient. Just 2 lines to sum-up, northbear! :D Sorry for the flood! :oops: I am not clear on one ...
by northbear
Fri Jul 27, 2012 1:31 pm
Forum: Electronics
Topic: Current limiting question.... (Cheap e-bay controllers)
Replies: 9
Views: 3770

Re: Current limiting question.... (Cheap e-bay controllers)

To show I am not just making stuff up (and for my own reference :mrgreen: ) below are a couple of links referencing current limiting for stepper motors http://www.pololu.com/catalog/product/1182 Current limiting To achieve high step rates, the motor supply is typically much higher than would be perm...
by northbear
Fri Jul 27, 2012 5:00 am
Forum: Electronics
Topic: Current limiting question.... (Cheap e-bay controllers)
Replies: 9
Views: 3770

Re: Current limiting question.... (Cheap e-bay controllers)

Have you ever had to drive your ShapeOKO extremely hard? I am wondering if you have never had to use the full torque of the motor? If not, maybe the driver was never trying to push full amps? Maybe you are right and the motors only take what they need? But this goes against the warnings to be sure t...
by northbear
Fri Jul 27, 2012 3:18 am
Forum: Electronics
Topic: Current limiting question.... (Cheap e-bay controllers)
Replies: 9
Views: 3770

Current limiting question.... (Cheap e-bay controllers)

From what I understand from reading here (http://www.shapeoko.com/wiki/index.php/Electronics#Pololu_A4988_Stepper_Drivers) as well as other places, you need to adjust the motor driver amps to be below to amp rating of the motor to protect the motor from overheating. So in theory you can drive a 3 am...
by northbear
Thu Jul 26, 2012 4:34 pm
Forum: Design Ideas
Topic: Are idler pulleys really needed or can we just use bearings?
Replies: 11
Views: 3983

Re: Are idler pulleys really needed or can we just use beari

Using washers would be problematic as they would touch both the inside and outside race of the bearing, stopping it from rotating, and the flange should be rotating rather then simply rubbing on the belt. One could use a flanged bearing, but they are more expensive. Below is an idea for making your ...