unclesyd: Thanks for that link. Some of their lines of polyurethane wheels seem great, though I will have to contact them about giving me enough of a hub to attach a flange.
We are paying out 11/64-inch steel braided cable. I agree that a centerline shaft would be ideal for most situations...
Pat,
Thanks for your input. If heat dissipation does become a problem, might there be an alternative to PU, or maybe a specific type of PU you can recommend?
-Matt
Design goal is to support a 1,000lb spool of cable in horizontal fashion (rotating axis horizontal). Spool flanges (steel-lined) will be sitting on four rollers. Each roller will be lined with (or completely machined out of) a plastic selected to dissipate inertia of spool as the cable is...
BM: no source of CDA, so i'm stuck with sucking in ambient and pushing out hot ambient.
For those interested, we're going to end up with a combination of centrifugal fans on the inlet side and conventional axial fans on the exhaust, both pushing air through the EMI vents. I've got a call in...
CompositePro...you helped me before, and you've helped me again! Squirrel cage blowers seem to be a good solution. These can give a higher output pressures (compared to axial fans), but I wonder if I can get any data on how well they can overcome and inlet restriction, or are they the same thing?
Yes, those are the obvious choices.
Let me ask it a different way: Are there alternatives to conventional (axial) flow computer fans, and what are the trade-offs? I know of centrifugal fans, but I don't know the trade-offs. Any other way to circulate air?
Fair enough. The openings are not fixed in size as they would be with a hole-punched computer case. The EMI vents are made up of a thin walled honeycomb configuration with (I'm guessing) about a 95% open area, which poses no problem. The "dust screen" that caps the EMI vent is the problem...
Problem: I have a 20"x16"x7" box with some heat generating radio components inside. The aluminum box is sealed for EMI concerns, but the lack of heat exchange is causing the internal air temperature of the box to get too high, and the components are overheating and failing. As a modification...
I think I'm going to go with the Medium duty flange mount displayed here:
http://www.converteraccessory.com/products/shaft_support/ss214.html
Exellent recommendation. Now I've gotta figure out how I'm going to clamp the square shaft to the spool. Incidentally, it's a 2 foot dia cable spool...
YES! Composite pro, that's exactly what I'm looking for. I'm surfing around trying to find one of the "old style" ones you are referring to. If you manage to find one that can be mounted to a 1.5" shaft, please let me know. That square configuration sounds perfect.
@BobM3
Nice suggestion, though I'm a little concerned about the fragility of exposed magnets in this setting.
Thank you to all who have responded. I'm going to have to come up with a design solution by the end of the week, so (if ya'll care) I'll be posting the resolution next week.
@ israelkk
That might work, but all of the friction disk clutches I've seen have a housing that surrounds both the friction and mating disks, This means that I can't "drop in" the loaded shaft.
Keying the shafts is no big deal. But I still run into the problem of a) the spider or inset can be misplaced, b) I have zero axial movement available on the shafts.
I'm not trying to be difficult, NomLaser, and I really appreciate the suggestions.
NomLaser -
Correct: Neither the loaded nor the brake shaft will be moving until both are coupled together.
I've seen some of those spider coupling devices, but the problem with those is that the device can't be coupled unless there is some axial movement of one of the two shafts.
What I need...
Problem: Need to drop load-bearing shaft into a mechanism, and couple the load bearing shaft to a shaft with a brake (please see linked PDF). Zero torque, zero speed until shafts are coupled. Shafts are both approx. 1.5" dia. Transmitted torque = 600 in-lbs @ 100 rpm.
I need help with the...
