Cable management strip
Cable Management Strip
Post by Rando » Wed Nov 22, 2017 4:12 pm
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Cable management strips are quite common in the industrial machine tool industry.
The only caution I would have is to ensure the track and the structure it sits upon are lightweight. Any additional mass attached to the gantry can theoretically impact the speed or accuracy of movement along that axis (my X, maybe your Y).
From my experience, cable tracks work best when the cables are flexible, thin, and relatively few. For instance, the Z-axis carriage on my machine includes various cables: a stepper-motor cable, spindle power, coolant in/out, under-spindle light power, static ground wire to the spindle body, chip-blower air tube, fume extraction air tube, and the mister's air and water tubes. This bundle can be around 3 inches in diameter when including the air (blow and exhaust) paths. As such, I prefer to hang these cables from above the machine to minimize the resulting weight on the flexible Z-axis. Just another way to handle the situation.
Cheers!
Thom
Indeed, you just need to figure out a way to mount the cable track so it has a supportive base. It is essential to ensure the track and its foundation are lightweight to prevent any negative impact on speed or accuracy of movement along your machine's axis.
Cable tracks are highly effective with flexible, thin cables that are few in number. For example, my Z-axis carriage comprises a stepper-motor cable, spindle power, coolant in/out, under-spindle light power, static ground wire to the spindle body, chip-blower air tube, fume extraction air tube, and mister’s air and water tubes. This bundle measures about 3 inches in diameter, including the two air paths. To reduce the weight on the flexible Z-axis, I hang these cables from above the machine. It's just an alternative method to deal with the issue.
Cheers, Thom
Drag Chain and Wire Gauge
Hey Ziggy,
You can find the definitions and wire sizes in American Wire Gauge, which offers a comparative chart for AWG to cross-sectional area.
As a quick reminder,
6 mm² corresponds to 9 AWG 5.3 mm² corresponds to 10 AWG 2.5 mm² corresponds to 13 AWG 1.5 mm² corresponds to 15 AWG 0.75 mm² corresponds to 18 AWG 0.5 mm² corresponds to 20 AWG
In engineering, wires are not measured by diameter but by cross-sectional area, as the cross-section is directly proportional to its strength and weight and inversely proportional to its resistance. The cross-sectional area also determines the maximum current a wire can carry safely. Wire diameter does not.
There is a useful comparison chart for American Wire Gauge to IEC 60228 in this file:
Comparison of SWG (red), AWG (blue), and IEC 60228 (black) wire gauge sizes from 0.03 to 200 mm² to scale on a 1 mm grid – in the SVG file, hover over a size to highlight it
With competitive prices and timely delivery, FSW sincerely hopes to be your supplier and partner.
Ziggy:
Also, is it the 60Hz from the AC or the noise from the router that is the problem?
60 Hz is EMI dirt and it is a high current. Since it is a 0.75 kW motor with 120 V, it draws 6.25 A AC. Control signals for the stepper motors are equally dirty and the currents are high, reaching up to 6 A, as stepper motors are driven by power electronics. There's nothing that shouldn't be shielded.
Ziggy:
Wouldn't it be simpler to shield the control cables?
You mean EMI will disturb stepper signals more than it will disturb router operation? However, shielding prevents EMI from affecting a cable and prevents EMI from emanating from a cable. Both the stepper signals and the router need shielding to avoid interference. Both carry dirty power signals, and it is uncertain what additional wires you may add to your drag chain in the future.
If you replace the router cable anyway, why use an unshielded cable? For cost? However, if EMI issues arise, they can be very challenging to diagnose. It's best to avoid them when possible.
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