I am looking for a detachable battery pack case that will easily clip or snap onto an OEM holder that is mounted to the bottom of a kinetic art piece. Something like a battery pack attaching to a portable drill would be perfect. But to do so, I need to find the mating hardware to attach to the...
Does anyone know where I can buy stock constant force springs with 1 to 4 lb-in of torque and about 120 inches in length? I am looking for companies besides Stock Drive Products and McMaster-Carr. I only need about 5-10 springs, so it is too expensive to have a company like Vulcan Spring make...
thanks diskullman.
I see on Boca's web site 2 possible 608 bearings:Ultra Seal or Ceramic Premium. Do you have a recommedation for a bearing with the least amount of friction at 5-8 rpm?
I have ordered some self-aligning bearings and may use in pairs to avoid wobble. But the doubling of the bearing will negate my friction savings, so we shall see. I have also ordered a 6 ball bearing - one less ball than all the other skateboard bearings I have tried. I have heard from some...
The ceramic bearing that I am curretly using has a removable nylon cage. It seems to me that the cage itself imparts friction since it snaps in and seperates the balls and inhibits the balls from freely rotating. If I'm correct is there any way to avoid this? Do I need a cage?
Also, the...
Thanks for the pointers, caoimhin1
You recommend without shields with light oil. I assume that shields add drag? Also, do have any thoughts on using a self aligning bearing. Will the double row of bearing balls add or reduce friction?
I have heard from several people that an ABEC rating does not imply a degree of friction. I have tried bearings with ABEC 7 ratings that are less 'free wheeling' than a ABEC 3 bearing. Both bearings were without oil or grease. I understand that the ABEC rating simply defines the tolerances of...
The skateboard bearing is not ABEC rated. I am not experienced enough to give you a starting or running torque requirement. My application is basically a 36" diameter, 3/8" thick wooden wheel that is recieves about a 2 second pulse force from a 1 lb-in torque constant force spring. The spring...
Does anyone know where I can find a relatively inexpensive ulta-low friction ball bearing with 5/16" bore. My application demands really low friction under 10 rpm, room temperature environment. I have tried a skateboard bearing called Bones, Swiss Ceramic @ $15.00 each. The bearing is ok but...
Does anyone know where I can find a relatively inexpensive ulta-low friction ball bearing with 5/16" bore. My application demands really low friction under 10 rpm, room temperature environment. i have tried a skateboard bearing called Bones, Swiss Ceramic @ $15.00 each. The bearing is ok but...
I am using a 0.6 in-lb constant force spring in a spring motor assembly. I have heard that constant force springs should always have at least 1-2 turns on both the storage and output spools. Is that true for small springs? If I were to attach the ends of the spring with a single screw to the...
